Created
June 2, 2015 12:31
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Makes OLX (slando) render large image previews
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// ==UserScript== | |
// @name OLX Previews | |
// @namespace http://use.i.E.your.homepage/ | |
// @version 0.1 | |
// @description Makes OLX (slando) render large image previews | |
// @match http://kiev.ko.olx.ua/nedvizhimost* | |
// @copyright 2015+, Yuriy Bogdanov | |
// ==/UserScript== | |
;(function(){ | |
var q = asyncQueue(loadThumb, 4), | |
timeout = 10000, | |
running = 0 | |
setInterval(function(){ | |
$('td.offer a.link').filter(":not([handled])").each(function(i, a) { | |
q.push({el: a, retryN: 0}) | |
}) | |
}, 1000) | |
// To restore console.log() | |
// var i = document.createElement('iframe'); | |
// i.style.display = 'none'; | |
// document.body.appendChild(i); | |
// window.console = i.contentWindow.console; | |
var interv = setInterval(function(){ | |
if (q.running() + running + q.length() == 0) { | |
clearInterval(interv) | |
} | |
console.log("Running %d (within queue %d), queue length %d", running, q.running(), q.length()) | |
}, 5000) | |
function loadThumb(task, callback) { | |
var a = $(task.el) | |
var wrapper = a.closest('tbody') | |
a.attr('handled', true) | |
var req = new XMLHttpRequest() | |
req.open("get", a.attr('href'), true) | |
running++ | |
var makeThumbsContainer = function() { | |
wrapper.find('tr.super-thumbs').remove() | |
var thumbsContainer = $('<tr class="super-thumbs">') | |
var td = $("<td>").attr("colspan", wrapper.find('td').length).appendTo(thumbsContainer) | |
var div = $("<div>").appendTo(td) | |
thumbsContainer.appendTo(wrapper) | |
return div | |
} | |
var done = function() { | |
if (req.readyState != 0) { // not UNSENT | |
req.abort() | |
} | |
callback && callback() | |
running-- | |
} | |
var t = setTimeout(function() { | |
req.onload = function(){} | |
if (task.retryN == 0) { | |
task.retryN++ | |
loadThumb(task) | |
} | |
else { | |
var retryA = $('<a href="javascript:void(0)">').append("retry").click(function(){ | |
loadThumb(task) | |
}) | |
makeThumbsContainer().append("Timeout ").append(retryA) | |
} | |
done() | |
}, timeout) | |
var loadingTxt = task.retryN == 0 ? "Loading..." : "Loading (" + task.retryN + ") ..." | |
makeThumbsContainer().append(loadingTxt) | |
req.onload = function() { | |
if (t) clearTimeout(t) | |
var images = $(req.responseText).contents().find('#offerdescription .bigImage') | |
if (!images.length) { | |
wrapper.find('tr.super-thumbs').remove() | |
return done() | |
} | |
wrapper.find("td[width=120]").remove() | |
var thumbsDiv = makeThumbsContainer().css({ | |
height: 350, | |
overflowY: "scroll", | |
whiteSpace: "nowrap" | |
}) | |
images.each(function(i, v){ | |
if (i > 5) return | |
var imgEl = $('<img>').attr('src', v.src).css({ | |
height: 350 | |
}) | |
var aWrap = $('<a>').attr('href', a.attr('href')).append(imgEl) | |
thumbsDiv.append(aWrap) | |
}) | |
done() | |
} | |
req.send() | |
} | |
function asyncQueue(worker, concurrency) { | |
if (concurrency === undefined) { | |
concurrency = 1; | |
} | |
var _isArray = Array.isArray || function (obj) { | |
return _toString.call(obj) === '[object Array]'; | |
}; | |
var _each = function (arr, iterator) { | |
if (arr.forEach) { | |
return arr.forEach(iterator); | |
} | |
for (var i = 0; i < arr.length; i += 1) { | |
iterator(arr[i], i, arr); | |
} | |
}; | |
function only_once(fn) { | |
var called = false; | |
return function() { | |
if (called) throw new Error("Callback was already called."); | |
called = true; | |
fn.apply(window, arguments); | |
} | |
} | |
function _insert(q, data, pos, callback) { | |
if (!q.started){ | |
q.started = true; | |
} | |
if (!_isArray(data)) { | |
data = [data]; | |
} | |
if(data.length == 0) { | |
// call drain immediately if there are no tasks | |
return setTimeout(function() { | |
if (q.drain) { | |
q.drain(); | |
} | |
}, 0); | |
} | |
_each(data, function(task) { | |
var item = { | |
data: task, | |
callback: typeof callback === 'function' ? callback : null | |
}; | |
if (pos) { | |
q.tasks.unshift(item); | |
} else { | |
q.tasks.push(item); | |
} | |
if (q.saturated && q.tasks.length === q.concurrency) { | |
q.saturated(); | |
} | |
setTimeout(q.process, 0); | |
}); | |
} | |
var workers = 0; | |
var q = { | |
tasks: [], | |
concurrency: concurrency, | |
saturated: null, | |
empty: null, | |
drain: null, | |
started: false, | |
paused: false, | |
push: function (data, callback) { | |
_insert(q, data, false, callback); | |
}, | |
kill: function () { | |
q.drain = null; | |
q.tasks = []; | |
}, | |
unshift: function (data, callback) { | |
_insert(q, data, true, callback); | |
}, | |
process: function () { | |
if (!q.paused && workers < q.concurrency && q.tasks.length) { | |
var task = q.tasks.shift(); | |
if (q.empty && q.tasks.length === 0) { | |
q.empty(); | |
} | |
workers += 1; | |
var next = function () { | |
workers -= 1; | |
if (task.callback) { | |
task.callback.apply(task, arguments); | |
} | |
if (q.drain && q.tasks.length + workers === 0) { | |
q.drain(); | |
} | |
q.process(); | |
}; | |
var cb = only_once(next); | |
worker(task.data, cb); | |
} | |
}, | |
length: function () { | |
return q.tasks.length; | |
}, | |
running: function () { | |
return workers; | |
}, | |
idle: function() { | |
return q.tasks.length + workers === 0; | |
}, | |
pause: function () { | |
if (q.paused === true) { return; } | |
q.paused = true; | |
q.process(); | |
}, | |
resume: function () { | |
if (q.paused === false) { return; } | |
q.paused = false; | |
q.process(); | |
} | |
}; | |
return q; | |
} | |
})() |
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