问题描述
在一个 express 应用程序中,我使用了一个在 app.js
中声明的 express 路由器:
In an express application, i'm using an express router declared in the app.js
as:
var adminRouter = require('./admin');
app.use("/admin", adminRouter);
所以它引用了 admin.js
文件,我在其中定义了这个特定的路由:
so it references the admin.js
file in which i defined this specific route :
router.route('/rooms/edit/:id')
.all(function(req, res, next) {
var roomid = req.params.id;
var room = _.find(rooms, r => r.id == roomid);
if (!room) {
res.sendStatus(404);
return;
}
res.locals.room = room;
next();
}).get(function(req, res) {
res.render('edit', { room: room });
}).post(function(req, res) {
res.locals.room.name = req.body.name;
res.redirect('./');
});
但是在用于编辑房间名称的视图中(通过上述路由中的 .get 方法访问),我收到此错误,指出我存储在 res.localsroom
变量/code> 未定义:
but in the view for editing the room name (accessed by the .get method in the route above) i get this error saying that the room
variable i stored in res.locals
isn't defined :
ReferenceError: room is not defined
这里是整个 app.js
var express = require('express');
var app = express();
var bodyParser = require('body-parser');
app.set("views", "./views");
app.set("view engine", "jade");
app.use(express.static("public"));
app.use(bodyParser.urlencoded({extended:true}));
app.use(function(req, res, next){
console.log('incomming req : ' + req.url);
next();
});
app.get('/', function(req, res){
res.render('index', {title:'Home'});
});
var adminRouter = require('./admin');
app.use("/admin", adminRouter);
app.listen(3000, function(){
console.log('app running on port 3000');
});
这也是 edit.jade 视图:
and this is the edit.jade view too :
extends layout
block content
h1 Edit chatroom!!
form(method="POST")
fieldset.form-group
label(for="name") Name:
input.form-control(name="name", type="text", placeholder="Enter a name" value="#{room.name}")
small.text-muted Give your chatroom a meaningful name for people to refer to it.
button.btn.btn-primary(type="submit") Save chatroom
a.btn.btn-default(href="/admin/rooms") Cancel
推荐答案
ReferenceError: room is not defined
那不是错误所说的:它说一个名为 room
的变量没有定义.它还应该将您指向发生错误的代码行,这里是:
That's not what the error says: it says that a variable called room
isn't defined. It should have also pointed you to the line of code where the error happens, which is here:
res.render('edit', { room: room });
事实上,room
是未定义的地方.
Where, in fact, room
is undefined.
这篇关于Express.js:存储在`res.locals`中的变量未在视图中定义的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!