Ajax 文件上傳進度監聽之upload.onprogress案例詳解
$.ajax實現
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta http-equiv="X-UA-Compatible" content="ie=edge" /> <title>Document</title> <script src="./libs/jquery/jquery.js"></script> <style> div { width: 0%; height: 20px; background-color: #f00; /* transition: all 0.2s; */ } </style> </head> <body> <div></div> <input type="file" /> <script> $(function() { // 用戶選擇好文件之後單擊彈出層的“打開”按鈕的觸發事件是:change $('input').on('change', function() { // 1.收集文件數據 let myfile = $('input')[0].files[0] let formdata = new FormData() formdata.append('file_data', myfile) // 2.發起ajax請求 $.ajax({ url: 'http://127.0.0.1:3001/uploadFile', type: 'post', data: formdata, processData: false, contentType: false, xhr: function() { let newxhr = new XMLHttpRequest() // 添加文件上傳的監聽 // onprogress:進度監聽事件,隻要上傳文件的進度發生瞭變化,就會自動的觸發這個事件 newxhr.upload.onprogress = function(e) { console.log(e) let percent = (e.loaded / e.total) * 100 + '%' $('div').css('width', percent) } return newxhr }, success: function(res) { console.log(res) }, dataType: 'json' }) }) }) </script> </body> </html>
原生實現:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta http-equiv="X-UA-Compatible" content="ie=edge" /> <title>Document</title> <script src="./libs/jquery/jquery.js"></script> <style> div { width: 0%; height: 20px; background-color: #f00; /* transition: all 0.2s; */ } </style> </head> <body> <div></div> <input type="file" /> <script> $(function() { // 用戶選擇好文件之後單擊彈出層的“打開”按鈕的觸發事件是:change $('input').on('change', function() { // 1.收集文件數據 let myfile = $('input')[0].files[0] let formdata = new FormData() formdata.append('file_data', myfile) let xhr = new XMLHttpRequest() xhr.open('post', 'http://127.0.0.1:3001/uploadFile') // 細節1:文件上傳,如果使用fromdata,則不要設置請求頭 xhr.upload.onprogress = function(e) { console.log(e) let percent = (e.loaded / e.total) * 100 + '%' $('div').css('width', percent) } // 細節2:send中可以直接傳遞formdata xhr.send(formdata) }) }) </script> </body> </html>
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