如何在Angular 2中添加条件属性？ [英] How to add conditional attribute in Angular 2?

问题描述

如何有条件地添加元素属性，例如复选框的已选中？

How can I conditionally add an element attribute e.g. the checked of a checkbox?

以前版本的Angular有 NgAttr 我觉得 NgChecked 这些似乎都提供了我所追求的功能。但是，这些属性似乎不存在于Angular 2中，我看不到提供此功能的其他方式。

Previous versions of Angular had NgAttr and I think NgChecked which all seem to provide the functionality that I'm after. However, these attributes do not appear to exist in Angular 2 and I see no other way of providing this functionality.

推荐答案

null 将其删除：

[attr.checked]="value ? '' : null"

或

[attr.checked]="value ? 'checked' : null"

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