行 onclick="return Val();" 显示错误无法从函数或方法外部返回,并且在执行 JavaScript 函数后,表单将被提交,无论文本字段是否为空白。
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<html>
<%if(session.getAttribute("status")==null){
response.sendRedirect("atmHomeUser.jsp");
}
%>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<script>
function Val(){
document.getElementById("m1").innerHTML="";
document.getElementById("m2").innerHTML="";
if(document.forms[0].oldPin.value.length == 0 || isNaN(document.forms[0].oldPin.value)){
document.getElementById("m1").innerHTML="Enter Old pin which must be numbers only";
return false;
}
else if(document.forms[0].newPin.value.length == 0 || isNaN(document.forms[0].newPin.value)){
document.getElementById("m2").innerHTML="Enter New pin which must be numbers only";
return false;
}
else{
return true;
}
}
</script>
</head>
<body>
<table width="100%" height="100%">
<tr>
<td colspan="2"><%@include file="atmAdmin.jsp"%>
</td>
</tr>
<tr height="100%">
<td colspan="2" align="center">
<div style="">Enter old and new PIN</div>
<table style="font-family: verdana font-size : 38px" align="center">
<tr>
<td></td>
</tr>
<form action="ChangePIN" method="post">
<tr>
<td font-size="28px">Enter Old PIN No.</td>
<td><input type="name" name="oldPin">
</td><td><span id="m1" ></span>
</td>
</tr>
<tr>
<br>
<td></td>
</tr>
<td></td>
</tr>
<tr>
<td font-size="28px">Enter New Pin</td>
<td><input type="name" name="newPin">
</td><td><span id="m2" ></span>
</td>
</tr>
<tr>
<br>
<td></td>
<td align="center"><input type="submit" value="submit" onclick="return Val();">
</td>
</tr>
</form>
</table></td>
</tr>
<tr width="22px" valign="bottom">
<td colspan="2"><%@include file="atmFoot.jsp"%>
</td>
</tr>
</table>
</body>
</html>
请帮助我,因为我是新手。还告诉我如何将 javascript 代码转换为 jquery。