手动实现一个form组件

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最近研究了一下element-ui，想着手动实现一下里面的form组件，贴个组件里面的代码

<el-form :model="ruleForm" status-icon :rules="rules" ref="ruleForm" label-width="100px" class="demo-ruleForm">

  <el-form-item label="密码" prop="pass">

    <el-input type="password" v-model="ruleForm.pass" autocomplete="off"></el-input>

  </el-form-item>

  <el-form-item label="确认密码" prop="checkPass">

    <el-input type="password" v-model="ruleForm.checkPass" autocomplete="off"></el-input>

  </el-form-item>

  <el-form-item label="年龄" prop="age">

    <el-input v-model.number="ruleForm.age"></el-input>

  </el-form-item>

  <el-form-item>

    <el-button type="primary" @click="submitForm('ruleForm')">提交</el-button>

    <el-button @click="resetForm('ruleForm')">重置</el-button>

  </el-form-item>

</el-form>

该组件可以细分为三个组件form，formItem以及input组件，首先介绍input组件

input组件：任务一是实现一个v-model的数据双绑定，即包含value的动态绑定以及input的实现

任务二是值发生改变的时候通知formItem组件

<template>

  <div>

    <input type="text" :value="value" @input="input">

  </div>

</template>

<script>

export default {

  props: {

    value: {

      type: String,

      default: ""

    }

  },

  methods: {

    input(e) {

      let inputValue = e.target.value;

      this.$emit("input", inputValue);

      this.$parent.$emit('validate');

    }

  }

};

</script>

<style lang="scss" scoped>

</style>

2. FormItem组件：任务一实现一个插槽

任务二显示label以及校验信息

任务三对数据进行校验

<template>

  <div>

    <label :prop="prop">{{label}}</label>

    <slot></slot>

    <p>{{error}}</p>

  </div>

</template>

<script>

//需要知道何时去校验

import Schema from "async-validator";

export default {

  inject: ["form"],

  props: {

    prop: {

      type: String,

      default: ""

    },

    label: {

      type: String,

      default: ""

    }

  },

  data() {

      return {

          error: ''

      }

  },

  methods: {

    validate() {

      const rules = this.form.rules[this.prop]; //数组

      const value = this.form.model[this.prop];

      const descriptor = { [this.prop]: rules };

      const schema = new Schema(descriptor);

      schema.validate({ [this.prop]: value }, errors => {

        if (errors) {

          this.error = errors[0].message;

        } else {

          this.error = "";

        }

      });

    }

  },

  mounted() {

    this.$on("validate", this.validate);

  }

};

</script>

<style lang="scss" scoped>

</style>

3. Form组件：任务实现rules和model的传递，预留插槽

<template>

  <div>

    <form>

      <slot></slot>

    </form>

  </div>

</template>

<script>

export default {

  provide() {

    return {

      form: this

    };

  },

  props: {

    rules: {

      type: Object

    },

    model: {

      type: Object

    }

  }

};

</script>

<style lang="scss" scoped>

</style>