ajax.request.js

var cityDetails = $.ajax({  
    type: 'GET',
    url:  '/path/to/resource',
    beforeSend: function() {
        console.log('Before sending the Request');
    },
    success: function(result) {
        console.log(result);
        console.log('Response received.');
    },
    error: function() {
        console.log('Error occured.');
    }
});