String.trim Function
Removes leading and trailing white-space characters from a String object.
var trimmedStringVar = myString.trim();
Return Value
A copy of the string with all white-space characters removed from the start and end of the string.
Remarks
Use the trim function to remove leading and trailing white-space characters from the current String object. Examples of white-space characters are spaces and tabs.
Example
The following example shows how to use the trim function to remove leading and trailing white space from a String object.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="https://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Sample</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager runat="server" ID="ScriptManager1">
</asp:ScriptManager>
<script type="text/javascript">
function runSample()
{
var myString = " A string ";
// Remove any leading and trailing white spaces.
myString = myString.trim();
alert("Test:" + myString + ".");
}
// Displays: "Test:A string."
runSample();
</script>
</form>
</body>
</html>