如下代码 提交表单 点了报错 对话框 就进入下个接收页面了
如何让他 保持在原页面？
<form id="form1" name="form1" method="post" action="Untitled-1.html">
<input type = "checkbox" id="checkbox" onclick="on_hide();"/>
<input type = "text" id="name" style="display:none;" />
<input type = "text" id="pass" style="display:none;" />
<input type = "submit" id="up" value = "提交表单" onclick="on_up();"/>
<script>
function on_hide(){
document.getElementById("name").style.display = document.getElementById("pass").style.display  = (document.getElementById("checkbox").checked == true) ? "block" : "none";
}
function on_up(){
var chebox = (document.getElementById("checkbox").checked == true) ? "block" : "none";
if(chebox=="block"){
 if(document.getElementById("name").value==""){
    alert("框1没有输入数据");}else if(document.getElementById("pass").value==""){
    alert("框2没有输入数据");}else {alert("框1的内容:"+ document.getElementById ("name").value+"<tr>"+"框2的内容:"+document.getElementById("pass").value);}
    }
}
</script>
</form>

dzt0001  看到你太高兴了！
我不懂 jsp  如您所说的
document.form1.submit();
这个代码加在如下什么地方呢？
<form id="form1" name="form1" method="post" action="Untitled-1.html">
<input type = "checkbox" id="checkbox" onclick="on_hide();"/>
<input type = "text" id="name" style="display:none;" />
<input type = "text" id="pass" style="display:none;" />
<input type = "button" id="up" value = "提交表单" onclick="on_up();"/>
<script>
function on_hide(){
document.getElementById("name").style.display = document.getElementById("pass").style.display  = (document.getElementById("checkbox").checked == true) ? "block" : "none";
}
function on_up(){
var chebox = (document.getElementById("checkbox").checked == true) ? "block" : "none";
if(chebox=="block"){
if(document.getElementById("name").value==""){
    alert("框1没有输入数据");}else if(document.getElementById("pass").value==""){
    alert("框2没有输入数据");}else {alert("框1的内容:"+ document.getElementById ("name").value+"<tr>"+"框2的内容:"+document.getElementById("pass").value);}
    }
}
</script>
</form>

搞定了，自己凭感觉瞎整 居然对了
还是谢谢你 dzt0001 ！

<form id="form1" name="form1" method="post" action="Untitled-2.html">
<input type = "checkbox" id="checkbox" onClick="on_hide();"/>
<input type = "text" id="name" style="display:none;"  />
<input type = "text" id="pass" style="display:none;" />
<input type = "button" id="up" value = "提交表单" onClick="on_up();"/>
<script>
function on_hide(){
document.getElementById("name").style.display = document.getElementById("pass").style.display  = (document.getElementById("checkbox").checked == true) ? "block" : "none";
}
function on_up()
{
var chebox = (document.getElementById("checkbox").checked == true) ? "block" : "none";
if(chebox=="block"){
if(document.getElementById("name").value==""){alert("框1没有输入数据");}
else
if(document.getElementById("pass").value==""){alert("框2没有输入数据");}
else
document.form1.submit();
}
}
</script>
</form>