JSP中JS弹出未登录提示框并自动跳转 关于JSP跳转前弹出提示框的问题
Jsp\u6ce8\u518c\u540e\u5f39\u51fa\u63d0\u793a\u6846\uff0c\u662f\u5426\u8f6c\u5230\u767b\u5f55\u9875\u9762\uff1f\u6ce8\u518c\u6210\u529f\u540e\u8df3\u8f6c\u5230\u6b64\u9875\u9762\u5c31\u884c\uff1a
if(confirm("\u662f\u5426\u8df3\u8f6c\u5230\u6ce8\u518c\u9875\u9762")){
window.location = "login.jsp";
}
JSP\u8df3\u8f6c\u524d\u5f39\u51fa\u63d0\u793a\u6846\u7684\u95ee\u9898\u7684\u5b9e\u73b0\uff1a
\u65b9\u5f0f1\uff1a JSP\u524d\u7aef
alert("\u60a8\u8fd8\u6ca1\u6709\u767b\u5f55\uff0c\u8bf7\u767b\u5f55...");
window.document.location.href="userlogin.html";
\u65b9\u5f0f2\uff1a Java\u540e\u53f0
public void popAlert() {
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
out.print("alert('\u60a8\u8fd8\u6ca1\u6709\u767b\u5f55\uff0c\u8bf7\u767b\u5f55...'); window.location='userlogin.html' ");
out.flush();
out.close();
}
\u65b9\u5f0f3\uff1a Java\u540e\u53f0 + JSP\u524d\u7aef
1\uff09 Java\u540e\u53f0\u4ee3\u7801\u6bb5
public void popAlert() {
request.setAttribute("loginError", "\u60a8\u8fd8\u6ca1\u6709\u767b\u5f55\uff0c\u8bf7\u767b\u5f55..."); // \u8bbe\u7f6e\u9519\u8bef\u5c5e\u6027
request.getRequestDispatcher("userlogin.html").forward(request, response);
}
2\uff09 JSP\u524d\u7aef\u4ee3\u7801\u6bb5
<%
String errorInfo = (String)request.getAttribute("loginError"); // \u83b7\u53d6\u9519\u8bef\u5c5e\u6027
if(errorInfo != null) {
%>
alert(""); // \u5f39\u51fa\u9519\u8bef\u4fe1\u606f
window.location='userlogin.html' ; // \u8df3\u8f6c\u5230\u767b\u5f55\u754c\u9762
<%
}
%>
<%
String username = (String) session.getAttribute("sUser");
if(username!=null)//如果这个不等于空，那么证明已经登录
{
MessageBiz bmb = new MessageBizImpl();
List<Message> list = bmb.findMessages(username);
request.setAttribute("msgs", list);
}else
{
%>
<script type="text/javascript"> alert("请先登陆"); window.location="../login.jsp" </script>
<%
//如果session 为空那么证明没有登录将跳到login.jsp
}
%>
打印出<script type="text/javascript"> alert("请先登陆"); window.location="../login.jsp" </script>即可。不过还要注意用户禁用了js的情况。
直接在按钮点击的时候，加一个事件，在js代码中获取文本框的长度啊，如果长度为0就弹出对话框。
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