javascript 只允许数字和特殊字符，不允许字母
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Allow Numbers and Special Characters only not alphabets
提问by Saravana
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..
我有一个文本框，因为我只想限制字母，也就是说它只接受数字和特殊字符而不是字母。
i had tried the below java script ,but it will not working ....
我试过下面的java脚本，但它不起作用......
<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>
and in the textbox
并在文本框中
<asp:TextBox ID="txt1" runat="server" OnTextChanged="txtoldpwd_TextChanged"
onkeypress="return validate(event)"></asp:TextBox>
回答by Abhishek Jaiswal
Write script as
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>
and call like
并打电话给
<asp:TextBox ID="txtcheck" onkeypress="return Validate(event);" runat="server" />
回答by waheed
$(function(){
$('input').keypress(function(e){
var txt = String.fromCharCode(e.which);
console.log(txt + ' : ' + e.which);
if(!txt.match(/[A-Za-z+#.]/))
{
return false;
}
});
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" />回答by Srinivas P
function AllowAlphabet(evt) {
var charCode = (evt.which) ? evt.which : event.keyCode;
if ((charCode > 64 && charCode < 91) || (charCode > 96 && charCode < 123))
return true;
else
return false;
}
回答by Nevin Chaushev
You can use regular expression validator. Here is
您可以使用正则表达式验证器。这是
<asp:TextBox ID="txt1" runat="server"></asp:TextBox>
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txt1"
ErrorMessage="Enter a valid number" ValidationExpression="^\d+$"></asp:RegularExpressionValidator>
Or if you want to use JavaScript:
或者，如果您想使用 JavaScript：
Try this example: http://www.codeproject.com/Tips/328178/Allow-only-Numeric-values-in-ASP-Text-box-control
试试这个例子：http: //www.codeproject.com/Tips/328178/Allow-only-Numeric-values-in-ASP-Text-box-control
