JavaScript runtime error

Question

1.80/5 (2 votes)

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Hi,

I am a beginner in web development especially in client side scripting. I get an exception

"0x800a1391 - JavaScript runtime error: 'cmbThemes' is undefined"

in the below code.

Please help me fix this.

JavaScript

function(s, e){
if(cmbThemes.SelectedText=="Glass"){
alert ('Glass');
}

Posted 19-Nov-13 0:19am

Rahul Krishnan R

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Comments

Taha Akhtar 19-Nov-13 6:23am

First you should get what is cmbThemes?

use
debugger; in your console window of browser for debugging.

Rahul Krishnan R 19-Nov-13 6:58am

cmbThemes is the id of the combo box

3 solutions

Solution 1

SQL

function(s, e){
var cmbThemes=document.getElementById('cmbThemes')

if(cmbThemes.options[cmbThemes.selectedIndex].text=="Glass"){
alert ('Glass');
}

You can also use jquery for it

$("#cmbThemes option:selected").text();

Posted 19-Nov-13 0:55am

Rahul_Pandit

Updated 19-Nov-13 1:50am

v4

Comments

Rahul Krishnan R 20-Nov-13 0:05am

I get the below error when I tried the code:

"0x800a138f - JavaScript runtime error: Unable to get property 'options' of undefined or null reference"

Rahul Krishnan R 26-Nov-13 1:53am

Hi,
I am using devexpress webcontrols and jquery not seem to work in those controls

Solution 2

I couldn't get the above code to work. Even I tried with some other scenarios with button control like below

JavaScript

function(s, e) {
var lblSignin=document.getElementById('lblSignin');
lblSignin.style.backgroundColor = "#FF6600";
}

Here I want to change the background color of the label lblSignin on a button click event. But I end up with below error on click event:

" 0x800a138f - JavaScript runtime error: Unable to get property 'style' of undefined or null reference "

Please help me fix this issue....!!!!

FYI I am using DevExpress controls.

Thanks in advancex

Posted 25-Nov-13 20:05pm

Rahul Krishnan R

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Rahul Krishnan R · Accepted Answer · 2013-11-26T00:47:00

Hi,

Changed ClientIDMode property to Static and got the solution solved.

Got this from ASP.net forum

XML

ASP.NET provides multiple algorithms for how to generate the ClientID property value. You select which algorithm to use for a control by setting its ClientIDMode property. The algorithms are identified by the ClientIDMode enumeration values that are listed in the following table.

<div class="caption"></div> <div class="tableSection">
Value

Description

AutoID

The ClientID value is generated by concatenating the ID values of each parent naming container with the ID value of the control. In data-binding scenarios where multiple instances of a control are rendered, an incrementing value is inserted in front of the control's ID value. Each segment is separated by an underscore character (_). This algorithm was used in versions of ASP.NET earlier than ASP.NET 4.

Static

The ClientID value is set to the value of the ID property. If the control is a naming container, the control is used as the top of the hierarchy of naming containers for any controls that it contains.

Predictable

This algorithm is used for controls that are in data-bound controls. The ClientID value is generated by concatenating the ClientID value of the parent naming container with the ID value of the control. If the control is a data-bound control that generates multiple rows, the value of the data field specified in the ClientIDRowSuffix property is added at the end. For the GridView control, multiple data fields can be specified. If the ClientIDRowSuffix property is blank, a sequential number is added at the end instead of a data-field value. Each segment is separated by an underscore character (_).

Inherit

The control inherits the ClientIDMode setting of its NamingContainer control.

</div>
The default value of ClientIDMode for a page is Predictable. The default value of ClientIDMode for a control is Inherit. Because the default for controls is Inherit, the default generation mode is Predictable. (However, if you use Visual Studio to convert a Web project to ASP.NET 4 from an earlier version, Visual Studio automatically sets the site default to AutoID in the Web.config file.)