/
injected.js
148 lines (116 loc) · 2.94 KB
/
injected.js
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(function(){
var debug = true;
var noProgrammaticScrollingEver = false;
var enabled = true;
if (typeof dsj_events != 'undefined') {
dsj_events('create', 'UA-78286573-1', 'auto');
dsj_events('set', 'page', 'extension.instance');
dsj_events('set', 'title', 'extension instance');
}
function dsj_event(action){
if (typeof dsj_events != 'undefined') {
dsj_events('send', 'event', 'extension', action);
}
}
function dsj_event_detail(action, label, value){
if (typeof dsj_events != 'undefined') {
dsj_events('send', 'event', 'extension', action, label, value);
}
}
function dsj_exception(err){
if (typeof dsj_events != 'undefined') {
dsj_events('send', 'exception', {
'exDescription': 'initialisation error: '+err.message,
'exFatal': false
});
}
}
document.addEventListener('initScrollJackerPreventer', function(e){
var settings = e.detail;
try {
init(settings);
var levels = ['off', 'medium', 'strict'];
dsj_event_detail('initialised', 'strictness', levels.indexOf(settings.strictness));
if (settings.debug){
dsj_event_detail('initialised', 'debug', 1);
}
} catch (err) {
dsj_exception(err);
}
});
dsj_event('injected');
var eventBlacklist = [
"mousemove",
"scroll",
"mousewheel",
"DOMMouseScroll",
"DomMouseScroll",
"MozMousePixelScroll",
"wheel",
"hashchange"
];
var windowFunctionsToWrap = [
"scrollTo",
"scroll",
"scrollBy"
];
var noProgrammaticScrolling = false;
function wrapBlacklistedEventsFromElement(ele, $){
var wrapEventHandler = function(event){
return function (e){
noProgrammaticScrolling = true;
event.handler(e);
if (!noProgrammaticScrollingEver){
noProgrammaticScrolling = false;
}
};
};
var events = $._data( ele, "events" );
for (var eventName in events){
if (eventBlacklist.indexOf(eventName) != -1){
var newEventHandlers = events[eventName].map(wrapEventHandler);
$(ele).off(eventName);
for (var i in newEventHandlers){
$(ele).on(eventName, newEventHandlers[i]);
}
}
}
}
function wrap(original){
return function(){
if (!noProgrammaticScrolling){
original.apply(window, arguments);
} else {
if (debug){
console.log("Blocked wrapped function as programmatic scrolling is disabled");
}
}
};
}
function wrapWindowFunction(name){
window[name] = wrap(window[name]);
}
function init(settings){
debug = settings.debug;
switch (settings.strictness){
case "strict":
noProgrammaticScrollingEver = true;
break;
case "medium":
break;
case "off":
enabled = false;
break;
}
if (enabled){
if (typeof jQuery != 'undefined'){
var $ = jQuery;
$.fn.scrollTo = wrap($.fn.scrollTo);
wrapBlacklistedEventsFromElement(window, $);
wrapBlacklistedEventsFromElement(document, $);
wrapBlacklistedEventsFromElement(document.body, $);
}
windowFunctionsToWrap.forEach(wrapWindowFunction);
}
}
})();