Detailed explanation of input box binding events in Vue documents

Vue.js is a lightweight JavaScript framework that is easy to use, efficient and flexible. It is one of the most popular front-end frameworks currently. In Vue.js, input box binding events are a very common requirement. This article will introduce the input box binding events in the Vue document in detail.

1. Basic concepts

In Vue.js, the input box binding event refers to binding the value of the input box to the data object of the Vue instance to achieve input and response. Two-way binding. In Vue.js, you can use the v-model directive to achieve two-way binding between the input box and the Vue instance. The syntax is as follows:

<input v-model="variable">

Among them, v-model is used in conjunction with the input tag, and variable represents the value in the Vue instance. a data variable.

2. Implementation steps

1. Create a Vue instance

First, you need to create a Vue instance and implement it through the new Vue() method. When creating a Vue instance, you need to pass in an object as a parameter, which contains various configuration options and data binding of the Vue instance.

The following is a simple Vue instance code example:

var vm = new Vue({
    el: '#app',
    data: {
        message: 'Hello, Vue!'
    }
});

In the above code, the el attribute represents binding the Vue instance to an HTML element, and the data attribute represents the Vue instance. data object.

2. Bind the input box

In the Vue instance, bind the input box to the Vue data and use the v-model instruction to achieve this. In the following example, the v-model directive is used to bind the message data in the Vue instance to the input box.

<input v-model="message">

3. Add event monitoring

In Vue.js, you can use the v-on directive to implement event monitoring. Therefore, by adding the v-on instruction in the input box, you can monitor changes in the data in the input box. The following is a code example:

<input v-model="message" v-on:input="onChange">

Among them, v-on:input means listening to the input event, and onChange is the event callback function.

4. Event callback function

In Vue.js, when the value in the input box changes, the onchange event function will be called. In the onchange event function, synchronize the input data to the data object of the Vue instance to achieve two-way binding. The following is a code example:

var vm = new Vue({
    el: '#app',
    data: {
        message: ''
    },
    methods: {
        onChange: function() {
            this.message = event.target.value;
        }
    }
});

In the above code, the onChange function is used to update the message data object in the Vue instance, that is, to associate the value in the input box with the message data. Since the v-on directive passes the event object, the input value in the input box can be obtained from event.target.value. Set the value in the input box to the message data object through this.message to complete two-way binding.

3. Summary

To sum up, this article introduces the input box binding events in the Vue document in detail, from creating a Vue instance to binding the input box, to adding event listening and Implementation steps such as writing event callback functions are explained in detail. In Vue.js, you can use the v-model directive and v-on directive to achieve two-way binding and event monitoring between the input box and the Vue instance. I believe it will be helpful for beginners to master the knowledge points described in this article.

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