Restrict user from entering special characters in textbox using javascript

rakibxl

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User: rakibxl
Posted: on Apr 01, 2016 05:56 AM
Forum: JavaScript
Answer: 1
Views: 5729
Sample Code: Download

i want to exclude @#% += special character but it is not working although i have supplied right asci code

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <style type="text/css">
        body
        {
            font-size: 9pt;
            font-family: Arial;
        }
    </style>
</head>
<body>
    Alphanumeric value:
    <input type="text" onkeypress="return IsAlphaNumeric(event);" id="text1" />
    <b id="error" style="display:none; color:red">Invalid</b>
    <script type="text/javascript">
        var specialKeys = new Array();
        specialKeys.push(8); //Backspace
        specialKeys.push(9); //Tab
        specialKeys.push(46); //Delete
        specialKeys.push(36); //Home
        specialKeys.push(35);
      specialKeys.push(43); 
      specialKeys.push(45);	
       
        function IsAlphaNumeric(e) {
            var keyCode = e.keyCode == 0 ? e.charCode : e.keyCode;
            var ret = ((keyCode >= 48 && keyCode <= 57) || (keyCode >= 65 && keyCode <= 90) || (keyCode >= 97 && keyCode <= 122) || (specialKeys.indexOf(e.keyCode) != -1 && e.charCode != e.keyCode));
            document.getElementById("error").style.display = ret ? "none" : "inline";
            return ret;
        }
    </script>
</body>
</html>

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dharmend...

0 6

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User: dharmendr
Replied: on Apr 05, 2016 06:04 AM
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You want disallow only @#%+= character and allow all other character.

rakibxl

0 7

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User: rakibxl
Replied: on Apr 05, 2016 09:18 PM
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how to change this function so that if we push that character asci value in the array that character will be invalid but other all special character will be all right i mean accepted

  function IsAlphaNumeric(e) {
            var keyCode = e.keyCode == 0 ? e.charCode : e.keyCode;
            var ret = ((keyCode >= 48 && keyCode <= 57) || (keyCode >= 65 && keyCode <= 90) || (keyCode >= 97 && keyCode <= 122) || (specialKeys.indexOf(e.keyCode) != -1 && e.charCode != e.keyCode));
            document.getElementById("error").style.display = ret ? "none" : "inline";
            return ret;
        }

rakibxl

0 8

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User: rakibxl
Replied: on Apr 05, 2016 09:23 PM
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how to change the function so that if we keep the asci value in the array i mean push so that which specific character will be disallow and other specific character will be accepted

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Restrict user from entering special characters in textbox using javascript

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