How to develop custom directives in vue

This article mainly introduces the relevant information of vue custom instruction directive. The following is an introduction to you through examples. Friends who need it can refer to it.

The following is an introduction to vue customization. Instruction directive, the specific content is as follows:

v-model, v-if, v-for, v-show), vue also allows users to register some of their own functional instructions. Sometimes you really want to operate the Dom. At this time, it is automatic It is most appropriate to define instructions.

Vue.directive('zsqfocus', { // 注册一个全局自定义指令 `v-zsqfocus`，在main.js文件里
 inserted: function (el) { // 当被绑定的元素插入到 DOM 中时自动调用
 el.focus() // 聚焦元素
 }
})

<script>
export default {
 directives: { // 指令的定义
  zsqfocus: {
   inserted: function (el) { // 获得焦点
    el.focus()
   }
  }
  }
 }
</script>

<template>
 <input v-zsqfocus /> //调用 
</template>

PS: Let’s take a look at the example code of vue’s custom instruction directive. The specific code is as follows:

<template>
 <p>
  <input v-model="dir1" v-my-directive1="dir1"/>　　　　 <input v-model="dir2" v-my-directive2="dir2"/>
 </p>
</template>
<script>
 export default {
  data(){
   return {　　　　　　　　　dir1:&#39;&#39;,　　　　　　　　　dir2:&#39;&#39;
　　　　　　　}
  },
  directives:{　　　　　　　//直接绑定函数，作用等同于update,不做准备工作和扫尾工作
   myDirective1(val){
    console.log(val)
   },　　　　　　　myDirective2:{　　　　　　　　　　bind(){　　　　　　　　　　　　　//第一次绑定到元素的准备工作　　　　　　　　　　},　　　　　　　　　　update(val，old){　　　　　　　　　　　　//在绑定到元素后立即以初始值第一次调用，然后每次example2变化都会调用update　　　　　　　　　　　　console.log(val)　　　　　　　　　　},　　　　　　　　　　　　unbind(){　　　　　　　　　　　　//销毁前的清理工作　　　　　　　　　　}　　　　　　　}
  }
 }
</script>

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