Using JavaScript to Change Server-Side TextBox

[ftbadolato]

I have the following TextBox on my .aspx page. top: 632px" runat="server" Width="1px" Height="1px" ReadOnly="false">no The JavaScript from viewing the source is as follows. There is some JS above what you see here, but it is working fine. I also have a try...catch around all of this. The error that occurs is [object Error] and it occurs on the lines below when I attempt to set the value of the text box. The text box is on the page, but I am thinking it may have something to do with the runat="server" in the code above. I need that though b/c I check the field in my code-behind file as well. I need help on updating the value of this field via JavaScript. if(result == true){ document.getElementById('aspnetForm._ctl0_ContentP laceHolder1_hdnresultbox').value='yes'; }else{ document.getElementById('aspnetForm._ctl0_ContentP laceHolder1_hdnresultbox').value='no'; } return result;

[ftbadolato]

Sorry....textbox code did not post. no

[Michael Bisbjerg]

Well, serverside the ID of the textbox is not: "aspnetForm._ctl0_Conten...". But rather the ID itself at designtime: "hdnresultbox". Tried that?

[Guffa]

As I can't see the controls surrounding the TextBox, I don't know exactly what the client id will be, but aspnetForm. is definitely not part of the id.

Despite everything, the person most likely to be fooling you next is yourself.

[Christian Graus]

Use the ClientID property on the server side to write the id to a variable, then it will always be right.

Christian Graus Please read this if you don't understand the answer I've given you "also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )