MediaWiki/Slideshow

If you're using MediaWiki, then you are accustomed to being able to quickly and efficiently organize your thoughts. It's a natural extension then to want to use those same "notes" in a presentation. There are many ways to achieve such a result.

One method is to simply parse the wiki markup itself and turn that into slides by effectively walking through the structure of the page (one slide for each section, and stepping through the bullets). For this approach, a Greasemonkey script will do.

Dan Phiffer wrote the following Greasemonkey script that turns any MediaWiki article into a slide presentation. The CSS was changed just a bit by Greg Rundlett to ensure compatibility with projectors.

// ==UserScript==
// @name           Wikipedia Presentation
// @namespace      http://phiffer.org/
// @description    Turn a Wikipedia article into a presentation
// ==/UserScript==

var wikipedia_presentation = {
    setup: function() {
        
        this.sections = [];
        this.pos = 0;
        
        var body = document.getElementsByTagName('body')[0];
        this.orig_markup = body.innerHTML;
        var markup = body.innerHTML;
        var start = 0;
        var end = markup.indexOf('<span class="editsection"');
        while (end != -1) {
            start = markup.indexOf('</span>', end);
            end = markup.indexOf('<span class="editsection"', start);
            if (end == -1) {
                end = markup.indexOf('<div class="printfooter">', start);
                this.sections.push(markup.substr(start, end - start));
                end = -1;
            }
            this.sections.push(markup.substr(start, end - start));
        }
        if (this.sections.length > 0) {
            var div = document.getElementById('bodyContent');
            var link = div.insertBefore(document.createElement('a'), div.firstChild);
            link.innerHTML = 'Start presentation';
            link.setAttribute('href', '#presentation');
            link.addEventListener('click', this.start, false);
        }
    },
    
    start: function() {
        var body = document.getElementsByTagName('body')[0];
        body.innerHTML = '';
        body.style.textAlign = 'center';
        
        var prev = body.appendChild(document.createElement('a'));
        prev.innerHTML = '&larr; Prev';
        prev.setAttribute('href', '#prev');
        prev.style.font = '11px verdana, sans-serif';
        prev.addEventListener('click', function() {
           wikipedia_presentation.prev();
        }, false);
        
        body.appendChild(document.createTextNode(' / '));
        
        var stop = body.appendChild(document.createElement('a'));
        stop.innerHTML = 'Exit';
        stop.setAttribute('href', '#exit');
        stop.style.font = '11px verdana, sans-serif';
        stop.addEventListener('click', function() {
           wikipedia_presentation.stop();
        }, false);
        
        body.appendChild(document.createTextNode(' / '));
        
        var next = body.appendChild(document.createElement('a'));
        next.innerHTML = 'Next &rarr;';
        next.setAttribute('href', '#next');
        next.style.font = '11px verdana, sans-serif';
        next.addEventListener('click', function() {
           wikipedia_presentation.next();
        }, false);
        
        var slide = body.appendChild(document.createElement('div'));
        slide.setAttribute('id', 'wikipedia_presentation');
        slide.style.width = '780px';
        // slide.style.background = 'red';
        slide.style.margin = '10px 10px 10px 20px';
        slide.style.textAlign = 'left';
        slide.style.font = '2em verdana, sans-serif';
        
        slide.innerHTML = wikipedia_presentation.sections[0];
        var items = slide.getElementsByTagName('li');
        for (var i = 1; i < items.length; i++) {
            items[i].style.display = 'none';
        }
        
        document.addEventListener('keypress', wikipedia_presentation.keypress, false);
    },
    
    stop: function() {
        var body = document.getElementsByTagName('body')[0];
        body.innerHTML = wikipedia_presentation.orig_markup;
        body.style.textAlign = 'left';
        wikipedia_presentation.setup();
        document.removeEventListener('keypress', wikipedia_presentation.keypress, false);
    },
    
    keypress: function(event) {
        if (event.keyCode == 39) {
            wikipedia_presentation.next();
        } else if (event.keyCode == 37) {
            wikipedia_presentation.prev();
        }
    },
    
    prev: function() {
        this.pos--;
        if (this.pos == -1) {
            this.pos = this.sections.length - 1;
        }
        var slide = document.getElementById('wikipedia_presentation');
        slide.innerHTML = wikipedia_presentation.sections[this.pos];
    },
    
    next: function() {
        
        var slide = document.getElementById('wikipedia_presentation');
        var items = slide.getElementsByTagName('li');
        
        var hidden = 0;
        for (var i = 0; i < items.length; i++) {
            if (items[i].style.display == 'none') {
                hidden++;
            }
        }
        
        if (hidden > 0) {
            items[items.length - hidden].style.display = 'list-item';
            return;
        }
        
        this.pos++;
        if (this.pos == this.sections.length) {
            this.pos = 0;
        }
        slide.innerHTML = wikipedia_presentation.sections[this.pos];
        var items = slide.getElementsByTagName('li');
        for (var i = 1; i < items.length; i++) {
            items[i].style.display = 'none';
        }
        
    }
};

wikipedia_presentation.setup();