quanyawei
2024-01-08 659d09ec24dab6c451220c8f3bb3943b0fdb3ba1
uni_modules/uview-ui/components/u-form/u-form.vue
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<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>