express connect-flash displays only after refresh not on the samepage.how解决这个问题？

Question

below is register route

 router.post("/register", function(req, res){
var newUser=    new User({username:req.body.username});
   User.register(newUser,req.body.password, function(error,user){
       if(error){
          req.flash("error", error.message);
            return res.render("register.ejs");
       }else{
           passport.authenticate("local")(req, res ,function(){
                req.flash("success","Welcome to PhotoDiary, " + user.username);
               res.redirect("/diary");
           });
       }
   });
});

below is passport-local

app.use(function(req, res, next){
res.locals.currentUser = req.user;
res.locals.error = req.flash("error");
res.locals.success = req.flash("success");
next();

i put flash-connect in register route req.flash("error", error.message); when i sign up it shows the message after another refresh,not on the same page

Answer 1

使用 res.locals 将错误发送到视图不是一个好习惯，假设您正在使用 EJS 或 Pug 您也可以将消息和其他数据发送到视图文件这样。

router.post("/register", function(req, res){
var newUser=    new User({username:req.body.username});
User.register(newUser,req.body.password, function(error,user){
       if(error){
           req.flash("error", "An Error Has Occured");
           var data = {
              page_title : 'Register', // Set Page Title Dynamically
              message : req.flash('error'), // Set Message
           };
            return res.render("register.ejs" , data);
       }else{
           passport.authenticate("local")(req, res ,function(){
           req.flash("success","Welcome to PhotoDiary");
           var data = {
              page_title : 'Register', // Set Page Title Dynamically
              username : user.username,
              message : req.flash('success'), // Set Message
           };
              res.redirect("/diary", data);
           });
       }
   });
});

您将可以使用变量以这种方式访问视图文件中的数据（EJS 示例）

<Head>
   <title><%= page_title %></title>
</head>

<div class="alert alert-success">
      <%= message %> <%= username %> 
</div>

<h1> Welcome </h1>

express connect-flash displays only after refresh not on the samepage.how解决这个问题？

Express connect-flash displays only after refresh not on the same page.how to solve this?

javascript

node.js

mongodb

express

connect-flash