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function check()
{
if(document.getElementById('<%=TextBoxname.ClientID%>').value=="")
{
alert('不能输入为空的内容!');
event.returnValue=false
}
}
function check()
{
if(document.getElementById('<%=TextBoxname.ClientID%>').value=="")
{
alert('不能输入为空的内容!');
///后台的ImageButton1_Click事件不激发,怎么写?
}
}
<asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/AdminLogin/images/user_botton.gif" OnClientClick="check()" OnClick="ImageButton1_Click" />
<html>
<head>
<title> new document </title>
<script language="javascript">
<!--
function func() {
var obj = document.getElementById('text1');
if(obj.value.length == 0) {
document.getElementById('label1').style.display = 'block';
return false;
}
}
//-->
</script>
</head>
<body>
<form method="post" action="http://www.baidu.com">
<input type="text" id="text1" name="text1" ><span id="label1" style="display:none; color:#ff0000;">Required Field</span>
<br>
<input type="submit" value="submit" onclick="return func();">
</form>
</body>
</html>