User:Proteins/showrandomlinksonpage.js

//

// Create a slideshow of random articles linked in the article (a so-called "aleation" or an "aleatory fugue")
//
// To use this script, add "importScript('User:Proteins/showrandomlinksonpage.js');" to your monobook.js subpage
// under your user page, as you can see at User:Proteins/monobook.js
// Global variables
var new_window;
var wait_time = 0;
var random_link_index = 0;
var random_link_href_list = new Array();
var random_link_title_list = new Array();
function timeoutRoutine()
{
alert("Wait = " + wait_time + "  Slide " + random_link_index + ": " + random_link_title_list[random_link_index]);
new_window.location = random_link_href_list[random_link_index];
}
function showRandomLinksOnPage() {
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;
var num_random_links = 0;
// 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;
}
num_random_links = 5;
random_link_index = 0;
random_link_href_list[0] = "";
random_link_title_list[0] = "";
while (random_link_index < num_random_links) {
// Choose a random hyperlink
bad_link = true;
num_iterations = 0;
random_link = null;
random_link_href = "";
random_link_title = "";
while ((num_iterations
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 = hyperlinks[random_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
// Add the randomly chosen link to the list
if (bad_link == false) {
random_link_index++;
random_link_href_list[random_link_index] = random_link_href;
random_link_title_list[random_link_index] = random_link_title;
} else {
alert_string = "Unable to find a suitable random link " + random_link_index + " in " + max_num_iterations + " attempts.\n";
window.alert(alert_string);
break;
}
}
num_random_links = random_link_index;
if (num_random_links > 0) {
alert_string = "Show slideshow of " + num_random_links + " random links from this page\?\n\n";
for (random_link_index=1;
random_link_index<=num_random_links;
random_link_index++) {
alert_string += random_link_title_list[random_link_index] + "\n";
if (random_link_index%5 == 0) { alert_string += "\n"; }
}
if (window.confirm(alert_string) == false) { return; }
random_link_href = random_link_href_list[1];
new_window = window.open(random_link_href, "new_window");
random_link_index = 2;
new_window.setTimeout("timeoutRoutine();", 3000);
//		for (random_link_index=2;
//		     random_link_index<=num_random_links;
//		     random_link_index++) {
//				if (window.confirm("Continue slideshow to \"" + random_link_title_list[random_link_index] + "\"\?") == false) { return; }
//				random_link_href = random_link_href_list[random_link_index];
//				new_window.location = random_link_href;
//				wait_time = 3000 * (random_link_index - 1);
//				new_window.setTimeout("timeoutRoutine();", wait_time);
//new_window.setTimeout("new_window.location=" + random_link_href_list[random_link_index]+ ";",wait_time);
//   new_window.setTimeout("if (new_window.confirm('Continue slideshow?') == false) { break; }",800);
//		}
}
} // closes function showRandomLinksOnPage()
$(function () {
mw.util.addPortletLink('p-navigation', 'javascript:showRandomLinksOnPage()', 'Show random links', 'ca-slideshow', 'Show sequence of random links from this page', '$', '');
});
//