Java Script to allow Only Numbers

This function allow only numbers, dot and dashes. If you want only numbers then remove
".-" from var strValidChars = "0123456789.-"; .


function IsNumeric(strString)
// check for valid numeric strings
{
    var strValidChars = "0123456789.-";
    var strChar;
    var blnResult = true;
   
    if (strString.length == 0) return false;
   
    // test strString consists of valid characters listed above
    for (i = 0; i < strString.length && blnResult == true; i++)
    {
    strChar = strString.charAt(i);
    if (strValidChars.indexOf(strChar) == -1)
    {
    blnResult = false;
    }
    }
    return blnResult;
}