Angular Material-如何将工具提示添加到禁用的按钮 [英] Angular Material - How to add a tooltip to a disabled button

问题描述

我注意到指令matTooltip在禁用的按钮上不起作用.我该如何实现?

I've noticed that the directive matTooltip doesn't work on a disabled button. How can I achieve it?

示例:

<button mat-raised-button [disabled]="true" matTooltip="You cannot delete that">
  <mat-icon>delete</mat-icon>
</button>

对于已启用的按钮，它可以完美运行:

For an enabled button it works perfectly:

<button mat-raised-button [disabled]="false" matTooltip="You cannot delete that">
  <mat-icon>delete</mat-icon>
</button>

推荐答案

这不起作用，因为它是由mouseenter事件触发的，大多数浏览器都不会针对禁用元素触发该事件.一种解决方法是将matTooltip添加到父元素:

This doesn't work because it is triggered by mouseenter event which doesn't get fired by most browsers for disabled elements. A workaround is to add matTooltip to a parent element:

<div matTooltip="You cannot delete that" [matTooltipDisabled]="!isButtonDisabled()">
    <button mat-raised-button [disabled]="isButtonDisabled()">
        <mat-icon>delete</mat-icon>
    </button>
</div>

以上示例假定存在一种确定是否应启用按钮的方法.通过使用matTooltipDisabled，只有在禁用该按钮时，工具提示才会显示.

The example above assumes that there is a method for determining if the button should be enabled or not. By using matTooltipDisabled the tooltip will be shown only if the button is disabled.

参考:

• https://github.com/angular/material2/issues/5040
• https://github.com/angular/material2/issues/7953

• https://github.com/angular/material2/issues/5040
• https://github.com/angular/material2/issues/7953

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