如何在AngularJs中使用ng-repeat进行词典？

绝地灬酷狼 2022-11-29 05:42 31阅读 0赞

本文翻译自：[How to use ng-repeat for dictionaries in AngularJs?][How to use ng-repeat for dictionaries in AngularJs]

*I know that we can easily use ng-repeat for json objects or arrays like:* **我知道我们可以轻松地对json对象或数组使用*ng-repeat* ，如：**

*but how can we use the ng-repeat for dictionaries, for example:* **但是我们如何才能将ng-repeat用于词典，例如：**

var users = null;
    users["182982"] = "{...json-object...}";
    users["198784"] = "{...json-object...}";
    users["119827"] = "{...json-object...}";

*I want to use that with users dictionary:* **我想用用户词典：**

*Is it possible?.* **可能吗？。** *If yes, how can I do it in AngularJs?* **如果是，我怎么能在AngularJs中做到这一点？**

*Example for my question: In C\# we define dictionaries like:* **我的问题示例：在C＃中我们定义了如下字典：**

Dictionary<key,value> dict = new Dictionary<key,value>();
    
    //and then we can search for values, without knowing the keys
    foreach(var val in dict.Values)
    {
    }

*Is there a build-in function that returns the values from a dictionary like in c\#?* **是否有内置函数从c＃中返回字典中的值？**

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### \#1楼 ###

参考：[https://stackoom.com/question/Oi4n/如何在AngularJs中使用ng-repeat进行词典][https_stackoom.com_question_Oi4n_AngularJs_ng-repeat]

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### \#2楼 ###

*You can use* **您可以使用**

*See [ngRepeat documentation][] .* **请参阅[ngRepeat文档][ngRepeat documentation] 。** *Example: [http://jsfiddle.net/WRtqV/1/][http_jsfiddle.net_WRtqV_1]* **示例： [http][http_jsfiddle.net_WRtqV_1] ： [//jsfiddle.net/WRtqV/1/][http_jsfiddle.net_WRtqV_1]**

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### \#3楼 ###

*JavaScript developers tend to refer to the above data-structure as either an object or hash instead of a Dictionary.* **JavaScript开发人员倾向于将上述数据结构称为对象或哈希而不是字典。**

*Your syntax above is wrong as you are initializing the `users` object as null.* **当您将`users`对象初始化为null时，上面的语法是错误的。** *I presume this is a typo, as the code should read:* **我认为这是一个拼写错误，因为代码应该是：**

// Initialize users as a new hash.
    var users = {};
    users["182982"] = "...";

*To retrieve all the values from a hash, you need to iterate over it using a for loop:* **要从哈希中检索所有值，您需要使用for循环迭代它：**

*If you plan on doing a lot of work with data-structures in JavaScript then the [underscore.js][] library is definitely worth a look.* **如果您计划在JavaScript中使用数据结构进行大量工作，那么[下划线.js][underscore.js]库绝对值得一看。** *Underscore comes with a [`values` method][values_ method] which will perform the above task for you:* **Underscore附带一个[`values`方法][values_ method] ，可以为您执行上述任务：**

var values = _.values(users);

*I don't use Angular myself, but I'm pretty sure there will be a convenience method build in for iterating over a hash's values (ah, there we go, Artem Andreev provides the answer above :))* **我自己不使用Angular，但我很确定会有一个方便的方法来迭代哈希的值（啊，我们去，Artem Andreev提供上面的答案:)）**

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### \#4楼 ###

*I would also like to mention a new functionality of [AngularJS `ng-repeat`][AngularJS _ng-repeat] , namely, special repeat **start** and **end points** .* **我还想提一下[AngularJS `ng-repeat`][AngularJS _ng-repeat]的新功能，即特殊的重复起点和终点 。** *That functionality was added in order to repeat a series of HTML elements instead of just a single parent HTML element.* **添加了该功能是为了重复*一系列* HTML元素，而不是仅重复*单个*父HTML元素。**

*In order to use repeater start and end points you have to define them by using `ng-repeat-start` and `ng-repeat-end` directives respectively.* **要使用转发器起点和终点，必须分别使用`ng-repeat-start`和`ng-repeat-end`指令定义它们。**

*The `ng-repeat-start` directive works very similar to `ng-repeat` directive.* **`ng-repeat-start`指令与`ng-repeat`指令非常相似。** *The difference is that is will repeat **all** the HTML elements (including the tag it's defined on) up to the ending HTML tag where `ng-repeat-end` is placed (including the tag with `ng-repeat-end` ).* **区别在于将重复所有 HTML元素（包括它定义的标记），直到放置`ng-repeat-end`的结束HTML标记（包括带有`ng-repeat-end`的标记）。**

***Sample code (from a controller):*** **示例代码（来自控制器）：**

// ...
    $scope.users = {};
    $scope.users["182982"] = {name:"John", age: 30};
    $scope.users["198784"] = {name:"Antonio", age: 32};
    $scope.users["119827"] = {name:"Stephan", age: 18};
    // ...

***Sample HTML template:*** **示例HTML模板：**

<div ng-repeat-start="(id, user) in users">
        ==== User details ====
    </div>
    <div>
        <span>{
       {$index+1}}. </span>
        <strong>{
       {id}} </strong>
        <span class="name">{
       {user.name}} </span>
        <span class="age">({
       {user.age}})</span>
    </div>
    
    <div ng-if="!$first">
       <img src="/some_image.jpg" alt="some img" title="some img" />
    </div>
    <div ng-repeat-end>
        ======================
    </div>

*Output would look similar to the following (depending on HTML styling):* **输出看起来类似于以下内容（取决于HTML样式）：**

==== User details ====
    1.  119827 Stephan (18)
    ======================
    ==== User details ====
    2.  182982 John (30)
    [sample image goes here]
    ======================
    ==== User details ====
    3.  198784 Antonio (32)
    [sample image goes here]
    ======================

*As you can see, `ng-repeat-start` repeats all HTML elements (including the element with `ng-repeat-start` ).* **如您所见， `ng-repeat-start`重复所有HTML元素（包括带有`ng-repeat-start`的元素）。** *All `ng-repeat` special properties (in this case `$first` and `$index` ) also work as expected.* **所有`ng-repeat`特殊属性（在本例中`$first`和`$index` ）也按预期工作。**

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### \#5楼 ###

*In Angular 7, the following simple example would work (assuming dictionary is in a variable called `d` ):* **在Angular 7中，以下简单示例将起作用（假设字典位于名为`d`的变量中）：**

*my.component.ts:* **my.component.ts：**

keys: string[] = [];  // declaration of class member 'keys'
    // component code ...
    
    this.keys = Object.keys(d);

*my.component.html: (will display list of key:value pairs)* **my.component.html :(将显示键：值对的列表）**

[How to use ng-repeat for dictionaries in AngularJs]: https://oldbug.net/q/Oi4n/How-to-use-ng-repeat-for-dictionaries-in-AngularJs
[https_stackoom.com_question_Oi4n_AngularJs_ng-repeat]: https://stackoom.com/question/Oi4n/%E5%A6%82%E4%BD%95%E5%9C%A8AngularJs%E4%B8%AD%E4%BD%BF%E7%94%A8ng-repeat%E8%BF%9B%E8%A1%8C%E8%AF%8D%E5%85%B8
[ngRepeat documentation]: https://docs.angularjs.org/api/ng/directive/ngRepeat
[http_jsfiddle.net_WRtqV_1]: http://jsfiddle.net/WRtqV/1/
[underscore.js]: http://underscorejs.org/
[values_ method]: http://underscorejs.org/#values
[AngularJS _ng-repeat]: http://docs.angularjs.org/api/ng.directive:ngRepeat