JSFiddle - React, Tailwind, and code Playground

HTML

<img src="http://i.imgur.com/KV5tpQS.jpg" id="image_map">

JavaScript

$(document).ready(function(e) {
    $('#image_map').click(function(e) {
        var posX = $(this).position().left,posY = $(this).position().top;
        alert( (e.pageX - posX) + ' , ' + (e.pageY - posY));
    });
});