我可以选择文本框中不允许的某些特殊字符吗？

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问题描述

我不想只允许像<这样的特殊字符。 >和&

我尝试过：

这里是我在互联网上搜索的代码，但此代码不接受所有特殊字符。

I don't want to allowed only the special character like < > and &

What I have tried:

and here's the code that i search on the internet but this code did not accept all of the special character.

<pre><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" id="text1" onkeypress="return IsAlphaNumeric(event);" ondrop="return false;"

         />
    <span id="error" style="color: Red; display: none">* Special Characters not allowed</span>
    <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); //End
        specialKeys.push(37); //Left
        specialKeys.push(39); //Right
        function IsAlphaNumeric(e) {
            var keyCode = e.keyCode == 1 ? 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>

推荐答案

function IsAlphaNumeric(e) {
        var keyCode = e.keyCode == 1 ? e.charCode : e.keyCode;
        var ret = ((keyCode > 31 && keyCode < 127) && keyCode != 38 && keyCode != 60 && keyCode != 62);
            document.getElementById("error").style.display = ret ? "none" : "inline";
            return ret;
}

它允许使用的任何字符[]从32到126除了<和>和&

你可以轻松添加或排除他人。

另外，只需添加：do不依赖JavaScript（客户端）验证用户输入。您必须始终在服务器上的代码（VB，C＃，等等）中运行相同的检查。

It will allow any character with ASCII code[^] from 32 to 126 apart from < and > and &

YOu can easily add or exclude others.

Also, just to add: do not rely on JavaScript (client side) validation for user input. You must always run the same checks in code (VB, C#, whatever) on the server as well.

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