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How to do currency validation that also allowed to put negative at infront.

Hi,

For the below Java sctipt, How can I modify it so that my input will allowed me to put the negative sign "-" at the begining?

<html>
<head>
      <title>Test Page</title>

      <script language="JavaScript">
     
      function main()
      {
            document.getElementById("price").focus();
      }

      function parseCurrency(field)
      {
            var currency = /^\d*(?:\.\d{0,2})?$/;
            var onlyCurrency = /^(\d*(?:\.\d{0,2})?)[\s\S]*$/;
           
            if(!currency.test(field.value))
            {
                  field.value = field.value.replace(onlyCurrency, "$1");
            }
      }
     
      </script>
</head>

<body onload="javascript:main();">

      $ <input type="text" id="price" name="price" onKeyUp="javascript:parseCurrency(this);" onChange="javascript:parseCurrency(this);">

</body>
</html>
0
runbird
Asked:
runbird
1 Solution
 
Lolly-InkCommented:
Add the minus sign to the 2 regular expressions:
<html>
<head>
      <title>Test Page</title>
 
      <script language="JavaScript">
      
      function main()
      {
            document.getElementById("price").focus();
      }
 
      function parseCurrency(field)
      {
            var currency = /^\-?\d*(?:\.\d{0,2})?$/;
            var onlyCurrency = /^(\-?\d*(?:\.\d{0,2})?)[\s\S]*$/;
            
            if(!currency.test(field.value))
            {
                  field.value = field.value.replace(onlyCurrency, "$1");
            }
      }
      
      </script>
</head>
 
<body onload="javascript:main();">
 
      $ <input type="text" id="price" name="price" onKeyUp="javascript:parseCurrency(this);" onChange="javascript:parseCurrency(this);">
 
</body>
</html>

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