uniapp develops H5 and uses formData to upload files

Due to the limitation of uni.uploadFile upload in uniapp, it is impossible to upload excel, world, ppt and other types of files, and the upload method in the figure below is not supported, so it can only be solved by calling the native method.

---

solution

1. First create a native upload component

<template>
	<view class="lsj-file" :style="[getStyles]">
		<view ref="lsj" class="hFile" :style="[getStyles]" @click="onClick">
			<slot><view class="defview" :style="[getStyles]">上传</view></slot>
		</view>
	</view>
</template>

<script>
import {LsjFile} from './LsjFile.js' 
export default {
	name: 'Lsj-upload',
	props: {
		// 打印日志
		debug: {type: Boolean,default: false},
		// 自动上传
		instantly: {type: Boolean,default: false},
		// 上传接口参数设置
		option: {type: Object,default: ()=>{}},
		// 文件大小上限
		size: { type: Number, default: 10 },
		// 文件选择个数上限,超出后不触发点击
		count: { type: Number, default: 9 },
		// 允许上传的文件格式（多个以逗号隔开）
		formats: { type: String, default:''},
		// input file选择限制
		accept: {type: String,default: ''},
		// 微信选择文件类型 
		//all=从所有文件选择，
		//video=只能选择视频文件，
		//image=只能选择图片文件，
		//file=可以选择除了图片和视频之外的其它的文件
		wxFileType: { type: String, default: 'all' },
		// webviewID需唯一，不同窗口也不要同Id
		childId: { type: String, default: 'lsjUpload'  },
		// 文件选择触发面宽度
		width: { type: String, default: '100%' },
		// 文件选择触发面高度
		height: { type: String, default: '80rpx' },
		
		// top,left,bottom,right仅position=absolute时才需要传入
		top: { type: [String, Number], default: '' },
		left: { type: [String, Number], default: '' },
		bottom: { type: [String, Number], default: '' },
		right: { type: [String, Number], default: '' },
		// nvue不支持跟随窗口滚动
		position: { 
			type: String,
			// #ifdef APP-NVUE
			 default: 'absolute',
			// #endif
			// #ifndef APP-NVUE
			default: 'static',
			// #endif
		},
	},
	data() {
		return {
			
		}
	},
	watch: {
		option(v) {
			// #ifdef APP-PLUS
			this.lsjFile&&this.show();
			// #endif
		}
	},
	updated() {
		// #ifdef APP-PLUS
			if (this.isShow) {
				this.lsjFile&&this.show();
			}
		// #endif
	},
	computed: {
		getStyles() {
			let styles = {
				width: this.width,
				height: this.height
			}
			if (this.position == 'absolute') {
				styles['top'] = this.top
				styles['bottom'] = this.bottom
				styles['left'] = this.left
				styles['right'] = this.right
				styles['position'] = 'fixed'
			}

			return styles
		}
	},
	mounted() {
		this._size = 0;
		let WEBID = this.childId + new Date().getTime();
		this.lsjFile = new LsjFile({
			id: WEBID,
			debug: this.debug,
			width: this.width,
			height: this.height,
			option: this.option,
			instantly: this.instantly,
			// 限制条件
			prohibited: {
				// 大小
				size: this.size,
				// 允许上传的格式
				formats: this.formats,
				// 限制选择的格式
				accept: this.accept,
				count: this.count
			},
			onchange: this.onchange,
			onprogress: this.onprogress,
		});
		this.create();
		
	},
	beforeDestroy() {
		// #ifdef APP-PLUS
		this.lsjFile.dom.close();
		// #endif
	},
	methods: {
		setFiles(array) {
			if (array instanceof Map) {
				for (let [key, item] of array) {
					item['progress'] = 100;
					item['type'] = 'success';
					this.lsjFile.files.set(key,item);
				}
			}
			else if (Array.isArray(array)) {
				array.forEach(item=>{
					if (item.name) { 
						item['progress'] = 100;
						item['type'] = 'success';
						this.lsjFile.files.set(item.name,item);
					}
				});
			}
			this.onchange(this.lsjFile.files);
		},
		setData() {
			this.lsjFile&&this.lsjFile.setData(...arguments);
		},
		getDomStyles(callback) {
			// #ifndef APP-NVUE
			let view = uni
				.createSelectorQuery()
				.in(this)
				.select('.lsj-file')
			view.fields(
				{
					size: true,
					rect: true
				},
				({ height, width, top, left, right, bottom }) => {
					uni.createSelectorQuery()
					.selectViewport()
					.scrollOffset(({ scrollTop }) => {
						return callback({
							top: parseInt(top) + parseInt(scrollTop) + 'px',
							left: parseInt(left) + 'px',
							width: parseInt(width) + 'px',
							height: parseInt(height) + 'px'
						})
					})
					.exec()
				}
			).exec()
			// #endif
			// #ifdef APP-NVUE
			const dom = weex.requireModule('dom')
			dom.getComponentRect(this.$refs.lsj, ({ size: { height, width, top, left, right, bottom } }) => {
				return callback({
					top: parseInt(top) + 'px',
					left: parseInt(left) + 'px',
					width: parseInt(width) + 'px',
					height: parseInt(height) + 'px',
					right: parseInt(right) + 'px',
					bottom: parseInt(bottom) + 'px'
				})
			})
			// #endif
		},
		show() {
			this.isShow = true;
			// #ifdef APP-PLUS
			this.lsjFile&&this.getDomStyles(styles => {
				this.lsjFile.dom.setStyle(styles)
			});
			// #endif
			// #ifdef H5
			this.lsjFile.dom.style.display = 'inline'
			// #endif
		},
		hide() {
			this.isShow = false;
			// #ifdef APP-PLUS
			this.lsjFile&&this.lsjFile.dom.setStyle({
				top: '-100px',
				left:'0px',
				width: '1px',
				height: '100px',
			});
			// #endif
			// #ifdef H5
			this.lsjFile.dom.style.display = 'none'
			// #endif
		},
		/**
		 * 手动提交上传
		 * @param {string}name 文件名称，不传则上传所有type等于waiting和fail的文件
		 */
		upload(name) {
			this.lsjFile&&this.lsjFile.upload(name);
		},
		/**
		 * @returns {Map} 已选择的文件Map集
		 */
		onchange(files) {
			this.$emit('change',files);
			this._size = files.size;
			return files.size >= this.count ? this.hide() : this.show();
		},
		/**
		 * @returns {object} 当前上传中的对象
		 */
		onprogress(item,end=false) {
			this.$emit('progress',item);
			if (end) {
				setTimeout(()=>{
					this.$emit('uploadEnd',item);
				},0);
			}
		},
		/**
		 * 移除组件内缓存的某条数据
		 * @param {string}name 文件名称,不指定默认清除所有文件
		 */
		clear(name) {
			this.lsjFile.clear(name);
		},
		// 创建选择器
		create() {
			// 若iOS端服务端处理不了跨域就将hybrid目录内的html放到服务端去，并将此处path改成服务器上的地址
			let path = '/uni_modules/lsj-upload/hybrid/html/uploadFile.html';
			let dom = this.lsjFile.create(path);
			// #ifdef H5
			this.$refs.lsj.$el.appendChild(dom);
			// #endif
			// #ifndef APP-PLUS
			this.show();
			// #endif
			// #ifdef APP-PLUS
			dom.setStyle({position: this.position});
			dom.loadURL(path);
			setTimeout(()=>{
				// #ifdef APP-NVUE
				plus.webview.currentWebview().append(dom);
				// #endif
				// #ifndef APP-NVUE
				this.$root.$scope.$getAppWebview().append(dom);
				// #endif
				this.show();
			},300)
			// #endif
		},
		// 点击选择附件
		onClick() {
			if (this._size >= this.count) {
				this.toast(`只允许上传${this.count}个文件`);
				return;
			}
			
			// #ifdef MP-WEIXIN
			if (!this.isShow) {return;}
			let count = this.count - this._size;
			this.lsjFile.chooseMessageFile(this.wxFileType,count);
			// #endif
		},
		toast(msg) {
			uni.showToast({
				title: msg,
				icon: 'none'
			});
		}
	}
}
</script>

<style scoped>
.lsj-file {
	/* display: inline-block; */
}
.defview {
	/* background-color: #007aff;
	color: #fff;
	border-radius: 10rpx;
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 28rpx; */
}
.hFile {
	/* position: relative;
	overflow: hidden; */
}
</style>

 LsjFile.js

export class LsjFile {
	constructor(data) {
		this.dom = null;
		// files.type = waiting;//（等待上传）|| loading（上传中）|| success（成功） || fail（失败）
		this.files = new Map();
		this.debug = data.debug || false;
		this.id = data.id;
		this.width = data.width;
		this.height = data.height;
		this.option = data.option;
		this.instantly = data.instantly;
		this.prohibited = data.prohibited;
		this.onchange = data.onchange;
		this.onprogress = data.onprogress;
		this.uploadHandle = this._uploadHandle;
		// #ifdef MP-WEIXIN
		this.uploadHandle = this._uploadHandleWX;
		// #endif
	}
	
	
	/**
	 * 创建File节点
	 * @param {string}path webview地址
	 */
	create(path) {
		if (!this.dom) {
			// #ifdef H5
				let dom = document.createElement('input');
				dom.type = 'file'
				dom.value = ''
				dom.style.height = this.height
				dom.style.width = this.width
			    // dom.style.visibility = 'hidden'
				dom.style.position = 'absolute'
				dom.style.top = 0
				dom.style.left = 0
				dom.style.right = 0
				dom.style.bottom = 0
				dom.style.opacity = 0
				dom.style.zIndex = 0
				dom.accept = this.prohibited.accept;
				if (this.prohibited.count > 1) {
				dom.multiple = 'multiple';
				}
				dom.onchange = event => {
					for (let file of event.target.files) {
						this.addFile(file);
					}
					this.dom.value = '';
				};
				this.dom = dom;
			// #endif
		
			// #ifdef APP-PLUS
				let styles = {
					top: '-100px',
					left: 0,
					width: '1px',
					height: '1px',
					background: 'transparent' 
				};
				let extras = {
					debug: this.debug,
					instantly: this.instantly,
					prohibited: this.prohibited,
				}
				this.dom = plus.webview.create(path, this.id, styles,extras);
				this.setData(this.option); 
				this._overrideUrlLoading();
			// #endif
			return this.dom;
		}
	}
	
	copyObject(obj) {
		if (typeof obj !== "undefined") {
			return JSON.parse(JSON.stringify(obj));
		} else {
			return obj;
		}
	}
	
	/**
	 * 自动根据字符串路径设置对象中的值 支持.和[]
	 * @param	{Object} dataObj 数据源
	 * @param	{String} name 支持a.b 和 a[b]
	 * @param	{String} value 值
	 * setValue(dataObj, name, value);
	 */
	setValue(dataObj, name, value) {
		// 通过正则表达式  查找路径数据
		let dataValue;
		if (typeof value === "object") {
			dataValue = this.copyObject(value);
		} else {
			dataValue = value;
		}
		let regExp = new RegExp("([\\w$]+)|\\[(:\\d)\\]", "g");
		const patten = name.match(regExp);
		// 遍历路径  逐级查找  最后一级用于直接赋值
		for (let i = 0; i < patten.length - 1; i++) {
			let keyName = patten[i];
			if (typeof dataObj[keyName] !== "object") dataObj[keyName] = {};
			dataObj = dataObj[keyName];
		}
		// 最后一级
		dataObj[patten[patten.length - 1]] = dataValue;
		this.debug&&console.log('参数更新后',JSON.stringify(this.option));
	}
	
	/**
	 * 设置上传参数
	 * @param {object|string}name 上传参数,支持a.b 和 a[b]
	 */
	setData() {
		let [name,value = ''] = arguments;
		if (typeof name === 'object') {
			Object.assign(this.option,name);
		}
		else {
			this.setValue(this.option,name,value);
		}
		
		this.debug&&console.log(JSON.stringify(this.option));
		
		// #ifdef APP-PLUS
			this.dom.evalJS(`vm.setData('${JSON.stringify(this.option)}')`);
		// #endif
	}
	
	/**
	 * 上传
	 * @param {string}name 文件名称
	 */
	async upload(name='') {
		if (!this.option.url) {
			throw Error('未设置上传地址');
		}
		
		// #ifndef APP-PLUS
		console.log('has',this.files.has(name))
			if (name && this.files.has(name)) {
				await this.uploadHandle(this.files.get(name));
			}
			else {
				for (let item of this.files.values()) {
					if (item.type === 'waiting' || item.type === 'fail') {
						await this.uploadHandle(item);
					}
				}
			}
		// #endif
		
		// #ifdef APP-PLUS
			this.dom&&this.dom.evalJS(`vm.upload('${name}')`);
		// #endif
	}
	
	// 选择文件change
	addFile(file) {
		
		let name = file.name;
		this.debug&&console.log('文件名称',name,'大小',file.size);
		
		if (file) {
			// 限制文件格式
			let path = '';
			let suffix = name.substring(name.lastIndexOf(".")+1).toLowerCase();
			let formats = this.prohibited.formats.toLowerCase();
			if (formats&&!formats.includes(suffix)) {
				this.toast(`不支持上传${suffix.toUpperCase()}格式文件`);
				return false;
			}
			// 限制文件大小
			if (file.size > 1024 * 1024 * Math.abs(this.prohibited.size)) {
				this.toast(`附件大小请勿超过${this.prohibited.size}M`)
				return false;
			}
			// #ifndef MP-WEIXIN
			path = URL.createObjectURL(file);
			// #endif
			// #ifdef MP-WEIXIN
			path = file.path;
			// #endif
			this.files.set(file.name,{file,path,name: file.name,size: file.size,progress: 0,type: 'waiting'});
			
			// #ifndef MP-WEIXIN
			this.onchange(this.files);
			this.instantly&&this.upload();
			// #endif
			
			// #ifdef MP-WEIXIN
			return true;
			// #endif
		}
	}
	
	/**
	 * 移除文件
	 * @param {string}name 不传name默认移除所有文件，传入name移除指定name的文件
	 */
	clear(name='') {
		// #ifdef APP-PLUS
		this.dom&&this.dom.evalJS(`vm.clear('${name}')`);
		// #endif
		
		if (!name) {
			this.files.clear();
		}
		else {
			this.files.delete(name); 
		}
		return this.onchange(this.files);
	}
	
	/**
	 * 提示框
	 * @param {string}msg 轻提示内容
	 */
	toast(msg) {
		uni.showToast({
			title: msg,
			icon: 'none'
		});
	}
	
	/**
	 * 微信小程序选择文件
	 * @param {number}count 可选择文件数量
	 */
	chooseMessageFile(type,count) {
		wx.chooseMessageFile({
			count: count,
			type: type,
			success: ({ tempFiles }) => {
				for (let file of tempFiles) {
					let next = this.addFile(file);
					if (!next) {return}
				}
				this.onchange(this.files);
				this.instantly&&this.upload();
			},
			fail: () => {
				this.toast(`打开失败`);
			}
		})
	}
	
	_overrideUrlLoading() {
		this.dom.overrideUrlLoading({ mode: 'reject' }, e => {
			let {retype,item,files,end} = this._getRequest(
				e.url
			);
			let _this = this;
			switch (retype) {
				case 'updateOption':
					this.dom.evalJS(`vm.setData('${JSON.stringify(_this.option)}')`);
					break
				case 'change':
					try {
						_this.files = new Map([..._this.files,...JSON.parse(unescape(files))]);
					} catch (e) {
						return console.error('出错了，请检查代码')
					}
					_this.onchange(_this.files);
					break
				case 'progress':
					try {
						item = JSON.parse(unescape(item));
					} catch (e) {
						return console.error('出错了，请检查代码')
					}
					_this._changeFilesItem(item,end);
					break
				default:
					break
			}
		})
	}
	
	_getRequest(url) {
		let theRequest = new Object()
		let index = url.indexOf('?')
		if (index != -1) {
			let str = url.substring(index + 1)
			let strs = str.split('&')
			for (let i = 0; i < strs.length; i++) {
				theRequest[strs[i].split('=')[0]] = unescape(strs[i].split('=')[1])
			}
		}
		return theRequest
	}
	
	_changeFilesItem(item,end=false) {
		this.debug&&console.log('onprogress',JSON.stringify(item));
		this.onprogress(item,end);
		this.files.set(item.name,item);
	}
	// 上传接口
	_uploadHandle(item) {
		item.type = 'loading';
		delete item.responseText;
		return new Promise((resolve,reject)=>{
			this.debug&&console.log('option',JSON.stringify(this.option));
			let {url,name,method='POST',header,formData} = this.option;
			let form = new FormData();
			for (let keys in formData) {
				form.append(keys, formData[keys])
			}
			form.append(name, item.file);
			let xmlRequest = new XMLHttpRequest();
			xmlRequest.open(method, url, true);
			for (let keys in header) {
				xmlRequest.setRequestHeader(keys, header[keys])
			}
			
			xmlRequest.upload.addEventListener(
				'progress',
				event => {
					if (event.lengthComputable) {
						let progress = Math.ceil((event.loaded * 100) / event.total)
						if (progress <= 100) {
							item.progress = progress;
							this._changeFilesItem(item);
						}
					}
				},
				false
			);
			
			xmlRequest.ontimeout = () => {
				console.error('请求超时')
				item.type = 'fail';
				this._changeFilesItem(item,true);
				return resolve(false);
			}
			
			xmlRequest.onreadystatechange = ev => {
				if (xmlRequest.readyState == 4) {
					if (xmlRequest.status == 200) {
						this.debug&&console.log('上传完成1：' + xmlRequest.responseText)
						item['responseText'] = xmlRequest.responseText;
						item.type = 'success';
						this._changeFilesItem(item,true);
						return resolve(true);
					} else if (xmlRequest.status == 0) {
						console.error('status = 0 :请检查请求头Content-Type与服务端是否匹配，服务端已正确开启跨域，并且nginx未拦截阻止请求')
					}
					console.error('--ERROR--：status = ' + xmlRequest.status)
					item.type = 'fail';
					this._changeFilesItem(item,true);
					return resolve(false);
				}
			}
			xmlRequest.send(form)
		});
	}
	
	_uploadHandleWX(item) {
		item.type = 'loading';
		delete item.responseText;
		return new Promise((resolve,reject)=>{
			this.debug&&console.log('option',JSON.stringify(this.option));
			let form = {filePath: item.file.path,...this.option };
			form['fail'] = ({ errMsg = '' }) => {
				console.error('--ERROR--：' + errMsg)
				item.type = 'fail';
				this._changeFilesItem(item,true);
				return resolve(false);
			}
			form['success'] = res => {
				if (res.statusCode == 200) {
					this.debug&&console.log('上传完成,微信端返回不一定是字符串，根据接口返回格式判断是否需要JSON.parse：' + res.data)
					item['responseText'] = res.data;
					item.type = 'success';
					this._changeFilesItem(item,true);
					return resolve(true);
				}
				item.type = 'fail';
				this._changeFilesItem(item,true);
				return resolve(false);
			}
			
			let xmlRequest = uni.uploadFile(form);
			xmlRequest.onProgressUpdate(({ progress = 0 }) => {
				if (progress <= 100) {
					item.progress = progress;
					this._changeFilesItem(item);
				}
			})
		});
	}
}

---

 2. Use components

After importing the component use

<uploadFile @getUploadSuccess="getUploadSuccess" :uploadUrl="uploadbeforeCreatedUrl" :formData="{}" formatType="png,jpg,jpeg,pdf,docx,doc,xlsx,xls,ppt,pptx">
     <image :src="addIcon" mode="scaleToFill" />
</uploadFile>

// uploadUrl为上传的路径

// 文件上传成功回调
 getUploadSuccess(fileData){
        let resdata = JSON.parse(fileData.responseText);
        this.form.activityResource.push(resdata.data);
        this.$forceUpdate();
 },

---

renderings