<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>  
 |