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Need to fill dropdown data based on another drop down

What I am looking for is I have two columns of data in a sql database, here is what it looks like:

Table si_item_types
Item            Type
Monitor            Large CRT
Monitor            LCD 17
Monitor            LCD 19
Monitor            LCD Large
Monitor            Small CRT
PC            Windows 2000
PC            Windows XP
Phone            4621SW
Phone            8410B
Phone            8410D

Table si_item

What I want to do is have one drop down with Monitor, PC and Phone and if you select Monitor lets says it will display all the items in si_item_types that have the Item Monitor in the second dropdown. Do I need to use Javascript or can I use PHP to do this, can some one point me in the right direction. Thanks
1 Solution
Murali MurugesanFull stack Java developerCommented:
I think javascript would do, since i dont know PHP ;-).

Use Onchange  event on the Select box for drop down with Monitor, PC and Phone.

In the Onchange function submit the form with the selected value and query the db using tht and re-populate the other drop down.

<select name="item" OnChange="sendValue(this.value)">


 function sendValue(selValue){
  //send it to the action as query param.

There are many similar questions + answers on the net. Please refer to some of them:
- http://www.experts-exchange.com/Programming/Languages/Scripting/AJAX/Q_23687497.html
- http://codestips.com/php-ajax-cascading-dropdown-using-mysql/

As in your case, it requires communication between client and server for fetching data. Therefore, just javascript would not be sufficient to do the job. If you insist, it can be done with just javascript but all data need to be loaded in advance.

See if those examples up there can answer your question.

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