attr.disabled null或空字符串返回true [英] attr.disabled null or empty string is returning true

问题描述

如果属性具有值，我试图将输入禁用的属性设置为true，但是如果属性为null或空字符串，则我现在使用的内容似乎返回true.

I am trying to set an inputs disabled attribute to true if a property has a value, however what I am using now seems to be returning true if the property is null or an empty string.

[attr.disabled]="userForm.value.email? true: false"

推荐答案

要删除绑定属性，该值必须为 null 而不是 false

To get an bound attribute removed, the value needs to be null instead of false

[attr.disabled]="userForm.value.email? true: null"

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