通过ajax上传文件不再需要Iframes。我最近自己做过。查看以下页面：

使用AJAX和jQuery上传HTML5文件

http://dev.w3.org/2006/webapi/FileAPI/#FileReader-界面

更新了答案并进行了清理。使用getSize函数检查大小或使用getType函数检查类型。添加了progressbar html和css代码。

var Upload = function (file) {
    this.file = file;
};

Upload.prototype.getType = function() {
    return this.file.type;
};
Upload.prototype.getSize = function() {
    return this.file.size;
};
Upload.prototype.getName = function() {
    return this.file.name;
};
Upload.prototype.doUpload = function () {
    var that = this;
    var formData = new FormData();

    // add assoc key values, this will be posts values
    formData.append("file", this.file, this.getName());
    formData.append("upload_file", true);

    $.ajax({
        type: "POST",
        url: "script",
        xhr: function () {
            var myXhr = $.ajaxSettings.xhr();
            if (myXhr.upload) {
                myXhr.upload.addEventListener('progress', that.progressHandling, false);
            }
            return myXhr;
        },
        success: function (data) {
            // your callback here
        },
        error: function (error) {
            // handle error
        },
        async: true,
        data: formData,
        cache: false,
        contentType: false,
        processData: false,
        timeout: 60000
    });
};

Upload.prototype.progressHandling = function (event) {
    var percent = 0;
    var position = event.loaded || event.position;
    var total = event.total;
    var progress_bar_id = "#progress-wrp";
    if (event.lengthComputable) {
        percent = Math.ceil(position / total * 100);
    }
    // update progressbars classes so it fits your code
    $(progress_bar_id + " .progress-bar").css("width", +percent + "%");
    $(progress_bar_id + " .status").text(percent + "%");
};

如何使用Upload类

//Change id to your id
$("#ingredient_file").on("change", function (e) {
    var file = $(this)[0].files[0];
    var upload = new Upload(file);

    // maby check size or type here with upload.getSize() and upload.getType()

    // execute upload
    upload.doUpload();
});

Progressbar html代码

<div id="progress-wrp">
    <div class="progress-bar"></div>
    <div class="status">0%</div>
</div>

Progressbar css代码

#progress-wrp {
  border: 1px solid #0099CC;
  padding: 1px;
  position: relative;
  height: 30px;
  border-radius: 3px;
  margin: 10px;
  text-align: left;
  background: #fff;
  box-shadow: inset 1px 3px 6px rgba(0, 0, 0, 0.12);
}

#progress-wrp .progress-bar {
  height: 100%;
  border-radius: 3px;
  background-color: #f39ac7;
  width: 0;
  box-shadow: inset 1px 1px 10px rgba(0, 0, 0, 0.11);
}

#progress-wrp .status {
  top: 3px;
  left: 50%;
  position: absolute;
  display: inline-block;
  color: #000000;
}

使用隐藏的iframe并将表单的目标设置为该iframe的名称。这样，当提交表单时，只会刷新iframe。为iframe的加载事件注册一个事件处理程序，以解析响应。

使用FormData。它工作得很好：-）。。。

var jform = new FormData();
jform.append('user',$('#user').val());
jform.append('image',$('#image').get(0).files[0]); // Here's the important bit

$.ajax({
    url: '/your-form-processing-page-url-here',
    type: 'POST',
    data: jform,
    dataType: 'json',
    mimeType: 'multipart/form-data', // this too
    contentType: false,
    cache: false,
    processData: false,
    success: function(data, status, jqXHR){
        alert('Hooray! All is well.');
        console.log(data);
        console.log(status);
        console.log(jqXHR);

    },
    error: function(jqXHR,status,error){
        // Hopefully we should never reach here
        console.log(jqXHR);
        console.log(status);
        console.log(error);
    }
});

我用简单的代码处理了这些问题。您可以从这里下载工作演示

就你的情况而言，这些都是可能的。我将逐步介绍如何使用AJAX jquery将文件上传到服务器。

首先让我们创建一个HTML文件，添加如下表单文件元素，如下所示。

<form action="" id="formContent" method="post" enctype="multipart/form-data" >
         <input  type="file" name="file"  required id="upload">
         <button class="submitI" >Upload Image</button> 
</form>

其次，创建一个jquery.js文件，并添加以下代码来处理向服务器提交的文件

    $("#formContent").submit(function(e){
        e.preventDefault();

    var formdata = new FormData(this);

        $.ajax({
            url: "ajax_upload_image.php",
            type: "POST",
            data: formdata,
            mimeTypes:"multipart/form-data",
            contentType: false,
            cache: false,
            processData: false,
            success: function(){
                alert("file successfully submitted");
            },error: function(){
                alert("okey");
            }
         });
      });
    });

你完成了。查看更多信息

$（“#form id”）.submit（函数（e）{e.预防违约（）；});$（“#form id”）.submit（函数（e）{var formObj=$（此）；var formURL=formObj.attr（“操作”）；var formData=新的formData（this）；$.ajax美元({url:formURL，类型：'POST'，data:formData，processData:false，contentType：false，异步：true，缓存：false，enctype:“multipart/form data”，dataType:“json”，成功：函数（数据）{if（data.success）{警报（data.success）} if（data.error）{警报（data.error）} }});});<script src=“https://cdnjs.cloudflare.com/ajax/libs/jquery/1.7.1/jquery.min.js“></script><form class=“form horizontal”id=“form id”action=“masterFileController”enctype=“multipart/form data”><button class=“btn success btn”type=“submit”id=“btn save”>提交</button></form>

servlet响应为“out.print（“您的响应”）；”

2019年更新：

html

<form class="fr" method='POST' enctype="multipart/form-data"> {% csrf_token %}
<textarea name='text'>
<input name='example_image'>
<button type="submit">
</form>

js

$(document).on('submit', '.fr', function(){

    $.ajax({ 
        type: 'post', 
        url: url, <--- you insert proper URL path to call your views.py function here.
        enctype: 'multipart/form-data',
        processData: false,
        contentType: false,
        data: new FormData(this) ,
        success: function(data) {
             console.log(data);
        }
        });
        return false;

    });

视图.py

form = ThisForm(request.POST, request.FILES)

if form.is_valid():
    text = form.cleaned_data.get("text")
    example_image = request.FILES['example_image']