?
Solved

html form upload file using browse

Posted on 2008-06-17
8
Medium Priority
?
218 Views
Last Modified: 2011-09-20
I have a long form that allows a user to upload an image.

There is a lot of validation required and if a users input does not validate an error message is printed and the form is refreshed with all the input entered so far.

So far so good.

the input in the upload image 'browse' is lost when the form is refreshed.

Where can I find this info so I can reprint what was previously entered?
0
Comment
Question by:rwhubbard996
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2
  • 2
8 Comments
 
LVL 29

Expert Comment

by:rdivilbiss
ID: 21809197
You have no access to that information in any modern browser, sorry.  If you could access that directly you could upload ANY file from the user's computer without their permission.
0
 
LVL 36

Expert Comment

by:Loganathan Natarajan
ID: 21811389
Yes, it is too complex to do that on this condition. better try to use AJAX to avoid the page refresh OR when you submit try to upload the files and display them near the control it is uploaded ... facility to remove / confirm to upload ... something like,.,
0
 
LVL 36

Expert Comment

by:Loganathan Natarajan
ID: 21811392
>> Where can I find this info so I can reprint what was previously entered?

you cannot reprint to the control ., but you can get the value / name selected the files and display them
0
WordPress Tutorial 4: Recommended Plugins

Now that you have WordPress installed, understand the interface, and know how to install new parts, let’s take a look at our recommended plugins.

 
LVL 29

Expert Comment

by:rdivilbiss
ID: 21813713
Or do an initial validation in JavaScript before your server side checks.

Also watch out for echoing user input back to the fields...open your form for XSS.
0
 

Author Comment

by:rwhubbard996
ID: 21814758
I was trying to be so clear with my question, sorry not sure I was.

I haven't used the 'browse'  function before and feeling the pressure of a deadline posted the question hoping for a simple solution.

Now at the start of the day and after reading the comments I started thinking (always good for a developer to think :-) ).

The 'browse' is a javascript function? I'm, thinking it must be a client side script of some sort to see the users files.  The information that gets printed in the window, the file name and path, is partially visible in the $_FILE array.  I can access the file name but not the path.

Right now I'm not in a position to dissect the inner workings of this function.  

My guess is if I can grab the path and file name I can put it back in the text field of the form so the user doesn't  have to enter it again.

After reading the comments I'm doubting my 'guess'.  The client server divide may prevent what seemed simple at first glance.

Any further clarification would be appreciated.

Thanks
0
 
LVL 29

Accepted Solution

by:
rdivilbiss earned 2000 total points
ID: 21815551
If you look at the data from a for upload (say using Live HTTP Headers for FF) you'll see the name-value pairs passed in clear text followed by a form multipart line, then the BASE64 encoded contents of the file the user chose to upload via your form.

You'll get the filename as well.

From the aspect of manipulating what is displayed on the user's browser, you can use script to manipulate nearly every aspect of the page "EXCEPT" a file control.  It isn't that you cant see the filename once it is uploaded, but you have no way of filling a file field with any data, even if your purpose is simply to redisplay what the user already chose.

That is the protocol for the file field as specified by the W3C and is how all browsers implemented the field.
0
 
LVL 29

Expert Comment

by:rdivilbiss
ID: 21815606
0
 

Author Closing Comment

by:rwhubbard996
ID: 31468170
Thanks, that really clarifies the issue!
0

Featured Post

Moving data to the cloud? Find out if you’re ready

Before moving to the cloud, it is important to carefully define your db needs, plan for the migration & understand prod. environment. This wp explains how to define what you need from a cloud provider, plan for the migration & what putting a cloud solution into practice entails.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

There’s a good reason for why it’s called a homepage – it closely resembles that of a physical house and the only real difference is that it’s online. Your website’s homepage is where people come to visit you. It’s the family room of your website wh…
Australian government abolished Visa 457 earlier this April and this article describes how this decision might affect Australian IT scene and IT experts.
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.
Video by: Mark
This lesson goes over how to construct ordered and unordered lists and how to create hyperlinks.
Suggested Courses

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question