Introduction to dynamic generation of vue v-model

This article shares with you the relevant knowledge points and example codes of dynamic generation of vue v-model. Interested friends can refer to it for reference.

1. The field names bound to the input input box v-model need to be dynamically generated based on the data returned from the background. At this time, v-model binding cannot be used, but the traditional method value dynamic binding is used. , and use child component binding to pass values ​​and events to the parent component. The code is as follows:

//子组件
<template>
 <input v-if="type === 0" type="text" :value="currentValue" @change="handleInput">
 <textarea v-else :value="currentValue" @change="handleInput"></textarea>
</template>

<script>
export default {
// 接收父组件传递过来的状态（值）
 props: {
  type: Number,  //0 input框 1 文本域
  value: String  // 值有时候编辑状态也是先要获取值的 类似 v-model
 },
 data() {
  return {
   currentValue: this.value
  }
 },
 methods: {
  handleInput(e) {
   let value = e.target.value
   if (value === this.currentValue) {
    return
   } else {
    this.currentValue = value
   }
   this.$emit(&#39;input&#39;, value)
  }
 }
}
</script>

//父组件
//extendTypes 动态获取过来的扩展字段 需要绑定的model 为item.extendKey

<p class="form-group" v-for="item in extendTypes">
  <p>
   <ad-input :value="extendTypesModel[item.extendKey]" :type="item.type" @input="handleUpdate(item.extendKey, $event)">
   </ad-input>
  </p>
</p>

// model是动态的，不可以写死，只能在本地先定义一个json extendTypesModel，在获取过来后台的数据之后，本地赋值为空
this.extendTypesModel = {}
if (res && res.code === 0) {
  for (let i = 0; i < res.data.length; i++) {
  this.extendTypesModel[res.data[i].extendKey] = &#39;&#39;
}
  this.extendTypes = res.data
}

//父组件注册的事件
handleUpdate(key, value) {
 this.extendTypesModel[key] = value
}

The parent and child components communicate through custom properties and custom events.

The parent component's custom attribute v-bind passes the parent's value to the child

The child component accepts the parent's value through props. After acceptance, it can be directly like data. Use it.

The child component passes the value to the parent component through the $.emit(parent component method name, value) method. The parent component gets the value and triggers the parent component's event.

This method seems to be a pitfall now because the sub-component will have a cache for the data. Each time it does not generate a new input box, but checks whether it has been generated before. If so, it will not be generated. , so the data has a cache. If it cannot be cleared, it is simply a simpler way

<p class="form-group" v-for="(item, index) in extendTypes">
  <label class="control-label">{{item.extendName}}</label>

  // 既不需要用v-model绑定 也不需要用到子组件 将赋值和取值分开来 而不是用 v-model去绑定，这里取值用到 ref

    <input class="form-control" :value="extendTypesModel[item.extendKey]" @input="handleUpdate(item.extendKey, index)" ref="ipt">
   </p>
   <p class="text-danger" v-if="item.isRequired === 1">*</p>
</p>

handleUpdate(key, index) {
  this.extendTypesModel[key] = this.$refs.ipt[index].value
}

ref binds the value ref to the element or sub-component to register reference information, binds it to this.ref and binds the value ref to the element Or the sub-component registers reference information and binds it to this.refs. If it is v-for traversal, the binding is an array.

Generally use $ref.name.value to get the value

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