代码
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script language ="javascript" type="text/javascript" >
var numeric = /^[0-9]{1,8}$/; //验证数字的正则表达式，后面表示长度限制
function txtPrimeChange()
{
var key = event.keyCode;
var KEYENTER = 13;
//alert(key);
//var char=String.fromCharCode(key); //得到键盘输入的字符
if (key == KEYENTER) {
if (!numeric.test(document.all.txtPrime.value)) {
alert("请输入数字");
document.all.txtPrime.value = "";
}
else {
document.all.btnSubmit.click();
//document.all.txtPrime.focus();
}
document.all.txtPrime.focus();
}
}
//要使TXT的onkeydown事件生效，必须屏蔽FORM的KEYDOWN事件
function frmKeyDown() {
if (event.keyCode == 13)
return false;
}
function pageLoad() {
document.all.txtPrime.value = "";
document.all.txtPrime.focus();
}
function btnSubmitOnClient() {
if (!numeric.test(document.all.txtPrime.value)) {
alert("请输入数字");
document.all.txtPrime.value = "";
document.all.txtPrime.focus();
return false;
}
return true;
}
</script>
</head>
<body onload="javascript:pageLoad()">
<form id="form1" runat="server">
<div>
<asp:Panel ID="Panel1" runat="server" onkeydown="return frmKeyDown()">
<asp:Label ID="Label1" runat="server" Text="请输入一个数："></asp:Label>
<asp:TextBox ID="txtPrime" runat="server" onkeydown="txtPrimeChange()"></asp:TextBox>
<asp:Button ID="btnSubmit" runat="server" OnClick="btnSubmit_Click" OnClientClick="return btnSubmitOnClient();" Text="验证" />
<br />
<asp:Label ID="lblTestResult" runat="server"></asp:Label>
</asp:Panel>
</div>
</form>
</body>
</html>