655 lines
		
	
	
		
			19 KiB
		
	
	
	
		
			Vue
		
	
	
	
			
		
		
	
	
			655 lines
		
	
	
		
			19 KiB
		
	
	
	
		
			Vue
		
	
	
	
<template>
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	<view class="u-upload" v-if="!disabled">
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		<view
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			v-if="showUploadList"
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			class="u-list-item u-preview-wrap"
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			v-for="(item, index) in lists"
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			:key="index"
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			:style="{
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				width: $u.addUnit(width),
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				height: $u.addUnit(height)
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			}"
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		>
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			<view
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				v-if="deletable"
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				class="u-delete-icon"
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				@tap.stop="deleteItem(index)"
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				:style="{
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					background: delBgColor
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				}"
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			>
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				<u-icon class="u-icon" :name="delIcon" size="20" :color="delColor"></u-icon>
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			</view>
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			<u-line-progress
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				v-if="showProgress && item.progress > 0 && !item.error"
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				:show-percent="false"
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				height="16"
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				class="u-progress"
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				:percent="item.progress"
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			></u-line-progress>
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			<view @tap.stop="retry(index)" v-if="item.error" class="u-error-btn">点击重试</view>
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			<image @tap.stop="doPreviewImage(item.url || item.path, index)" class="u-preview-image" v-if="!item.isImage" :src="item.url || item.path" :mode="imageMode"></image>
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		</view>
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		<slot name="file" :file="lists"></slot>
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		<view style="display: inline-block;" @tap="selectFile" v-if="maxCount > lists.length">
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			<slot name="addBtn"></slot>
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			<view
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				v-if="!customBtn"
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				class="u-list-item u-add-wrap"
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				hover-class="u-add-wrap__hover"
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				hover-stay-time="150"
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				:style="{
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					width: $u.addUnit(width),
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					height: $u.addUnit(height)
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				}"
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			>
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				<u-icon name="plus" class="u-add-btn" size="40"></u-icon>
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				<view class="u-add-tips">{{ uploadText }}</view>
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			</view>
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		</view>
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	</view>
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</template>
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<script>
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/**
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 * upload 图片上传
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 * @description 该组件用于上传图片场景
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 * @tutorial https://www.uviewui.com/components/upload.html
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 * @property {String} action 服务器上传地址
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 * @property {String Number} max-count 最大选择图片的数量(默认99)
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 * @property {Boolean} custom-btn 如果需要自定义选择图片的按钮,设置为true(默认false)
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 * @property {Boolean} show-progress 是否显示进度条(默认true)
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 * @property {Boolean} disabled 是否启用(显示/移仓)组件(默认false)
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 * @property {String} image-mode 预览图片等显示模式,可选值为uni的image的mode属性值(默认aspectFill)
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 * @property {String} del-icon 右上角删除图标名称,只能为uView内置图标
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 * @property {String} del-bg-color 右上角关闭按钮的背景颜色
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 * @property {String | Number} index 在各个回调事件中的最后一个参数返回,用于区别是哪一个组件的事件
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 * @property {String} del-color 右上角关闭按钮图标的颜色
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 * @property {Object} header 上传携带的头信息,对象形式
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 * @property {Object} form-data 上传额外携带的参数
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 * @property {String} name 上传文件的字段名,供后端获取使用(默认file)
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 * @property {Array<String>} size-type original 原图,compressed 压缩图,默认二者都有(默认['original', 'compressed'])
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 * @property {Array<String>} source-type 选择图片的来源,album-从相册选图,camera-使用相机,默认二者都有(默认['album', 'camera'])
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 * @property {Boolean} preview-full-image	是否可以通过uni.previewImage预览已选择的图片(默认true)
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 * @property {Boolean} multiple	是否开启图片多选,部分安卓机型不支持(默认true)
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 * @property {Boolean} deletable 是否显示删除图片的按钮(默认true)
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 * @property {String Number} max-size 选择单个文件的最大大小,单位B(byte),默认不限制(默认Number.MAX_VALUE)
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 * @property {Array<Object>} file-list 默认显示的图片列表,数组元素为对象,必须提供url属性
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 * @property {Boolean} upload-text 选择图片按钮的提示文字(默认“选择图片”)
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 * @property {Boolean} auto-upload 选择完图片是否自动上传,见上方说明(默认true)
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 * @property {Boolean} show-tips 特殊情况下是否自动提示toast,见上方说明(默认true)
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 * @property {Boolean} show-upload-list 是否显示组件内部的图片预览(默认true)
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 * @event {Function} on-oversize 图片大小超出最大允许大小
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 * @event {Function} on-preview 全屏预览图片时触发
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 * @event {Function} on-remove 移除图片时触发
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 * @event {Function} on-success 图片上传成功时触发
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 * @event {Function} on-change 图片上传后,无论成功或者失败都会触发
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 * @event {Function} on-error 图片上传失败时触发
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 * @event {Function} on-progress 图片上传过程中的进度变化过程触发
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 * @event {Function} on-uploaded 所有图片上传完毕触发
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 * @event {Function} on-choose-complete 每次选择图片后触发,只是让外部可以得知每次选择后,内部的文件列表
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 * @example <u-upload :action="action" :file-list="fileList" ></u-upload>
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 */
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export default {
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	name: 'u-upload',
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	props: {
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		//是否显示组件自带的图片预览功能
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		showUploadList: {
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			type: Boolean,
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			default: true
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		},
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		// 后端地址
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		action: {
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			type: String,
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			default: ''
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		},
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		// 最大上传数量
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		maxCount: {
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			type: [String, Number],
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			default: 52
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		},
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		//  是否显示进度条
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		showProgress: {
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			type: Boolean,
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			default: true
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		},
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		// 是否启用
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		disabled: {
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			type: Boolean,
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			default: false
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		},
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		// 预览上传的图片时的裁剪模式,和image组件mode属性一致
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		imageMode: {
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			type: String,
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			default: 'aspectFill'
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		},
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		// 头部信息
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		header: {
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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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		// 额外携带的参数
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		formData: {
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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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		// 上传的文件字段名
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		name: {
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			type: String,
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			default: 'file'
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		},
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		// 所选的图片的尺寸, 可选值为original compressed
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		sizeType: {
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			type: Array,
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			default() {
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				return [];
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			}
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		},
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		sourceType: {
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			type: Array,
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			default() {
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				return [];
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			}
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		},
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		// 是否在点击预览图后展示全屏图片预览
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		previewFullImage: {
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			type: Boolean,
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			default: true
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		},
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		// 是否开启图片多选,部分安卓机型不支持
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		multiple: {
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			type: Boolean,
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			default: true
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		},
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		// 是否展示删除按钮
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		deletable: {
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			type: Boolean,
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			default: true
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		},
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		// 文件大小限制,单位为byte
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		maxSize: {
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			type: [String, Number],
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			default: Number.MAX_VALUE
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		},
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		// 显示已上传的文件列表
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		fileList: {
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			type: Array,
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			default() {
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				return [];
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			}
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		},
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		// 上传区域的提示文字
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		uploadText: {
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			type: String,
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			default: '选择图片'
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		},
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		// 是否自动上传
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		autoUpload: {
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			type: Boolean,
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			default: true
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		},
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		// 是否显示toast消息提示
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		showTips: {
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			type: Boolean,
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			default: true
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		},
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		// 是否通过slot自定义传入选择图标的按钮
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		customBtn: {
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			type: Boolean,
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			default: false
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		},
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		// 内部预览图片区域和选择图片按钮的区域宽度
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		width: {
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			type: [String, Number],
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			default: 200
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		},
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		// 内部预览图片区域和选择图片按钮的区域高度
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		height: {
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			type: [String, Number],
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			default: 200
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		},
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		// 右上角关闭按钮的背景颜色
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		delBgColor: {
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			type: String,
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			default: '#fa3534'
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		},
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		// 右上角关闭按钮的叉号图标的颜色
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		delColor: {
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			type: String,
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			default: '#ffffff'
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		},
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		// 右上角删除图标名称,只能为uView内置图标
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		delIcon: {
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			type: String,
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			default: 'close'
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		},
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		// 如果上传后的返回值为json字符串,是否自动转json
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		toJson: {
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			type: Boolean,
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			default: true
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		},
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		// 上传前的钩子,每个文件上传前都会执行
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		beforeUpload: {
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			type: Function,
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			default: null
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		},
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		// 移除文件前的钩子
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		beforeRemove: {
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			type: Function,
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			default: null
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		},
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		// 允许上传的图片后缀
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		limitType:{
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			type: Array,
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			default() {
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				// 支付宝小程序真机选择图片的后缀为"image"
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				// https://opendocs.alipay.com/mini/api/media-image
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				return ['png', 'jpg', 'jpeg', 'webp', 'gif', 'image'];
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			}
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		},
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		// 在各个回调事件中的最后一个参数返回,用于区别是哪一个组件的事件
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		index: {
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			type: [Number, String],
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			default: ''
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		}
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	},
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	mounted() {},
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	data() {
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		return {
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			lists: [],
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			isInCount: true,
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			uploading: false
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		};
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	},
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	watch: {
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		fileList: {
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			immediate: true,
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			handler(val) {
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				val.map(value => {
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					// 首先检查内部是否已经添加过这张图片,因为外部绑定了一个对象给fileList的话(对象引用),进行修改外部fileList
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					// 时,会触发watch,导致重新把原来的图片再次添加到this.lists
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					// 数组的some方法意思是,只要数组元素有任意一个元素条件符合,就返回true,而另一个数组的every方法的意思是数组所有元素都符合条件才返回true
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					let tmp = this.lists.some(val => {
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						return val.url == value.url;
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					})
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					// 如果内部没有这个图片(tmp为false),则添加到内部
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					!tmp && this.lists.push({ url: value.url, error: false, progress: 100 });
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				});
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			}
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		},
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		// 监听lists的变化,发出事件
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		lists(n) {
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			this.$emit('on-list-change', n, this.index);
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		}
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	},
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	methods: {
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		// 清除列表
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		clear() {
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			this.lists = [];
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		},
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		// 重新上传队列中上传失败的所有文件
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		reUpload() {
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			this.uploadFile();
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		},
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		// 选择图片
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		selectFile() {
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			if (this.disabled) return;
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			const { name = '', maxCount, multiple, maxSize, sizeType, lists, camera, compressed, maxDuration, sourceType } = this;
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			let chooseFile = null;
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			const newMaxCount = maxCount - lists.length;
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			// 设置为只选择图片的时候使用 chooseImage 来实现
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			chooseFile = new Promise((resolve, reject) => {
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				uni.chooseFile({
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					count: multiple ? (newMaxCount > 9 ? 9 : newMaxCount) : 1,
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					sourceType: sourceType,
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					sizeType,
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					success: resolve,
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					fail: reject
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				});
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			});
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			chooseFile
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				.then(res => {
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					let file = null;
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					let listOldLength = this.lists.length;
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					res.tempFiles.map((val, index) => {
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						// 检查文件后缀是否允许,如果不在this.limitType内,就会返回false
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						if(!this.checkFileExt(val)) return ;
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						// 如果是非多选,index大于等于1或者超出最大限制数量时,不处理
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						if (!multiple && index >= 1) return;
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						if (val.size > maxSize) {
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							this.$emit('on-oversize', val, this.lists, this.index);
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							this.showToast('超出允许的文件大小');
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						} else {
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							if (maxCount <= lists.length) {
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								this.$emit('on-exceed', val, this.lists, this.index);
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								this.showToast('超出最大允许的文件个数');
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								return;
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							}
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							lists.push({
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								url: val.path,
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								progress: 0,
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								error: false,
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								file: val
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							});
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						}
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					});
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					// 每次图片选择完,抛出一个事件,并将当前内部选择的图片数组抛出去
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					this.$emit('on-choose-complete', this.lists, this.index);
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					if (this.autoUpload) this.uploadFile(listOldLength);
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				})
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				.catch(error => {
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					this.$emit('on-choose-fail', error);
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				});
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		},
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		// 提示用户消息
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		showToast(message, force = false) {
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			if (this.showTips || force) {
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				uni.showToast({
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					title: message,
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					icon: 'none'
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				});
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			}
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		},
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		// 该方法供用户通过ref调用,手动上传
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		upload() {
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			this.uploadFile();
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		},
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		// 对失败的图片重新上传
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		retry(index) {
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			this.lists[index].progress = 0;
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			this.lists[index].error = false;
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			this.lists[index].response = null;
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			uni.showLoading({
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				title: '重新上传'
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			});
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			this.uploadFile(index);
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		},
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		// 上传图片
 | 
						||
		async uploadFile(index = 0) {
 | 
						||
			if (this.disabled) return;
 | 
						||
			if (this.uploading) return;
 | 
						||
			// 全部上传完成
 | 
						||
			if (index >= this.lists.length) {
 | 
						||
				this.$emit('on-uploaded', this.lists, this.index);
 | 
						||
				return;
 | 
						||
			}
 | 
						||
			// 检查是否是已上传或者正在上传中
 | 
						||
			if (this.lists[index].progress == 100) {
 | 
						||
				if (this.autoUpload == false) this.uploadFile(index + 1);
 | 
						||
				return;
 | 
						||
			}
 | 
						||
			// 执行before-upload钩子
 | 
						||
			if(this.beforeUpload && typeof(this.beforeUpload) === 'function') {
 | 
						||
				// 执行回调,同时传入索引和文件列表当作参数
 | 
						||
				// 在微信,支付宝等环境(H5正常),会导致父组件定义的customBack()函数体中的this变成子组件的this
 | 
						||
				// 通过bind()方法,绑定父组件的this,让this.customBack()的this为父组件的上下文
 | 
						||
				// 因为upload组件可能会被嵌套在其他组件内,比如u-form,这时this.$parent其实为u-form的this,
 | 
						||
				// 非页面的this,所以这里需要往上历遍,一直寻找到最顶端的$parent,这里用了this.$u.$parent.call(this)
 | 
						||
				// 明白意思即可,无需纠结this.$u.$parent.call(this)的细节
 | 
						||
				let beforeResponse = this.beforeUpload.bind(this.$u.$parent.call(this))(index, this.lists);
 | 
						||
				// 判断是否返回了promise
 | 
						||
				if (!!beforeResponse && typeof beforeResponse.then === 'function') {
 | 
						||
					await beforeResponse.then(res => {
 | 
						||
						// promise返回成功,不进行动作,继续上传
 | 
						||
					}).catch(err => {
 | 
						||
						// 进入catch回调的话,继续下一张
 | 
						||
						return this.uploadFile(index + 1);
 | 
						||
					})
 | 
						||
				} else if(beforeResponse === false) {
 | 
						||
					// 如果返回false,继续下一张图片的上传
 | 
						||
					return this.uploadFile(index + 1);
 | 
						||
				} else {
 | 
						||
					// 此处为返回"true"的情形,这里不写代码,就跳过此处,继续执行当前的上传逻辑
 | 
						||
				}
 | 
						||
			}
 | 
						||
			// 检查上传地址
 | 
						||
			if (!this.action) {
 | 
						||
				this.showToast('请配置上传地址', true);
 | 
						||
				return;
 | 
						||
			}
 | 
						||
			this.lists[index].error = false;
 | 
						||
			this.uploading = true;
 | 
						||
			// 创建上传对象
 | 
						||
			const task = uni.uploadFile({
 | 
						||
				url: this.action,
 | 
						||
				filePath: this.lists[index].url,
 | 
						||
				name: this.name,
 | 
						||
				formData: this.formData,
 | 
						||
				header: this.header,
 | 
						||
				success: res => {
 | 
						||
					// 判断是否json字符串,将其转为json格式
 | 
						||
					let data = this.toJson && this.$u.test.jsonString(res.data) ? JSON.parse(res.data) : res.data;
 | 
						||
					if (![200, 201, 204].includes(res.statusCode)) {
 | 
						||
						this.uploadError(index, data);
 | 
						||
					} else {
 | 
						||
						// 上传成功
 | 
						||
						this.lists[index].response = data;
 | 
						||
						this.lists[index].progress = 100;
 | 
						||
						this.lists[index].error = false;
 | 
						||
						this.$emit('on-success', data, index, this.lists, this.index);
 | 
						||
					}
 | 
						||
				},
 | 
						||
				fail: e => {
 | 
						||
					this.uploadError(index, e);
 | 
						||
				},
 | 
						||
				complete: res => {
 | 
						||
					uni.hideLoading();
 | 
						||
					this.uploading = false;
 | 
						||
					this.uploadFile(index + 1);
 | 
						||
					this.$emit('on-change', res, index, this.lists, this.index);
 | 
						||
				}
 | 
						||
			});
 | 
						||
			task.onProgressUpdate(res => {
 | 
						||
				if (res.progress > 0) {
 | 
						||
					this.lists[index].progress = res.progress;
 | 
						||
					this.$emit('on-progress', res, index, this.lists, this.index);
 | 
						||
				}
 | 
						||
			});
 | 
						||
		},
 | 
						||
		// 上传失败
 | 
						||
		uploadError(index, err) {
 | 
						||
			this.lists[index].progress = 0;
 | 
						||
			this.lists[index].error = true;
 | 
						||
			this.lists[index].response = null;
 | 
						||
			this.$emit('on-error', err, index, this.lists, this.index);
 | 
						||
			this.showToast('上传失败,请重试');
 | 
						||
		},
 | 
						||
		// 删除一个图片
 | 
						||
		deleteItem(index) {
 | 
						||
			uni.showModal({
 | 
						||
				// title: '提示',
 | 
						||
				content: '您确定要删除此项吗?',
 | 
						||
				success: async (res) => {
 | 
						||
					if (res.confirm) {
 | 
						||
						// 先检查是否有定义before-remove移除前钩子
 | 
						||
						// 执行before-remove钩子
 | 
						||
						if(this.beforeRemove && typeof(this.beforeRemove) === 'function') {
 | 
						||
							// 此处钩子执行 原理同before-remove参数,见上方注释
 | 
						||
							let beforeResponse = this.beforeRemove.bind(this.$u.$parent.call(this))(index, this.lists);
 | 
						||
							// 判断是否返回了promise
 | 
						||
							if (!!beforeResponse && typeof beforeResponse.then === 'function') {
 | 
						||
								await beforeResponse.then(res => {
 | 
						||
									// promise返回成功,不进行动作,继续上传
 | 
						||
									this.handlerDeleteItem(index);
 | 
						||
								}).catch(err => {
 | 
						||
									// 如果进入promise的reject,终止删除操作
 | 
						||
									this.showToast('已终止移除');
 | 
						||
								})
 | 
						||
							} else if(beforeResponse === false) {
 | 
						||
								// 返回false,终止删除
 | 
						||
								this.showToast('已终止移除');
 | 
						||
							} else {
 | 
						||
								// 如果返回true,执行删除操作
 | 
						||
								this.handlerDeleteItem(index);
 | 
						||
							}
 | 
						||
						} else {
 | 
						||
							// 如果不存在before-remove钩子,
 | 
						||
							this.handlerDeleteItem(index);
 | 
						||
						}
 | 
						||
					}
 | 
						||
				}
 | 
						||
			});
 | 
						||
		},
 | 
						||
		// 执行移除图片的动作,上方代码只是判断是否可以移除
 | 
						||
		handlerDeleteItem(index) {
 | 
						||
			// 如果文件正在上传中,终止上传任务,进度在0 < progress < 100则意味着正在上传
 | 
						||
			if (this.lists[index].process < 100 && this.lists[index].process > 0) {
 | 
						||
				typeof this.lists[index].uploadTask != 'undefined' && this.lists[index].uploadTask.abort();
 | 
						||
			}
 | 
						||
			this.lists.splice(index, 1);
 | 
						||
			this.$forceUpdate();
 | 
						||
			this.$emit('on-remove', index, this.lists, this.index);
 | 
						||
			this.showToast('移除成功');
 | 
						||
		},
 | 
						||
		// 用户通过ref手动的形式,移除一张图片
 | 
						||
		remove(index) {
 | 
						||
			// 判断索引的合法范围
 | 
						||
			if (index >= 0 && index < this.lists.length) {
 | 
						||
				this.lists.splice(index, 1);
 | 
						||
				this.$emit('on-list-change', this.lists, this.index);
 | 
						||
			}
 | 
						||
		},
 | 
						||
		// 预览图片
 | 
						||
		doPreviewImage(url, index) {
 | 
						||
			if (!this.previewFullImage) return;
 | 
						||
			const images = this.lists.map(item => item.url || item.path);
 | 
						||
			uni.previewImage({
 | 
						||
				urls: images,
 | 
						||
				current: url,
 | 
						||
				success: () => {
 | 
						||
					this.$emit('on-preview', url, this.lists, this.index);
 | 
						||
				},
 | 
						||
				fail: () => {
 | 
						||
					uni.showToast({
 | 
						||
						title: '预览图片失败',
 | 
						||
						icon: 'none'
 | 
						||
					});
 | 
						||
				}
 | 
						||
			});
 | 
						||
		},
 | 
						||
		// 判断文件后缀是否允许
 | 
						||
		checkFileExt(file) {
 | 
						||
			// 检查是否在允许的后缀中
 | 
						||
			let noArrowExt = false;
 | 
						||
			// 获取后缀名
 | 
						||
			let fileExt = '';
 | 
						||
			const reg = /.+\./;
 | 
						||
			// 如果是H5,需要从name中判断
 | 
						||
			// #ifdef H5
 | 
						||
			fileExt = file.name.replace(reg, "").toLowerCase();
 | 
						||
			// #endif
 | 
						||
			// 非H5,需要从path中读取后缀
 | 
						||
			// #ifndef H5
 | 
						||
			fileExt = file.path.replace(reg, "").toLowerCase();
 | 
						||
			// #endif
 | 
						||
			// 使用数组的some方法,只要符合limitType中的一个,就返回true
 | 
						||
			noArrowExt = this.limitType.some(ext => {
 | 
						||
				// 转为小写
 | 
						||
				return ext.toLowerCase() === fileExt;
 | 
						||
			})
 | 
						||
			if(!noArrowExt) this.showToast(`不允许选择${fileExt}格式的文件`);
 | 
						||
			return noArrowExt;
 | 
						||
		}
 | 
						||
	}
 | 
						||
};
 | 
						||
</script>
 | 
						||
 | 
						||
<style lang="scss" scoped>
 | 
						||
@import '../../libs/css/style.components.scss';
 | 
						||
 | 
						||
.u-upload {
 | 
						||
	@include vue-flex;
 | 
						||
	flex-wrap: wrap;
 | 
						||
	align-items: center;
 | 
						||
}
 | 
						||
 | 
						||
.u-list-item {
 | 
						||
	width: 200rpx;
 | 
						||
	height: 200rpx;
 | 
						||
	overflow: hidden;
 | 
						||
	margin: 10rpx;
 | 
						||
	background: rgb(244, 245, 246);
 | 
						||
	position: relative;
 | 
						||
	border-radius: 10rpx;
 | 
						||
	/* #ifndef APP-NVUE */
 | 
						||
	display: flex;
 | 
						||
	/* #endif */
 | 
						||
	align-items: center;
 | 
						||
	justify-content: center;
 | 
						||
}
 | 
						||
 | 
						||
.u-preview-wrap {
 | 
						||
	border: 1px solid rgb(235, 236, 238);
 | 
						||
}
 | 
						||
 | 
						||
.u-add-wrap {
 | 
						||
	flex-direction: column;
 | 
						||
	color: $u-content-color;
 | 
						||
	font-size: 26rpx;
 | 
						||
}
 | 
						||
 | 
						||
.u-add-tips {
 | 
						||
	margin-top: 20rpx;
 | 
						||
	line-height: 40rpx;
 | 
						||
}
 | 
						||
 | 
						||
.u-add-wrap__hover {
 | 
						||
	background-color: rgb(235, 236, 238);
 | 
						||
}
 | 
						||
 | 
						||
.u-preview-image {
 | 
						||
	display: block;
 | 
						||
	width: 100%;
 | 
						||
	height: 100%;
 | 
						||
	border-radius: 10rpx;
 | 
						||
}
 | 
						||
 | 
						||
.u-delete-icon {
 | 
						||
	position: absolute;
 | 
						||
	top: 10rpx;
 | 
						||
	right: 10rpx;
 | 
						||
	z-index: 10;
 | 
						||
	background-color: $u-type-error;
 | 
						||
	border-radius: 100rpx;
 | 
						||
	width: 44rpx;
 | 
						||
	height: 44rpx;
 | 
						||
	@include vue-flex;
 | 
						||
	align-items: center;
 | 
						||
	justify-content: center;
 | 
						||
}
 | 
						||
 | 
						||
.u-icon {
 | 
						||
	@include vue-flex;
 | 
						||
	align-items: center;
 | 
						||
	justify-content: center;
 | 
						||
}
 | 
						||
 | 
						||
.u-progress {
 | 
						||
	position: absolute;
 | 
						||
	bottom: 10rpx;
 | 
						||
	left: 8rpx;
 | 
						||
	right: 8rpx;
 | 
						||
	z-index: 9;
 | 
						||
	width: auto;
 | 
						||
}
 | 
						||
 | 
						||
.u-error-btn {
 | 
						||
	color: #ffffff;
 | 
						||
	background-color: $u-type-error;
 | 
						||
	font-size: 20rpx;
 | 
						||
	padding: 4px 0;
 | 
						||
	text-align: center;
 | 
						||
	position: absolute;
 | 
						||
	bottom: 0;
 | 
						||
	left: 0;
 | 
						||
	right: 0;
 | 
						||
	z-index: 9;
 | 
						||
	line-height: 1;
 | 
						||
}
 | 
						||
</style>
 |