using AJAX to postback dropdownlist

Question

User1126057398 posted
Hello all i have VS2005 and ASP.NET 2.0 AJAX Extensions Release Candidate (RC) on my system.  I have two dropdownlist on my page eg one for displaying country and other for corresponding state ie state dropdown is dependent on country dropdown. On my web page I am using "ScriptManager1.RegisterAsyncPostBackControl(DropDownList1);" on page load. I had done it with Update Panel control and its working is Ok. But in case of ScriptManager1.RegisterAsyncPostBackControl(DropDownList1);" the results r not as expected. On selecting value from Country's dropdown nothing hapens though I had written code on country's dropdown SelectedIndexChanged event. Any help???????????

Answer 1

User-818936891 posted

hi,

 for the same refer this article.

http://www.codeproject.com/KB/ajax/dropdown_box_using_ajax.aspx

Answer 2

User1126057398 posted
Any Help!!!

Answer 3

User770037084 posted

First, make sure you have AutoPostback set to true on the DropDownList that you want to trigger a partial postback.

Second, you should consider using the CascadingDropdown extender instead of reinventing that wheel.

Answer 4

User1126057398 posted

Thanks for your reply!!! But I want to add(to my question) that right now my state dropdown list is populating with corresponding country name. But the problem is that whole of the page is postback. How can one use  "ScriptManager1.RegisterAsyncPostBackControl(DropDownList1);"  to fill the dropdown without using Update Panel.

Answer 5

User1126057398 posted

Hello Sathesh

 Thanks for your reply!!! But my problem had not solved. Can you tell me how to fill dropdownlist using AJAX but without using Update Panel.

Answer 6

User222791821 posted

Hi,

Thank you for your help!

Use webservice/pagemathod and client side javascript!

Refer to

• Exposing Web Services to Client Script

• Calling Web Services from Client Script

Best Regards,

 

Answer 7

User1126057398 posted

Hello

I want to avoid writing web service. Can you suggest me some other alternative???

Answer 8

User222791821 posted

Use Iframe, no other! 

Answer 9

User1126057398 posted
[:)]Can you explain IFrame in detail with example. Thanks in advance.