| <template>  | 
|     <view class="u-form">  | 
|         <slot />  | 
|     </view>  | 
| </template>  | 
|   | 
| <script>  | 
|     import props from "./props.js";  | 
|     import Schema from "../../libs/util/async-validator";  | 
|     // 去除警告信息  | 
|     Schema.warning = function() {};  | 
|     /**  | 
|      * Form 表单  | 
|      * @description 此组件一般用于表单场景,可以配置Input输入框,Select弹出框,进行表单验证等。  | 
|      * @tutorial https://www.uviewui.com/components/form.html  | 
|      * @property {Object}                        model            当前form的需要验证字段的集合  | 
|      * @property {Object | Function | Array}    rules            验证规则  | 
|      * @property {String}                        errorType        错误的提示方式,见上方说明 ( 默认 message )  | 
|      * @property {Boolean}                        borderBottom    是否显示表单域的下划线边框   ( 默认 true )  | 
|      * @property {String}                        labelPosition    表单域提示文字的位置,left-左侧,top-上方 ( 默认 'left' )  | 
|      * @property {String | Number}                labelWidth        提示文字的宽度,单位px  ( 默认 45 )  | 
|      * @property {String}                        labelAlign        lable字体的对齐方式   ( 默认 ‘left' )  | 
|      * @property {Object}                        labelStyle        lable的样式,对象形式  | 
|      * @example <u--formlabelPosition="left" :model="model1" :rules="rules" ref="form1"></u--form>  | 
|      */  | 
|     export default {  | 
|         name: "u-form",  | 
|         mixins: [uni.$u.mpMixin, uni.$u.mixin, props],  | 
|         provide() {  | 
|             return {  | 
|                 uForm: this,  | 
|             };  | 
|         },  | 
|         data() {  | 
|             return {  | 
|                 formRules: {},  | 
|                 // 规则校验器  | 
|                 validator: {},  | 
|                 // 原始的model快照,用于resetFields方法重置表单时使用  | 
|                 originalModel: null,  | 
|             };  | 
|         },  | 
|         watch: {  | 
|             // 监听规则的变化  | 
|             rules: {  | 
|                 immediate: true,  | 
|                 handler(n) {  | 
|                     this.setRules(n);  | 
|                 },  | 
|             },  | 
|             // 监听属性的变化,通知子组件u-form-item重新获取信息  | 
|             propsChange(n) {  | 
|                 if (this.children?.length) {  | 
|                     this.children.map((child) => {  | 
|                         // 判断子组件(u-form-item)如果有updateParentData方法的话,就就执行(执行的结果是子组件重新从父组件拉取了最新的值)  | 
|                         typeof child.updateParentData == "function" &&  | 
|                             child.updateParentData();  | 
|                     });  | 
|                 }  | 
|             },  | 
|             // 监听model的初始值作为重置表单的快照  | 
|             model: {  | 
|                 immediate: true,  | 
|                 handler(n) {  | 
|                     if (!this.originalModel) {  | 
|                         this.originalModel = uni.$u.deepClone(n);  | 
|                     }  | 
|                 },  | 
|             },  | 
|         },  | 
|         computed: {  | 
|             propsChange() {  | 
|                 return [  | 
|                     this.errorType,  | 
|                     this.borderBottom,  | 
|                     this.labelPosition,  | 
|                     this.labelWidth,  | 
|                     this.labelAlign,  | 
|                     this.labelStyle,  | 
|                 ];  | 
|             },  | 
|         },  | 
|         created() {  | 
|             // 存储当前form下的所有u-form-item的实例  | 
|             // 不能定义在data中,否则微信小程序会造成循环引用而报错  | 
|             this.children = [];  | 
|         },  | 
|         methods: {  | 
|             // 手动设置校验的规则,如果规则中有函数的话,微信小程序中会过滤掉,所以只能手动调用设置规则  | 
|             setRules(rules) {  | 
|                 // 判断是否有规则  | 
|                 if (Object.keys(rules).length === 0) return; | 
|                 if (process.env.NODE_ENV === 'development' && Object.keys(this.model).length === 0) { | 
|                     uni.$u.error('设置rules,model必须设置!如果已经设置,请刷新页面。'); | 
|                     return; | 
|                 };  | 
|                 this.formRules = rules;  | 
|                 // 重新将规则赋予Validator  | 
|                 this.validator = new Schema(rules);  | 
|             },  | 
|             // 清空所有u-form-item组件的内容,本质上是调用了u-form-item组件中的resetField()方法  | 
|             resetFields() {  | 
|                 this.resetModel();  | 
|             },  | 
|             // 重置model为初始值的快照  | 
|             resetModel(obj) {  | 
|                 // 历遍所有u-form-item,根据其prop属性,还原model的原始快照  | 
|                 this.children.map((child) => {  | 
|                     const prop = child?.prop;  | 
|                     const value = uni.$u.getProperty(this.originalModel, prop);  | 
|                     uni.$u.setProperty(this.model, prop, value);  | 
|                 });  | 
|             },  | 
|             // 清空校验结果  | 
|             clearValidate(props) {  | 
|                 props = [].concat(props);  | 
|                 this.children.map((child) => {  | 
|                     // 如果u-form-item的prop在props数组中,则清除对应的校验结果信息  | 
|                     if (props[0] === undefined || props.includes(child.prop)) {  | 
|                         child.message = null;  | 
|                     }  | 
|                 });  | 
|             },  | 
|             // 对部分表单字段进行校验  | 
|             async validateField(value, callback, event = null) {  | 
|                 // $nextTick是必须的,否则model的变更,可能会延后于此方法的执行  | 
|                 this.$nextTick(() => {  | 
|                     // 校验错误信息,返回给回调方法,用于存放所有form-item的错误信息  | 
|                     const errorsRes = [];  | 
|                     // 如果为字符串,转为数组  | 
|                     value = [].concat(value);  | 
|                     // 历遍children所有子form-item  | 
|                     this.children.map((child) => {  | 
|                         // 用于存放form-item的错误信息  | 
|                         const childErrors = [];  | 
|                         if (value.includes(child.prop)) {  | 
|                             // 获取对应的属性,通过类似'a.b.c'的形式  | 
|                             const propertyVal = uni.$u.getProperty(  | 
|                                 this.model,  | 
|                                 child.prop  | 
|                             );  | 
|                             // 属性链数组  | 
|                             const propertyChain = child.prop.split(".");  | 
|                             const propertyName =  | 
|                                 propertyChain[propertyChain.length - 1];  | 
|   | 
|                             const rule = this.formRules[child.prop];  | 
|                             // 如果不存在对应的规则,直接返回,否则校验器会报错  | 
|                             if (!rule) return;  | 
|                             // rule规则可为数组形式,也可为对象形式,此处拼接成为数组  | 
|                             const rules = [].concat(rule);  | 
|   | 
|                             // 对rules数组进行校验  | 
|                             for (let i = 0; i < rules.length; i++) {  | 
|                                 const ruleItem = rules[i];  | 
|                                 // 将u-form-item的触发器转为数组形式  | 
|                                 const trigger = [].concat(ruleItem?.trigger);  | 
|                                 // 如果是有传入触发事件,但是此form-item却没有配置此触发器的话,不执行校验操作  | 
|                                 if (event && !trigger.includes(event)) continue;  | 
|                                 // 实例化校验对象,传入构造规则  | 
|                                 const validator = new Schema({  | 
|                                     [propertyName]: ruleItem,  | 
|                                 });  | 
|                                 validator.validate({  | 
|                                         [propertyName]: propertyVal,  | 
|                                     },  | 
|                                     (errors, fields) => {  | 
|                                         if (uni.$u.test.array(errors)) {  | 
|                                             errorsRes.push(...errors);  | 
|                                             childErrors.push(...errors);  | 
|                                         }  | 
|                                         child.message =  | 
|                                             childErrors[0]?.message ?? null;  | 
|                                     }  | 
|                                 );  | 
|                             }  | 
|                         }  | 
|                     });  | 
|                     // 执行回调函数  | 
|                     typeof callback === "function" && callback(errorsRes);  | 
|                 });  | 
|             },  | 
|             // 校验全部数据  | 
|             validate(callback) { | 
|                 // 开发环境才提示,生产环境不会提示 | 
|                 if (process.env.NODE_ENV === 'development' && Object.keys(this.formRules).length === 0) { | 
|                     uni.$u.error('未设置rules,请看文档说明!如果已经设置,请刷新页面。'); | 
|                     return; | 
|                 }  | 
|                 return new Promise((resolve, reject) => {  | 
|                     // $nextTick是必须的,否则model的变更,可能会延后于validate方法  | 
|                     this.$nextTick(() => {  | 
|                         // 获取所有form-item的prop,交给validateField方法进行校验  | 
|                         const formItemProps = this.children.map(  | 
|                             (item) => item.prop  | 
|                         );  | 
|                         this.validateField(formItemProps, (errors) => {  | 
|                             if(errors.length) {  | 
|                                 // 如果错误提示方式为toast,则进行提示  | 
|                                 this.errorType === 'toast' && uni.$u.toast(errors[0].message)  | 
|                                 reject(errors)  | 
|                             } else {  | 
|                                 resolve(true)  | 
|                             }  | 
|                         });  | 
|                     });  | 
|                 });  | 
|             },  | 
|         },  | 
|     };  | 
| </script>  | 
|   | 
| <style lang="scss" scoped>  | 
| </style>  |