<script language="JavaScript">
// LTrim(string) : Returns a copy of a string without leading spaces.
function ltrim(str)
{
var whitespace = new String(" \t\n\r");
var s = new String(str);
if (whitespace.indexOf(s.charAt(0)) != -1) {
var j=0, i = s.length;
while (j < i && whitespace.indexOf(s.charAt(j)) != -1)
j++;
s = s.substring(j, i);
}
return s;
}
//RTrim(string) : Returns a copy of a string without trailing spaces.
function rtrim(str)
{
var whitespace = new String(" \t\n\r");
var s = new String(str);
if (whitespace.indexOf(s.charAt(s.length-1)) != -1) {
var i = s.length - 1; // Get length of string
while (i >= 0 && whitespace.indexOf(s.charAt(i)) != -1)
i--;
s = s.substring(0, i+1);
}
return s;
}
// Trim(string) : Returns a copy of a string without leading or trailing spaces
function trim(str) {
return rtrim(ltrim(str));
}
//********** Call trim ***********// if(trim(value))=="")
{
alert('null value');
}
</script>