USER:PROTEINS FOLLOWRANDOMLINKONPAGE.JS

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Documentation for this user script can be added at User:Proteins/followrandomlinkonpage.

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//<pre>

// Travel to a random page linked in the article (a so-called "aleation" or an "aleatory fugue")

//

// To use this script, add "importScript('User:Proteins/followrandomlinkonpage.js');" to your monobook.js subpage 

// under your user page, as you can see at User:Proteins/monobook.js



function followRandomLinkOnPage() { 

	var alert_string = "";



	var top_node;



	var hyperlinks;

	var num_hyperlinks = 0;



	var random_double = 0.5;

	var random_hyperlink_index = 0;



	var random_link;

	var random_link_href = "";

	var random_link_title = "";



	var num_iterations = 0;

	var max_num_iterations = 100;



	var bad_link = true;



// Get the bodyContent node

	top_node = document.getElementById('bodyContent');

	if (!top_node) { 

		window.alert("There is no bodyContent node in this article.");

		return;

	}

 

// Get a list of the hyperlinks 

	hyperlinks = top_node.getElementsByTagName("A");

	if (!hyperlinks) { 

		window.alert("There are no hyperlinks in this article.");

		return;

	}

	num_hyperlinks = hyperlinks.length;

	if (num_hyperlinks < 1) { 

		window.alert("There are no hyperlinks in this article.");

		return;

	}

 

// Choose a random hyperlink 



	bad_link = true;

	num_iterations = 0;

	random_link = null;

	random_link_href = "";

	random_link_title = "";



	while ((num_iterations<max_num_iterations) && (bad_link)) {

		num_iterations++;



		random_double = num_hyperlinks * Math.random();

		random_hyperlink_index = Math.floor(random_double);

		if ((random_hyperlink_index < 0) || (random_hyperlink_index >= num_hyperlinks)) { continue; }



		random_link = hyperlinksrandom_hyperlink_index];

		random_link_href = random_link.href;

		random_link_title = random_link.title;



		if ((!random_link) || (!random_link_title) || (!random_link_title)) {

			// Check that all three exist

			continue;

		} else if (random_link.className) {

			// Don't follow external links

			continue;

		} else if (random_link_title.match(/\(page does not exist\)$/ig)) {

			// Don't follow red links

			continue;

		} else if (random_link_title.match(/^Image:/ig)) {

			// Don't follow Image links

			continue;

		} else if (random_link_title.match(/^Category:/ig)) {

			// Don't follow Category links

			continue;

		} else if (random_link_title.match(/^Special:/ig)) {

			// Don't follow links to Special pages

			continue;

 		} else if ((random_link_title.match(/^Edit\ssection:/i)) && (random_link_href.match(/action\=edit/i))) {

			// Don't follow edit links

			continue;

		}



		if (wgNamespaceNumber == 0) { // special behavior for Main article space

			if (random_link.id) { continue; }

			if (random_link_href.match(/Talk:/ig)) { continue; } 

			if (random_link_href.match(/Wikipedia:/ig)) { continue; } 

			if (random_link_href.match(/Wikipedia talk:/ig)) { continue; } 

			if (random_link_href.match(/Portal:/ig)) { continue; } 

			if (random_link_href.match(/Portal talk:/ig)) { continue; } 

			if (random_link_href.match(/User:/ig)) { continue; } 

			if (random_link_href.match(/User talk:/ig)) { continue; } 

			if (random_link_href.match(/Help:/ig)) { continue; } 

			if (random_link_href.match(/Help talk:/ig)) { continue; } 

			if (random_link_href.match(/Template:/ig)) { continue; } 

			if (random_link_href.match(/Template talk:/ig)) { continue; } 

			if (random_link_href.match(/Category:/ig)) { continue; } 

			if (random_link_href.match(/Category talk:/ig)) { continue; } 

			if (random_link_href.match(/File:/ig)) { continue; } 

			if (random_link_href.match(/File talk:/ig)) { continue; } 

			if (random_link_href.match(/MediaWiki:/ig)) { continue; } 

			if (random_link_href.match(/MediaWiki talk:/ig)) { continue; } 

		} // closes check for Main article space



		bad_link = false;



	} // closes loop generating a random hyperlink



// Follow the randomly chosen link to the new location



	if (bad_link == false) {

		alert_string = "Follow link to the page \"" + random_link_title + "\"\?\n";

		if (window.confirm(alert_string) == true) {

			window.open(random_link_href);

		}

	} else {

		alert_string = "Unable to find a suitable random link in " + max_num_iterations + " attempts.\n";

		window.alert(alert_string);

	}



} // closes function followRandomLinkOnPage()



addOnloadHook(function () {

mw.util.addPortletLink('p-navigation', 'javascript:followRandomLinkOnPage()', 'Follow a lucky link!', 'ca-lucky', 'Follow a randomly chosen link on this page', '@', '');

});

 

//</pre>

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