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<template>
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<view class="u-form-item" :class="{'u-border-bottom': elBorderBottom, 'u-form-item__border-bottom--error': validateState === 'error' && showError('border-bottom')}">
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<view class="u-form-item__body" :style="{
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flexDirection: elLabelPosition == 'left' ? 'row' : 'column'
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}">
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<!-- 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" -->
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<view class="u-form-item--left" :style="{
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width: uLabelWidth,
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flex: `0 0 ${uLabelWidth}`,
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marginBottom: elLabelPosition == 'left' ? 0 : '10rpx',
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}">
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<!-- 为了块对齐 -->
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<view class="u-form-item--left__content" v-if="required || leftIcon || label">
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<!-- nvue不支持伪元素before -->
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<text v-if="required" class="u-form-item--left__content--required">*</text>
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<view class="u-form-item--left__content__icon" v-if="leftIcon">
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<u-icon :name="leftIcon" :custom-style="leftIconStyle"></u-icon>
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</view>
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<view class="u-form-item--left__content__label" :style="[elLabelStyle, {
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'justify-content': elLabelAlign == 'left' ? 'flex-start' : elLabelAlign == 'center' ? 'center' : 'flex-end'
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}]">
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{{label}}
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</view>
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</view>
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</view>
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<view class="u-form-item--right u-flex">
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<view class="u-form-item--right__content">
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<view class="u-form-item--right__content__slot ">
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<slot />
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</view>
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<view class="u-form-item--right__content__icon u-flex" v-if="$slots.right || rightIcon">
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<u-icon :custom-style="rightIconStyle" v-if="rightIcon" :name="rightIcon"></u-icon>
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<slot name="right" />
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</view>
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</view>
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</view>
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</view>
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<view class="u-form-item__message" v-if="validateState === 'error' && showError('message')" :style="{
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paddingLeft: elLabelPosition == 'left' ? $u.addUnit(elLabelWidth) : '0',
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}">{{validateMessage}}</view>
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</view>
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</template>
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<script>
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import Emitter from '../../libs/util/emitter.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-item 表单item
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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 http://uviewui.com/components/form.html
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* @property {String} label 左侧提示文字
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* @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
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* @property {Boolean} border-bottom 是否显示表单域的下划线边框
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* @property {String} label-position 表单域提示文字的位置，left-左侧，top-上方
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* @property {String Number} label-width 提示文字的宽度，单位rpx（默认90）
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* @property {Object} label-style lable的样式，对象形式
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* @property {String} label-align lable的对齐方式
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* @property {String} right-icon 右侧自定义字体图标(限uView内置图标)或图片地址
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* @property {String} left-icon 左侧自定义字体图标(限uView内置图标)或图片地址
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* @property {Object} left-icon-style 左侧图标的样式，对象形式
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* @property {Object} right-icon-style 右侧图标的样式，对象形式
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* @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)
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* @example <u-form-item label="姓名"><u-input v-model="form.name" /></u-form-item>
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*/
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export default {
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name: 'u-form-item',
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mixins: [Emitter],
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inject: {
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uForm: {
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default () {
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return null
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}
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}
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},
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props: {
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// input的label提示语
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label: {
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type: String,
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default: ''
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},
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// 绑定的值
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prop: {
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type: String,
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default: ''
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},
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// 是否显示表单域的下划线边框
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borderBottom: {
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type: [String, Boolean],
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default: ''
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},
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// label的位置，left-左边，top-上边
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labelPosition: {
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type: String,
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default: ''
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},
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// label的宽度，单位rpx
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labelWidth: {
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type: [String, Number],
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default: ''
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},
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// lable的样式，对象形式
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labelStyle: {
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type: Object,
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default () {
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return {}
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}
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},
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// lable字体的对齐方式
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labelAlign: {
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type: String,
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default: ''
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},
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// 右侧图标
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rightIcon: {
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type: String,
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default: ''
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},
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// 左侧图标
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leftIcon: {
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type: String,
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default: ''
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},
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// 左侧图标的样式
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leftIconStyle: {
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type: Object,
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default () {
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return {}
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}
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},
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// 左侧图标的样式
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rightIconStyle: {
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type: Object,
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default () {
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return {}
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}
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},
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// 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
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required: {
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type: Boolean,
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default: false
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}
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},
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data() {
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return {
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initialValue: '', // 存储的默认值
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// 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
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validateState: '', // 是否校验成功
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validateMessage: '', // 校验失败的提示语
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// 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，
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errorType: ['message'],
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fieldValue: '', // 获取当前子组件input的输入的值
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// 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
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parentData: {
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borderBottom: true,
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labelWidth: 90,
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labelPosition: 'left',
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labelStyle: {},
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labelAlign: 'left',
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}
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};
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},
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watch: {
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validateState(val) {
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this.broadcastInputError();
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},
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// 监听u-form组件的errorType的变化
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"uForm.errorType"(val) {
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this.errorType = val;
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this.broadcastInputError();
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},
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},
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computed: {
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// 计算后的label宽度，由于需要多个判断，故放到computed中
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uLabelWidth() {
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// 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
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return this.elLabelPosition == 'left' ? (this.label === 'true' || this.label === '' ? 'auto' : this.$u.addUnit(this
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.elLabelWidth)) : '100%';
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},
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showError() {
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return type => {
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// 如果errorType数组中含有none，或者toast提示类型
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if (this.errorType.indexOf('none') >= 0) return false;
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else if (this.errorType.indexOf(type) >= 0) return true;
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else return false;
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}
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},
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// label的宽度
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elLabelWidth() {
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// 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
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return (this.labelWidth != 0 || this.labelWidth != '') ? this.labelWidth : (this.parentData.labelWidth ? this.parentData
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.labelWidth :
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90);
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},
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// label的样式
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elLabelStyle() {
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return Object.keys(this.labelStyle).length ? this.labelStyle : (this.parentData.labelStyle ? this.parentData.labelStyle :
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{});
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},
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// label的位置，左侧或者上方
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elLabelPosition() {
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return this.labelPosition ? this.labelPosition : (this.parentData.labelPosition ? this.parentData.labelPosition :
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'left');
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},
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// label的对齐方式
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elLabelAlign() {
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return this.labelAlign ? this.labelAlign : (this.parentData.labelAlign ? this.parentData.labelAlign : 'left');
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},
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// label的下划线
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elBorderBottom() {
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// 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
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return this.borderBottom !== '' ? this.borderBottom : this.parentData.borderBottom ? this.parentData.borderBottom :
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true;
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}
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},
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methods: {
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broadcastInputError() {
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// 子组件发出事件，第三个参数为true或者false，true代表有错误
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this.broadcast('u-input', 'on-form-item-error', this.validateState === 'error' && this.showError('border'));
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},
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// 判断是否需要required校验
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setRules() {
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let that = this;
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// 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
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// 从父组件u-form拿到当前u-form-item需要验证 的规则
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// let rules = this.getRules();
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// if (rules.length) {
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// this.isRequired = rules.some(rule => {
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// // 如果有必填项，就返回，没有的话，就是undefined
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// return rule.required;
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// });
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// }
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// blur事件
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this.$on('on-form-blur', that.onFieldBlur);
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// change事件
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this.$on('on-form-change', that.onFieldChange);
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},
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// 从u-form的rules属性中，取出当前u-form-item的校验规则
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getRules() {
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// 父组件的所有规则
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let rules = this.parent.rules;
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rules = rules ? rules[this.prop] : [];
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// 保证返回的是一个数组形式
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return [].concat(rules || []);
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},
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// blur事件时进行表单校验
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onFieldBlur() {
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this.validation('blur');
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},
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// change事件进行表单校验
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onFieldChange() {
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this.validation('change');
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},
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// 过滤出符合要求的rule规则
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getFilteredRule(triggerType = '') {
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let rules = this.getRules();
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// 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
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if (!triggerType) return rules;
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// 历遍判断规则是否有对应的事件，比如blur，change触发等的事件
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// 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']
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|
// 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
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|
return rules.filter(res => res.trigger && res.trigger.indexOf(triggerType) !== -1);
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},
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// 校验数据
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|
|
validation(trigger, callback = () => {}) {
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|
// 检验之间，先获取需要校验的值
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|
this.fieldValue = this.parent.model[this.prop];
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// blur和change是否有当前方式的校验规则
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|
let rules = this.getFilteredRule(trigger);
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// 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
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|
// 对count变量的统计错误而无法进入上一层的回调
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|
|
if (!rules || rules.length === 0) {
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|
|
return callback('');
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|
}
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|
// 设置当前的装填，标识为校验中
|
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|
|
this.validateState = 'validating';
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|
|
|
// 调用async-validator的方法
|
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|
|
|
|
let validator = new schema({
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|
|
[this.prop]: rules
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|
|
});
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|
|
validator.validate({
|
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|
|
[this.prop]: this.fieldValue
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|
}, {
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|
|
firstFields: true
|
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|
|
}, (errors, fields) => {
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|
|
// 记录状态和报错信息
|
|
|
|
|
|
this.validateState = !errors ? 'success' : 'error';
|
|
|
|
|
|
this.validateMessage = errors ? errors[0].message : '';
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|
|
|
// 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>
|
