仅允许数字和特殊字符，不允许字母 [英] Allow Numbers and Special Characters only not alphabets

问题描述

我有一个文本框，我只想限制字母，即只接受数字和特殊字符，不接受字母..

i have a textbox, in that i want to restrict the alphabets only, that is it will accept only numbers and special charcaters not alphabets..

我尝试了以下Java脚本，但无法正常工作....

i had tried the below java script ,but it will not working ....

<script type="text/javascript">
    //Function to allow only numbers to textbox
    function validate(key) {
        //getting key code of pressed key
        var keycode = (key.which) ? key.which : key.keyCode;        
        //comparing pressed keycodes

        if (keyCode >= 65 && keyCode <= 90) {
            return false;
        }       
    } 
    </script>

和在文本框中

 <asp:TextBox ID="txt1" runat="server" OnTextChanged="txtoldpwd_TextChanged"
                            onkeypress="return validate(event)"></asp:TextBox>

推荐答案

将脚本编写为

<script type="text/javascript">
    function Validate(event) {
        var regex = new RegExp("^[0-9-!@#$%*?]");
        var key = String.fromCharCode(event.charCode ? event.which : event.charCode);
        if (!regex.test(key)) {
            event.preventDefault();
            return false;
        }
    }       
</script>

并像

<asp:TextBox ID="txtcheck" onkeypress="return Validate(event);" runat="server" />

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