本文主要介绍new XMLHttpRequest()监听附件上传进度，解决优化loading长时间加载，用户等待问题
一、存在问题
经测试发现，new XMLHttpRequest()在附件上传请求中，WIFI关闭切4G上传，上传进度不会持续；4G不关闭打开WIFI会继续上传，但等待时间过长，实际上是4G在上传，倘若关闭4G网络，上传进度终止。
二、相关代码
2.1 HTML
1 2 3 4 5 6 7 8 9 10 | <div class="process-wrapper" id="processWrap"> <div class="process-face"></div> <img decoding="async" class="close-icon" id="closeBtn" src="../../images/close.png" alt=""><div class="process"> <div class="process-inner" id="processInner" style="width:50%"></div> <div class="process-value"> <span>提交中...</span> <span id="process">0%</span> </div> </div></div> |
2.2 CSS样式
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | /* 附件上传进度条 */.process-wrapper{ -moz-user-select:none; position: fixed; left: 0; top: 0; bottom: 0; right: 0; z-index: 10000; display: none;}.process-face{ width: 100%; height: 100%; background-color: #000; opacity: 0.7; position: fixed;}.close-icon{ width: 26px; height: 26px; position: fixed; left: 50%; top: calc( 50% + 40px ); transform: translate(-50%,-50%);}.process{ width: 90%; height: 30px; background-color: #fff; border-radius: 30px; overflow: hidden; position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%); text-align: center; font-size: 14px; line-height: 30px; color: #999;}.process-inner{ width: 100%; height: 30px; position: absolute; left: 0; top: 0; background-color: #0079C1; transition: 0.1s; z-index: -1;} |
2.3 JS
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | (function(app, doc) { var $processWrap = document.getElementById("processWrap"), $closeBtn = document.getElementById("closeBtn"), xhr = new XMLHttpRequest(); doc.addEventListener('netchange', onNetChange, false); function onNetChange() { if ($processWrap.style.display != "none") { $processWrap.style.display = "none"; xhr.abort(); mui.toast('网络中断请重试'); } } doSend: function() { app.ajaxFile({ //封装好的ajax请求 url: "", data: FormData, xhr: xhr, success: function(r) { if (r == '1') { mui.toast("保存成功"); // 上传成功逻辑处理 } else { $processWrap.style.display = "none"; mui.toast(app.netError); } }, error: function(r) { $processWrap.style.display = "none"; }, progress: function(e) { if (e.lengthComputable) { var progressBar = parseInt((e.loaded / e.total) * 100); if (progressBar |
三、app.js封装ajax请求
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | var $ajaxCount = 0;window.app = { //ajaxFile超时时间 fileTimeout: 180000, ajaxFile: function(option) { $ajaxCount++; var _ajaxCount = $ajaxCount; if (!option.error) { option.error = ajaxError; // 请求失败提示 } if (option.validateUserInfo == undefined) option.validateUserInfo = true; var xhr = option.xhr || new XMLHttpRequest(); xhr.timeout = app.fileTimeout; xhr.open('POST', app.getItem(app.localKey.url) + option.url, true); xhr.onreadystatechange = function() { if (xhr.readyState == 4 && xhr.status == 200) { var r = xhr.responseText; if (r) { r = JSON.parse(r); } if (_ajaxCount == $ajaxCount) { option.success && option.success(r); } } } xhr.upload.onprogress = function (e) { option.progress(e); } xhr.onerror = function(e) { option.error(e); // 添加 上传失败后的回调函数 } xhr.ontimeout = function(e){ option.timeout(e); app.closeWaiting(); $.toast("请求超时,请重试"); xhr.abort(); } xhr.send(option.data);},} |
拓展：后端NodeJS实现代码
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | const express = require("express");const multer = require("multer");const expressStatic = require("express-static");const fs = require("fs");let server = express();let upload = multer({ dest: __dirname+'/uploads/' })// 处理提交文件的post请求server.post('/upload_file', upload.single('file'), function (req, res, next) { console.log("file信息", req.file); fs.rename(req.file.path, req.file.path+"."+req.file.mimetype.split("/").pop(), ()=>{ res.send({status: 1000}) })})// 处理静态目录server.use(expressStatic(__dirname+"/www"))// 监听服务server.listen(8080, function(){}); |
到此这篇关于Html5 new XMLHttpRequest()监听附件上传进度的文章就介绍到这了,更多相关Html5 监听附件上传内容请搜索IT俱乐部以前的文章或继续浏览下面的相关文章，希望大家以后多多支持IT俱乐部！
