popup.json

$(document).ready(function() {
    $("button").click(function() {
        var xhr = new XMLHttpRequest();
        var url = "http://localhost:8081/trigger_jenkins_job";
        var selectedCity = $('#city').val();
        xhr.open("POST", url, true);
        xhr.setRequestHeader("Content-Type", "application/json");
        xhr.onreadystatechange = function() {
            if (xhr.readyState === 4 && xhr.status === 200) {
                var json = JSON.parse(xhr.responseText);
            }
        };
        var data = JSON.stringify({
            "city_name": selectedCity
        });
        xhr.send(data);
    });
});