Get rid of jQuery dependency - use XHR and Promise

 common.js

@@ -8,7 +8,6 @@
};
var ttss_types = ['t', 'b'];

// Special directions
var special_directions = {
    'Zajezdnia Nowa Huta' : 'ZH',
    'Zajezdnia Podgórze' : 'ZP',
@@ -17,12 +16,77 @@
    'Przejazd techniczny' : 'PT',
};


/********
 * AJAX *
 ********/

function Deferred(promise, request) {
    return {
        promise: promise,
        request: request,
        abort: function() {
            request.abort.bind(request)
            return Deferred(promise, request);
        },
        done: function(func) {
            return Deferred(promise.then(func), request);
        },
        fail: function(func) {
            return Deferred(promise.catch(func), request);
        },
        always: function(func) {
            return Deferred(promise.finally(func), request);
        },
    };
}

Deferred.all = function(iterable) {
    return Deferred(
        Promise.all(
            iterable.map(x => x.promise)
        )
    );
};

var $ = {
    timeout: 10000,
    dataType: 'json',
    get: function(url) {
        var self = this;
        var request = new XMLHttpRequest();
        var promise = new Promise(function(resolve, reject) {
            request.timeout = self.timeout;
            request.onreadystatechange = function() {
                if(this.readyState == 4) {
                    if(this.status == 200) {
                        if(self.dataType == 'json') {
                            resolve(JSON.parse(this.responseText));
                        } else {
                            resolve(this.responseText);
                        }
                    } else {
                        reject(request);
                    }
                }
            };
            request.open("GET", url, true);
            request.send();
        });
        return Deferred(promise, request);
    },
};


/***********
 * VERSION *
 ***********/

var script_version;
var script_version_xhr;

var vehicles_info = {};

// Check for website updates
function checkVersion() {
    if(script_version_xhr) script_version_xhr.abort();
    
@@ -46,7 +110,11 @@
    setInterval(checkVersion, 3600000);
}

/* Parsing of received JSON parts */

/***********
 * PARSING *
 ***********/

function parseStatus(status) {
    switch(status.status) {
        case 'STOPPING':
@@ -91,7 +159,6 @@
    return lang.time_minutes_prefix + ((actual.getTime() - planned.getTime()) / 1000 / 60) + lang.time_minutes_suffix;
}

// Webservice-related functions
function parseVehicle(vehicleId) {
    if(!vehicleId) return false;
    if(!vehicles_info || !vehicles_info[vehicleId]) {
@@ -159,7 +226,11 @@
    return span;
}

// Element mangling

/*******
 * DOM *
 *******/

function deleteChildren(element) {
    while(element.lastChild) element.removeChild(element.lastChild);
}

 index.html

@@ -133,9 +133,9 @@
                </div>
            </div>
        </div>
        <script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha384-tsQFqpEReu7ZLhBV2VZlAu7zcOV+rXbYlF2cqB8txI/8aZajjp4Bqd+V6D5IgvKT" crossorigin="anonymous"></script>
        <script src="https://polyfill.io/v3/polyfill.min.js?features=Promise,XMLHttpRequest"></script>
        <script type="text/javascript" src="lang_pl.js?v7" id="lang_script"></script>
        <script type="text/javascript" src="common.js?v7"></script>
        <script type="text/javascript" src="index.js?v5"></script>
        <script type="text/javascript" src="common.js?v8"></script>
        <script type="text/javascript" src="index.js?v6"></script>
    </body>
</html>

 index.js

@@ -176,6 +176,7 @@
        
        times_timer = setTimeout(function(){ loadTimes(); loadRoute(); }, ttss_refresh);
    }).fail(fail_ajax).always(loading_end);
    return times_xhr;
}

function loadRoute(tripId, vehicleInfo) {
@@ -239,6 +240,7 @@
            route_table.appendChild(tr);
        }
    }).fail(fail_ajax);
    return route_xhr;
}

function startTimer(date) {
@@ -375,19 +377,10 @@
        
        if(!stop_id) setText(refresh_text, lang.select_stop_click_go);
    }).fail(fail_ajax);
    return stop_name_autocomplete_xhr;
}

function init() {
    if(!window.jQuery) {
        fail(lang.jquery_not_loaded);
        return;
    }
	
    $.ajaxSetup({
        dataType: 'json',
        timeout: 10000,
    });
	
    lang_select.addEventListener('input', function(e) {
        change_language(lang_select.value);
    });

 lang_en.js

@@ -9,7 +9,6 @@
    action_expand: 'Expand',
    action_collapse: 'Collapse',
    
    jquery_not_loaded: 'Required JavaScript jQuery library failed to load. You may try refreshing the page.',
    enter_stop_name_to_begin: 'Enter the stop name to begin.',
    select_stop_click_go: 'Select the stop and click "Go".',
    select_stop_type: {

 lang_pl.js

@@ -9,7 +9,6 @@
    action_expand: 'Rozwiń',
    action_collapse: 'Zwiń',
    
    jquery_not_loaded: 'Wymagana biblioteka jQuery nie została poprawnie załadowana. Spróbuj odświeżyć stronę.',
    enter_stop_name_to_begin: 'Zacznij wpisywać nazwę przystanku.',
    select_stop_click_go: 'Wyierz przystanek i kliknij "Dalej".',
    select_stop_type: {

 map.html

@@ -21,11 +21,10 @@
<div id="fail" class="ol-unselectable ol-control"><span></span> <span class="close">×</p></div>
</div>
<div id="panel"></div>
<script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha384-tsQFqpEReu7ZLhBV2VZlAu7zcOV+rXbYlF2cqB8txI/8aZajjp4Bqd+V6D5IgvKT" crossorigin="anonymous"></script>
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList"></script>
<script src="https://polyfill.io/v3/polyfill.min.js?features=Array.prototype.forEach,Array.prototype.includes,Array.prototype.map,Element.prototype.classList,Promise,String.prototype.startsWith,XMLHttpRequest,requestAnimationFrame"></script>
<script src="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io@master/en/v5.3.0/build/ol.js" integrity="sha384-iQkGyyH4ioz3m+maM3s9MX1Oq67mACa4B9Z3ovUv3Sv37LJ96fx3WnZfLoiC3Wfl" crossorigin="anonymous"></script>
<script tyle="text/javascript" src="lang_pl.js?v7" id="lang_script"></script>
<script tyle="text/javascript" src="common.js?v7"></script>
<script tyle="text/javascript" src="map.js?v19"></script>
<script tyle="text/javascript" src="common.js?v8"></script>
<script tyle="text/javascript" src="map.js?v20"></script>
</body>
</html>

 map.js

@@ -151,7 +151,7 @@

function fail_ajax_generic(data, fnc) {
    // abort() is not a failure
    if(data.readyState == 0 && data.statusText == 'abort') return;
    if(data.readyState == 0) return;
    
    if(data.status == 0) {
        fnc(lang.error_request_failed_connectivity, data);
@@ -247,7 +247,7 @@
function unstyleSelectedFeatures() {
    stop_selected_source.clear();
    route_source.clear();
    if(feature_clicked && ttss_types.indexOf(feature_clicked.getId().substr(0, 1)) >= 0) {
    if(feature_clicked && ttss_types.includes(feature_clicked.getId().substr(0, 1))) {
        styleVehicle(feature_clicked);
    }
}
@@ -315,7 +315,7 @@
        var stop = stops[i];
        
        if(stop.category == 'other') continue;
        if(stops_ignored.indexOf(stop.shortName) >= 0) continue;
        if(stops_ignored.includes(stop.shortName)) continue;
        
        stop.geometry = getGeometry(stop);
        var stop_feature = new ol.Feature(stop);
@@ -375,6 +375,7 @@
        }));
        route_layer.setVisible(true);
    });
    return path_xhr;
}

function vehicleTable(feature, table) {
@@ -423,6 +424,7 @@
        
        feature_timer = setTimeout(function() { vehicleTable(feature, table); }, ttss_refresh);
    }).fail(fail_ajax_popup);
    return feature_xhr;
}

function stopTable(stopType, stopId, table, ttss_type) {
@@ -476,6 +478,7 @@
        
        feature_timer = setTimeout(function() { stopTable(stopType, stopId, table, ttss_type); }, ttss_refresh);
    }).fail(fail_ajax_popup);
    return feature_xhr;
}

function featureClicked(feature) {
@@ -517,7 +520,7 @@
        typeName = '';
    }
    // Vehicle
    else if(ttss_types.indexOf(type) >= 0) {
    else if(ttss_types.includes(type)) {
        var span = displayVehicle(feature.get('vehicle_type'));
        
        additional = document.createElement('p');
@@ -537,7 +540,7 @@
        styleVehicle(feature, true);
    }
    // Stop or stop point
    else if(['s', 'p'].indexOf(type) >= 0) {
    else if(['s', 'p'].includes(type)) {
        var ttss_type = feature.getId().substr(1, 1);
        if(type == 's') {
            var second_type = lang.departures_for_buses;
@@ -561,7 +564,6 @@
                );
            }
        } else {
			
            stopTable('stopPoint', feature.get('stopPoint'), tbody, ttss_type);
            
            additional = document.createElement('p');
@@ -770,16 +772,6 @@
}

function init() {
    if(!window.jQuery) {
        fail(lang.jquery_not_loaded);
        return;
    }
	
    $.ajaxSetup({
        dataType: 'json',
        timeout: 10000,
    });
	
    panel = new Panel(document.getElementById('panel'));
    
    route_source = new ol.source.Vector({
@@ -948,7 +940,7 @@
    stops_type.forEach(function(type) {
        future_requests.push(updateStops(type.substr(0,1), type.substr(1,1)));
    });
    $.when(future_requests).done(hash);
    Deferred.all(future_requests).done(hash);
    
    window.addEventListener('hashchange', hash);