Problem in Javascript Text Validation

Anurag Srivastava

when i m trying to use the variable "txtFName1" as shown below. it doesn't work in the 'if'.
Is there any way to use the variable in the 'if' in .net 3.5

var txtFName1 = (document.getElementById('<%=txtFName.ClientID %>');

            if (txtFName1== "") {
                alert("First Name field can't be left blank");
                txtFName1.focus();
                return false;
                }

Pls help
Thanx in Advance....
Eagerly waiting for the response.

6 Replies

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Ankit Nandekar15y ago
Anurag if u like any ones answer please mark it so other can refer that answer
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Anurag Srivastava15y ago
thanks
0
Anurag Srivastava15y ago
thanks for the help...it works
0
Sam Hobbs15y ago
The "<% %>" tag is for ASP but not JavaScript. Are you sure that you want ASP to put the value of txtFName.ClientID there? It will be done when the page is generated and will always be the same when the JavaScript executes. If that is what you need, then I would add diagnostic code to determine what the value is that is being put into the HTML; it might not be what you think it is.
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Ankit Nandekar15y ago
Try this it will work
function Checkusername()
    {
          var txtusername = document.getElementById('< %=TextBox2.ClientID %>');
            if (txtusername.value=="")
          {
                alert('Textbox must not be empty'); return false;

            }
            else
           {
                return true;
            }
        }
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Raja Krishnamurthy15y ago
Try this:

var txtFName1 = document.getElementById('<%=txtFName.ClientID %>').value; //you didn't get the value

            if (txtFName1== "") {
                alert("First Name field can't be left blank");
                txtFName1.focus();
                return false;
                }

HTH
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