Auto pagination

Automatically reaches for "next" page when the bottom of a given page has been reached (where applicable)

As of 2017-08-11. See the latest version.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==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==

//https://chan\.sankakucomplex\.com/\?(|(prev|next)=\d{1,99}&)tags=.*(|&page=\d{1,99})$/
//=======================================================================================================
// 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());