The asp.net method GetElementById() does not have a valid element or property value

I'm currently facing a challenging issue with my asp.net page that is causing me to pull out what's left of my hair.

This latest page I put together quickly for an internal database tool utilizes the standard VS 2010 design template, meaning it makes use of the site.master page. I mention this because it could be relevant to the problem at hand.

Instead of using input type="text", I have opted to use asp:textbox controls. When one of these textboxes loses focus or 'blurs,' I need to execute a subroutine in the code-behind that performs a database lookup based on the textbox input.

All guidance I've come across suggests adding an asp:hiddenfield to trigger the code-behind event for the lookup operation. To achieve this, I utilize the document.GetElementById method within a JavaScript script to set the value in the hidden field like so: 

document.GetElementById('HiddenInfo').value = "yada-yada"
.

The issue arises when the Visual Studio development environment fails to recognize the .value property for the GetElementById command. For instance, while typing and receiving code hints, the .value parameter does not appear in the suggestions list. See illustration:

As depicted, the '.v' criterion does not prompt the appearance of the .value parameter.

I attempted different approaches such as obtaining it by ClientID and utilizing jQuery, but all efforts were fruitless. What baffles me is that I successfully implemented a similar procedure in another web page I developed, albeit without the presence of a site.master page.

Hours of searching online have yielded no solutions that match my specific dilemma.

Any thoughts or suggestions would be greatly appreciated!

Thank you!

javascriptasp.netvb.netvisual-studio-2010

Answer №1

Looks like you're dealing with an asp .net component, which means you'll need to fetch its clientid. You can achieve this using jQuery like so: 

$('#<%=HiddenInfo.ClientID %>').val();

Answer №2

After spending numerous hours searching, I finally uncovered the solution. Within the JavaScript function responsible for updating the HiddenInfo field, there is a single line of code that seems to trigger a postback and subsequently execute the _ValueChanged event in the backend code:

<script language="javascript" type="text/javascript>
function CheckCC() {
    document.getElementById('HiddenInfo').value = "YES";
    <%= ClientScript.GetPostBackEventReference(HiddenInfo, "") %>;
}

The answer was discovered here.

This solution appears to be quite obscure.

What's perplexing is that in a previous ASP.NET project I worked on, this additional step wasn't required. This inconsistency was causing me confusion, and I still can't fully grasp it. Nonetheless, I am grateful for the help provided as it has allowed me to progress.

Thank you to everyone who shared their suggestions.

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