document.form[0] is Null or Not an Object error when hiding a text field in ASP.Net

Posted by grady on Stack Overflow See other posts from Stack Overflow or by grady
Published on 2010-04-15T08:03:52Z Indexed on 2010/04/15 8:13 UTC
Read the original article Hit count: 221

Filed under:

aspx

|

JavaScript

|

c#

Hey,

I am hiding a TextBoxin my aspx page like this:

myField.visible=false;

Now I have a DropDown as well which tries to access the TextBox on IndexChange. The problem is, it cant access the hiffen TextBox and I am getting document.form[0] is Null or Not an Object. How can I solve that? Is the some check for that in JavaScript?

Thanks :-)

© Stack Overflow or respective owner

Related posts about aspx

How to change the Target URL of EditForm.aspx, DispForm.aspx and NewForm.aspx

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
Hi All, To changing the URL of ListForms we have very limited options. On Inernet if you search you will lots of article about Customization of List Forms using SharePoint Desinger, but the disadvantage of SharePoint Desinger is, you cannot create wsp of the customization means what ever changes… >>> More
store multiple id's from first aspx page to next aspx page

as seen on Stack Overflow - Search for 'Stack Overflow'
i have my first aspx page that has data thatthe user fills in. it is in format of textbox's and at the end of it all the user clicks submit and all data goes in the database. In the database each record gets an ID field. Now when the users clicks submit and goes to the next page, i want the ID's (they… >>> More
Server.transfer causing HttpException

as seen on Stack Overflow - Search for 'Stack Overflow'
I am developing a C#/SQL ASP.NET web application in VS 2008. Currently I am using the Server.Transfer method to transfer control from one ASPX.CS file to another ASPX file. The first time through, this works. But after control is transferred to this new file it encounters a condition: if (restart… >>> More
Unofficial Prep guide for TS: Microsoft Lync Server 2010, Configuring (70-664)

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
Managing Users and Client Access (20 percent) Objective Materials Configure user accounts http://technet.microsoft.com/en-us/library/gg182543.aspx Deploy and maintain clients… >>> More
Moving a .aspx site over to nginx, need to server .aspx as static files or rewrite

as seen on Server Fault - Search for 'Server Fault'
I have a simple CMS site that was written in asp.net. My site looks like: www.example.com/ www.example.com/content/index.aspx www.example.com/content/get.aspx?id=234 (loads an article) It uses a database currently, but I am going to dump all the content to file, and then I can just pull the contents… >>> More

Related posts about JavaScript

CHAT ROOMs 7 by 6

as seen on Stack Overflow - Search for 'Stack Overflow'
I am looking for chatroom on one page with 7 loggedin users and 6+rows for say 42 users.these users will keep on adding wthnew users.Need urgent help.A PRETTY UNUSUAL Q FOR MOST OF U.What is MORE REQ new features: Usernames are unique to users currently chatting You can see a "currently chatting"… >>> More
Integrating JavaScript Unit Tests with Visual Studio

as seen on Stephen Walter - Search for 'Stephen Walter'
Modern ASP.NET web applications take full advantage of client-side JavaScript to provide better interactivity and responsiveness. If you are building an ASP.NET application in the right way, you quickly end up with lots and lots of JavaScript code. When writing server code, you should be writing… >>> More
Has Javascript developed beyond what it was originally designed to do?

as seen on Programmers - Search for 'Programmers'
I've been talking with a friend about the purpose of Javascript, when and how it should be used, etc. He quoted that: JavaScript was designed to add interactivity to HTML pages [...] JavaScript gives HTML designers a programming tool HTML authors are normally not programmers… >>> More
PHP, javascript, single quote problems with IE when passing variable from ajax post to javascript fu

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi! I have been trying to get this to work for a while, and I suspect there's an easy solution that I just can't find. My head feels like jelly and I would really appreciate any help. My main page.php makes a .post() to backend.php and fetches a list of cities which it echoes in the form of: <li… >>> More
Javascript in XSL that is loaded by Javascript

as seen on Stack Overflow - Search for 'Stack Overflow'
Is there anyway to have javascript run when a XSL sheet has been applied to an XML file by Javascript? I am using a JQuery plugin to apply the sheet to the xml but the javascript that is located inside of the XSL file will not run. I put the Javascript at the bottom of the file and it still does… >>> More