Vue + element-ui实现动态表单项以及动态校验规则
情境
项目需要实现一个功能，表单中某个表单项产品id支持动态新增多个产品id表单项，每个产品id表单项都需要有校验规则，校验失败时各自有对应的校验提示
重点分析
- 表单对象内字段并非固定，需要根据交互动态新增
- 表单校验规则并非固定，需要根据字段新增动态新增对应校验规则
- 接口提交时并非提交多个产品id字段，需要将多个产品id文本字段整合为一个产品id数组字段
实现
核心：表单增加动态多个产品id字段以及产品id数组字段，产品id字段前缀相同，通过后缀序号区分不同字段，实际提交时整合字段为数组字段
1.模板语法
产品id数组字段的长度与产品id字段的个数始终保持一致
<el-form:model="addForm"label-suffix=":"label-width="120px":rules="rules"ref="form"
><el-col :span="12" v-for="(item, index) in addForm.superModelSkuIdList" :key="index"><el-form-item :label="formatSkuId(index)" :prop="'skuId' + index"><div class="skuId-item"><el-inputv-model.trim="addForm['skuId' + index]"placeholder="请输入产品id"maxlength="50"style="display: inline-block;"></el-input><istyle="display: inline-block;"class="el-icon-circle-plus-outline icon"@click="handleAddId"/></div></el-form-item></el-col>
</el-form>
2.核心逻辑
export default {data() {return {addForm: {// ...其他字段superModelSkuIdList: [''],},}},computed: {// 表单项动态变化，校验规则也需作为计算属性动态变化rules() {const checkSkuId = (rule, value, callback) => {// 产品id的校验逻辑}let staticRules = {// 其他字段的校验逻辑}let skuIdRules = {}let rule = [{validator: checkSkuId,trigger: 'blur',},]// 为每个产品id字段设置相同的校验逻辑this.addForm.superModelSkuIdList.forEach((item, index) => {skuIdRules['skuId' + index] = rule})return Object.assign(staticRules, skuIdRules)}},methods: {// 新增产品idhandleAddId() {this.addForm.superModelSkuIdList.push('')this.$set(this.addForm, 'skuId' + (this.addForm.superModelSkuIdList.length - 1), '')},// 根据产品id数组字段生成多个产品id字段createSkuIds() {// 使用this.$set保证新增对象字段具有响应性this.addForm.superModelSkuIdList.forEach((item, index) => {this.$set(this.addForm, 'skuId' + index, item)})},// 打开表单编辑弹窗时初始化产品id以及产品id数组字段openAddDialog(title, row = {}) {// ...其他逻辑this.addForm.superModelSkuIdList = [...row.superModelSkuIdList] || ['']this.createSkuIds()},// 需求中提交表单前需要清除产品id为空的项，清空后重新生成非空值的表单项clearEmptySkuId() {let list = []this.addForm.superModelSkuIdList.forEach((item, index) => {if(this.addForm['skuId' + index]) list.push(this.addForm['skuId' + index])delete this.addForm['skuId' + index]})this.addForm.superModelSkuIdList = listthis.createSkuIds()},// 接口提交时过滤掉所有产品id字段，仅需要产品id数组字段用于提交即可deleteSkuIds(skuInfo) {this.addForm.superModelSkuIdList.forEach((item, index) => {delete skuInfo['skuId' + index]})return skuInfo},// 表单提交submitForm() {this.$refs.form.validate((val) => {if (val) {this.clearEmptySkuId()let param = {skuInfo: this.deleteSkuIds({...this.addForm}),// ...其他参数}// ...执行提交相关逻辑}})},// 清空还原表单字段，去除产品id字段仅保留产品id数组字段resetForm() {this.addForm = {// ...其他字段superModelSkuIdList: [''],}},}
}
