指令模板必须只有一个根元素 [英] Template for directive must have exactly one root element

问题描述

我是 angularJs 的新手.我正在尝试创建包含输入元素和按钮的新指令.我想使用此指令在单击按钮时清除输入文本.

当我在 html 中使用我的指令时，出现以下错误:

错误:[$compile:tplrt] 指令cwClearableInput"的模板必须正好有一个根元素.

html:

<cw-clearable-input ng-model="attributeName"></cw-clearable-input>

clearable_input.js:

angular.module('cw-ui').directive('cwClearableInput', function() {返回 {限制:'EAC'，要求:'ngModel'，转置:真实，替换:真的，模板:'<input type="text" class="form-control"/><span class="input-group-btn"><button type="button" class="btn" ng-click="" title="编辑"><span class="glyphicon-pencil"></span></button></span>',控制器:函数($scope){}};});

我无法弄清楚如何实现这一目标.

解决方案

嗯，这个错误是不言自明的.您的模板需要有一个根，而您的模板有两个.解决此问题的最简单方法是将整个内容包装在 div 或 span 中:

模板:'<div><input type="text" class="form-control"/><span class="input-group-btn"><button type="button" class="btn" ng-click="" title="编辑"><span class="glyphicon-pencil"></span></button></span></div>',

之前:

<span class="input-group-btn"><button type="button" class="btn" ng-click="" title="编辑"><span class="glyphicon-pencil"></span></span>

之后:

<!-- <- 一个根--><input type="text" class="form-control"/><span class="input-group-btn"><button type="button" class="btn" ng-click="" title="编辑"><span class="glyphicon-pencil"></span></span>

I am new to angularJs. I am trying to create new directive which contains input element and a button. I want to use this directive to clear input text when button is clicked.

When I use my directive in html I am getting below error :

Error: [$compile:tplrt] Template for directive 'cwClearableInput' must have exactly one root element. 

html:

<div class="input-group">
         <cw-clearable-input ng-model="attributeName"></cw-clearable-input>
 </div>

clearable_input.js:

angular.module('cw-ui').directive('cwClearableInput', function() {
  return {
    restrict: 'EAC',
    require: 'ngModel',
    transclude: true,
    replace: true,
    template: '<input type="text" class="form-control"/><span class="input-group-btn"><button type="button" class="btn" ng-click="" title="Edit"><span class="glyphicon-pencil"></span></button></span>',
    controller: function( $scope ) {

    }
};
});

I am not able to figure it out how to achieve this.

解决方案

Well, the error is pretty self-explanatory. Your template needs to have a single root and yours has two. The simplest way to resolve this would be to just wrap the whole thing in a div or a span:

template: '<div><input type="text" class="form-control"/><span class="input-group-btn"><button type="button" class="btn" ng-click="" title="Edit"><span class="glyphicon-pencil"></span></button></span></div>',

Before:

<input type="text" class="form-control"/>
<span class="input-group-btn">
  <button type="button" class="btn" ng-click="" title="Edit">
    <span class="glyphicon-pencil"></span>
  </button>
</span>

After:

<div>    <!--  <- one root   -->
  <input type="text" class="form-control"/>
  <span class="input-group-btn">
    <button type="button" class="btn" ng-click="" title="Edit">
      <span class="glyphicon-pencil"></span>
    </button>
  </span>
</div>

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