单击按钮是否可以绑定和取消绑定元素? -AngularJS [英] Is it possible to bind and unbind an element on button click? - AngularJS

问题描述

我创建了一个显示文本和一个输入字段，并将它们与ng-model绑定在一起，如下所示.

I created a display text and an input field and bind them together with ng-model as follow.

HTML

  <div ng-app ng-controller="test">
    <div ng-bind="content"></div>
    <input id="txtElem" type="text" ng-model="content">
        <button ng-click="stopBinding()"> Unbind</button>
        <button ng-click="binding()"> Bind </button>
  </div>

JS

function test( $scope ) {
    $scope.content = 'Welcome';

     $scope.binding = function() {
       angular.element(document.getElementById('txtElem')).bind();
    };

    $scope.stopBinding = function() {
       angular.element(document.getElementById('txtElem')).unbind();
    };
};

显示

我找到了此方法( http://jsfiddle.net/jexgF/)用于取消绑定方法，但是如果单击绑定"按钮，则不知道如何再次绑定它.有人可以帮忙吗?

I found this(http://jsfiddle.net/jexgF/) for unbind method, but don't know how to bind it again, if "Bind" button is clicked. Anyone could help?

除了<div>和<input>元素之间的绑定和取消绑定之外，还有谁知道如何绑定和取消绑定两个<input>字段?

Apart from bind and unbind between elements of <div> and <input>, anyone know how to bind and unbind two <input> fields?

推荐答案

我不确定示例中的test()函数位于何处，但这不是一个好主意-实际上是一种反模式-在控制器中操作DOM.

I'm not sure where the test() function in your example resides, but it is not a good idea - an anti-pattern, in fact - to manipulate the DOM in the controller.

正确的方法是创建一个与输入变量content分开的变量，该变量代表预览部分.

The proper way is to create a variable, separate from the input variable content, represents the preview part.

您可以仅在View中执行此操作；如果您认为此逻辑是仅查看逻辑. lastBound表示content的最后一个边界值:

You could do this simply in the View; if this logic, in your opinion, is a View-only logic. lastBound represents the last bound value of content:

<div ng-init="binding = true">
   <input ng-model="content">
   <button ng-click="binding = false">Unbind</button>
   <button ng-click="binding = true">Bind</button>

   <div ng-bind="lastBound = (binding && content) || lastBound"></div>
</div>

(此处使用ng-init只是出于说明目的-您应在控制器中设置binding).

(the use of ng-init here is just for illustration purposes - you should set binding in the controller).

如果目的是绑定到另一个ng-model，则解决方案是不同的，但没有什么不同.您仍然需要使用2个变量:

If the intent is to bind to another ng-model, then the solution is different, but not dissimilar. You still need to use 2 variables:

<input ng-model="content" ng-change="preview = (binding && content) || preview">
<input ng-model="preview" ng-change="content = (binding && preview) || content">

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