[英]How to make Asynchronous(AJAX) File Upload using iframe?
I'm trying to make ajax file upload . 我正在尝试上传ajax文件。 I read that it is not possible to do that without using
iframe
. 我读到如果不使用
iframe
就无法做到这一点。
I wrote : 我写 :
<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>
and using jquery form plugin : 并使用jquery表单插件:
$('#myForm').ajaxForm({
dataType: 'json',
success: function(data){
alert(data.toSource());
}
});
The Result : 结果 :
the file is uploaded successfully and I can see the uploaded file , but a dialog box appears : 文件上传成功,我可以看到上传的文件,但会出现一个对话框:
since I send back a json result to display the file name + size etc .. 因为我发回一个json结果来显示文件名+大小等。
My Question : How can I use the iFrame to be able to make " ajax file upload". 我的问题:如何使用iFrame进行“ajax文件上传”。
Note: 注意:
Thanks 谢谢
I will answer my question , I think I found the solution. 我会回答我的问题,我想我找到了解决方案。 These are the steps that I followed to achieve the goal :
这些是我为实现目标而采取的步骤:
The final code looks like this: 最终代码如下所示:
<!-- 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');
});
This example taken from BugKiller. 这个例子取自BugKiller。 complete working example which allows you to upload a logo and see it immediately in the html page, following which the upload value gets cleared:
完整的工作示例,允许您上传徽标并立即在html页面中查看,然后清除上传值:
html: HTML:
<form id="uploadForm" method="post" enctype="multipart/form-data" target="uploadTrg">
<div id="fileUploadWrapper"><input type="file" name="file" id="fileUpload"></div>
<input type="submit" value="Upload" id="submitBtn"/>
</form>
<iframe id="uploadTrg" name="uploadTrg" height="0" width="0" frameborder="0" scrolling="no" style="display:none"></iframe>
<img id="imgLogo" style="border-width:0px;" />
javascript: JavaScript的:
$(document).ready(function () {
var companynumber = '12345'; //get this from the database
var logoUploadUrl = 'UploadHandler.aspx?logoupload=true&companynumber=' + companynumber ;
$("#uploadForm").attr("action", logoUploadUrl);
$("#uploadTrg").load(function () {
//upload complete
//only way to reset contents of file upload control is to recreate it
$("#fileUploadWrapper").html('<input type="file" name="file" id="fileUpload">');
//reload the logo url, add ticks on the end so browser reloads it
var ticks = ((new Date().getTime() * 10000) + 621355968000000000);
var logoUrl = 'images/clients/' + companynumber + '/client.gif?' + ticks;
$("#imgLogo").attr('src', logoUrl);
});
});
upload handler code behind (C#): 上传处理程序代码(C#):
namespace MyWebApp {
public partial class UploadHandler : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e) {
if (Request.Params["logoupload"] != null) {
string companynumber = Request.Params["companynumber"];
string savePath = Server.MapPath("\\images") + "\\clients\\" + companynumber + "\\client.gif";
if (File.Exists(savePath))
File.Delete(savePath);
//save the file to the server
Request.Files[0].SaveAs(savePath);
Response.Write("OK");
Response.Flush();
Response.End();
}
}
}
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