| <template> | 
|     <view class="u-form-item" :class="{'u-border-bottom': elBorderBottom, 'u-form-item__border-bottom--error': validateState === 'error' && showError('border-bottom')}"> | 
|         <view class="u-form-item__body" :style="{ | 
|             flexDirection: elLabelPosition == 'left' ? 'row' : 'column' | 
|         }"> | 
|             <!-- 微信小程序中,将一个参数设置空字符串,结果会变成字符串"true" --> | 
|             <view class="u-form-item--left" :style="{ | 
|                 width: uLabelWidth, | 
|                 flex: `0 0 ${uLabelWidth}`, | 
|                 marginBottom: elLabelPosition == 'left' ? 0 : '10rpx', | 
|             }"> | 
|                 <!-- 为了块对齐 --> | 
|                 <view class="u-form-item--left__content" v-if="required || leftIcon || label"> | 
|                     <!-- nvue不支持伪元素before --> | 
|                     <text v-if="required" class="u-form-item--left__content--required">*</text> | 
|                     <view class="u-form-item--left__content__icon" v-if="leftIcon"> | 
|                         <u-icon :name="leftIcon" :custom-style="leftIconStyle"></u-icon> | 
|                     </view> | 
|                     <view class="u-form-item--left__content__label" :style="[elLabelStyle, { | 
|                         'justify-content': elLabelAlign == 'left' ? 'flex-start' : elLabelAlign == 'center' ? 'center' : 'flex-end' | 
|                     }]"> | 
|                         {{label}} | 
|                     </view> | 
|                 </view> | 
|             </view> | 
|             <view class="u-form-item--right u-flex"> | 
|                 <view class="u-form-item--right__content"> | 
|                     <view class="u-form-item--right__content__slot "> | 
|                         <slot /> | 
|                     </view> | 
|                     <view class="u-form-item--right__content__icon u-flex" v-if="$slots.right || rightIcon"> | 
|                         <u-icon :custom-style="rightIconStyle" v-if="rightIcon" :name="rightIcon"></u-icon> | 
|                         <slot name="right" /> | 
|                     </view> | 
|                 </view> | 
|             </view> | 
|         </view> | 
|         <view class="u-form-item__message" v-if="validateState === 'error' && showError('message')" :style="{ | 
|             paddingLeft: elLabelPosition == 'left' ? $u.addUnit(elLabelWidth) : '0', | 
|         }">{{validateMessage}}</view> | 
|     </view> | 
| </template> | 
|   | 
| <script> | 
|     import Emitter from '../../libs/util/emitter.js'; | 
|     import schema from '../../libs/util/async-validator'; | 
|     // 去除警告信息 | 
|     schema.warning = function() {}; | 
|   | 
|     /** | 
|      * form-item 表单item | 
|      * @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 http://uviewui.com/components/form.html | 
|      * @property {String} label 左侧提示文字 | 
|      * @property {Object} prop 表单域model对象的属性名,在使用 validate、resetFields 方法的情况下,该属性是必填的 | 
|      * @property {Boolean} border-bottom 是否显示表单域的下划线边框 | 
|      * @property {String} label-position 表单域提示文字的位置,left-左侧,top-上方 | 
|      * @property {String Number} label-width 提示文字的宽度,单位rpx(默认90) | 
|      * @property {Object} label-style lable的样式,对象形式 | 
|      * @property {String} label-align lable的对齐方式 | 
|      * @property {String} right-icon 右侧自定义字体图标(限uView内置图标)或图片地址 | 
|      * @property {String} left-icon 左侧自定义字体图标(限uView内置图标)或图片地址 | 
|      * @property {Object} left-icon-style 左侧图标的样式,对象形式 | 
|      * @property {Object} right-icon-style 右侧图标的样式,对象形式 | 
|      * @property {Boolean} required 是否显示左边的"*"号,这里仅起展示作用,如需校验必填,请通过rules配置必填规则(默认false) | 
|      * @example <u-form-item label="姓名"><u-input v-model="form.name" /></u-form-item> | 
|      */ | 
|   | 
|     export default { | 
|         name: 'u-form-item', | 
|         mixins: [Emitter], | 
|         inject: { | 
|             uForm: { | 
|                 default () { | 
|                     return null | 
|                 } | 
|             } | 
|         }, | 
|         props: { | 
|             // input的label提示语 | 
|             label: { | 
|                 type: String, | 
|                 default: '' | 
|             }, | 
|             // 绑定的值 | 
|             prop: { | 
|                 type: String, | 
|                 default: '' | 
|             }, | 
|             // 是否显示表单域的下划线边框 | 
|             borderBottom: { | 
|                 type: [String, Boolean], | 
|                 default: '' | 
|             }, | 
|             // label的位置,left-左边,top-上边 | 
|             labelPosition: { | 
|                 type: String, | 
|                 default: '' | 
|             }, | 
|             // label的宽度,单位rpx | 
|             labelWidth: { | 
|                 type: [String, Number], | 
|                 default: '' | 
|             }, | 
|             // lable的样式,对象形式 | 
|             labelStyle: { | 
|                 type: Object, | 
|                 default () { | 
|                     return {} | 
|                 } | 
|             }, | 
|             // lable字体的对齐方式 | 
|             labelAlign: { | 
|                 type: String, | 
|                 default: '' | 
|             }, | 
|             // 右侧图标 | 
|             rightIcon: { | 
|                 type: String, | 
|                 default: '' | 
|             }, | 
|             // 左侧图标 | 
|             leftIcon: { | 
|                 type: String, | 
|                 default: '' | 
|             }, | 
|             // 左侧图标的样式 | 
|             leftIconStyle: { | 
|                 type: Object, | 
|                 default () { | 
|                     return {} | 
|                 } | 
|             }, | 
|             // 左侧图标的样式 | 
|             rightIconStyle: { | 
|                 type: Object, | 
|                 default () { | 
|                     return {} | 
|                 } | 
|             }, | 
|             // 是否显示左边的必填星号,只作显示用,具体校验必填的逻辑,请在rules中配置 | 
|             required: { | 
|                 type: Boolean, | 
|                 default: false | 
|             } | 
|         }, | 
|         data() { | 
|             return { | 
|                 initialValue: '', // 存储的默认值 | 
|                 // isRequired: false, // 是否必填,由于人性化考虑,必填"*"号通过props的required配置,不再通过rules的规则自动生成 | 
|                 validateState: '', // 是否校验成功 | 
|                 validateMessage: '', // 校验失败的提示语 | 
|                 // 有错误时的提示方式,message-提示信息,border-如果input设置了边框,变成呈红色, | 
|                 errorType: ['message'], | 
|                 fieldValue: '', // 获取当前子组件input的输入的值 | 
|                 // 父组件的参数,在computed计算中,无法得知this.parent发生变化,故将父组件的参数值,放到data中 | 
|                 parentData: { | 
|                     borderBottom: true, | 
|                     labelWidth: 90, | 
|                     labelPosition: 'left', | 
|                     labelStyle: {}, | 
|                     labelAlign: 'left', | 
|                 } | 
|             }; | 
|         }, | 
|         watch: { | 
|             validateState(val) { | 
|                 this.broadcastInputError(); | 
|             }, | 
|             // 监听u-form组件的errorType的变化 | 
|             "uForm.errorType"(val) { | 
|                 this.errorType = val; | 
|                 this.broadcastInputError(); | 
|             }, | 
|         }, | 
|         computed: { | 
|             // 计算后的label宽度,由于需要多个判断,故放到computed中 | 
|             uLabelWidth() { | 
|                 // 如果用户设置label为空字符串(微信小程序空字符串最终会变成字符串的'true'),意味着要将label的位置宽度设置为auto | 
|                 return this.elLabelPosition == 'left' ? (this.label === 'true' || this.label === '' ? 'auto' : this.$u.addUnit(this | 
|                     .elLabelWidth)) : '100%'; | 
|             }, | 
|             showError() { | 
|                 return type => { | 
|                     // 如果errorType数组中含有none,或者toast提示类型 | 
|                     if (this.errorType.indexOf('none') >= 0) return false; | 
|                     else if (this.errorType.indexOf(type) >= 0) return true; | 
|                     else return false; | 
|                 } | 
|             }, | 
|             // label的宽度 | 
|             elLabelWidth() { | 
|                 // label默认宽度为90,优先使用本组件的值,如果没有(如果设置为0,也算是配置了值,依然起效),则用u-form的值 | 
|                 return (this.labelWidth != 0 || this.labelWidth != '') ? this.labelWidth : (this.parentData.labelWidth ? this.parentData | 
|                     .labelWidth : | 
|                     90); | 
|             }, | 
|             // label的样式 | 
|             elLabelStyle() { | 
|                 return Object.keys(this.labelStyle).length ? this.labelStyle : (this.parentData.labelStyle ? this.parentData.labelStyle : | 
|                     {}); | 
|             }, | 
|             // label的位置,左侧或者上方 | 
|             elLabelPosition() { | 
|                 return this.labelPosition ? this.labelPosition : (this.parentData.labelPosition ? this.parentData.labelPosition : | 
|                     'left'); | 
|             }, | 
|             // label的对齐方式 | 
|             elLabelAlign() { | 
|                 return this.labelAlign ? this.labelAlign : (this.parentData.labelAlign ? this.parentData.labelAlign : 'left'); | 
|             }, | 
|             // label的下划线 | 
|             elBorderBottom() { | 
|                 // 子组件的borderBottom默认为空字符串,如果不等于空字符串,意味着子组件设置了值,优先使用子组件的值 | 
|                 return this.borderBottom !== '' ? this.borderBottom : this.parentData.borderBottom ? this.parentData.borderBottom : | 
|                     true; | 
|             } | 
|         }, | 
|         methods: { | 
|             broadcastInputError() { | 
|                 // 子组件发出事件,第三个参数为true或者false,true代表有错误 | 
|                 this.broadcast('u-input', 'on-form-item-error', this.validateState === 'error' && this.showError('border')); | 
|             }, | 
|             // 判断是否需要required校验 | 
|             setRules() { | 
|                 let that = this; | 
|                 // 由于人性化考虑,必填"*"号通过props的required配置,不再通过rules的规则自动生成 | 
|                 // 从父组件u-form拿到当前u-form-item需要验证 的规则 | 
|                 // let rules = this.getRules(); | 
|                 // if (rules.length) { | 
|                 //     this.isRequired = rules.some(rule => { | 
|                 //         // 如果有必填项,就返回,没有的话,就是undefined | 
|                 //         return rule.required; | 
|                 //     }); | 
|                 // } | 
|   | 
|                 // blur事件 | 
|                 this.$on('on-form-blur', that.onFieldBlur); | 
|                 // change事件 | 
|                 this.$on('on-form-change', that.onFieldChange); | 
|             }, | 
|   | 
|             // 从u-form的rules属性中,取出当前u-form-item的校验规则 | 
|             getRules() { | 
|                 // 父组件的所有规则 | 
|                 let rules = this.parent.rules; | 
|                 rules = rules ? rules[this.prop] : []; | 
|                 // 保证返回的是一个数组形式 | 
|                 return [].concat(rules || []); | 
|             }, | 
|   | 
|             // blur事件时进行表单校验 | 
|             onFieldBlur() { | 
|                 this.validation('blur'); | 
|             }, | 
|   | 
|             // change事件进行表单校验 | 
|             onFieldChange() { | 
|                 this.validation('change'); | 
|             }, | 
|   | 
|             // 过滤出符合要求的rule规则 | 
|             getFilteredRule(triggerType = '') { | 
|                 let rules = this.getRules(); | 
|                 // 整体验证表单时,triggerType为空字符串,此时返回所有规则进行验证 | 
|                 if (!triggerType) return rules; | 
|                 // 历遍判断规则是否有对应的事件,比如blur,change触发等的事件 | 
|                 // 使用indexOf判断,是因为某些时候设置的验证规则的trigger属性可能为多个,比如['blur','change'] | 
|                 // 某些场景可能的判断规则,可能不存在trigger属性,故先判断是否存在此属性 | 
|                 return rules.filter(res => res.trigger && res.trigger.indexOf(triggerType) !== -1); | 
|             }, | 
|   | 
|             // 校验数据 | 
|             validation(trigger, callback = () => {}) { | 
|                 // 检验之间,先获取需要校验的值 | 
|                 this.fieldValue = this.parent.model[this.prop]; | 
|                 // blur和change是否有当前方式的校验规则 | 
|                 let rules = this.getFilteredRule(trigger); | 
|                 // 判断是否有验证规则,如果没有规则,也调用回调方法,否则父组件u-form会因为 | 
|                 // 对count变量的统计错误而无法进入上一层的回调 | 
|                 if (!rules || rules.length === 0) { | 
|                     return callback(''); | 
|                 } | 
|                 // 设置当前的装填,标识为校验中 | 
|                 this.validateState = 'validating'; | 
|                 // 调用async-validator的方法 | 
|                 let validator = new schema({ | 
|                     [this.prop]: rules | 
|                 }); | 
|                 validator.validate({ | 
|                     [this.prop]: this.fieldValue | 
|                 }, { | 
|                     firstFields: true | 
|                 }, (errors, fields) => { | 
|                     // 记录状态和报错信息 | 
|                     this.validateState = !errors ? 'success' : 'error'; | 
|                     this.validateMessage = errors ? errors[0].message : ''; | 
|                     // 调用回调方法 | 
|                     callback(this.validateMessage); | 
|                 }); | 
|             }, | 
|   | 
|             // 清空当前的u-form-item | 
|             resetField() { | 
|                 this.parent.model[this.prop] = this.initialValue; | 
|                 // 设置为`success`状态,只是为了清空错误标记 | 
|                 this.validateState = 'success'; | 
|             } | 
|         }, | 
|   | 
|         // 组件创建完成时,将当前实例保存到u-form中 | 
|         mounted() { | 
|             // 支付宝、头条小程序不支持provide/inject,所以使用这个方法获取整个父组件,在created定义,避免循环应用 | 
|             this.parent = this.$u.$parent.call(this, 'u-form'); | 
|             if (this.parent) { | 
|                 // 历遍parentData中的属性,将parent中的同名属性赋值给parentData | 
|                 Object.keys(this.parentData).map(key => { | 
|                     this.parentData[key] = this.parent[key]; | 
|                 }); | 
|                 // 如果没有传入prop,或者uForm为空(如果u-form-input单独使用,就不会有uForm注入),就不进行校验 | 
|                 if (this.prop) { | 
|                     // 将本实例添加到父组件中 | 
|                     this.parent.fields.push(this); | 
|                     this.errorType = this.parent.errorType; | 
|                     // 设置初始值 | 
|                     this.initialValue = this.fieldValue; | 
|                     // 添加表单校验,这里必须要写在$nextTick中,因为u-form的rules是通过ref手动传入的 | 
|                     // 不在$nextTick中的话,可能会造成执行此处代码时,父组件还没通过ref把规则给u-form,导致规则为空 | 
|                     this.$nextTick(() => { | 
|                         this.setRules(); | 
|                     }) | 
|                 } | 
|             } | 
|         }, | 
|   | 
|         // 组件销毁前,将实例从u-form的缓存中移除 | 
|         beforeDestroy() { | 
|             // 如果当前没有prop的话表示当前不要进行删除(因为没有注入) | 
|             if (this.parent && this.prop) { | 
|                 this.parent.fields.map((item, index) => { | 
|                     if (item === this) this.parent.fields.splice(index, 1); | 
|                 }) | 
|             } | 
|         }, | 
|     }; | 
| </script> | 
|   | 
| <style lang="scss" scoped> | 
|     @import "../../libs/css/style.components.scss"; | 
|   | 
|     .u-form-item { | 
|         @include vue-flex; | 
|         // align-items: flex-start; | 
|         padding: 20rpx 0; | 
|         font-size: 28rpx; | 
|         color: $u-main-color; | 
|         box-sizing: border-box; | 
|         line-height: $u-form-item-height; | 
|         flex-direction: column; | 
|   | 
|         &__border-bottom--error:after { | 
|             border-color: $u-type-error; | 
|         } | 
|   | 
|         &__body { | 
|             @include vue-flex; | 
|         } | 
|   | 
|         &--left { | 
|             @include vue-flex; | 
|             align-items: center; | 
|   | 
|             &__content { | 
|                 position: relative; | 
|                 @include vue-flex; | 
|                 align-items: center; | 
|                 padding-right: 10rpx; | 
|                 flex: 1; | 
|   | 
|                 &__icon { | 
|                     margin-right: 8rpx; | 
|                 } | 
|   | 
|                 &--required { | 
|                     position: absolute; | 
|                     left: -16rpx; | 
|                     vertical-align: middle; | 
|                     color: $u-type-error; | 
|                     padding-top: 6rpx; | 
|                 } | 
|   | 
|                 &__label { | 
|                     @include vue-flex; | 
|                     align-items: center; | 
|                     flex: 1; | 
|                 } | 
|             } | 
|         } | 
|   | 
|         &--right { | 
|             flex: 1; | 
|   | 
|             &__content { | 
|                 @include vue-flex; | 
|                 align-items: center; | 
|                 flex: 1; | 
|   | 
|                 &__slot { | 
|                     flex: 1; | 
|                     /* #ifndef MP */ | 
|                     @include vue-flex; | 
|                     align-items: center; | 
|                     /* #endif */ | 
|                 } | 
|   | 
|                 &__icon { | 
|                     margin-left: 10rpx; | 
|                     color: $u-light-color; | 
|                     font-size: 30rpx; | 
|                 } | 
|             } | 
|         } | 
|   | 
|         &__message { | 
|             font-size: 24rpx; | 
|             line-height: 24rpx; | 
|             color: $u-type-error; | 
|             margin-top: 12rpx; | 
|         } | 
|     } | 
| </style> |