How to find if argument is numeric or not, using Javascript

Use the code below:

// checks to see whether the input is a numeric string or not also includes "." and "-"
function IsNumeric(strString)
{
	var strValidChars = "0123456789.-"; // valid characters for a numeric string
	var strChar;
	var result = true;
	var i = 0
	if (strString.length == 0) return false;
	// check to see if strString consists of valid characters listed in strValidChars
	while (i < strString.length && result == true)
	{
		strChar = strString.charAt(i);
		if (strValidChars.indexOf(strChar) == -1) return false;
		i++;
	}
	return result;
}

Please feel free to use the comments form below if you have any questions or need more explanation on anything. Use the icons below to share this tutorial with your friends.

0 comments so far. Be the first one to leave a comment on this article.

Similar Tutorials:

• Javascript: Encoding Values in XML Strings for AJAX / Web 2.0
• Trim whitespaces from both ends of a string, using Javascript
• Removing Ending Whitespaces from a String (Right Trim), using Javascript
• Sleep/Pause for specified number of seconds
• Removing Whitespaces from Beginning of a String (Left Trim), using Javascript

Tutorials in 'Web Development > Javascript' (more):

• Trim whitespaces from both ends of a string, using Javascript
• Sleep/Pause for specified number of seconds
• Javascript: Encoding Values in XML Strings for AJAX / Web 2.0
• Removing Whitespaces from Beginning of a String (Left Trim), using Javascript
• How to execute a function at regular intervals using Javascript

Recent Tutorials:

• Starting with Git - Setting up remote environment for Git
• How to SSH into EC2 instance without identity file and password
• Is MySQL 5.6 slower than MySQL 5.5? No, it's faster
• Download, configure, compile, and install MySQL 5.6
• Fast, parallel restore from SQL dumps (mysqldump) for MySQL