Basic usage of Vue3 v-bind instruction

In Vue 3,v-bind Directives are used to bind the value of an expression to the properties of the DOM element. The syntax of this directive is the same as Vue 2, but with some minor changes and improvements.

The following is Vue 3v-bind Basic usage of instructions:

Basic usage:

<button v-bind:class="{ active: isActive }">Click me</button>

In this example,isActive is a boolean value, when it is true, the button will add a name calledactive class.

Dynamic attribute name: Use object syntax to bind multiple attributes to one element.

<div v-bind:style="{ color: styleColor, fontSize: fontSize }"></div>

In this example,styleColor and fontSize are dynamically calculated attribute names, and their corresponding values are stored instyleColor andfontSize in variable.

Dynamic Components: usev-bind:is To dynamically bind components.

<component :is="currentComponent" />

In this example,currentComponent is a string or object that determines the currently displayed component.

Event Listener: use.sync Modifier to ensure that event listeners are always synchronized.

<input  "value" @input="handleInput">

In this example,@input The event listener will fire when the input box loses focus, and This ensures that the value of the input box is synchronized with the data model.

Custom commands: You can create your own custom directives to extend the functionality of Vue. For example, create a name calledmy-directive The custom directive, the code is as follows:

import { directive } from 'vue';
export default directive({
  bind(el, binding) {
    // Write your code logic here...  },
  update(el, binding, oldValue) {
    // Write your code logic here...  }
});

Then use this custom directive in the template.

<your-element v-my-directive="bindingValue"></your-element>

In this example, you need to provide the definition of the custom directivebind andupdate Hook the function and use the name of the custom directive and the bound value in the template.

Dynamic scope slots: usev-slot Directives to define dynamic scoped slots.

<template #default="{ item }"> <p>{{ item }}</p> </template>

In this example,#default Indicates the default scope slot where you can access all incoming data. If you need to specify a specific scope slot, you can use:scopedSlot="name" form.

Use the v-bind directive directly in style。

&lt;script setup lang="ts"&gt;
  import { ref } from "vue";
  const color=ref('red')
  const changeColor=()=&gt;="blue"
&lt;/script&gt;
&lt;template&gt;
  &lt;div class="textColor"&gt;hello&lt;/div&gt;
  &lt;button @click="changeColor"&gt;Switch colors&lt;/button&gt;
&lt;/template&gt; 
&lt;style scoped&gt;
.textColor{
  color: v-bind(color);
}
&lt;/style&gt;

In the above example, you can use v-bind to bind dynamic styles directly in style, which is very convenient!

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