Node.js Retrieve URL Parameters from Server - node.js

Question

I need to pass a parameter (qItems) in XMLHttpRequest.open:
index.html (app.listen(8080);)
var qItems= 8;
var url= 'ItemsList';
var xhr = new XMLHttpRequest();
var tag = document.getElementById("insertHere");
tag.innerHTML = "Loading...";
xhr.open("GET", url+"?qItems="+qItems, true);
xhr.onreadystatechange = function() {
display(tag, xhr);
}
xhr.send(null);
But on Server side (server.js) use static URLs:
var express = require('express');
var bodyParser = require('body-parser');
var directory = require('serve-index');
var sqlite3 = require('sqlite3').verbose();
var app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.set('views', __dirname);
app.set('view engine', 'pug');
var db = new sqlite3.Database('./data/DB.sqlite',function(err){
if (err) {
console.log(err.message);
}
console.log('Connected to DB!');
});
app.get('/ItemsList', function(req, res) {
db.all("SELECT rowid, iName, iDescrip FROM Items", function(err, row) {
if (err !== null) {
res.status(500).send("An error has occurred: " + err);
} else {
res.render('ItemsList.pug', {
items: row
}, function(err, html) {
res.status(200).send(html)
});
}
});
});
I try (server.js):
app.get('/ItemsList?qItems='+qItems, function(req, res) {...}
But I get error: qItems undefined (from node.js)
Is there any way to get query parameters from Server side?

Answer 1

You don't need to implement a different handler for url with query params, ItemsList/qItems=xxx, query params are available to /ItemsLists GET handler in req.query.
app.get('/ItemsList', function(req, res) {
// You can access qItems from query params
var qItems = req.query.qItems
...
}