关于 Parser.vue 表单解析后数据无法绑定的问题

[zhangluJs]

我尝试在自己的demo中运行 /components/parser/example/index.vue 相关代码，但是无法绑定表单中的值，相关事件也无法触发。 和源码一样，只是部分文件路径有调整。不知道问题出在了哪里

render.js

import { deepClone } from '../utils/index'

const componentChild = {}
/**
 * 将./slots中的文件挂载到对象componentChild上
 * 文件名为key，对应JSON配置中的__config__.tag
 * 文件内容为value，解析JSON配置中的__slot__
 */
const slotsFiles = require.context('./slots', false, /\.js$/)
const keys = slotsFiles.keys() || []
keys.forEach(key => {
  const tag = key.replace(/^\.\/(.*)\.\w+$/, '$1')
  const value = slotsFiles(key).default
  componentChild[tag] = value
})

function vModel(dataObject, defaultValue, conf) {
  dataObject.props.value = this.formData ? this.formData[conf.__vModel__] : defaultValue

  dataObject.on.input = val => {
    this.$emit('input', val)
  }
}

function mountSlotFiles(h, confClone, children) {
  const childObjs = componentChild[confClone.__config__.tag]
  if (childObjs) {
    Object.keys(childObjs).forEach(key => {
      const childFunc = childObjs[key]
      if (confClone.__slot__ && confClone.__slot__[key]) {
        children.push(childFunc(h, confClone, key))
      }
    })
  }
}

function emitEvents(confClone) {
  ['on', 'nativeOn'].forEach(attr => {
    const eventKeyList = Object.keys(confClone[attr] || {})
    eventKeyList.forEach(key => {
      const val = confClone[attr][key]
      if (typeof val === 'string') {
        confClone[attr][key] = event => this.$emit(val, event)
      }
    })
  })
}

function buildDataObject(confClone, dataObject) {
  Object.keys(confClone).forEach(key => {
    const val = confClone[key]
    if (key === '__vModel__') {
      vModel.call(this, dataObject, confClone.__config__.defaultValue, confClone)
    } else if (dataObject[key] !== undefined) {
      if (dataObject[key] === null
        || dataObject[key] instanceof RegExp
        || ['boolean', 'string', 'number', 'function'].includes(typeof dataObject[key])) {
        dataObject[key] = val
      } else if (Array.isArray(dataObject[key])) {
        dataObject[key] = [...dataObject[key], ...val]
      } else {
        dataObject[key] = { ...dataObject[key], ...val }
      }
    } else {
      dataObject.attrs[key] = val
    }
  })

  // 清理属性
  clearAttrs(dataObject)
}

function clearAttrs(dataObject) {
  delete dataObject.attrs.__config__
  delete dataObject.attrs.__slot__
  delete dataObject.attrs.__methods__
}

function makeDataObject() {
  // 深入数据对象：
  // https://cn.vuejs.org/v2/guide/render-function.html#%E6%B7%B1%E5%85%A5%E6%95%B0%E6%8D%AE%E5%AF%B9%E8%B1%A1
  return {
    class: {},
    attrs: {},
    props: {},
    domProps: {},
    nativeOn: {},
    on: {},
    style: {},
    directives: [],
    scopedSlots: {},
    slot: null,
    key: null,
    ref: null,
    refInFor: true
  }
}

export default {
  props: {
    conf: {
      type: Object,
      required: true
    },
    formData: {
      type: Object
    }
  },
  render(h) {
    const dataObject = makeDataObject()
    const confClone = deepClone(this.conf)
    const children = this.$slots.default || []

    // 如果slots文件夹存在与当前tag同名的文件，则执行文件中的代码
    mountSlotFiles.call(this, h, confClone, children)

    // 将字符串类型的事件，发送为消息
    emitEvents.call(this, confClone)

    // 将json表单配置转化为vue render可以识别的 “数据对象（dataObject）”
    buildDataObject.call(this, confClone, dataObject)

    return h(this.conf.__config__.tag, dataObject, children)
  }
}

Parser.vue

import { deepClone } from './utils/index';
import render from './render/render.js';
const ruleTrigger = {
  'el-input': 'blur',
  'el-input-number': 'blur',
  'el-select': 'change',
  'el-radio-group': 'change',
  'el-checkbox-group': 'change',
  'el-cascader': 'change',
  'el-time-picker': 'change',
  'el-date-picker': 'change',
  'el-rate': 'change'
}

const layouts = {
  colFormItem(h, scheme) {
    const config = scheme.__config__
    const listeners = buildListeners.call(this, scheme)

    let labelWidth = config.labelWidth ? `${config.labelWidth}px` : null
    if (config.showLabel === false) labelWidth = '0'
    return (
      <el-col span={config.span}>
        <el-form-item label-width={labelWidth} prop={scheme.__vModel__}
          label={config.showLabel ? config.label : ''}>
          <render conf={scheme} on={listeners} formData={this[this.formConf.formModel]}/>
        </el-form-item>
      </el-col>
    )
  },
  rowFormItem(h, scheme) {
    let child = renderChildren.apply(this, arguments)
    if (scheme.type === 'flex') {
      child = <el-row type={scheme.type} justify={scheme.justify} align={scheme.align}>
              {child}
            </el-row>
    }
    return (
      <el-col span={scheme.span}>
        <el-row gutter={scheme.gutter}>
          {child}
        </el-row>
      </el-col>
    )
  }
}

function renderFrom(h) {
  const { formConfCopy } = this

  return (
    <el-row gutter={formConfCopy.gutter}>
      <el-form
        size={formConfCopy.size}
        label-position={formConfCopy.labelPosition}
        disabled={formConfCopy.disabled}
        label-width={`${formConfCopy.labelWidth}px`}
        ref={formConfCopy.formRef}
        // model不能直接赋值 https://github.com/vuejs/jsx/issues/49#issuecomment-472013664
        props={{ model: this[formConfCopy.formModel] }}
        rules={this[formConfCopy.formRules]}
      >
        {renderFormItem.call(this, h, formConfCopy.fields)}
        {formConfCopy.formBtns && formBtns.call(this, h)}
      </el-form>
    </el-row>
  )
}

function formBtns(h) {
  return <el-col>
    <el-form-item size="large">
      <el-button type="primary" onClick={this.submitForm}>提交</el-button>
      <el-button onClick={this.resetForm}>重置</el-button>
    </el-form-item>
  </el-col>
}

function renderFormItem(h, elementList) {
  return elementList.map(scheme => {
    const config = scheme.__config__
    const layout = layouts[config.layout]

    if (layout) {
      return layout.call(this, h, scheme)
    }
    throw new Error(`没有与${config.layout}匹配的layout`)
  })
}

function renderChildren(h, scheme) {
  const config = scheme.__config__
  if (!Array.isArray(config.children)) return null
  return renderFormItem.call(this, h, config.children)
}

function setValue(event, config, scheme) {
  console.log(event, config, scheme, 'this is setValue');
  this.$set(config, 'defaultValue', event)
  this.$set(this[this.formConf.formModel], scheme.__vModel__, event)
}

function buildListeners(scheme) {
  const config = scheme.__config__
  const methods = this.formConf.__methods__ || {}
  const listeners = {}

  // 给__methods__中的方法绑定this和event
  Object.keys(methods).forEach(key => {
    console.log(key);
    listeners[key] = event => methods[key].call(this, event)
  })
  // 响应 render.js 中的 vModel $emit('input', val)
  listeners.input = event => setValue.call(this, event, config, scheme)

  return listeners
}

export default {
  name: 'Parse',
  components: {
    render
  },
  props: {
    formConf: {
      type: Object,
      required: true
    }
  },
  data() {
    const data = {
      formConfCopy: deepClone(this.formConf),
      [this.formConf.formModel]: {},
      [this.formConf.formRules]: {}
    }
    this.initFormData(data.formConfCopy.fields, data[this.formConf.formModel])
    this.buildRules(data.formConfCopy.fields, data[this.formConf.formRules])
    return data
  },
  methods: {
    initFormData(componentList, formData) {
      componentList.forEach(cur => {
        const config = cur.__config__
        if (cur.__vModel__) formData[cur.__vModel__] = config.defaultValue
        if (config.children) this.initFormData(config.children, formData)
      })
    },
    buildRules(componentList, rules) {
      componentList.forEach(cur => {
        const config = cur.__config__
        if (Array.isArray(config.regList)) {
          if (config.required) {
            const required = { required: config.required, message: cur.placeholder }
            if (Array.isArray(config.defaultValue)) {
              required.type = 'array'
              required.message = `请至少选择一个${config.label}`
            }
            required.message === undefined && (required.message = `${config.label}不能为空`)
            config.regList.push(required)
          }
          rules[cur.__vModel__] = config.regList.map(item => {
            item.pattern && (item.pattern = eval(item.pattern))
            item.trigger = ruleTrigger && ruleTrigger[config.tag]
            return item
          })
        }
        if (config.children) this.buildRules(config.children, rules)
      })
    },
    resetForm() {
      this.formConfCopy = deepClone(this.formConf)
      this.$refs[this.formConf.formRef].resetFields()
    },
    submitForm() {
      this.$refs[this.formConf.formRef].validate(valid => {
        if (!valid) return false
        // 触发sumit事件
        this.$emit('submit', this[this.formConf.formModel])
        return true
      })
    }
  },
  render(h) {
    return renderFrom.call(this, h)
  }
}

[fwt11]

@zhangluJs 大佬，这个问题咋解决的？