在元素内插入一个有角度的 js 模板字符串 [英] Insert an angular js template string inside an element

问题描述

我试图将一些有角度的 js 模板字符串放入一个元素中，并期望得到一个编译输出.但这并没有发生.

HTML

<div ng-bind-html-unsafe="fruitsView"></div>

控制器:

function filterController($scope){...$scope.arr = ["苹果", "香蕉"];$scope.fruitsView = '<div><p ng-repeat="each in arr">{{each}}</p></div>';}

输出只是{{each}}.

那么如何在元素中插入一个有角度的 js 模板字符串(这里是 $scope.fruitsView)?

我为此做了一个fiddle.

解决方案

在这种情况下，您不想只是插入 HTML"，而是要编译它.您可以使用 $compile 服务创建 DOM 节点.

var tpl = $compile('<div><p ng-repeat="each in arr">{{each}}</p></div>')(作用域);

如您所见，$compile 返回一个函数，该函数将作用域对象作为参数，根据该作用域对象评估代码.例如，可以使用 element.append() 将结果内容插入到 DOM 中.

重要说明:但在任何情况下都不会有任何与 DOM 相关的代码属于您的控制器.正确的位置是总是一个指令.这段代码很容易被放入指令中，但我想知道你为什么要以编程方式插入 HTML.

你能在这里说明一下，以便我提供更具体的答案吗?

更新

假设您的数据来自一项服务:

.factory( 'myDataService', function () {返回函数(){//显然是 $httpreturn [ "苹果", "香蕉", "橙色" ];};});

你的模板来自一个服务

.factory( 'myTplService', function () {返回函数(){//显然是 $httpreturn '<div><p ng-repeat="item in items">{{item}}</p></div>';};});

然后创建一个简单的指令，读取提供的模板，编译它，并将其添加到显示中:

.directive( 'showData', function ( $compile ) {返回 {范围:真实，链接:函数(范围、元素、属性){变种；attrs.$observe('模板'，函数(tpl){如果(angular.isDefined(tpl)){//根据当前作用域编译提供的模板el = $compile( tpl )( scope );//清空元素的愚蠢方式element.html("");//添加模板内容element.append(el);}});}};});

那么从你的角度来看:

<button ng-click="showContent()">显示内容</button><div show-data template="{{template}}"></div>

在控制器中，您只需将其绑定在一起:

.controller( 'MyCtrl', function ( $scope, myDataService, myTplService ) {$scope.showContent = 函数 () {$scope.items = myDataService();//<- 应该更好地传达给指令$scope.template = myTplService();};});

它们应该一起工作！

PS:这一切都假设您的模板来自服务器.如果没有，那么您的模板应该在指令中，这样可以简化事情.

Im trying to put some angular js template string inside an element, and expect an complied output. But that's not happening.

HTML

<div ng-controller="testController">
    <div ng-bind-html-unsafe="fruitsView"></div>
</div>

Controller:

function filterController($scope){
    ...
    $scope.arr = ["APPLE", "BANANA"];
    $scope.fruitsView = '<div><p ng-repeat="each in arr">{{each}}</p></div>';
}

The ouput is just {{each}}.

So how do i insert an angular js template string (here $scope.fruitsView) inside an element?

I have made a fiddle for this.

解决方案

In this case, you don't want to just "insert HTML", but compile it. You can create DOM nodes using the $compile service.

var tpl = $compile( '<div><p ng-repeat="each in arr">{{each}}</p></div>' )( scope );

As you can see, $compile returns a function that takes a scope object as a parameter, against which the code is evaluated. The resultant content can be inserted into the DOM with element.append(), for example.

Important note: But under no circumstances does any DOM-related code belong in your controller. The proper place is always a directive. This code can easily be thrown into a directive, but I wonder why you are programmatically inserting the HTML at all.

Can you shed some light here so I can provide a more specific answer?

Update

Assuming your data comes from a service:

.factory( 'myDataService', function () {
  return function () {
    // obviously would be $http
    return [ "Apple", "Banana", "Orange" ];
  };
});

And your template comes from a service

.factory( 'myTplService', function () {
  return function () {
    // obviously would be $http
    return '<div><p ng-repeat="item in items">{{item}}</p></div>';
  };
});

Then you create a simple directive that reads in the provided template, compiles it, and adds it to the display:

.directive( 'showData', function ( $compile ) {
  return {
    scope: true,
    link: function ( scope, element, attrs ) {
      var el;

      attrs.$observe( 'template', function ( tpl ) {
        if ( angular.isDefined( tpl ) ) {
          // compile the provided template against the current scope
          el = $compile( tpl )( scope );

          // stupid way of emptying the element
          element.html("");

          // add the template content
          element.append( el );
        }
      });
    }
  };
});

Then from your view:

<div ng-controller="MyCtrl">
   <button ng-click="showContent()">Show the Content</button>
   <div show-data template="{{template}}"></div>
</div>

And in the controller, you simply tie it together:

.controller( 'MyCtrl', function ( $scope, myDataService, myTplService ) {
  $scope.showContent = function () {
    $scope.items = myDataService(); // <- should be communicated to directive better
    $scope.template = myTplService();
  };
});

And it should all work together!

PS: this is all assuming your template comes from the server. If it doesn't, then your template should be in the directive, which simplifies things.

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