Select Index Change Event Fired Every time as country select from dropdown

Question

2.33/5 (3 votes)

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I have dropdown that is filled by country
on selectindexchange of country it populates city dropdown

as user change country from dropdown selecindex event get fired every time to
populate city

it occurs 10000 times per day ( some time server takes 30 sec to 1 min )

is there any solution to controll selectindex change event of dropdown every time ?
or any better solution ?

thanks

Posted 10-Oct-12 9:20am

qasimidl

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Comments

I.explore.code 10-Oct-12 15:29pm

I am not quite sure I understand your question. What do you mean by "control selected index changed event"? Can you please use "Improve Question" to add some details? perhaps your code as well.

3 solutions

Solution 2

Hi,

I understand your question, I do not know if it will work or not just a suggestion I can give that, while populating the country list you should populate the state dropdown there and then store the individual data tables into some view state variables. Then according to the selected country you can assign the data table from session variable to that state drop-down.

Thanks
Tapan kumar

Posted 10-Oct-12 10:35am

Mr. Tapan Kumar

Solution 3

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Posted 8-Jan-13 18:04pm

pradeep131313

Comments

prashant patil 4987 9-Jan-13 0:44am

if you don't know the answer, then do write anything inside solution block.
and don't do such a stupid things.

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Sergey Alexandrovich Kryukov · Accepted Answer · 2012-10-10T09:27:00

Solution 1

I see. It's way too easy to "AJAX the performance down". Just design it better. Don't do it on this event. Create a separate control (button?) which will only invoke request if all or most of data is already selected/entered. It could be possible even through the Web form, if designed accurately, having both user experience and performance in mind.

It's hard to help with a proper design more, without having full description of the problem, goals, use cases, etc. But I know for sure how amazing could be the effect of simple goal-oriented design.

—SA

Posted 10-Oct-12 9:27am

Sergey Alexandrovich Kryukov

Comments

I.explore.code 10-Oct-12 15:41pm

do u reckon its the viewstate size that's the source of his sorrows?

Sergey Alexandrovich Kryukov 10-Oct-12 16:14pm

I think it's the frequency of redundant postbacks.
--SA

I.explore.code 10-Oct-12 16:19pm

oh u mean if cities get fetched for the first time you select a country, they should be somehow cached so that they don't have to be fetched from the DB again?

Sergey Alexandrovich Kryukov 10-Oct-12 16:37pm

I don't know how quite exactly... it would be good if OP shows some code sample, to avoid redundant guesswork.
--SA

fjdiewornncalwe 10-Oct-12 16:36pm

+5. Good Advice

Sergey Alexandrovich Kryukov 10-Oct-12 16:37pm

Thank you, Marcus.
--SA