干货！一步步实现自己的表单验证器

- 日理万妓 2022-08-07 15:50 135阅读 0赞

表单验证的需求简直太常见了。“所有用户的输入都是不可信的”这个思想指导我们在设计表单的时候，一定要进行用户输入的验证。对于用户体验而言，越早的反馈则越佳，所以表单验证的工作应该尽可能地在前端就进行（当然，前端对于后端而言也是输入端，所以后端仍然需要进行检验）。简单的表单验证完全可以给input绑定几个change事件来进行。但表单一复杂，或者相似验证规则一多，这种编码的方式就很难管理事件了。这时候，我们通常需要使用一些库来帮助我们处理表单验证的工作。前端表单验证的库太多了，随便一搜：[表单验证-百度搜索][-]。

那……为什么还要自己实现一个呢？因为去年工作中遇到了比较复杂的验证逻辑，选一个别人的库一是要学习api，二是维护起来困难，要符合自己的页面风格也不是那么轻松；再加上表单验证器并不复杂，于是就打算自己写一个。所以这个表单验证器并不算那么地通用，不过我觉得传播思路和方法更重要，要想修修改改变成一个通用的库也很容易，只是没那么重要罢了（其实是懒……）。

## 依赖 ##

jquery + bootstrap。jquery看来是缺不了，bootstrap没那么重要，对代码稍做修改就可以取消依赖。

## 能做什么 ##

我期望这个表单验证器直接在html代码中指定好需要采用什么样的规则，不需要用javascript进行多余的配置；允许暂时跳过验证；允许扩展验证规则；提供验证难过、验证失败、警告三种验证结果；允许手动触发验证等等。

一个典型的bootstrap风格的表单项应该长这个样子：

XHTML

重点看第5行，对于一个普通的input组件，我加了两个属性， data-validate-disable 有值表示表单验证时，会跳过这个input组件； data-validate 则存放如果要验证的话，将采用什么样的验证规则。这个例子中表示要验证这个input组件是否为空、是否为手机号码这两个规则。注意，在request 的后面我还加了一点内容，这是我想传递给验证规则的参数，比如这里我期望告诉验证器，如果input值只有空格，也认为是有值的。相似的，我们可以定义一个规则 min 来处理最少几个字符，并在html中把这个设定值传递进来，就像这样： data-validate="min:10" 。我也期望一个验证规则允许多个参数传递，参数与参数之间用逗号隔开。

看起来很有意思，那就开始动手吧。

## 先写个jquery插件吧 ##

JavaScript

给jquery对象添加一个 validation 方法，用法很简单： $(Selector).validation() 。支持链式调用。Selector比较自由，如果是 :input 元素，则直接给这些元素初始化验证器；否则找出它们所有的 :input 子元素，给这些子元素初始化验证器。什么意思呢？就以上面的html片断为例，你可以任性地使用如下任意一种方式初始化验证器：

*  $('\[name=mobile\]').validation(); // 选择:input 
 *  $('.form-group').validation(); // 选择普通节点，对所有:input子元素生效 
 *  $('body').validation(); // 对页面中所有的:input元素生效

再说说所谓的初始化，其实就是绑定事件。那么要绑定什么事件呢？主观上，对于一个输入框，当我们输入好了，焦点离开时，应该就进行输入内容的验证，并给出验证结果。如果验证失败，会有提示信息，但这些提示信息应该在重新获得焦点时清除，否则当用户在修正输入的时候还一直提示上次的错误信息，会让用户无所适从。那么针对以上的情况，我们需要在失去焦点（blur）和获得焦点（focus）时分别绑定验证的方法（validate）和清除错误信息的方法（clear）。另外针对checkbox、radiobox、select等控件，最好也给select事件绑定验证方法。

> 为什么不使用更通用change事件来绑定验证方法呢？原因有二：
> 
> 1.  我觉得有些场景需要用javascript载入默认值或历史输入。这些内容应该延后验证（不是不验证），不然刚打开页面就是表单验证错误让人很难受。所以change事件不合适。
> 2.  由于获得焦点会清空错误消息，如果没有修改内容，直接失去焦点，这时不会触发change事件，导致不会再验证，表现为错误信息丢失。

那下面就来具体看看validate和clear两个方法。

## 清除错误消息及验证状态设置 ##

JavaScript

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      <span style="font-family:inherit;color:#06fe0;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;"> </span> 
      <span style="font-family:inherit;color:#48a9ae;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">=</span> 
      <span style="font-family:inherit;color:#06fe0;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;"> </span> 
      <span style="font-family:inherit;color:#6687b7;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">this</span> 
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      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">.</span> 
      <span style="font-family:inherit;color:#e3ae3a;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">removeClass</span> 
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      <span style="font-family:inherit;color:#06fe0;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;"> </span> 
      <span style="font-family:inherit;color:#48a9ae;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">=</span> 
      <span style="font-family:inherit;color:#06fe0;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;"> </span> 
      <span style="font-family:inherit;color:#6687b7;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">this</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">.</span> 
      <span style="font-family:inherit;color:#e3ae3a;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">closest</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">(</span> 
      <span style="font-family:inherit;color:#839a31;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">'.form-group'</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">)</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">;</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; vertical-align: baseline; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(249, 249, 249) !important;"> 
      <span style="font-family:inherit;color:#06fe0;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">$</span> 
      <span style="font-family:inherit;color:#6687b7;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">parent</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">.</span> 
      <span style="font-family:inherit;color:#e3ae3a;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">removeClass</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">(</span> 
      <span style="font-family:inherit;color:#839a31;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">'waiting'</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">)</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">.</span> 
      <span style="font-family:inherit;color:#e3ae3a;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">addClass</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">(</span> 
      <span style="font-family:inherit;color:#839a31;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">'has-warning'</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">)</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">.</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; vertical-align: baseline; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: 0px 50%;"> 
      <span style="font-family:inherit;color:#06fe0;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit;color:#e3ae3a;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">attr</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">(</span> 
      <span style="font-family:inherit;color:#839a31;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">'data-for'</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">,</span> 
      <span style="font-family:inherit;color:#06fe0;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;"> </span> 
      <span style="font-family:inherit;color:#6687b7;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">this</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">.</span> 
      <span style="font-family:inherit;color:#e3ae3a;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">prop</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">(</span> 
      <span style="font-family:inherit;color:#839a31;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">'name'</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">)</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">)</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">.</span> 
      <span style="font-family:inherit;color:#e3ae3a;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">find</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">(</span> 
      <span style="font-family:inherit;color:#839a31;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">'.help-block'</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">)</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">.</span> 
      <span style="font-family:inherit;color:#e3ae3a;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">text</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">(</span> 
      <span style="font-family:inherit;color:#d73c3b;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">msg</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">)</span> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">;</span> 
     </div> 
     <div style="margin: 0px; padding: 0px 5px; border: 0px; vertical-align: baseline; font-family: inherit; height: inherit; word-break: break-all; font-size: inherit !important; line-height: inherit !important; font-weight: inherit !important; white-space: pre-wrap !important; background: rgb(249, 249, 249) !important;"> 
      <span style="font-family:inherit;color:#dd0000;margin: 0px; padding: 0px; border: 0px; font-size: inherit !important; vertical-align: baseline; height: inherit; line-height: inherit !important; font-weight: inherit !important;">}</span> 
     </div> 
    </div></td> 
  </tr> 
 </tbody> 
</table>

这一段一起说，因为这部分内容是dom操作相关的，与bootstrap强相关，如果你不用bootstrap，那就尽情地替换掉吧（估计改几个类名就行了）。这几个函数的用途从名字上就可以看出。clear上面已经提到过，清空验证信息；另外三个分别处理验证通过、验证失败和警告时的信息展示。简单是简单，但这里有两个问题需要额外考虑一下。

第一个是验证信息优先级的问题：

一个输入项可能同时有多个验证规则要匹配，可能有些验证规则通过，有些失败，有些警告。在具体处理时，我觉得比较合理的流程是：如果出现验证失败，则立刻停止后续验证，直接提示错误信息；如果警告，则提示警告信息，并继续后续规则验证；如果验证成功，理论上不需要做任何处理，直接进行下一步验证，但谨慎起见，还是做一下清空错误信息的工作，但要注意不可以清空掉警告信息（错误信息不用管，因为一产生错误信息，验证也就停止了，不会再触发验证成功了）。

另一个问题是同一个表单单元中有多个输入控件的问题，就像这样：

![QQ20150415121912][]

几个控件共用了一个错误信息展示文本，我觉得如果某一个控件输入内容有误，必须再次修改这个控件内容才能清空错误信息，修改别的控件时，这个错误信息应该保留。所以在清除错误信息时，我们额外需要知道这个错误信息是由哪个控件引起的。在上面的示例中，我们在处理验证错误和警告时，把引起问题的控件的name记录到表单单元的data-for属性中了。到需要清空的时候再比对一下data-for和当前控件的name是不是一致，不一致就不清空错误信息。

## 处理验证流程 ##

我们给输入控件的blur和select事件绑定了validate方法，那么这个validate方法如何实现呢？

JavaScript

<table style="margin-left:0px; font-size:0.857142857rem; vertical-align:baseline; color:rgb(117,117,117); line-height:2; margin-top:0px!important; margin-right:0px!important; margin-bottom:0px!important; padding:0px!important; border:none!important; border-collapse:collapse!important; border-spacing:0px!important; width:auto!important; table-layout:auto!important; background:none!important"> 
 <tbody style="margin:0px; padding:0px; border:0px; font-size:12px; vertical-align:baseline"> 
  <tr style="margin:0px!important; padding:0px!important; border:none!important; vertical-align:top!important; background:0px 50%"> 
   <td style="border-top-width:0px; border-bottom-width:0px; border-left-width:0px; margin:0px!important; padding:0px!important; border-right-width:1px!important; vertical-align:top!important; font-family:Monaco,MonacoRegular,'Courier New',monospace!important; color:rgb(181,181,181)!important; background:rgb(240,240,240)!important"> 
    <div style="margin:0px; padding:0px; border:0px; vertical-align:baseline; white-space:nowrap; line-height:18px!important; background:0px 50%"> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; height:18px; line-height:inherit!important; font-weight:inherit!important; background:0px 50%">
       1 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(151,151,151)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(226,226,226)!important">
       2 
     </div> 
     <div style="margin:0px; padding:0px 5px; border-width:1px!important; border-top-style:solid!important; border-color:rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(129,129,129)!important; height:19px; line-height:inherit!important; font-weight:inherit!important; background:rgb(209,209,209)!important">
       3 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:1px rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(98,98,98)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(192,192,192)!important">
       4 
     </div> 
     <div style="margin:0px; padding:0px 5px; border-width:1px!important; border-bottom-style:solid!important; border-color:rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(129,129,129)!important; height:19px; line-height:inherit!important; font-weight:inherit!important; background:rgb(209,209,209)!important">
       5 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(151,151,151)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(226,226,226)!important">
       6 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; height:18px; line-height:inherit!important; font-weight:inherit!important; background:0px 50%">
       7 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(151,151,151)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(226,226,226)!important">
       8 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; height:18px; line-height:inherit!important; font-weight:inherit!important; background:0px 50%">
       9 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(151,151,151)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(226,226,226)!important">
       10 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; height:18px; line-height:inherit!important; font-weight:inherit!important; background:0px 50%">
       11 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(151,151,151)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(226,226,226)!important">
       12 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; height:18px; line-height:inherit!important; font-weight:inherit!important; background:0px 50%">
       13 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(151,151,151)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(226,226,226)!important">
       14 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; height:18px; line-height:inherit!important; font-weight:inherit!important; background:0px 50%">
       15 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(151,151,151)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(226,226,226)!important">
       16 
     </div> 
     <div style="margin:0px; padding:0px 5px; border-width:1px!important; border-top-style:solid!important; border-bottom-style:solid!important; border-color:rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(129,129,129)!important; height:20px; line-height:inherit!important; font-weight:inherit!important; background:rgb(209,209,209)!important">
       17 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(151,151,151)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(226,226,226)!important">
       18 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; height:18px; line-height:inherit!important; font-weight:inherit!important; background:0px 50%">
       19 
     </div> 
     <div style="margin:0px; padding:0px 5px; border-width:1px!important; border-top-style:solid!important; border-color:rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(98,98,98)!important; height:19px; line-height:inherit!important; font-weight:inherit!important; background:rgb(192,192,192)!important">
       20 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:1px rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(129,129,129)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(209,209,209)!important">
       21 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:1px rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(98,98,98)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(192,192,192)!important">
       22 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:1px rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(129,129,129)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(209,209,209)!important">
       23 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:1px rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(98,98,98)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(192,192,192)!important">
       24 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:1px rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(129,129,129)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(209,209,209)!important">
       25 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:1px rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(98,98,98)!important; height:36px; line-height:inherit!important; font-weight:inherit!important; background:rgb(192,192,192)!important">
       26 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:1px rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(129,129,129)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(209,209,209)!important">
       27 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:1px rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(98,98,98)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(192,192,192)!important">
       28 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:1px rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(129,129,129)!important; height:18px; line-height:inherit!important; font-weight:inherit!important; background:rgb(209,209,209)!important">
       29 
     </div> 
     <div style="margin:0px; padding:0px 5px; border-width:1px!important; border-bottom-style:solid!important; border-color:rgb(172,172,172)!important; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; color:rgb(98,98,98)!important; height:19px; line-height:inherit!important; font-weight:inherit!important; background:rgb(192,192,192)!important">
       30 
     </div> 
     <div style="margin:0px; padding:0px 5px; border:0px; font-size:inherit!important; vertical-align:baseline; font-family:inherit; text-align:center; height:18px; line-height:inherit!important; font-weight:inherit!important; background:0px 50%">
       31 
     </div> 
    </div> </td> 
   <td style="border:0px; width:598px; margin:0px!important; padding:0px!important; vertical-align:top!important; font-family:Monaco,MonacoRegular,'Courier New',monospace!important; background:0px 50%"> 
    <div style="margin:0px; padding:0px; vertical-align:baseline; color:rgb(0,0,0); white-space:pre; overflow:visible; border:none!important; line-height:18px!important; background:none!important"> 
     <div style="margin:0px; padding:0px 5px; border:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:0px 50%"> 
      <span style="font-family:inherit; color:#9d72b2; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">function</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#e3ae3a; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">validate</span> 
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      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">{ </span> 
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      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; color:#9d72b2; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">var</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">$</span> 
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      <span style="font-family:inherit; color:#48a9ae; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">=</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">$</span> 
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      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">;</span> 
     </div> 
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      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; color:#9d72b2; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">var</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#d73c3b; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">success</span> 
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      <span style="font-family:inherit; color:#48a9ae; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">=</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#6687b7; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">new</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">$</span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">.</span> 
      <span style="font-family:inherit; color:#e3ae3a; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">Callbacks</span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">(</span> 
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      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">;</span> 
     </div> 
     <div style="margin:0px; padding:0px 5px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; border:1px rgb(233,229,121)!important; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:rgb(250,248,209)!important"> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; color:#9d72b2; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">var</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#d73c3b; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">fail</span> 
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      <span style="font-family:inherit; color:#48a9ae; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">=</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#6687b7; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">new</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">$</span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">.</span> 
      <span style="font-family:inherit; color:#e3ae3a; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">Callbacks</span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">(</span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">)</span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">;</span> 
     </div> 
     <div style="margin:0px; padding:0px 5px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; border-width:1px!important; border-bottom-style:solid!important; border-color:rgb(233,229,121)!important; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:rgb(255,254,226)!important"> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; color:#9d72b2; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">var</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#d73c3b; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">warning</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#48a9ae; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">=</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#6687b7; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">new</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">$</span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">.</span> 
      <span style="font-family:inherit; color:#e3ae3a; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">Callbacks</span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">(</span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">)</span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">;</span> 
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      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; color:#9d72b2; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">var</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
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      <span style="font-family:inherit; color:#6687b7; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">parent</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#48a9ae; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">=</span> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important"></span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">$</span> 
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      <span style="font-family:inherit; color:#e3ae3a; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">closest</span> 
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      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">;</span> 
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     <div style="margin:0px; padding:0px 5px; border:0px; vertical-align:baseline; font-family:inherit; height:inherit; word-break:break-all; font-size:inherit!important; line-height:inherit!important; font-weight:inherit!important; white-space:pre-wrap!important; background:0px 50%"> 
      <span style="font-family:inherit; color:#06fe0; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">&nbsp;&nbsp;&nbsp;&nbsp;</span> 
      <span style="font-family:inherit; color:#d73c3b; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">success</span> 
      <span style="font-family:inherit; color:#dd0000; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">.</span> 
      <span style="font-family:inherit; color:#e3ae3a; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">add</span> 
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      <span style="font-family:inherit; color:#9d72b2; margin:0px; padding:0px; border:0px; font-size:inherit!important; vertical-align:baseline; height:inherit; line-height:inherit!important; font-weight:inherit!important">function</span> 
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 </tbody> 
</table>

先看这段代码的前一部分，我定义了三个$.Callbacks对象，分别用以处理不同验证结果的响应。从效果上，不用$.Callbacks对象，直接传递函数引用也是可行的，我是想把dom操作和验证逻辑分离开，用类似事件触发的异步形式来处理验证逻辑。

再看第17行，它规定了两种情形不执行验证，一种是控件被禁用，另一种是控件中存在data-validate-disable属性。这个不用多解释了。

重点看20~30行，这段是关键。第21行中，我们把data-validate中的内容按空白（空格、tab、换行）切割到一个数组conditions中，conditions中的每一项都是一条需要验证的规则。那么很自然地，遍历这个数组。再看第26行，引入了一个新的方法pickStrategy，很明显它是对这条规则进行验证。先别管它的实现，看看它接收的参数。还记得前面我们说要允许用 rule:param1,param2 的形式给验证规则传入参数吗？pickStrategy拿到的第一个参数就是 \[rule, param1, param2\] ，通过condition.spit(/\[:,\]/g) 解析出。第二个参数是当前处理的控件的jquery对象，后面三个分别是验证成功、失败、警告三种情形的回调对象。如果验证失败，pickStrategy应该返回 false ，同时中止验证，否则验证下一条规则。

## 策略模式 ##

下面就要来说pickStrategy方法了，不过先要补充一点背景知识——策略模式。策略模式是一种设计模式。

设计模式是搞软件工程的人常常挂在嘴边的词汇，表示对设计的复用。当然前端开发在工程化的进程上每家公司情况各异，我估计绝大多数公司的前端开发并不考虑工程上的问题，只考虑完成需求。因而对于没有OO编程开发背景的前端开发而言，设计模式可能是陌生的，甚至程序设计（别紧张，没有在说程序编写）本身就是陌生的。由于工程化的忽略和javascript语言本身的优点（很多模式没必要实现）和缺点（很多模式无法实现），前端开发中很少提设计模式。那么前端开发者怎么理解设计模式呢？设计模式就是一系统问题（场景）的通用解决思路。比如有人觉得jquery的链式调用很好用，能很大程度降低工作量，于是在别的地方也用函数 return this; 的方式构造支持链式调用的函数，这就可以认为是一个模式（谈不上设计模式）。

那策略模式是为了解决什么问题，或应对什么场景的呢？如果干一件事、完成一个任务可以有不同的策略，不同的算法来完成，这些策略、算法应该具有相同的输入和输出，但可以使用不同的资源（即不care中间实现差异）。具体要采用什么策略和方法则在程序运行时依据条件选择。举个例子？

![QQ20150415155218][]

压缩文件，你可以选择不同的算法，但它们拥有相同的输入和输出。

那么我们做表单验证跟策略模式有什么关系呢？我们完全可以把每个验证规则看作是一个策略，我们支持的所有的策略放在一起，取个高大上的名字叫“策略池”。当我们想验证一个规则的时候，只需要去策略池中取出这个策略跑一下，不需要在一个很大的函数里面跑一堆if…else，或者switch…case。另外如果有新的规则加进来，只要把它塞到策略池中，无需更改已有的代码，实现验证规则和验证流程解耦。

先实现一个策略池吧：

JavaScript

太棒了，一句代码就完事了，爱死javascript了！

再回到pickStrategy方法，看看怎么从这个策略池中拿到我们需要的验证规则：

JavaScript

先说这个token，还记得它是什么吗？如果要验证的规则是“min:5”，那么token就是 \['min','5'\] 这个数组。第2行取出这个数组的第一项 'min' ，再从策略池中取出这个验证规则。如果没有这个规则，则跳过这次验证，认为此次通过；如果有这个规则，则执行这个规则（见第5行），需要注意一下第5行的token已经发生变化了，除去规则名称，只剩下参数了，延续前面的例子，这里token应该是 \['5'\] 。

现在我们的策略池是空的，那可不行，先试着写一个验证“min”规则的方法吧：

JavaScript

这个方法内，this指向当前验证的控件的jquery对象，第1个参数是额外带给验证规则的参数；第2个参数是验证成功的回调，使用时需要配合 return true; （见9、10行）；第3个参数是验证失败的回调，使用是需要配合 return false; （见13、14行）；第4个参数是警告的回调，需要配合 returntrue; ，这个验证中没用到。

起始的几个验证方法也可以直接写在策略池中，我写了几个，供大家参考（代码比较长，展开需谨慎。不想展开？你可能要错过身份证验证、邮箱验证、url验证等一堆干货了！）：

点击展开代码

## 添加验证规则 ##

说好的支持自定义验证规则呢？放心，不会少的，而且超简单：

JavaScript

加个静态方法搞定。

## 手动发起验证 ##

有些场景下需要手动check一下表单内容才放心吧：

JavaScript

原理很简单，对:input子元素触发一次blur事件。

## 还有一些是我没有做的 ##

都不是很复杂，因为我的业务场景不关注这些，所以就懒过去了。

1.  没做通用的ajax验证  
    现在对于ajax的验证，可以这样做：  
    
    
    JavaScript
    
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         </div> 
        </div> </td> 
      </tr> 
     </tbody> 
    </table>
    
      
     表单提交前，除了检查有没有.has-error的元素找到填写出错项，还要检查有没有.wait元素，如果有的话都不能立刻提交。  
    如果要有一个通用的ajax验证机制，可以自行扩展$.validation方法
2.  没做验证失败时表单提交阻断  
    正如上一条中说的，表单提交前，需要检查.has-error和.wait元素，可以自行扩展$.fn.validation方法，添加form的submit事件绑定。
3.  没有为handle验证状态的dom操作提供接口  
    不想做，bootstrap挺好的。
4.  没有测试用例  
    不打算给这些代码添加逻辑了，不想写测试用例。
    
    ## 下载 ##
    
    [validation.js][]
    
    转载自：[http://www.zhouhua.info/2015/04/15/validation/][http_www.zhouhua.info_2015_04_15_validation]

[-]: http://www.zhouhua.info/jump/z000
[QQ20150415121912]: http://zhouhua.qiniudn.com//wp-content/uploads/2015/04/QQ20150415121912.png
[QQ20150415155218]: http://zhouhua.qiniudn.com//wp-content/uploads/2015/04/QQ20150415155218.png
[validation.js]: http://zhouhua.qiniudn.com//wp-content/uploads/2015/04/validation.js
[http_www.zhouhua.info_2015_04_15_validation]: http://www.zhouhua.info/2015/04/15/validation/