[jaishalg]

Hey all....
i have a problem
i had a dropdown menu in which i had taken name of the counties from the database (dynamic dropdown) using PHP and mysql

now i want that when user select a country it will shows only the states which belongs to the same country.

i know this is happens with the onChange using JAVASCRIPT, but i dont know how to do this...
both the drop down menu is dynamic...
when user select country, he/she had fill up some information that should not go when the page refresh...
i m really not good with JAVASCRIPT, can anyone help me for the same
a little help will be good for me.

[TwoD]

I think you could get the best looking effect by using a technique referred to as AJAX.
It's a combination of serverside languages and Javascript which relies upon the xmlHttpRequest feature. It allows you to request data from the server (it doesn't have to be xml) at any time without reloading the page. The Javascript sends some information (in your case the selected country) when the onchange event fires as you mentioned. The server handles the data and sends back the states as a list separated by some special character(s). The JavaScript is notified that the data has been retrieved and clears the state-dropdown-list. It then slices up the datastring and populates the list with new options.

The 'oldschool' way of doing this could involve a hidden frame which had its URL updated by Javascript. That way you can send along a querystring. When the data is sent back from the server, the hidden frame is updated instead of the whole page.
The server also sends along a small script (maybe just a single command) which notifies the main script that the data in the hidden frame has been updated.

I'm sorry but I don't have a good example of how to do this, but try searching for AJAX, or using hidden frames to request server data.

[mouse_whisperer]

In case it helps, I have an introductory Ajax tutorial on my website at www.mousewhisperer.co.uk/ajax_page.html