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Node.js - Routing ajax requests with Express.JS
Start
  A simple implementation of AJAX

You should have the basic express-generator template

In app.js, add(you can add it anywhere after var app = express.app()):

app.post(function(req, res, next){
    next();
});

Now in your index.js file (or its respective match), add:

router.get('/ajax', function(req, res){
    res.render('ajax', {title: 'An Ajax Example', quote: "AJAX is great!"});
});
router.post('/ajax', function(req, res){
    res.render('ajax', {title: 'An Ajax Example', quote: req.body.quote});
});

Create an ajax.jade / ajax.pug or ajax.ejs file in /views directory, add:

For Jade/PugJS:

extends layout
script(src="http://code.jquery.com/jquery-3.1.0.min.js")
script(src="/magic.js")
h1 Quote: !{quote}
form(method="post" id="changeQuote")
    input(type='text', placeholder='Set quote of the day', name='quote')
    input(type="submit", value="Save")

For EJS:

<script src="http://code.jquery.com/jquery-3.1.0.min.js"></script>
<script src="/magic.js"></script>
<h1>Quote: <%=quote%> </h1>
<form method="post" id="changeQuote">
    <input type="text" placeholder="Set quote of the day" name="quote"/>
    <input type="submit" value="Save">
</form>

Now, create a file in /public called magic.js

$(document).ready(function(){
    $("form#changeQuote").on('submit', function(e){
        e.preventDefault();
        var data = $('input[name=quote]').val();
        $.ajax({
            type: 'post',
            url: '/ajax',
            data: data,
            dataType: 'text'
        })
        .done(function(data){
            $('h1').html(data.quote);
        });
    });
});

And there you have it! When you click Save the quote will change!

 

Read Article
https://develop.horje.com/learn/1434/reference

 

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