Question

143

Calling method in Node js from browser (Using Express)

rated 0 times [ 146] [ 3] / answers: 1 / hits: 27309 / 9 Years ago, sat, february 14, 2015, 12:00:00

I defined these three routes in app.js

app.use('/', require('./routes/index'));

app.use('/LEDon', require('./routes/LEDon'));

app.use('/LEDoff', require('./routes/LEDoff'));

In my route file I have the following:

var express = require('express');

var router = express.Router();

var Gpio = require('onoff').Gpio,

    led = new Gpio(17, 'out');



router.get('/', function(req, res, next) {

  led.writeSync(1);

});



module.exports = router;

So when I go to the /LEDon page the method runs and everything works. Is it possible though to run a method without using a get request? My main goal is to just click a hyperlink which then runs the method..

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tayaw

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answered 9 Years ago iselauniquef · Accepted Answer

Essentially you are asking your client side script to directly call a function on your Node server script. The only other choice other than an Ajax POST AFAIK is Socket.io

This similar stackoverflow question should help you out.

edit: I made a simple example spanning multiple files:

/test/app.js:

var express = require('express');

var app = express();



app.post('/LEDon', function(req, res) {

    console.log('LEDon button pressed!');

    // Run your LED toggling code here

});



app.listen(1337);

/test/clientside.js

$('#ledon-button').click(function() {

    $.ajax({

        type: 'POST',

        url: 'http://localhost:1337/LEDon'

    });

});

/test/view.html

<!DOCTYPE html>

<head>

</head>



<body>

    <button id='ledon-button'>LED on</button>

    <script src=https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js></script>

    <script src='clientside.js'></script>

</body>

To run it: node app.js in terminal, and open view.html on your browser. Try pressing the button and check out your terminal. Hope this helps.