<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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            <!-- 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="{ 
 | 
                width: uLabelWidth, 
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                flex: `0 0 ${uLabelWidth}`, 
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                marginBottom: elLabelPosition == 'left' ? 0 : '10rpx', 
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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"> 
 | 
                    <!-- 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> 
 | 
                    </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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                        {{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> 
 | 
                        <slot name="right" /> 
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                    </view> 
 | 
                </view> 
 | 
            </view> 
 | 
        </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', 
 | 
        }">{{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); 
 | 
            }, 
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            // 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> 
 |