VUE3 Getting Started Tutorial: Data Binding and Event Handling-Vue.js-php.cn

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VUE3 Getting Started Tutorial: Data Binding and Event Handling

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Jun 15, 2023 pm 10:18 PM

vuedata bindingevent handling

VUE3 is a UI library based on JavaScript framework and is widely used in front-end development. This article will introduce VUE3 data binding and event processing for beginners.

1. Data binding

Data binding is the most important function in VUE3, which is used to bind data to the page so that data changes can be synchronized to the page. VUE3 adopts the MVVM (Model-View-ViewModel) development model, which can bidirectionally bind model data and views to achieve data synchronization. In actual development, we need to bind data to attributes of HTML tags, such as innerHTML.

The following is a simple data binding example:

<!DOCTYPE html>
<html>
<head>
    <title>VUE3数据绑定示例</title>
    <script src="https://unpkg.com/vue@next"></script>
</head>
<body>
    <div id="app">
        <p>{{ message }}</p>
    </div>
    <script>
        const app = Vue.createApp({
            data() {
                return {
                    message: 'Hello, Vue3!'
                }
            }
        })
        app.mount('#app')
    </script>
</body>
</html>

In the above code, we first introduced the JavaScript file of VUE3, and then defined a div with the id of "app", through "{{ message }}" binds data to a p tag. Next we define a Vue instance and a message attribute in data, whose initial value is "Hello, Vue3!". Finally, we mounted the Vue instance to the div with the ID "app" through the app.mount function. In this way, when our data changes, the content in the p tag will also change.

2. Event processing

Event processing in VUE3 is similar to other JavaScript frameworks, and events are bound through the v-on instruction. For example, we can bind a click event to the button:

<div id="app">
    <button v-on:click="handleClick">Click me</button>
</div>
<script>
    const app = Vue.createApp({
        methods: {
            handleClick() {
                alert('You clicked me!')
            }
        }
    })
    app.mount('#app')
</script>

In the above code, we define a div with the id "app" and bind a click event through the v-on:click directive. When the user clicks the button, the handleClick function will be triggered and a prompt box will pop up.

In addition to click events, VUE3 also supports many other events, such as:

input: text box input event
submit: form submission event
keyup, keydown: keyboard events
mouseover, mouseout: mouse events
...

In actual development, we can write the event processing function In the methods attribute of the Vue instance, as shown in the above code.

3. Summary

Through the introduction of this article, we know the data binding and event processing mechanisms of VUE3. After mastering these two mechanisms, we can start to develop our own applications. program. In the next article, we will continue to introduce other features of VUE3.

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