Trim function in Javascript
function trim(inputString)
{
if (typeof inputString != "string")
{
return inputString;
}
var retValue = inputString;
var ch = retValue.substring(0, 1);
while (ch == " ")
{ // Check for spaces at the beginning of the string
retValue = retValue.substring(1, retValue.length);
ch = retValue.substring(0, 1);
}
ch = retValue.substring(retValue.length-1, retValue.length);
while (ch == " ")
{
// Check for spaces at the end of the string
retValue = retValue.substring(0, retValue.length-1);
ch = retValue.substring(retValue.length-1, retValue.length);
}
while (retValue.indexOf(" ") != -1)
{
// Note that there are two spaces in the string - look for multiple spaces within the string
retValue = retValue.substring(0, retValue.indexOf(" ")) + retValue.substring(retValue.indexOf(" ")+1, retValue.length);
// Again, there are two spaces in each of the strings
}
return retValue; // Return the trimmed string back to the user
} /
Use:
if(trim(frmFeedback("txtName").value)=='')
{
alert('Name is blank');
frmFeedback("txtName").focus();
return false;
}