何时使用ng-attr? [英] When to use ng-attr?

问题描述

似乎使用直接属性和ng-attr-*指令可以做相同的事情.例如，以下等价渲染:

It seems like using direct attributes and the ng-attr-* directive do the same thing. For example, the following render equivalently:

   <div ng-attr-id="{{ 'object-' + value }}">ID</div>
   <div id="{{ 'object-' + value }}">ID</div>

何时应使用ng-attr-*，何时应使用直接HTML属性?

When should I use ng-attr-* and when should I use the direct HTML attribute?

推荐答案

ng-attr用于在上下文中添加或不添加属性.如果表达式为{{undefined || null}}，则不添加属性，否则，如果属性具有值，则将属性添加为值{{ value }}. 最常见的情况是插值. 有关的: 在Angular指令模板中有条件地添加数据属性

ng-attr is used for add or not the attribute in context. If the expression {{undefined || null}}, the attribute is not added otherwise if has a value then attribute is added with the value {{ value }}. The most common cases is in interpolation. Related: Conditionally adding data-attribute in Angular directive template

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