页面刷新后，Node.js重新运行页面（并生成新数据）

Question

I have a web page running in Node.js (I an using ejs to render pages using the default folder setup provided by WebStorm ). Currently I run node bin/www which contains the following:

***preamble***
var app = require('../app');
var debug = require('debug')('tennis-geek:server');
var http = require('http');
var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);
var server = http.createServer(app);
***rest of code***

This then runs the app.js file which contains the following:

...
var predictions =  require("./routes/predictions");
app.use("/predictions", predictions);
...

This is where the issue lies . In the javascript file for this page ( routes/predictions.js ) I want to display information collected from two remote sources ( www.source_json.com and www.source_csv.com ).(As there are only two sources I have decided to do the web requests synchronously). This is private information which I don't want the end user to be able to access, so I thought it would be best to process and merge these data server side and then any final data I want the user to be able to see is saved into a javascript object called data_array and is sent to the corresponding ejs page ( views/predictions.ejs ) via:

var express = require('express');
var router = express.Router();
var recline = ("reclinejs");
var papa = require("papaparse");
var request = require('sync-request');

    //Now I collect the Data.

var res = request('GET', 'www.source_json.com');
var data_1_json = JSON.parse(res.getBody('utf8'));
res = request('GET', 'www.source_csv.com');
var data_2_json = papa.parse(res.getBody('utf8'), {header: true, skipEmptyLines: true}).data;

    //Now I do some private number crunching on the data

var data_array = private_number_crunching(data_1_json, data_2_json);

    //Now I send make this information available to the user's browser

router.get('/', function (req, res, next) {
    res.render('predictions', {title: 'Predictions', data_from_js: data_array});
});
module.exports = router;

The data collected from the two remote sources changes about every 20 mins. However, when I refresh the page the data isn't recollected from the two data sources (I have verified this using some timestamps). How can I ask Node.js to return freshly sourced data each time the page is requested? Is there an update button I can create on the page, or some javascript I can add? Currently the only way I can refresh the info is to restart the server ( CTRL + C + node bin/www ).

So far I have tried using setInterval loops, while loops, adding <% setTimeout('window.location.reload();', 20000); %> <% setTimeout('window.location.reload();', 20000); %> . Additionally I have considered using nodemon to watch some pseudo file which could contain a time when the data sources last changed the information and then restart the server if it does change, but I would like to avoid this.

Additionally I have looked at "similar" topics:

• How do I force a page to refresh the data upon reload after entering new record
• node.js get new data without refresh

Answer 1

Check if this works:

var express = require('express');
var router = express.Router();
var recline = ("reclinejs");
var papa = require("papaparse");
var request = require('sync-request');

//Now I collect the Data.



//Now I send make this information available to the user's browser

router.get('/', function (req, res, next) {
    var response1 = request('GET', 'www.source_json.com');
    var data_1_json = JSON.parse(response1.getBody('utf8'));
    var response2 = request('GET', 'www.source_csv.com');
    var data_2_json = papa.parse(response2.getBody('utf8'), {header: true,     skipEmptyLines: true}).data;

   //Now I do some private number crunching on the data

   var data_array = private_number_crunching(data_1_json, data_2_json);
   res.render('predictions', {title: 'Predictions', data_from_js: data_array});
   });
   module.exports = router;