What does the v-model directive in vue do?

The role of the v-model directive in Vue

v-model is a powerful directive in Vue.js. It provides an easy way to input elements. Data are bound to their values. It is responsible for bidirectional synchronization of data between input elements and the data model of the Vue instance.

The three main functions of the v-model directive:

1. Two-way data binding:
v-model implements two-way data Binding, which means that when the user changes the value of an input element, Vue automatically updates the underlying data model. In turn, when the data model is updated, the values ​​of the input elements automatically reflect the updated values.

2. Input value validation:
v-model contains built-in input validation functionality. It can automatically detect and validate the value of text input, numeric input and date input elements. If illegal input is detected, it displays an error message on the element.

3. Keyboard event handling:
v-model allows v-on event modifiers (such as @keyup and @keydown) to be used to handle keyboard events. These modifiers can trigger custom behaviors, such as performing actions when specific characters are entered into an input box.

Using v-model Directive:

To use v-model, just add it to the input element and specify the name of the data attribute to be bound:

<input v-model="myData">

Among them, "myData" is the data attribute in the Vue instance to be bound.

Advantages:

• Simplified data binding: v-model provides a simple and consistent way to bind data , eliminating the need to manually manage data updates.
• Input Validation: It provides built-in validation features that help ensure the quality of input data.
• Keyboard event handling: Easily handle keyboard events and perform custom behaviors.
• Cross-platform support: v-model is supported on different platforms such as desktop, mobile and web.

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