How to realize registration in vue and only enter numbers

Vue is a popular JavaScript framework, which can provide us with a convenient and fast development environment and operation method. In Vue, we can use the v-model directive to implement data binding in the page, and we can set the input box to only enter numbers.

In actual development, we often need to use input boxes in the page, such as mobile phone number, password, etc. in the registration page. Sometimes, we want users to enter only numbers and not other types of data. So, how to realize that the input box in Vue can only enter numbers? Below, we will introduce in detail how to implement an input box that can only input numbers in Vue.

1. Use native JavaScript to implement the number input box

The Vue framework itself does not provide an input box component that only allows the input of numbers, but we can use native JavaScript to implement it. An input box that only allows numbers to be entered. The specific implementation method is as follows:

<template>
   <div>
      <input type="text" v-model="number" @keyup="filterNumber"/>
   </div>
</template>

In this code, we first define an input box and use the v-model directive to bind the data in the input box. Next, we use the @keyup event directive, which calls the filterNumber function every time the keyboard is lifted.

The specific filterNumber code is as follows:

<script>
export default {
   data(){
      return {
         number: ""
      }
   },
   methods: {
      filterNumber(){
         this.number = this.number.replace(/[^\d]/g,"")
      }
   }
}
</script>

In this code, we first define a number variable in data, and use regular expressions to determine whether there is a non-number variable in the variable. The numeric character, if present, is replaced with the null character.

Finally, mount the filterNumber method into the component through methods, and use the @keyup event instruction in the template to call the method, achieving the effect of only allowing numbers to be entered.

2. Use Vue directives to implement number input boxes

Another way to implement an input box that only allows numbers to be entered is to use Vue directives. The Vue directive is an important concept in the Vue framework, which allows us to manipulate DOM elements more conveniently. The specific implementation method is as follows:

<template>
   <div>
      <input type="text" v-model.number="number"/>
   </div>
</template>

In this code, we use the v-model.number instruction, which converts the data in the input box into a numeric type. In this way, Vue will automatically filter out non-numeric characters when users enter them.

It should be noted that when using the v-model.number directive, the user must enter numeric type data, otherwise Vue will convert it into the number 0.

3. Use third-party plug-ins to implement numeric input boxes

In addition to using native JavaScript and Vue instructions to implement input boxes that only allow number input, we can also use third-party plug-in to achieve this effect. Two commonly used plug-ins are introduced below: v-money and vue-numeric.

The v-money plug-in is a Vue plug-in specially designed to handle currency input. It can automatically format currency input, and can set the input box to only allow the input of numbers. The specific implementation method is as follows:

<template>
   <div>
      <input type="text" v-model="number" v-money="money"/>
   </div>
</template>

<script>
import money from 'v-money'
Vue.use(money)
export default {
   data(){
      return {
         number: "",
         money: {
            precision: 2,  // 保留小数位数
            allowNegative: false,  // 是否允许输入负数
            prefix: '$',  // 货币符号
            suffix: '',  // 货币符号
            decimal: '.',  // 小数点符号
            thousands: ',',  // 千分位符号
            masked: false  // 是否使用掩码
         }
      }
   }
}
</script>

In this code, we first import the v-money plug-in and register the plug-in using the Vue.use() method. Next, use the v-money directive in the template, and define a money object as a parameter of the v-money directive. Some parameters can be set in this object to control the format and restrictions of the input box.

vue-numeric plug-in is also a Vue plug-in specially designed to handle numeric input, which can easily implement an input box that only allows the input of numbers. The specific implementation method is as follows:

<template>
   <div>
      <input type="text" v-model.number="number" v-numeric />
   </div>
</template>

<script>
import VueNumeric from 'vue-numeric'
Vue.use(VueNumeric)
export default {
   data(){
      return {
         number: ""
      }
   }
}
</script>

In this code, we first import the vue-numeric plug-in and register the plug-in using the Vue.use() method. Then, use the v-numeric directive in the template to achieve the effect of only allowing numbers to be entered.

Summary

The above is the method of implementing an input box that only allows the input of numbers in Vue, including native JavaScript, Vue instructions and third-party plug-ins. In actual development, we can choose the corresponding method according to project needs. No matter which method is used, excellent results and user experience can be achieved, allowing users to enter digital data quickly and accurately.

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