Problem in Javascript file

[pinna_hari]

Hello, I Got a problem while writing code clientside validation. I have a textbox control in default.aspx. i am writing validation(required field validation) in .Js(Seperate Javascript) file I am writing like this function validate() { var=document.getElementID("<%= textbox1.ClientID %>").value if(var=="") alert(""); } here my problem is the above code is not calling textbox control in default.aspx. please give solution... Thanks

Pinna

[Christian Graus]

You should get firefox and firebug. If you did, you would see that a seperate js file is never parsed, so your code is being written verbatim. One way around this is to do something like: var=document.getElementID(textBoxClientId).value; Then write a variable called that using the ClientID in the code behind of the page. Also, NEVER use the result of getElementByID without first checking that it's not null.

Christian Graus Please read this if you don't understand the answer I've given you. If you're still stuck, ask me for more information.