How to modify and submit the input box in Vue.js

Vue.js is a modern JavaScript framework. Its core is reactive programming of data-driven views, making it easier for developers to manage data and views in front-end development. In Vue.js, due to the two-way binding relationship between data and views, we can easily bind form components (input, checkbox, radio, etc.) to the data model. And when we need to modify the value of the form, how can we better submit the modification? Next, we will discuss how to modify and submit the input box in Vue.js.

In Vue.js, we generally use the v-model directive to bind form components such as input to data. For example, the following example:

<template>
  <div>
    <input v-model="message" type="text">
    <p>你输入的是：{{ message }}</p>
  </div>
</template>

<script>
export default {
  data () {
    return {
      message: 'Hello Vue.js!'
    }
  }
}
</script>

In this example, we bidirectionally bind the input component to the message attribute in data. When the user modifies the value in the input, the message attribute will be updated accordingly. In turn, we can also change the value in the input by modifying the message attribute.

But in actual applications, we usually need to manually submit the form after the user completes the modification, instead of sending a request to the backend every time a modification is made. In this case, we need to implement form submission and modification in Vue.js.

Generally speaking, there are two methods to submit changes in Vue.js:

1. Bind the change event of input

We can use change event to monitor input value changes and submit the modification to the backend when the change event is triggered. For example, the following example:

<template>
  <div>
    <input @change="handleChange" v-model="message" type="text">
    <button @click="handleSubmit">提交</button>
    <p>你输入的是：{{ message }}</p>
  </div>
</template>

<script>
export default {
  data () {
    return {
      message: 'Hello Vue.js!'
    }
  },
  methods: {
    handleChange () {
      // input 的值已被修改
    },
    handleSubmit () {
      // 将修改提交到后端
    }
  }
}
</script>

In this example, we use the change event to monitor the value change of the input and handle this change in the handleChange method. In the handleSubmit method, we can submit the changes to the backend. The disadvantage of this method is that the change event will be triggered every time the value of the input changes, which will increase unneeded data requests.

2. Listen to the update event of input

Another method is to listen to the update event of input. This event is only triggered when the bound data changes, which can be avoided. Unnecessary requests when modifying. For example, the following example:

<template>
  <div>
    <input @input="handleInput" v-model="message" type="text">
    <button @click="handleSubmit">提交</button>
    <p>你输入的是：{{ message }}</p>
  </div>
</template>

<script>
export default {
  data () {
    return {
      message: 'Hello Vue.js!'
    }
  },
  methods: {
    handleInput () {
      // input 的值已被修改
    },
    handleSubmit () {
      // 将修改提交到后端
    }
  }
}
</script>

In this example, we use the input event to monitor the value change of input and handle this change in the handleInput method. In the handleSubmit method, we can submit the changes to the backend. Compared with the first method, this method will only be triggered when actual modifications exist, avoiding unnecessary requests.

Summary:

In Vue.js, we can use the v-model directive to bidirectionally bind form components such as input to data. When we need to modify the value of the form, we can use two methods: the first method is to obtain the value change by listening to the change event of the input, and submit the modification when the event is triggered; the second method is to listen to the change event of the input The update event is used to obtain value changes, and is only triggered when there are actual modifications.

In actual development, we can choose different modification and submission methods according to different scenarios. It should be noted that both modification and submission methods should be defined in methods to avoid confusion and unclearness.

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