用jQueryfile upload进度条

我想在我的项目中实现一个AJAXfile uploadfunction。 我正在使用jQuery; 我的代码使用AJAX提交数据。 我也想实现一个file upload进度条。 我该怎么做? 有什么方法可以计算已上传了多less,以便我可以计算上传的百分比并创build一个进度条?

注意:这个问题与jQuery表单插件有关 。 如果您正在寻找纯粹的jQuery解决scheme,请从这里开始 。 所有的浏览器都没有整体的jQuery解决scheme。 所以你必须使用一个插件。 我正在使用dropzone.js ,这对旧版浏览器有一个简单的回退。 你喜欢哪个插件取决于你的需求。 有很多很好的比较post,像这样 , 这个或这个 。

从例子 :

jQuery的:

$(function() { var bar = $('.bar'); var percent = $('.percent'); var status = $('#status'); $('form').ajaxForm({ beforeSend: function() { status.empty(); var percentVal = '0%'; bar.width(percentVal); percent.html(percentVal); }, uploadProgress: function(event, position, total, percentComplete) { var percentVal = percentComplete + '%'; bar.width(percentVal); percent.html(percentVal); }, complete: function(xhr) { status.html(xhr.responseText); } }); }); 

html:

 <form action="file-echo2.php" method="post" enctype="multipart/form-data"> <input type="file" name="myfile"><br> <input type="submit" value="Upload File to Server"> </form> <div class="progress"> <div class="bar"></div > <div class="percent">0%</div > </div> <div id="status"></div> 

你必须使用CSS来devise进度条…

我只使用jQuery完成这个工作:

 $.ajax({ xhr: function() { var xhr = new window.XMLHttpRequest(); xhr.upload.addEventListener("progress", function(evt) { if (evt.lengthComputable) { var percentComplete = evt.loaded / evt.total; percentComplete = parseInt(percentComplete * 100); console.log(percentComplete); if (percentComplete === 100) { } } }, false); return xhr; }, url: posturlfile, type: "POST", data: JSON.stringify(fileuploaddata), contentType: "application/json", dataType: "json", success: function(result) { console.log(result); } }); 

我在我的项目中使用了以下内容。 你也可以试试

 ajax = new XMLHttpRequest(); ajax.onreadystatechange = function () { if (ajax.status) { if (ajax.status == 200 && (ajax.readyState == 4)) { //To do tasks if any, when upload is completed } } } ajax.upload.addEventListener("progress", function (event) { var percent = (event.loaded / event.total) * 100; //percent variable can be used for modifying the length of your progress bar. console.log(percent); }); ajax.open("POST", 'your file upload link', true); ajax.send(formData); //ajax.send id for sending upload form data. 

检查了这一点: http : //hayageek.com/docs/jquery-upload-file.php我发现它意外地在网上。

如果您在您的项目中使用jQuery,并且不想从头开始实现上传机制,则可以使用https://github.com/blueimp/jQuery-File-Upload

他们有一个非常好的api与多个文件select,拖放支持,进度条,validation和预览图像,跨域支持,分块和可恢复的file upload。 他们有多种服务器语言的示例脚本(node,php,python和go)。

演示url: https : //blueimp.github.io/jQuery-File-Upload/ 。

这里是一个更加完整的jQuery 1.11.x $ .ajax()用法:

 <script type="text/javascript"> function uploadProgressHandler(event) { $("#loaded_n_total").html("Uploaded "+event.loaded+" bytes of "+event.total); var percent = (event.loaded / event.total) * 100; var progress = Math.round(percent); $("#uploadProgressBar").html(progress + " percent na ang progress"); $("#uploadProgressBar").css("width", progress + "%"); $("#status").html(progress +"% uploaded... please wait"); } function loadHandler(event) { $("#status").html(event.target.responseText); $("#uploadProgressBar").css("width", "0%"); } function errorHandler(event){ $("#status").html("Upload Failed"); } function abortHandler(event){ $("#status").html("Upload Aborted"); } $("#uploadFile").click(function(event) { event.preventDefault(); var file = $("#fileUpload")[0].files[0]; var formData = new FormData(); formData.append("file1", file); $.ajax({url: 'http://testarea.local/UploadWithProgressBar1/file_upload_parser.php', method: 'POST', type: 'POST', data: formData, contentType: false, processData: false, xhr: function() { var xhr = new window.XMLHttpRequest(); xhr.upload.addEventListener("progress", uploadProgressHandler, false ); xhr.addEventListener("load", loadHandler, false); xhr.addEventListener("error", errorHandler, false); xhr.addEventListener("abort", abortHandler, false); return xhr; } } ); } ); </script> 

JavaScript的:

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var myParent = $(this).parent(); var filname= $('input[type=file]').val() if (filname) { $(this).parent().find('#progress-div').show(); $('#myform').ajaxSubmit({ // target: '#progress-div123',/**********only for response************/ beforeSubmit: function () { myParent.find('#progress-bar').width('0%'); }, uploadProgress: function (event, position, total, percentComplete) { myParent.find('#progress-bar').width(percentComplete + '%'); myParent.find('#progress-bar').html('<div id="progress-status">' + percentComplete + ' %</div>') }, success: function showResponse(responseText, statusText, xhr, $form) { //myParent.find('#progress-div').hide(10000); }, resetForm: false }); } return false; }); /***********Error msg if file not valid***************/ $('input[type=file]').change(function () { var val = $(this).val().toLowerCase(); var regex = new RegExp("(.*?)\.(pdf|txt|jpg|png|doc|docx|xlx|xls|xlsx|jpg|ppt|pptx|tif|tiff|\n\ bmp|pcd|gif|bmp|zip|rar|odt|avi|ogg|m4a|mov|mp3|mp4|mpg|wav|wmv|stp|sldprt|sldasm|iges|igs|stl|x_t|step\n\ |stp|prt|asm|idw|iam|ipt|dxf|dwg|pdf|slddrw|dwf)$"); if (!(regex.test(val))) { $(this).val(''); alert('Please select correct file format'); } }); /*********End*****************/ }); </script> 

样式:

 <style> body{width:610px;} #uploadForm {border-top:#F0F0F0 2px solid;background:#FAF8F8;padding:10px;} #uploadForm label {margin:2px; font-size:1em; font-weight:bold;} .demoInputBox{padding:5px; border:#F0F0F0 1px solid; border-radius:4px; background-color:#FFF;} #progress-bar {background-color: #12CC1A;height:20px;color: #FFFFFF;width:0%;-webkit-transition: width .3s;-moz-transition: width .3s;transition: width .3s;} .btnSubmit{background-color:#09f;border:0;padding:10px 40px;color:#FFF;border:#F0F0F0 1px solid; border-radius:4px;} #progress-div { border: 1px solid #0fa015; border-radius: 4px; margin: -35px 2px 7px 295px; padding: 5px 0; text-align: center; width: 277px; } #targetLayer{width:100%;text-align:center;} </style>