1、做一个导航栏,并设置跳转链接的<a>标签的name属性或id
此处演示name标签
<!-- 导航条 -->
<nav id="navAjax" class="navbar navbar-expand-lg navbar-dark bg-dark" style="z-index:10;">
<a class="navbar-brand">学生管理系统</a>
<button class="navbar-toggler" type="button" data-toggle="collapse"
data-target="#navbarSupportedContent"
aria-controls="navbarSupportedContent" aria-expanded="false"
aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse " id="navbarSupportedContent">
<ul class="navbar navbar-nav mr-auto container">
<li class="nav-item active"><a class="nav-link" name="">主页
<span class="sr-only">(current)</span>
</a></li>
<li class="nav-item"><a class="nav-link" href="#">基本信息</a></li>
<li class="nav-item dropdown"><a
class="nav-link dropdown-toggle" href="#" id="navbarDropdown"
role="button" data-toggle="dropdown" aria-haspopup="true"
aria-expanded="false"> 系统查询 </a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">基本信息</a> <a class="dropdown-item"
href="#">成绩信息</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">汇总信息</a>
</div></li>
<li class="nav-item" ><a name="changePassword.jsp" class="nav-link">修改密码</a></li>
<li class="nav-item col-6"></li>
<!-- session -->
<li class="nav-item mf-auto" >
<a id="loginSession" name="login.jsp" class="nav-link" tabindex="1" href="./login.jsp">登陆</a></li>
<li><a id="register" name="register.jsp" class="nav-link" >注册</a></li>
<!-- <script>userName("${session_user.name}");</script> -->
</ul>
</div>
</nav>
2、创建iframe标签,并设置具体属性
iframe各属性值参考如下链接:https://www.w3school.com.cn/tags/tag_iframe.asp
<iframe src="" height="720px" width="100%" name="demo" frameborder="0" scrolling="no"
sandbox="allow-same-origin allow-top-navigation allow-forms allow-scripts">
</iframe>
3、使用jq对每个窗体的事件进行绑定
$(document).ready(function(){
//设置并获取Session
localStorage.setItem("session_name", "${session_user.name}");
var name = localStorage.getItem("session_name");
// 判空
if(name == null || name == "" || name.length == 0){
// 设置成未登录状态
$("#loginSession").text("登录");
$("#register").text("注册");
$("#register").attr("name","register.jsp");
$("#register").attr("href","register.jsp");
$("#register").attr("target","_top");
}else{
// 登录成功
$("#loginSession").text(name);
$("#loginSession").attr("name","");// 取消点击事件
$("#register").text("退出");
$("#register").attr("name","LogoutServlet");
}
// 导航栏点击,下面jframe的src改变,实现页面刷新功能
$("a").click(function(){
var src = $(this).attr("name");
$("iframe").attr("src",src);
});
});
4、对特殊的<a>标签进行处理
这里是防止退出登录后重新登录产生两个导航栏,具体情况根据个人项目自行编写
// 对退出按钮绑定事件,只要点击该按钮,就恢复成注册按钮
$("#register").click(function(){
var name = $(this).attr("name");
if(name == "LogoutServlet"){
$("#loginSession").text("登录");
$("#register").text("注册");
$("#register").attr("name","register.jsp");
$("#register").attr("href","LogoutServlet");
$("#register").attr("target","_top");
}
});
5、注意事项
iframe出现两个导航栏时,设置对应<a>标签的target值解决,如上面代码中设置target值为"_top"。若部分<a>标签不跳转则可不设置标签的name属性或id也可以让name属性为空或id为空。
若要测试这些代码,得导入bootstrap4得css和js包。