<template>
<form class="v-form">
<slot></slot>
</form>
</template>
<script>
import AsyncValidator from 'async-validator'
export default {
name: 'v-form',
componentName: 'VForm', // 通过 $options.componentName 来找 form 组件
data () {
return {
fields: [], // field: {prop, el}，保存 FormItem 的信息。
formError: {}
}
},
computed: {
formRules () {
const descriptor = {}
this.fields.forEach(({prop}) => {
if (!Array.isArray(this.rules[prop])) {
console.warn(`prop 为 ${prop} 的 FormItem 校验规则不存在或者其值不是数组`)
descriptor[prop] = [{ required: true }] return
}
descriptor[prop] = this.rules[prop] })
return descriptor
},
formValues () {
return this.fields.reduce((data, {prop}) => {
data[prop] = this.model[prop] return data
}, {})
}
},
methods: {
validate (callback) {
const validator = new AsyncValidator(this.formRules)
validator.validate(this.formValues, (errors) => {
let formError = {}
if (errors && errors.length) {
errors.forEach(({message, field}) => {
formError[field] = message
})
} else {
formError = {}
}
this.formError = formError
// 让错误信息的顺序与表单组件的顺序相同
const errInfo = [] this.fields.forEach(({prop, el}, index) => {
if (formError[prop]) {
errInfo.push(formError[prop])
}
})
callback(errInfo)
})
}
},
props: {
model: Object,
rules: Object
},
created () {
this.$on('form.addField', (field) => {
if (field) {
this.fields = [...this.fields, field] }
})
this.$on('form.removeField', (field) => {
if (field) {
this.fields = this.fields.filter(({prop}) => prop !== field.prop)
}
})
}
}
</script>
FormItem 组件
FormItem 组件就简单很多，首先要向上找到包含它的 Form 组件。接下来就可以根据 formError 计算出对应的错误信息。
<template>
<div class="form-item">
<label :for="prop" class="form-item-label" v-if="label">
{{ label }}
</label>
<div class="form-item-content">
<slot></slot>
</div>
</div>
</template>
<script>
export default {
name: 'form-item',
computed: {
form () {
let parent = this.$parent
while (parent.$options.componentName !== 'VForm') {
parent = parent.$parent
}
return parent
