Automatically reaches for "next" page when the bottom of a given page has been reached (where applicable)
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// ==UserScript==
// @name Auto pagination
// @description Automatically reaches for "next" page when the bottom of a given page has been reached (where applicable)
// @include http://gamestorrent.co/page/*
// @require https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js
// @author iceman94
// @copyright 2017+, iceman94
// @version 0.1
// @grant none
// @namespace https://greasyfork.org/users/148290
// ==/UserScript==
//=======================================================================================================
// Cross-browsers load function
// Tests in this order :
// -support for jQuery API
// |-uses $(window).load method if available
// |-uses $(window).ready method if available
// -support for DOMContentLoaded event (compatible only with the following browsers :
// Chrome >= 0.2; Firefox >= 1.0; IE >= 9.0; Opera >= 9.0; Safari >= 3.1)
// -support for document.attachEvent
// -uses setTimeout w/ 5000ms delay
//=======================================================================================================
function XBLoad(func, verbose)
{
verbose = verbose || false;
if (window.jQuery)
{
if ($(window).load)
{
if (verbose == true) { console.log('Javascript loaded using $(window).load method'); };
return $(window).load(function() { func(); });
}
else if ($(window).ready)
{
if (verbose == true) { console.log('Javascript loaded using $(window).ready method'); };
return $(window).ready(function() { func(); });
};
}
else if (document.addEventListener)
{
if (verbose == true) { console.log('Javascript loaded using document.addEventListener method'); };
document.addEventListener('DOMContentLoaded', function(event)
{
return func();
});
}
else if (document.attachEvent)
{
if (verbose == true) { console.log('Javascript loaded using document.attachEvent method'); };
document.attachEvent('load', function()
{
return func();
});
}
else
{
if (verbose == true) { console.log('Javascript loaded using setTimeout method'); };
return setTimeout(function() { func(); }, 5000);
};
};
//=======================================================================================================
// Setting up functions
//=======================================================================================================
// Function to test if an URL is correctly formatted and reachable
function isUrl(url)
{
if (window.XMLHttpRequest)
{
request = new XMLHttpRequest();
}
else
{
request = new ActiveXObject('Microsoft.XMLHTTP');
};
try
{
request.open('GET', url, false);
request.send();
if (request.status !== 200)
{
return false;
};
}
catch(e)
{
return false;
};
return true;
};
// Detects which attribute work with the target browser
function testAttr()
{
var method;
if(document.body.scrollTop)
{
method = 'chrome';
} else if(document.documentElement.scrollTop)
{
method = 'firefox';
} else {
method = 'unsupported';
};
return method;
};
// Retrieves top scroll position (i.e. 0 = top)
function getScrollPos()
{
var scrollP;
switch(testAttr())
{
case 'chrome':
scrollP = document.body.scrollTop;
break;
case 'firefox':
scrollP = document.documentElement.scrollTop;
break;
default:
console.log('[getScrollPos] Only Firefox/Chrome based browsers are supported.');
};
return scrollP;
};
// Retrieves client (i.e. browser) height
function getWinHeight()
{
var winH;
switch(testAttr())
{
case 'chrome':
winH = document.body.clientHeight;
break;
case 'firefox':
winH = document.documentElement.clientHeight;
break;
default:
console.log('[getWinHeight] Only Firefox/Chrome based browsers are supported.');
};
return winH;
};
// Retrieves page height
function getScrollHeight()
{
var scrollH;
switch(testAttr())
{
case 'chrome':
scrollH = document.body.scrollHeight;
break;
case 'firefox':
scrollH = document.documentElement.scrollHeight;
break;
default:
console.log('[getScrollHeight] Only Firefox/Chrome based browsers are supported.');
};
return scrollH;
};
// Modify actual top scroll position to avoid triggering a script loop
function setScrollPos()
{
switch(testAttr())
{
case 'chrome':
document.body.scrollTop = document.body.scrollTop - ((document.body.scrollTop * 5) / 100) ;
break;
case 'firefox':
document.documentElement.scrollTop = document.documentElement.scrollTop - ((document.documentElement.scrollTop * 5) / 100);
break;
default:
console.log('[setScrollPos] Only Firefox/Chrome based browsers are supported.');
};
};
// Tests if scroll position has reached the bottom of the page
function isBottomReached()
{
var result;
if(getScrollPos() + getWinHeight() == getScrollHeight())
{
//console.log('Bottom of the page reached!');
result = true;
} else {
result = false;
};
return result;
};
// Returns position of "Next" button in page
function findNextPage()
{
var elmtObj = new Object();
//Is there an element w/ a ClassName called 'next'?
if(document.getElementsByClassName('next')[0])
{
elmtObj.type = 'tag';
elmtObj.content = document.getElementsByClassName('next')[0];
//console.log('[findNextPage] ', document.getElementsByClassName('next')[0]);
return elmtObj;
};
//Is there a tag w/ an attribute called 'next-page-url'?
var coll = document.getElementsByTagName('div');
var l = coll.length;
for (var i=0; i<l; i++)
{
if(coll[i] && coll[i].getAttribute('next-page-url'))
{
elmtObj.type = 'uri';
elmtObj.content = coll[i].getAttribute('next-page-url');
//console.log('[findNextPage] ', coll[i].getAttribute('next-page-url'));
return elmtObj;
};
};
//Is there a page (i.e. URI) ending w/ a number that follows the actual one?
//TBD
};
// Fetches next page based on target's element: tag (anchor, div, img...), attribute (src, class...), URI...
function goNext(tgtArr)
{
// WIP - May change to handle a wide variety of element
var type = findNextPage().type || undefined;
var content = findNextPage().content || undefined;
window.onscroll = function()
{
if(isBottomReached() === true)
{
switch(type)
{
case 'tag':
setScrollPos();
content.click();
break;
case 'attribute':
console.log('[goNext] "attribute" method not yet implemented.');
break;
case 'uri':
setScrollPos();
window.location = content;
break;
default:
console.log('[goNext] This type of element is actually not (yet?) managed by this script.');
};
} else {
//Do nothing for now
}
return false;
};
};
//=======================================================================================================
// Showtime !
//=======================================================================================================
XBLoad(goNext());