Calling a JavaScript function on change of a combobox value from .cs Page

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My dropdown combobox has many values like

'Is'
'Is Not'
'Between'

I want to call a clientside Javascript function on selection of 'Between' option. How do I do it ?
What should I do in the .cs page to call the method ?

I have added the below code to register the control I want to use. Now how do I call the function in JS when its value is changed ?

Page.ClientScript.RegisterStartupScript(this.GetType(), "GetTextBoxForBetween", "var cboGLSubTransactionType = '" + cboGLSubTransactionType.ClientID + @"'", true);

Posted 19-Nov-13 2:55am

Divakar Raj M

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Rahul_Pandit 19-Nov-13 9:44am

You can use it on selectedindex_changed at server side

Sergey Alexandrovich Kryukov 19-Nov-13 10:49am

You never ever call JavaScript from .cs page. JavaScript is on client side, .cs on server side.
Server side can only generate script or call parameters, and the JavaScript method can be called, say, when a document is ready.
—SA

anglo0072 19-Nov-13 16:40pm

are you trying to call a registered javascript function from code behind to js?
well whenever we have to call javascript function we have to register it on codebehind as you did it
and whenever we have to pass a value from code behind to js we need to create a webservice and then call this webservice by using Ajax Post method

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vinay.Singh · Accepted Answer · 2013-11-19T19:53:00

Solution 1

hi check the below code

C#

dropdownost1.Attributes.Add("onchange","javascript:yourjsfunction()");

Posted 19-Nov-13 19:53pm

vinay.Singh

*Suvabrata Roy* · Accepted Answer · 2013-11-19T20:12:00

Solution 2

Hi,

just add

HTML

onchange="javascript:yourfunc();"

at your Html

and in javascript

JavaScript

funnction yourfunc()
{
//Please add Jquery 
var val=$('Id').val();
if(val=="Between")
{
// your code
}
}

Posted 19-Nov-13 20:12pm

Suvabrata Roy

chauhanvatsal · Accepted Answer · 2013-11-19T20:21:00

at client side

function GetCombobox(value)
{
var dropvalue = document.getElementById(value)
alert(dropvalue);
}

then in .cs page at SelectedIndexChanged event write this code

drpdownlist.Attributes.Add("OnChange","javascript:Getcombobox('"+drpdownlist.ClienId+"')")

kapil0411 · Accepted Answer · 2013-11-19T21:59:00

in cs fill on change event of dropdown list call your java script function on this way:-

ScriptManager.RegisterStartupScript(Page, this.GetType(), "CallJS", "JSFunctionName();", true);

and in your form write your java script function.

function JSFunctionName() {

alert("1");
}

Calling a JavaScript function on change of a combobox value from .cs Page

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