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This JavaScript code example provides us two functions to clean up and format numbers quite nicely.

One JavaScript check number function will take any decimal number, negative or positive, and formats it by adding commas every three digits. The other JavaScript number format function can strip any non-numeric characters from a string leaving you with a valid decimal number. It also considers the minus sign and the period to be numeric and will not strip them unless the minus sign is not at the beginning of the number or there is more than one period.

These JavaScript functions make use of regular expressions to do the heavy lifting.

Label: JavaScript check number, JavaScript number format, JavaScript to number, JavaScript convert number, JavaScript string number

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<script type="text/javascript">
// Created by: Justin Barlow | http://www.netlobo.com/
// This script downloaded from www.JavaScriptBank.com

// This function formats numbers by adding commas
function numberFormat(nStr){
  nStr += '';
  x = nStr.split('.');
  x1 = x[0];
  x2 = x.length > 1 ? '.' + x[1] : '';
  var rgx = /(\d+)(\d{3})/;
  while (rgx.test(x1))
    x1 = x1.replace(rgx, '$1' + ',' + '$2');
  return x1 + x2;
}

// This function removes non-numeric characters
function stripNonNumeric( str ){
  str += '';
  var rgx = /^\d|\.|-$/;
  var out = '';
  for( var i = 0; i < str.length; i++ ){
    if( rgx.test( str.charAt(i) ) ){
      if( !( ( str.charAt(i) == '.' && out.indexOf( '.' ) != -1 ) ||
             ( str.charAt(i) == '-' && out.length != 0 ) ) ){
        out += str.charAt(i);
      }
    }
  }
  return out;
}
</script>

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<div>
			numberFormat():<br>

			<form method="get" onsubmit="javascript:return false;">
				<input type="text" onkeyup="javascript:document.getElementById('numFormatResult').innerHTML = numberFormat( this.value );">

				<input type="reset" value="clear">
			</form>
			<span id="numFormatResult"></span>
			<br><br>
			stripNonNumeric():<br>
			<form method="get" onsubmit="javascript:return false;">

				<input type="text" onkeyup="javascript:document.getElementById('numStripResult').innerHTML = stripNonNumeric( this.value );">
				<input type="reset" value="clear">

			</form>
			<span id="numStripResult"></span>
			<br><br>
			stripNonNumeric() then numberFormat():<br>
			<form method="get" onsubmit="javascript:return false;">
				<input type="text" onkeyup="javascript:document.getElementById('numBothResult').innerHTML = numberFormat( stripNonNumeric( this.value ) );">

				<input type="reset" value="clear">
			</form>

			<span id="numBothResult"></span>
		</div>

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13/01/2011
Justin Barlow [more]
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Simple JavaScript Number Formatter

1.7/5 15 votes / 8,580 previews / 0 comment 13/01/2011 This JavaScript code example provides us two functions to clean up and format numbers quite nicely. One ...Simple JavaScript Number Formatter - Simple JavaScript Number Formatter

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