如何使用 iframe 进行异步(AJAX)文件上传? [英] How to make Asynchronous(AJAX) File Upload using iframe?

问题描述

我正在尝试上传 ajax 文件.我读到如果不使用 iframe 就不可能做到这一点.
我写道:

I'm trying to make ajax file upload . I read that it is not possible to do that without using iframe .
I wrote :

<iframe id="uploadTrg" name="uploadTrg" height="0" width="0" frameborder="0" scrolling="yes"></iframe>
<form id="myForm" action="file-component" method="post" enctype="multipart/form-data"  target="uploadTrg">
File: <input type="file" name="file">
<input type="submit" value="Submit" id="submitBtn"/>
</form>

并使用 jquery 表单插件:

and using jquery form plugin :

$('#myForm').ajaxForm({
    dataType:  'json',
    success:   function(data){
        alert(data.toSource());
    }
});

结果:

文件上传成功，我可以看到上传的文件，但是出现一个对话框:

the file is uploaded successfully and I can see the uploaded file , but a dialog box appears :

因为我发回一个json结果来显示文件名+大小等..

since I send back a json result to display the file name + size etc ..

我的问题:我怎样才能使用 iFrame 来制作 "ajax文件上传".

My Question : How can I use the iFrame to be able to make " ajax file upload".

注意:

1. 如果有更合适/更简单的解决方案，我不喜欢使用特殊插件来上传文件.
2. 我使用 jsp/servlets 作为服务器端语言 .. 但我认为我使用哪种语言没有意义.

谢谢

推荐答案

我会回答我的问题，我想我找到了解决方案.这些是我为实现目标而遵循的步骤:

I will answer my question , I think I found the solution. These are the steps that I followed to achieve the goal :

1. 使表单的属性目标"指向iframe".
2. 使用普通的 HTML 请求(不是异步/Ajax 请求)提交表单.
3. 因为目标框架是 iframe ，所以不会刷新整个页面——只刷新 iframe.
4. 一旦 iframe onload 事件发生(使用 Javascript 捕获该事件)然后做你想做的事，例如您可以发回请求以列出最近上传的文件信息.

1. Make the attribute "target" of the form point to " iframe " .
2. Use a normal HTML request ( not Asynchronous/Ajax request ) to submit the form.
3. Because the target frame is iframe , the whole page will not be refreshed - just the iframe.
4. Once iframe onload event happens (capture that event using Javascript) then do what you want, e.g. You can send back a request to list recent uploaded file info.

最终代码如下:

    <!-- Attach a file -->

    <iframe id="uploadTrg" name="uploadTrg" height="0" width="0" frameborder="0" scrolling="yes"></iframe>

    <form id="myForm" action="http://example.com/file-upload-service" method="post" enctype="multipart/form-data"  target="uploadTrg">

        File: <input type="file" name="file">
        <input type="submit" value="Submit" id="submitBtn"/>

    </form>

    <div id="ajaxResultTest"></div>

javascript:

javascript :

$("iframe").load(function(){
    // ok , now you know that the file is uploaded , you can do what you want , for example tell the user that the file is uploaded 
    alert("The file is uploaded");

    // or you can has your own technique to display the uploaded file name + id ? 
    $.post('http://example.com/file-upload-service?do=getLastFile',null,function(attachment){

       // add the last uploaded file , so the user can see the uploaded files
       $("#ajaxResultTest").append("<h4>" + attachment.name + ":" + attachment.id "</h4>");

    },'json');
});

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