Vue+ElementUI实现表单动态渲染、可视化配置的方法

{
 "inline": true,
 "labelPosition": "right",
 "labelWidth": "",
 "size": "small",
 "statusIcon": true,
 "formItemList": [
 {
 "type": "input",
 "label": "姓名",
 "disable": false,
 "readonly": false,
 "value": "",
 "placeholder": "请输入姓名",
 "rules": [],
 "key": "name",
 "subtype": "text"
 },
 {
 "type": "radio",
 "label": "性别",
 "value": "",
 "button": false,
 "border": true,
 "rules": [],
 "key": "gender",
 "options": [
 {
  "value": "1",
  "label": "男",
  "disabled": false
 },
 {
  "value": "0",
  "label": "女",
  "disabled": false
 }
 ]
 }
 ]
}

{
 "name": "Genji",
 "gender": "1"
}

<dynamic-form :config="someConfig" v-model="someData" />

<input v-model="something">

<input
 :value="something"
 @input="something = $event.target.value">

<template>
 <el-form 
 class="dynamic-form" 
 :inline="formConfig.inline" 
 :model="value" 
 :label-position="formConfig.labelPosition" 
 :label-width="formConfig.labelWidth" 
 :size='formConfig.size' 
 :status-icon="formConfig.statusIcon">
 <slot/>
 </el-form>
</template>
<script>
export default {
 props: {
 formConfig: {
 type: Object,
 required: true
 },
 value: {
 type: Object,
 required: true
 }
 },
}
</script>

export default {
 props: {
 formConfig: {...},
 value: {...},
 },
 methods: {
 setDefaultValue() {
 const formData = { ...this.value }
 // 设置默认值
 this.formConfig.formItemList.forEach(({ key, value }) => {
 if (formData[key] === undefined || formData[key] === null) {
  formData[key] = value
 }
 })
 this.$emit('input', formData)
 }
 },
 mounted() {
 this.setDefaultValue()
 },
}

{
 "type": "input",
 "label": "姓名",
 "disable": false,
 "readonly": false,
 "value": "",
 "placeholder": "请输入姓名",
 "rules": [],
 "key": "name",
 "subtype": "text"
}

<el-form-item>
 <component :is="`el-${item.type}`" />
</el-form-item>

<el-form-item>
 <el-input v-if="item.type === 'input'" />
 <span v-else>未知控件类型</span>
</el-form-item>

<template>
 <el-form-item :rules="item.Rules" :label="item.label" :prop="item.key">
 <el-input 
 v-if="item.type==='input'" 
 v-bind="$attrs" v-on="$listeners" 
 :type="item.subtype" 
 :placeholder="item.placeholder" 
 :disabled="item.disable" 
 :readonly="item.readonly" 
 :autosize="item.autosize"></el-input>
 <el-select 
 v-else-if="item.type==='select'" 
 v-bind="$attrs" v-on="$listeners"
 :multiple="item.multiple" 
 :disabled="item.disabled" 
 :multiple-limit="item.multipleLimit">
  <el-option 
  v-for="o in item.options" 
  :key="o.value" 
  :label="o.label" 
  :value="o.value" 
  :disabled="o.disabled">
  </el-option>
 </el-select>
 <!--突然有点想念JSX-->
 ...
 <span v-else>未知控件类型</span>
 </el-form-item>
</template>
<script>
export default {
 props: {
 item: {
 type: Object,
 required: true
 }
 }
}
</script>

<dynamic-form-item
 v-for="item in formConfig.formItemList"
 :key="item.key"
 v-if="value[item.key]!==undefined"
 :item="item"
 :value="value[item.key]"
 @input="handleInput($event, item.key)" />

methods: {
 handleInput(val, key) {
 // 这里element-ui没有上报event，直接就是value了
 this.$emit('input', { ...this.value, [key]: val })
 },
 setDefaultValue() {...}
},

<!--普通使用-->
<input-number 
 v-model="someNumber"
 :min="1" 
 :max="99" 
 :decimal1="2" 
 append="元"></input-number>
<!--在dynamic-form-item中的应用-->
<input-number 
 v-else-if="item.type==='number'" 
 v-bind="$attrs" v-on="$listeners" 
 :min="item.min" 
 :max="item.max" 
 :decimal1="item.decimal1" 
 :append="item.append" 
 :prepend="item.prepend" 
 :disabled="item.disabled"></input-number>

{
 "type": "input",
 ...
 "rules":[
  {
   "sql": "SELECT {key} FROM balabala",
   "message": "xx已被占用",
   "trigger": "blur"
  }
 ]
}

<template>
 <el-form-item :rules="Rules" >
  ...
 </el-form-item>
</template>
<script>
import request from '@/utils/request'
export default {
 props: {
 item: {...}
 },
 computed: {
 Rules() {
  const rules = this.item.rules
  if (rules === undefined) return undefined
  const R = []
  rules.forEach(rule => {
  if (rule.sql) {
   const validator = (rule2, value, callback) => {
   // 根据项目自行修改
   request('/api/validate', 'POST', {
    key: rule2.field,
    value,
    sql: rule.sql.replace(/{key}/ig, rule2.field)
   })
    .then(res => {
    callback(!res || undefined)
    })
    .catch(err => {
    this.$message.error(err.message)
    callback(false)
    })
   }
   R.push({ validator, message: rule.message, trigger: 'blur' })
  } else {
   R.push(rule)
  }
  })
  return R
 }
 },
}
</script>

{
 "type": "cascader",
 ...
 "areaShortcut": "provinceAndCityData"
}

<template>
 <el-form-item>
  ...
  <el-cascader 
   :options="item.options || require('element-china-area-data')[item.areaShortcut]"
   ></el-cascader>
 </el-form-item>
</template>

{
 "type": "checkbox",
 ...
 "optionsUrl": "/api/some/options"
}

<template>
 <el-form-item>
  ...
  <el-select>
   <el-option 
    v-for="o in item.options || ajaxOptions"
    ></el-option>
  </el-select>
 </el-form-item>
</template>
<script>
import request from '@/utils/request'
export default {
 props: {
 item: {...}
 },
 computed: {...},
 data() {
 return {
  ajaxOptions: []
 }
 },
 created() {
 const { optionsUrl, key, type } = this.item
 if (optionsUrl) {
  // 根据项目自行修改
  request(`${optionsUrl}?key=${key}`, 'GET')
  .then(res => {
   this.ajaxOptions = res
  })
  .catch(err => { this.$message.error(err.message) })
 }
 }
}
</script>