Angular反应形式验证 [英] Angular Reactive form validation

问题描述

我正在使用反应式表单，并且在一些教程中我注意到他们会执行以下操作:

I'm working with a Reactive form and I have noticed in some tutorials they do the following:

HTML

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<input type="text" formControlName="firstName" required>
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.

TS

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firstName: ['', Validators.required]
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.

问题:

如果我只是在 TS 中为什么要在 HTML 中指定 必需" >可以正常工作吗?

Why do I need to specify "required" in the HTML if I just do it in the TS file it works fine?

推荐答案

实际上，Angular提到了有关

Actually, Angular mention something about that here:

警告:将这些HTML5验证属性与Angular的反应式提供的内置验证器.使用这些结合使用可防止在表达式更改后出现错误模板已检查.

Caution: Use these HTML5 validation attributes in combination with the built-in validators provided by Angular's reactive forms. Using these in combination prevents errors when the expression is changed after the template has been checked.

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