Ajax文件上传并添加Bootstrap进度条

１、项目中需要用到文件上传和显示进度，网上各种插件搞得头晕，决定自己实现一个

三个步骤：Ajax上传文件，获取上传进度，显示进度

html:

<!DOCTYPE HTML>
<html>
<head>
    <meta charset="utf-8">
    <title>jQuery File Upload Example</title>
 
    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"
          integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
 
    <!-- 可选的 Bootstrap 主题文件（一般不用引入） -->
    <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap-theme.min.css"
          integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">
 
    <!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
    <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"
            integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa"
            crossorigin="anonymous"></script>
 
 
</head>
<body>
<form action="/upload_ajax/" enctype="multipart/form-data" method="POST">
 
    <input type="file" id="file"/>
</form>
 
<button id="btn">上传</button>
 
<div class="progress" style="width: 500px">
    <div id="progress-bar" class="progress-bar progress-bar-success progress-bar-striped" role="progressbar"
         aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" style="width: 0%">
        <span class="sr-only">40% Complete (success)</span>
    </div>
</div>
 
<script src="/static/js/jquery-1.9.1.min.js"></script>
<script>
    $(function () {
        $("#btn").on('click', function () {
            UploadFile();
        });
 
        $("#file").change(function () {
            $("#progress-bar").css("width", 0);
        });
 
        // ajax + jQuery上传
        function UploadFile() {
            var xhrOnProgress = function (fun) {
                xhrOnProgress.onprogress = fun; //绑定监听
                //使用闭包实现监听绑
                return function () {
                    //通过$.ajaxSettings.xhr();获得XMLHttpRequest对象
                    var xhr = $.ajaxSettings.xhr();
                    //判断监听函数是否为函数
                    if (typeof xhrOnProgress.onprogress !== 'function')
                        return xhr;
                    //如果有监听函数并且xhr对象支持绑定时就把监听函数绑定上去
                    if (xhrOnProgress.onprogress && xhr.upload) {
                        xhr.upload.onprogress = xhrOnProgress.onprogress;
                    }
                    return xhr;
                }
            }
 
            var file = $("#file")[0].files[0];
            var form = new FormData();
            form.append('myfile', file);
            form.append("csrfmiddlewaretoken", '{{ csrf_token }}');
            $.ajax({
                type: 'POST',
                url: '/uploadFile/',
                data: form,
                processData: false,  // 告诉jquery不转换数据
                contentType: false,  // 告诉jquery不设置内容格式
                xhr: xhrOnProgress(function (e) {
                    var percent = e.loaded / e.total;
                    $("#progress-bar").css("width", (percent * 500));
                }),
 
                success: function (arg) {
                    console.log(arg);
 
                }
            })
        }
    });
</script>
</body>
</html>

后台：

def upload_file(request):
    if request.method == "POST":  # 请求方法为POST时，进行处理
        myFile = request.FILES.get("myfile", None)  # 获取上传的文件，如果没有文件，则默认为None
        if not myFile:
            return HttpResponse("no files for upload!")
        destination = open(os.path.join("/root/Desktop", myFile.name), 'wb+')  # 打开特定的文件进行二进制的写操作
        for chunk in myFile.chunks():  # 分块写入文件
            destination.write(chunk)
        destination.close()
        return HttpResponse(myFile.name)