I am new with this and I am using Intellij as my editor for a project with nodejs, mongodb, express and jade/pug viewing engine. I need to view my data in a graph and decided to use chart.js. I can already access and view my data in a table but I want to show it in a graph.
Can someone help me understand how to include the chart.js file in the project. I have already npm installed it and it shows in my terminal, but how do I access this in the project. I have tried different things like including it as you do in a browser file or passing the exact directory link but maybe I am not understanding this. Please help!
Thanks!
Here are the files I have, most of it is default, I have made very minor edits only to fetch and display the data from a remote mongodb, where and how should I include the chartjs stuff. I tried the CDN method but I think I am not placing the link in the right place:
app.js is as:
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
//New Code to connect remote Mongodb -Sg
var mongo = require('mongodb');
var monk = require('monk');
var db = monk('username:passwd@ipaddress:27017/default',
{authSource:'admin'});
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
// Make our db accessible to our router -Sg
app.use(function(req,res,next){
req.db = db;
next();
});
app.use('/', indexRouter);
app.use('/users', usersRouter);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
next(createError(404));
});
// error handler
app.use(function(err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
// render the error page
res.status(err.status || 500);
res.render('error');
});
module.exports = app;
index.js is as:
var express = require('express');
var router = express.Router();
/* GET home page. */
router.get('/', function(req, res, next) {
res.render('index', { title: 'Express' });
});
/* GET envlist page. */
router.get('/envlist', function(req, res) {
var db = req.db;
var collection = db.get('LORA_Sensor');
collection.find({},{},function(e,docs){
res.render('envlist', {
"envlist" : docs
});
});
});
module.exports = router;
envlist.pug file is as:
extends layout
block content
h1
Environment Parameter List
ul
p Co2
each envparam, i in envlist
li
p= envparam.Co2
new envlist.pug with just a graph using static data is below
extends layout
block content
canvas#myChart
script.
var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
type: 'line',
data: {
labels: ['M', 'T', 'W', 'T', 'F', 'S', 'S'],
datasets: [{
label: 'apples',
data: [12, 19, 3, 17, 6, 3, 7],
backgroundColor: "rgba(153,255,51,0.4)"
}, {
label: 'oranges',
data: [2, 29, 5, 5, 2, 3, 10],
backgroundColor: "rgba(255,153,0,0.4)"
}]
}
});
layout.pug:
doctype html
html
head
title= title
link(rel='stylesheet', href='/stylesheets/style.css')
script(src='https://cdnjs.com/libraries/Chart.js')
body
block content
