Getting to combat web front end: the operation of Sao form validation css

Renderings

principle

Form elements, there is a patternproperty, can customize the regular expression (e.g., phone number, email,.); valid伪类Can be matched by patternthe element verified; invalid伪类on the contrary, can match failed patternelements authenticated; so he can easily do it, the above renderings just do some simple effects, more effects and limit everyone to play to their imagination slightly;

html

The layout is simple, inputwith buttonthe relationship between siblings, the requiredproperty is required meaning, that is, the contents of the input must be validated;

<section class="container">
  <input type="text" name="tel" placeholder="请输入手机号码" pattern="^1[3456789]\d{9}$" required><br>
  <input type="text" name="smscode" placeholder="请输入验证码" pattern="\d{4}" required><br>
  <button type="submit"></button>
</section>

css

As used herein is a scsspreprocessor, a clear structure

input {
  // 验证通过时按钮的样式
  &:valid {
    &~button {
      pointer-events: all;
      cursor: pointer;

      &::after {
        content: "提交"
      }
    }
  }

  // 验证不通过时按钮的样式
  &:invalid {
    &~button {
      pointer-events: none; // 去除点击事件，让按钮无法点击

      &::after {
        content: "未通过验证"
      }
    }
  }
}
web前端开发学习Q-q-u-n：784783012 ，分享学习的方法和需要注意的小细节，不停更新最新的教程和学习方法（详细的前端项目实战教学视频）

If you liked this article, please do not forget to point a praise or attention