Kendo UI开发教程(12): Kendo MVVM 数据绑定(一) attr

痛定思痛。 2023-10-16 19:23 55阅读 0赞

Kendo UI MVVM数据绑定支持的绑定属性有 attr, checked, click, custom , disabled,enabled, events, html, invisible, , style, text ,value, visible ，这些属性可以绑定到DOM元素或是Kendo UI组件的属性。本篇介绍 attr 绑定。  
attr 支持把ViewModel的属性或方法绑定到DOM元素的某个属性， 比如设置hyperlink 的herf 和title属性， image元素的 src 或 alt 属性。 其基本用法为  
attr: \{ attribute1: field1, attribute2: field2 \}  
其中 attribute1 和 attribute2 为DOM元素的属性名称， 而 field1,field2为ViewModel对象的值域（属性）的名称。  
比如：

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">1</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">&lt;</code><code style="">img</code>&nbsp;<code style="">id</code><code style="">=</code><code style="">"logo"</code>&nbsp;<code style="">data-bind</code><code style="">=</code><code style="">"attr: { src: imageSource, alt: imageAlt }"</code>&nbsp;<code style="">/&gt;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">2</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">&lt;</code><code style="">script</code><code style="">&gt;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">3</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">var viewModel = kendo.observable({ </code></td> 
  </tr> 
 </tbody> 
</table>

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">4</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="">imageSource: "http://www.kendoui.com/image/kendo-logo.png",</code></td> 
  </tr> 
 </tbody> 
</table>

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">5</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="">imageAlt: "Kendo Logo"</code></td> 
  </tr> 
 </tbody> 
</table>

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">8</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">kendo.bind($("#logo"), viewModel);</code></td> 
  </tr> 
 </tbody> 
</table>

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">9</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">&lt;/</code><code style="">script</code><code style="">&gt;</code></td> 
  </tr> 
 </tbody> 
</table>

在本例中，image元素的 src和 alt属性被绑定到viewModel对象的 imageSource和 imageAlt属性。 当调用kendo.bind方法，image元素和下面HTML元素等效：

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">1</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">&lt;</code><code style="">img</code>&nbsp;<code style="">id</code><code style="">=</code><code style="">"logo"</code>&nbsp;<code style="">src</code><code style="">=</code><code style="">"http://www.kendoui.com/image/kendo-logo.png"</code><code style="">alt</code><code style="">=</code><code style="">"Kendo Logo"</code><code style="">" /&gt;</code></td> 
  </tr> 
 </tbody> 
</table>

此时，如果修改viewModel的imageSource和 imageAlt属性的值，页面上显示的图片也随之发生变化。

[![20130817001][]][20130817001]

注意：如果需要绑定到DOM元素的value或checked属性，你需要使用Kendo MVVM的 value和 checked绑定方法。

attr 绑定也支持设置HTML5 数据属性绑定，例如：

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">1</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">&lt;</code><code style="">div</code>&nbsp;<code style="">data-bind</code><code style="">=</code><code style="">"attr: { data-foo: fooValue, data-bar: barValue }"</code><code style="">&gt;&lt;/</code><code style="">div</code><code style="">&gt;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">3</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">&lt;</code><code style="">script</code><code style="">&gt;</code></td> 
  </tr> 
 </tbody> 
</table>

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">4</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">var viewModel = kendo.observable({ </code></td> 
  </tr> 
 </tbody> 
</table>

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">5</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">&nbsp;&nbsp;&nbsp;&nbsp;</code><code style="">fooValue: "foo",</code></td> 
  </tr> 
 </tbody> 
</table>

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">9</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">kendo.bind($("div"), viewModel);</code></td> 
  </tr> 
 </tbody> 
</table>

<table style=""> 
 <tbody style=""> 
  <tr style=""> 
   <td style=""><code style="">10</code></td> 
   <td style="border-width:0px 0px 0px 3px!important; margin:0px!important; padding:0px 0px 0px 0.5em!important; outline:0px!important; left:auto!important; top:auto!important; width:auto!important; height:auto!important; right:auto!important; bottom:auto!important; color:rgb(185,189,182)!important; line-height:1.1em!important; font-family:Consolas,'Bitstream Vera Sans Mono','Courier New',Courier,monospace!important; font-size:1em!important; font-variant:inherit; vertical-align:top!important; border-left-color:rgb(67,90,95)!important; border-left-style:solid!important; float:none!important; position:static!important; direction:ltr!important"> <code style="">&lt;/</code><code style="">script</code><code style="">&gt;</code></td> 
  </tr> 
 </tbody> 
</table>

[20130817001]: http://www.imobilebbs.com/wordpress/wp-content/uploads/2013/08/20130817001.png