How to implement keyboard input and input box verification in UniApp

UniApp is a cross-platform development framework based on Vue.js. It can generate applications for multiple platforms such as iOS, Android, and H5 at the same time. In UniApp, we often need to implement some form input functions, such as input box verification, real-time input feedback, etc. This article will introduce how to implement keyboard input and input box verification in UniApp, with code examples.

Keyboard input

In UniApp, we usually use the <input> tag to implement the keyboard input function. For example, we can implement a mobile phone number input box through the following code example:

<template>
  <view>
    <input type="tel" placeholder="请输入手机号" v-model="mobile">
  </view>
</template>

<script>
  export default {
    data() {
      return {
        mobile: ''
      };
    }
  }
</script>

In the above code, we use the v-model instruction to <input>Binded with mobile, realizing two-way data binding. When the user enters a mobile phone number in the input box, the entered content can be assigned to the mobile attribute in real time.

In addition to common text input types, UniApp also supports other types of input, such as number input, password input, etc. By setting different type attributes, we can implement different types of input boxes.

Input box verification

In actual development, we often need to verify the legality of user input, such as determining whether the mobile phone number meets the specifications, whether the password meets the requirements, etc. In UniApp, input box verification can be implemented through regular expressions and the watch listening function.

The following is a simple example that implements mobile phone number verification, which requires that the mobile phone number must be 11 digits:

<template>
  <view>
    <input type="tel" placeholder="请输入手机号" v-model="mobile">
    <text v-show="!isMobileValid">手机号格式不正确</text>
  </view>
</template>

<script>
export default {
  data() {
    return {
      mobile: '',
      isMobileValid: true
    };
  },
  watch: {
    mobile(newVal) {
      const reg = /^(1[3-9])d{9}$/;
      this.isMobileValid = reg.test(newVal);
    }
  }
};
</script>

In the above code, we pass watchListening function to monitor changes in mobile attributes. Every time the content of the input box changes, the listening function will be triggered. In the listening function, we use regular expressions to check whether the entered mobile phone number is legal, and assign the result to the isMobileValid attribute. If the mobile phone number is legal and the isMobileValid attribute value is true, the error text below the input box will be displayed.

In addition to verifying mobile phone numbers, we can also verify other types, such as email, password, etc. By using different regular expressions, we can implement various types of input box validation.

Summary

In UniApp, it is a very common requirement to implement keyboard input and input box verification. By using the <input> tag and the v-model directive, we can easily implement the keyboard input function and implement it by using the watch listening function combined with regular expressions Input box verification. I hope the introduction in this article can help you better implement input functions in UniApp development.

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