从express 4中的路由/索引设置模板变量

Setting template variables from routes/index in express 4

本文关键字:设置 索引 变量 路由 express      更新时间:2023-09-26

我是node.js和express的新手。我从终端使用"express myAppName"命令安装了express 4,它创建了一个默认目录,默认情况下我使用的是Jade模板。

主文件app.js如下(标准express样板文件):

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var routes = require('./routes/index');
var users = require('./routes/users');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
// uncomment after placing your favicon in /public
//app.use(favicon(__dirname + '/public/favicon.ico'));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', routes);
app.use('/users', users);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
});
// error handlers
// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
    app.use(function(err, req, res, next) {
        res.status(err.status || 500);
        res.render('error', {
            message: err.message,
            error: err
        });
    });
}
// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
        message: err.message,
        error: {}
    });
});
// Here is my local variable assignment:
app.locals.myVariable = "Hello this is a variable";
module.exports = app;

我从/routes/index.js:调用我的翡翠模板

var express = require('express');
var router = express.Router();
/* GET home page. */
router.get('/', function(req, res) {
  res.render('index', { title: 'Express' });
});
/* GET home page. */
router.get('/help', function(req, res) {
  res.render('index', { title: 'Help me' });
});
module.exports = router;

我的翡翠模板在myVariable中呈现值没有问题:

extends layout
block content
  h1= title
  p Welcome to #{title}
  p #{myVariable}

不过,我也希望能够从routes/index.js设置局部变量。我试过这样做:

var app = require('../app'); 
app.locals.myVariable = "This is my variable";

这应该是导入app.js,因为module.exports=app;正确的但是,我得到了TypeError: Cannot set property 'myVariable' of undefined

我的其他尝试:

router.locals.myVariable = 'This is my variable';

看起来路由器做了很多应用程序做的事情,但这会产生同样的错误。

router.set('myVariable', 'This is my variable');

我得到:TypeError: Object function router(req, res, next) { router.handle(req, res, next); } has no method 'set'

对我来说,从routes/index.js设置app.locals(或类似的东西)的最佳方式是什么?

您可以尝试将您的应用程序传递到init()或setup()中。此外,将所有路由声明封装到该设置中。

即路线/index.js:

// top
var app;
// later
module.exports.setup = function (appParam) {
     app = appParam;
    router.get('/', function(req, res) {
        app.locals.foo = 'bar';
        res.render('index', {baz: 'puf'});
    });
};

调用路由。setup(应用程序)设置该路由。