Upload Files Like Gmail
Now we can see ajax everywhere. Most of the famous websites are now enabled ajax for providing faster navigation and browsing speed.
If you are a gmail user, the thing you noticed very attractively should be the file attaching part of the email composing window.
If you wait for sometime you can see, your file gets automatically uploaded without submitting the whole form. This is not Ajax. Because XMLHttpRequest (XHR) is not supporting multipart/form-data.
You can use iframe for this purpose by pointing the target of form submission towards the iframe (you can place it as hidden style=”display:none”)
<form target=”iframename” action=”upload.php”>
You can write javascript at the upload.php end, you can change the file uploaded updations just like ajax
Sample code for this “Ajax File Upload” or Gmail-Like File Upload is here :
File-Upload-Like-Gmail.rar
Thanks and Regards
Sajith.M.R
- Gmail Architecture
- Upload Files Like Gmail
- Gmail Chat Implementation
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December 11th, 2007 at 1:31 pm
AJAX is very handy and effective tool for any Rich Web Application. However it has few limitations too:
1) It can not make a remote call to another server.
2) It can not post anything to the server other than text.
But don’t let this effect you ! All this can still be done with a little work around.
For more details: www.rochakchauhan.com
April 9th, 2008 at 12:45 pm
I have soe problem about upload file in hidden iframe, would you pls give me some suggestion????
I have make a form and submit it through AJAX, and everything is work. And now I would like to provide a file upload function. I would like to keep my form submit in AJAX way, but file upload must upload through form.submit().
The problem is when I use ajax to post a form while the file is still under uploading, the ajax request would ignore the file upload. So what can I do to make it wait untill the file is fully upload?
April 9th, 2008 at 1:05 pm
XMLHTTP Request does not support multipart data. So upto now (April 2008) there is no file uploading via ajax is possible. And form javascript , you can get the intermediate information of a file uploading. So mere javascript cant create a progress bar or anything with this file uploading. You can use applet or some activeX script for this purpose. Then what you can do with ajax is after uploading , you can make the needful changes.
May 23rd, 2008 at 1:47 am
Sajith, Excellent articles. I like the step by step writing style.
One interesting thing about GMAIL file upload is that it handles the browser’s back button elegantly. Most Iframe based file upload solutions create an entry into the browsers history (BACK/FORWARD button). IE is very easy to trick but Opera is very unforgiving. GMAIL however works fine even with OPera. I dont know how they manage to do it. do you?
August 18th, 2008 at 2:57 pm
I test your script and I meet the following :
- as far the input point to hiddenframe how I will escape from form using html redirect tag ? - other suggestion ?
Thanks.