HTML Form Method Problem

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XML

<form name="frn" action="download.php?f=sample">
 <input type="submit" name="am" value="submit"/>
</form>

Why the above form is submitted to following?

download.php

If method='GET' is mentioned, why the form submits to following?

download.php?am=submit

if method='POST' is used, then only it submits to the original action string

download.php?f=sample

Why?

Posted 6-Apr-11 1:20am

ChandanPatra

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Wild-Programmer · Answer 1 · 2011-04-06T03:00:00

Solution 1

You need to know the basics about GET and POST method.

Please study the basics here:

http://www.plus2net.com/asp-tutorial/form-diff.php[^]

http://www.cs.tut.fi/~jkorpela/forms/methods.html[^]

Posted 6-Apr-11 3:00am

Wild-Programmer

Manfred Rudolf Bihy · Answer 2 · 2011-04-06T03:11:00

The reason for this is the meaning for GET and POST of the attribute method of the form tag:

GET :: All data of the submitted form will be encoded as URL parameters
POST :: All data of the submitted form will be sent in the request header

That implies when you set the method to GET the field am with a value of "submit" will be sent in the parameters attached to the URL. If the method is set to POST the field names and values will be sent in the request header and thus the url will not have to be modified.
There actually is no reason to try what you did though. If you want some additional parameter to be submitted with the other form data you can just include a hidden field:

XML

<input type="hidden" name="f" value"sample" />

Field f will not be diplayed, but it will be sent in the request when the form is submitted.
And using method GET or POST will both yield the expected results.

Cheers and happy coding!

-MRB

ChandanPatra · Answer 3 · 2011-04-06T03:25:00

Solution 3

Thanks to both of you. Good replies.

Posted 6-Apr-11 3:25am