How to get click function on Node.js server using jQuery AJAX?

By using Ajax, I want to get a click function in a Jade client, which will then be passed to Express in Node.js. After that using Socket.Io, the server will emit a click request to be executed in another HTML client. I tried the following codes, but I got GET ... 404 (Not Found) on the Jade page. Can somebody help me to see which needs to be corrected?

Thank you.

Jade client code:

$(document).bind('pageinit', function() {
  $('#buttonA').click(function() {
    $.get('/buttonA');
    });
});

Server code:

app.get('/buttonA', function (req, res) {
    sockets.emit('clickA');
});

HTML client code:

socket.on('clickA', function (data) {
     document.getElementById('buttonB').click();
});

via Fanny Febriani Susilo