使用 jQuery 的文件上传进度条

我试图在我的项目中实现一个 AJAX 文件上传功能。我使用的是 jQuery; 我的代码使用 AJAX 提交数据。我还要实现一个文件上传进度条。我怎么能这么做？有没有办法计算已经上传了多少，以便我可以计算上传的百分比，并创建一个进度条？

428052 次浏览
小开
最佳答案

注意: 这个问题与 JQuery 表单插件有关。 没有针对所有浏览器的总体 jQuery 解决方案。所以你必须使用一个插件。我使用的是 降落区 Js，它对于较老的浏览器有一个简单的备份。您更喜欢哪个插件取决于您的需要。有很多很好的比较职位在那里。

来自 例子:

JQuery:

$(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>

你必须用 CSS 来设计进度条。

小开

看看这个: < a href = “ http://hayageek.com/docs/jquery-load-file.php”> http://hayageek.com/docs/jquery-upload-file.php 我在网上偶然发现的。

小开

我只用 jQuery 做到了这一点:

$.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);
}
});
小开

如果您在项目中使用 jquery，并且不想从头开始实现上传机制，那么可以使用 https://github.com/blueimp/jQuery-File-Upload。

他们有一个非常好的 API 与多文件选择，拖放支持，进度条，验证和预览图像，跨域支持，分块和可恢复的文件上传。他们还提供了用于多种服务器语言(node、 php、 python 和 go)的示例脚本。

示例网址: https://blueimp.github.io/jQuery-File-Upload/。

小开

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 is for uploading form data.
小开

JavaScript:

<script>
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</script>
<script type="text/javascript">
$(document).ready(function () {
$('#myform').on('change', '.wpcf7-file', function (e) {
e.preventDefault();
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>

风格:

<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>
小开

下面是一个更完整的 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>
小开

这解决了我的问题

var url = "http://localhost/tech1/index.php?route=app/upload/ajax";


$.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);
var $link = $('.'+ids);
var $img = $link.find('i');
$link.html('Uploading..('+percentComplete+'%)');
$link.append($img);
}
}, false);


return xhr;
},
url: url,
type: "POST",
data: JSON.stringify(uploaddata),
contentType: "application/json",
dataType: "json",
success: function(result) {
console.log(result);
}
});
小开

Kathir 的回答 很棒，因为他只用 jQuery 就解决了这个问题。 我只是想在他的回答中添加一些内容，使他的代码具有一个漂亮的 HTML 进度条:

$.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);


$('.progress-bar').width(percentComplete+'%');
$('.progress-bar').html(percentComplete+'%');


}
}, false);


return xhr;
},
url: posturlfile,
type: "POST",
data: JSON.stringify(fileuploaddata),
contentType: "application/json",
dataType: "json",
success: function(result) {
console.log(result);
}
});

下面是进度条的 HTML 代码，我使用 Bootstrap 3作为进度条元素:

<div class="progress" style="display:none;">
<div class="progress-bar progress-bar-success progress-bar-striped
active" role="progressbar"
aria-valuemin="0" aria-valuemax="100" style="width:0%">
0%
</div>
</div>
小开

这是一个简单的方法... ..。

/* ajax progresss                 */
$(document).on('submit', '#sync', function () {
$.ajax({
type: 'POST',
url: site_url + "sync/import_past_data",
data: {},
beforeSend: function(XMLHttpRequest)
{
console.log('2');
//Upload progress
XMLHttpRequest.upload.addEventListener("progress", function(evt){
if (evt.lengthComputable) {
var percentComplete = evt.loaded / evt.total;
$( ".jquery-uploadbar-selector" ).progressbar({ value: percentComplete }); //jquery progress bar for upload
//incase you wanted an upload bar
}
}, false);
//Download progress
XMLHttpRequest.addEventListener("progress", function(evt){
if (evt.lengthComputable) {
var percentComplete = evt.loaded / evt.total;
$( ".jquery-downloadbar-selector" ).progressbar({ value: percentComplete });
//jquery progress bar for download or in other words The real answer for question
}
}, false);
},
success: function(data){
//Here goes the end of what you have done.. I would just type..
console.log('1');
}
});
});


/* end of progress                        */

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