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[Solved] Populate combobox on SelectedIndexChange client event of other combobox

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Ajax

This is a migrated thread and some comments may be shown as answers.

Shailesh Shahane asked on 25 Jun 2009, 11:39 AM

i'm trying to trigger on demand download of one combobox on selectedindex change (Client side Javascript ) event of other combobox.
e.g.
on selected index change event of country i want to populate states in other combobox using WebMethod
here what i tried,
//Country combobox event
function onSelectedIndexChanged(sender, eventArgs) {
        var id = eventArgs._item.get_value();
       var ddlstate = $get('ddlStateComboBoxID');
        ddlstate.control._doLoadOnDemandFromWebService(id, { NumberOfItems: 0, Text: '', ID: id });
    }
It calls WebMethod and get result properly at client side.
But it is giving javascript error on callback. It seems it is not initializing other methods that required before calling _doLoadOnDemandFromWebService.
so using which method i can start populating State Combo box?

Also I'm using Grid. and inside that i have 2 comboboxes on each row. So i can not use <%= State.ClientID %> in javascript.
So I'm creating JSon object having Country combo Id as Name and State combo id as its value(Not shown in above example).
Is there any other better way to define relation.

thanks & regards,
Shailesh

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