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VB.Net Web Page Dropdown Selector

Posted on 2007-04-02
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Last Modified: 2010-04-23
I have a need to set up a dropdown with relational linking between two databases.  I have one table with an ID on it and another with ID and location.  I need to be able to view the current location linked by ID and then click the dropdown to select a new location from the complete list of locations in the supporting table.  I am using a SQL connector.  What type of dropdown do I use?  What properties do I set to allow normal display from one table and drop-down display from another?
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Question by:slink9
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Jeff Certain earned 2000 total points
ID: 18838943
You get to write this code by hand. You really want to use AJAX for this; otherwise you have to postback the page or write a bunch of javascript. Having done both of these (pre-AJAX), I can assure you that you don't want to do this.

Check out the Telerik AJAX controls -- particularly the AJAX manager.
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by:slink9
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I don't see an AJAX for VS2003.  I forgot to mention that fact.
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by:Jeff Certain
ID: 18842569
All of the Telerik controls (www.telerik.com) can be used in either VS2003 or VS2005. The developer license for the Ajax manager only is $399. There's also a trial version available to see if it does what you want (either 30 or 90 days - I don't remember).

If you're doing this in a professional environment, the point you need to take to your boss is that this particular tool allows you "ajaxify" existing controls, specifying which ones should be the target of callbacks from other controls. In your case, you'd want combo box 2 to be the target of operations for combo box 1. In the SelectedIndexChanged event for combo box 1, you'd have to get the data that is displayed in box 2 based on the current data in box 1. You can either get all the data and cache it, then perform filters in a dataview (performs better, but then you need to worry about the cache going stale... plus it's more work) or just hit the database directly to get the data when you need it.
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