在 AngularJS 中轻松操作 dom - 单击按钮，然后将焦点设置到输入元素 [英] Easy dom manipulation in AngularJS - click a button, then set focus to an input element

问题描述

我有这个角度代码:

<div class="first-wrapper"><div class="button" ng-click="doSomething(element,$event)">{{element.name}}</div>
<div class="second-wrapper"><input type="text" value="{{element.value}}">

我想要发生的事情:当用户点击按钮时 - 输入元素将被聚焦.

点击按钮元素并聚焦后如何找到输入元素?

我可以执行如下所示的函数:

function doSomething(element,$event) {//选项A - 开始在黑暗中操作:$event.srcElement.parentNode.childNodes[1]//选项 B - 用 jQuery 包装它:$($event.srcElement).closest('.element-wrapper').find('input').focus();}

它们都不起作用 - 有更好的 Angular 方法吗?像在 jQuery 中一样使用 .closest() 和 .find() 等函数?

更新:

我发现这个 hack 有效(但它似乎仍然不是正确的解决方案):

function doSomething(element,$event) {设置超时(功能(){$($event.srcElement).closest('.element-wrapper').find('input').focus();},0)}

我用 setTimeout 包装它，所以在 Angular 完成其所有操作后，它专注于输入元素.

解决方案

DOM 操作应该在指令中而不是在控制器中.我会定义一个 focusInput 指令并在按钮上使用它:

{{element.name}}

指令:

app.directive('focusInput', function($timeout) {返回 {链接:函数(范围，元素，属性){element.bind('点击', function() {$超时(功能(){element.parent().parent().find('input')[0].focus();});});}};});

Plunker

由于 jqLit​​e 在 DOM 遍历方法方面相当有限，我不得不使用 parent().parent().您可能希望使用 jQuery 或一些 JavaScript 方法.

正如您已经发现的那样，需要 $timeout 以便在浏览器呈现后调用 focus() 方法(即，完成处理点击事件).

find('input')[0] 允许我们访问 DOM 元素，允许我们使用 JavaScript focus() 方法(而不是 find('input').focus() 这需要 jQuery.

I have this angular code:

<div class="element-wrapper" ng-repeat="element in elements">
  <div class="first-wrapper">
     <div class="button" ng-click="doSomething(element,$event)">{{element.name}}</div>   
  </div>
  <div class="second-wrapper">
    <input type="text" value="{{element.value}}">    
  </div>
</div>

What I want to happen: when the user clicks the button - the input element will be focused.

How do I find the input element after I click the button element and focus it?

I can do a function that looks like this:

function doSomething(element,$event) {
  //option A - start manipulating in the dark:
  $event.srcElement.parentNode.childNodes[1]

  //option B - wrapping it with jQuery:
   $($event.srcElement).closest('.element-wrapper').find('input').focus();
}

Neither of them work - Is there a nicer Angular way to do it? Using functions such as .closest() and .find() as in jQuery?

Update:

I found this hack to be working (but it still doesn't seem like the correct solution):

function doSomething(element,$event) {
   setTimeout(function(){
     $($event.srcElement).closest('.element-wrapper').find('input').focus();
   },0)
}

I am wrapping it with setTimeout so after Angular finishes all of its manipulations it focuses on the input element.

解决方案

DOM manipulation should be in a directive instead of the controller. I would define a focusInput directive and use it on the button:

<div class="button" focus-input>{{element.name}}</div>   

Directive:

app.directive('focusInput', function($timeout) {
  return {
    link: function(scope, element, attrs) {
      element.bind('click', function() {
        $timeout(function() {
          element.parent().parent().find('input')[0].focus();
        });
      });
    }
  };
});

Plunker

Since jqLite is rather limited in terms of DOM traversal methods, I had to use parent().parent(). You may wish to use jQuery or some JavaScript methods.

As you already found out, $timeout is needed so that the focus() method is called after the browser renders (i.e., finishes handling the click event).

find('input')[0] gives us access to the DOM element, allowing us to use the JavaScript focus() method (rather than find('input').focus() which would require jQuery).

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