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