我在尝试查询使用 MongoDB(使用 Mongoose 作为 ODM)构建的数据库并将结果显示在页面上时遇到了困难。数据库将数据(包括日期:“date”和链接:“www.example.com”)存储在我命名为“entries”的集合中。我想使用两个 View 来访问数据库:一个 View 将利用日期键来显示特定日期的正确链接；另一个 View 将使用日期键来显示特定日期的正确链接。以及数据库 View ，我可以在其中查看、添加和删除条目。我能够以某种方式循环遍历数据库 View 的条目并将它们添加到 DOM，但是当我对小部件 View 尝试相同的操作时，我似乎无法从条目集合中访问 JSON 对象。我使用 Jade 作为 HTML 的预处理器
我的 app.js 文件如下:
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 router = express.Router();
//database stuff
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
//connect to the data store and the set up the database
var db = mongoose.connection;
//connect to the database
var conn = mongoose.connect('mongodb://localhost/Mandela_Diaries/data');
//Create a model which connects to the schema and entries collection in the Mandela_Diaries database
var Entry = mongoose.model("Entry", new Schema({date: 'date', link: 'string'}), "entries");
mongoose.connection.on("open", function() {
console.log("mongodb is connected!");
});
var routes = require('./models/index');
var users = require('./routes/users');
var database = require('./routes/database');
var methodOverride = require('method-override');
var templatemain = require('./routes/template-main');
var app = express();
// Methodoverride at the top
app.use(methodOverride('_method'));
// 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());
//serving static files
app.use('/public', express.static(__dirname + '/public'));
app.use('/public', express.static(__dirname + '/css'));
app.use('/public', express.static(__dirname + '/js'));
app.use('/public', express.static(__dirname + '/images'));
app.use('/public', express.static(__dirname + '/node_modules'));
app.use('/', routes);
app.use('/', routes);
app.use('/', routes);
app.use('/database', database);
app.use('/create', database);
app.use('/delete', database);
app.use('/:id', database);
// app.use('/database/#{entry._id}?/delete', database);
// 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: {}
});
});
module.exports = app;
module.exports.Entry = Entry;
app.listen(8080);
console.log("The server has started");
我的database.js路由器代码如下:
var express = require('express');
var router = express.Router();
var mongoose = require('mongoose');
var Entry = mongoose.model('Entry');
//The route for getting data for the database - GET form
router.get("/", function(req, res) {
//Send the current entries to the page
Entry.find({}, function(err, entries) {
console.log(entries);
if(err) {
res.status(404).json({"error": "not found", "err":err});
return;
} else {
res.render('database', {title: 'database', entries: entries});
//console.log(entries);
//entries.forEach(printjson);
}
});
});
//The route for posting data to the database - POST
router.post('/', function(req, res) {
var newEntry = new Entry(req.body);
newEntry.save(function(err, entries){
if (err !== null) {
res.status(500).json(err);
} else {
res.redirect('database');
};
});
});
//The route for deleting data to the database - Delete/remove todo item by its id
// Changed path from `/` to `/:id`
router.delete('/:id', function (req, res) {
Entry.findById(req.params.id)
.exec(function(err, entries) {
// changed `if (err || !doc)` to `if (err || !entries)`
if (err || !entries) {
res.statusCode = 404;
res.send({});
} else {
entries.remove(function(err) {
if (err) {
res.statusCode = 403;
res.send(err);
} else {
res.send('Deleted entry with link: ', entries.link);
}
});
}
});
});
module.exports = router;
我的index.js路由器代码如下:
var express = require('express');
var router = express.Router();
var mongoose = require('mongoose');
var Entry = mongoose.model('Entry');
var moment = require('moment');
/* GET home page. */
router.get('/', function(req, res, next) {
res.render('/', { title: 'Express' });
Entry.find({}, function(err, entries) {
if(err) {
res.status(404).json({"error": "not found", "err":err});
return;
} else {
res.render('/', {title: 'database', entries: entries});
}
});
});
console.log("new code works");
module.exports = router;
我的 script.js 代码运行 jQuery 以根据日期附加正确的视频链接，如下所示:
$(document).ready(function() {
//Date picker jQuery
$(function() {
$( ".datepicker" ).datepicker();
$( "#format" ).change(function() {
$( ".datepicker" ).datepicker( "option", "dateFormat", $( this ).val() );
});
});
var browserDate = new Date();
var videoDate = new Date(1962);
//var month = browserDate.getMonth() + 1;
//var day = browserDate.getDate();
//var year = browserDate.getFullYear();
var context = browserDate - videoDate;
$('#context').innerHTML = "ON THIS DAY " + context + " YEARS AGO:";
console.log("ON THIS DAY " + context + " YEARS AGO:");
console.log("This worked!!");
console.log(browserDate);
});
我的index.jade Jade代码是这样的:
extends layout
block content
#widget.container
.row
#header.col-xs-12.header
img#Mandela_Logo(src='/public/images/Logo_MandelaDiaries.png')
.row
#context.col-xs-12
.row
#videos.col-xs-12
.embed-responsive.embed-responsive-4by3
iframe(width='300', height='169', src='https://www.youtube.com/embed/4HqtAMHrJ8s', frameborder='0', allowfullscreen='')
.row
#footer.col-xs-12
img#NMF_logo(src='/public/images/Logo_NMF.png')
img#SABC_logo(src='/public/images/Logo_SABCNews.png')
我似乎无法让我的 jQuery 在这里工作。我只想获取 JSON 对象并循环遍历它并根据浏览器日期找到相关日期，并将相应的链接附加到我的小部件中的 iframe。
最佳答案
为了简化事情，您可以使用 momentjs 非常擅长处理日期的库。在您的用例中，您想要使用 fromNow() 方法，显示从现在开始的相对时间，例如
moment([2011, 0, 29]).fromNow(); // 4 years ago
moment("1962-04-08T09:48:16.189Z").fromNow() // 53 years ago
要在 View 中使用 momentjs 库，您需要将其添加到您的 Express 应用程序局部变量中，如下所示:
express = require('express');
...
var app = express();
app.locals.moment = require('moment');
由于您可以在 Jade View 中使用纯 JavaScript 代码，因此您可以轻松执行以下操作:
extends layout
block content
#widget.container
.row
#header.col-xs-12.header
img#Mandela_Logo(src='/public/images/Logo_MandelaDiaries.png')
.row
#context.col-xs-12
each entry in entries
p= 'ON THIS DAY ' + moment(entry.date).fromNow() + ' - Link: ' + entry.link + ' '
.row
#videos.col-xs-12
.embed-responsive.embed-responsive-4by3
iframe(width='300', height='169', src='https://www.youtube.com/embed/4HqtAMHrJ8s', frameborder='0', allowfullscreen='')
.row
#footer.col-xs-12
img#NMF_logo(src='/public/images/Logo_NMF.png')
img#SABC_logo(src='/public/images/Logo_SABCNews.png')
<强> Demo
来源:Making use of utility libraries in server-side Jade templates
关于javascript - 使用 NodeJS 和 jQuery 查询 MongDB 数据库，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31113854/