function checkDelForm() {
var uids = -1;
uids = document.getElementsByName("delUids").length;
if (uids == -1) {
alert("请选择要删除的用户");
return false;
} else {
return true;
}
}<form name="userform" action="servlet/DeleteUserServet" method="post"
onsubmit="return checkDelForm()">
<table align="center" border="1" width="440px">
<tr>
<td colspan="6" align="center">用户资料</td>
</tr>
<tr>
<td align="center">用户姓名</td>
<td align="center">用户性别</td>
<td align="center">出生日期</td>
<td align="center">用户住址</td>
<td colspan=2 align="center">操作</td>
</tr>
<%
while (rs.next()) {
%>
<tr>
<td><%=rs.getString("uname")%></td>
<td><%=rs.getString("usex")%></td>
<td><%=rs.getString("ubirth")%></td>
<td><%=rs.getString("uaddr")%></td>
<td><a
href="UserListDetail.jsp?uid=<%=rs.getInt("uid")%>&&uname=<%=rs.getString("uname")%>&&usex=<%=rs.getString
("usex")%>&&ubirth=<%=rs.getString("ubirth")%>&&uaddr=<%=rs.getString("uaddr")%>">编辑</a>
</td>
<td><input type="checkbox" name="delUids"
value="<%=rs.getInt("uid")%>"></td>
</tr>
<%
}
conn.close();
rs.close();
stmt.close();
%>
<tr>
<td colspan="6" align="center"><input type="submit" value="删除"
style="width: 82px; "> <font color="green"> ${msg} </font>
</td>
</tr>
</table>
</form>
8 回答
慕姐4208626
TA贡献1852条经验 获得超7个赞
你只是判断delUids有多少个。而且也判断错了，是==0，不是==-1，改成下面的
function checkDelForm() {
var cbs = document.getElementsByName("delUids"), len = cbs.length, ok = false;
for (var i = 0; i < len; i++)
if (cbs[i].checked) {
ok = true; break;
}
if (!ok) {
alert("请选择要删除的用户");
return false;
} else {
return true;
}
}
慕容3067478
TA贡献1773条经验 获得超3个赞
function checkDelForm() {
var uids = -1;
uids = document.getElementsByName("delUids");
len = uids.length;
var j = 0;
for(var i=0;i<len;i++){
if(uids[i].checked){
j++;
};
}
if (j == 0) {
alert("请选择要删除的用户");
return false;
} else {
return true;
}
}
脚本应该这么写，document.getElementsByName("delUids");返回的是所有name=delUids一个集合,要判断属性checked是否为true
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