<script type="text/javascript">
function check(){
var x=document.getElementsByName("username").value;
if(x==null || x==""){
alert("Please input username");
return false;
}
}
</script>
</head>
<body>
<form action="js.php" method="POST" onsubmit="return check()">
<input type="text" name="username"></input>
<input type="submit" name="sub"></input>
</form>
</body>
这样就可以了
var x = document.getElementsByName("username")[0].value;
var x=document.getElementsByName("username");//x结果是数组
for(i=0;i<x.length;i++){
if(x[i].value==null || x[i].value==""){
alert("Please input username");
return false;
}
}
}
{
document.getElementById("action").value = "SET";
document.Form.submit();
}
function check()
{
var x=document.getElementsByName("name").value;
var y=document.getElementsByName("ip").value;
if(x==null || x=="" || y=="" || y==null)
{
alert("Please input information");
return false;
}
} <form action="js.php" method="POST" onsubmit="return check()">
<input type="text" name="username"></input>
<input type="submit" name="sub"></input><tr>
<td colspan=7 align="right"><input type="button" class="btn" name="Submit" value="确定" onclick="CheckSubmit()"></td>
</tr>
</form> 谢谢楼上,现在代码是这样的,但是检测name和ip非空的功能还是没用,我空着提交照样ok。。
var y=document.getElementsByName("ip")[0].value;
1.把button的type改为submit,不要显示调用form.submit()
2.显示调用form.submit(),在提交前验证form
<script type="text/javascript">
function CheckSubmit()
{
document.getElementById("sessionID").value = window.parent.sessionID.value;
document.getElementById("action").value = "SET";
document.Form.submit();
}function CheckInput()
{
var ctrname = document.getElementsByName("optctr_name")[0].value;
var ctrip = document.getElememntsByName("optctr_ip")[0].value;
if ( ctrname == "" || ctrname == null || ctrip == null || ctrip == "" )
{
alert("complete the information");
return false;
}
}</script>
<body><form action="/cgi-bin/optctrmod.cgi" method="get" name="Form" onsubmit="return CheckInput()">
<input type="hidden" name="sessionID">
<input type="hidden" name="action"><table width="80%" class="field" border="0" cellspacing="1" cellpadding="4" align="center" >
<tbody>
<tr>
<td class="bar" width="10%">名称</td>
<td class="bar" width="15%">IP地址</td>
<td class="bar" width="15%">子网掩码</td>
</tr>
<tr><td width="10%">网络1</td>
<td width="15%">192.168.1.2</td>
<td width="15%"></td>
</tr></table><br><br><table width="80%" style="white-space:pre-wrap" class="field" border="0" cellspacing="1" cellpadding="4" align="center"><tr><td class="bar" colspan="7" align="right">
操作 <select name="optctr_modtype">
<option></option>
<option value="mod">修改</option>
<option value="del">删除</option>
</select>
</td></tr><tr>
<td width="20%" align="center"><b><font size="2" >名称</font></b></td>
<td width="80%" align="center"><input style="width:300px" type="text" name="optctr_name"></td></tr><tr><td width="20%" align="center"><b><font size="2" >IP地址</font></b></td>
<td width="80%" align="center"><input style="width:300px" type="text" name="optctr_ip"></td></tr><tr>
<td colspan=7 align="right"><input type="button" class="btn" name="Submit" value="确定" onclick="CheckSubmit()"></td>
</tr>
</tbody>
</table>
</p>
<br>
<br>
<br>
</form>
</body>
</html>整个代码
谢谢,在提交前验证,是不是在checksubmit函数里的 form.submit之前加判断语句?