wiki.js

(function(win, doc, $) {
    'use strict';

    /*
        Togglers within articles (i.e.)
    */
    $('.toggleable').mozTogglers();

    /*
        Subscribe / unsubscribe to an article
    */
    $('.page-watch a').on('click', function(e) {
        e.preventDefault();

        var $link = $(this);
        if ($link.hasClass('disabled')) {
            return;
        }

        mdn.analytics.trackEvent({
            category: 'Page Watch',
            action: $link.text().trim()
        });

        var $form = $link.closest('form');

        var notification = mdn.Notifier.growl($link.data('subscribe-status'), { duration: 0, type: 'text' });

        $link.addClass('disabled');
        $.ajax($form.attr('action'), {
            cache: false,
            method: 'post',
            data: $form.serialize()
        }).done(function(data) {

            var message;
            if (Number(data.status) === 1) {
                $link.text($link.data('unsubscribe-text'));
                message = $link.data('subscribe-message');
            }
            else {
                $link.text($link.data('subscribe-text'));
                message = $link.data('unsubscribe-message');
            }

            notification.success(message, 2000);

            $link.removeClass('disabled');
        });
    });

    /*
        Add icons to external links if they don't have images
    */
    $('.external').each(function() {
        var $link = $(this);
        if (!$link.find('img').length) {
            $link.addClass('external-icon');
        }
    });

    /*
        Add intelligent break points to:
        - long article titles in document head
        - left nav
        - breadcrumbs
        Don't use this on anything that might have child elements
    */
    $('.document .document-head h1, .quick-links a code, .crumbs span[property=name]').each(function() {
        var $wrapper = $(this);
        // don't do anything if there are any child elements, they would be removed
        if ($wrapper.children().length > 0) {
            return;
        }

        /*
         * split on 3 lowercase characters in a row (try to avoid breaking acronyms)
         *     - splitting here is a bit of a hack to get around lack of look behind in jS
         * IF followed by [ . : ( OR capital letter
         * IF followed by 3 letters or [ @ . : (
         */
        $wrapper.text(
            $wrapper.text().replace(
                /([a-z]{3})(?=[[.:(A-Z][@.:(A-Z]{0,}[a-zA-Z]{3})/g,'$1\u200b'
            )
        );
    });

    /*
        Syntax highlighting scripts
    */
    if ($('article pre').length && ('querySelectorAll' in doc)) {
        if (mdn.assets && mdn.assets.js.hasOwnProperty('syntax-prism')) {
            (function() {
                mdn.assets.js['syntax-prism'].forEach(function(url, index, array) {
                    /*
                       Note: In development, multiple scripts are loaded, and the
                       later scripts use Prism, which is declared in the first
                       script.  This means syntax highlighting often doesn't work
                       on the first page load. Refresh, and syntax highlighing
                       should work.

                       To fix this, we'd have to use something like require.js or
                       in-client merging of JS files.  Maybe django-pipeline will
                       help as well.
                     */
                    var syntaxScript = doc.createElement('script');
                    syntaxScript.async = array.length === 1;
                    if (index === 0) {
                        syntaxScript.setAttribute('data-manual', 'true');
                    }
                    syntaxScript.src = url;
                    doc.head.appendChild(syntaxScript);
                });
            })();
        }
    }

    /*
        Track clicks on access menu items
    */
    $('#nav-access').on('click contextmenu', 'a', function(event) {
        var $thisLink = $(this);
        var url = $thisLink.attr('href');

        var data = {
            category: 'Access Links',
            action: $thisLink.text(),
            label: $thisLink.attr('href')
        };

        mdn.analytics.trackLink(event, url, data);

        // dimension11 is "skiplinks user"
        if (win.ga) {
            ga('set', 'dimension11', 'Yes');
        }
    });


    /*
        Track clicks on main nav links
    */
    $('#main-nav').on('click contextmenu', 'a', function(event) {
        var url = this.href;
        var data = {
            category: 'Wiki',
            action: 'Main Nav',
            label: url
        };

        mdn.analytics.trackLink(event, url, data);
    });

    /*
        Track clicks on Crumb links
    */
    $('.crumbs').on('click contextmenu', 'a', function(event) {
        var url = this.href;
        var data = {
            category: 'Wiki',
            action: 'Crumbs',
            label: url
        };

        mdn.analytics.trackLink(event, url, data);
    });

    /*
        Compat table table setup
    */
    $('.htab').each(function(index) {
        var $htab = $(this);
        var $items = $htab.find('>ul>li');

        $htab.append($('div[id=compat-desktop]')[index]);
        $htab.append($('div[id=compat-mobile]')[index]);

        $items.find('a').on('click mdn:click', function(e) {
            var $this = $(this);
            if (e) {
                e.preventDefault();
                e.stopPropagation();
            }
            $items.removeClass('selected');
            $this.parent().addClass('selected');
            $htab.find('>div').hide().eq($items.index($this.parent())).show();
        }).eq(0).trigger('mdn:click');
    });

    /*
        Bottom language checker autosubmit
    */
    $('.wiki-l10n').on('change', function() {
        if (this.value) {
            win.location = this.value;
        }
    });

    /*
        Adds a context menu to edit page or view history
    */
    $('body[contextmenu=edit-history-menu]').mozContextMenu(function(target, $contextMenu) {
        var $body = $('body');
        var isTextSelected = !document.getSelection().isCollapsed;
        var isLinkTargeted = ($(target).is('a') || $(target).parents().is('a'));
        var isImageTargeted = $(target).is('img');

        if (isLinkTargeted || isTextSelected || isImageTargeted) {
            $body.attr('contextmenu', '');
        }

        $contextMenu.on('click', function(e) {
            window.location.href = $(e.target).data('action') + '?src=context';
        });
    });

    /*
        Kumascript error detected
    */
    // is there an error?
    var $kserrors = $('#kserrors');
    if ($kserrors.length){
        // enable the details toggle
        var $kserrorsToggle = $kserrors.find('.kserrors-details-toggle');
        var $kserrorsDetails = $kserrors.find('.kserrors-details');
        $kserrorsToggle.toggleMessage({
            toggleCallback: function() {
                $kserrorsDetails.toggleClass('hidden');
            }
        });
        // loop through error list and log errors
        var $kserrorsList = $('#kserrors-list');
        if ($kserrorsList.length){
            $kserrorsList.each(function(){
                var $thisError = $(this);
                var errorType = $thisError.find('.kserror-type').text().trim();
                var errorMacro = $thisError.find('.kserror-macro').text().trim();
                var errorParse = $thisError.find('.kserror-parse').text().trim().replace(/\s\s+/g, ' ');
                mdn.analytics.trackError('Kumascript Error', errorType, 'in: ' + errorMacro + '; parsing: ' + errorParse );
            });
        } else {
            // generic error recorded - no details if user not logged in
            mdn.analytics.trackError('Kumascript Error', 'generic error');
        }
    }

    /*
        Track untranslated pages
    */
    // is there an translation banner?
    var $docPending = $('#doc-pending-fallback');
    if ($docPending.length){
        mdn.analytics.trackError('Translation Pending', 'displayed');
    }

    /*
        Stack overflow search form, used for dev program
        ex: http://stackoverflow.com/search?q=[firefox]+or+[firefox-os]+or+[html5-apps]+foobar
    */
    $('.stack-form').html('<form action="http://stackoverflow.com/search"><i class="stack-icon" aria-hidden="true"></i><label for="stack-search" class="offscreen">' + gettext('Search Stack Overflow') + '</label><input id="stack-search" placeholder="' + gettext('Search Stack Overflow') + '" /><button type="submit" class="offscreen">Submit Search</button></form>').find('form').on('submit', function(e) {
        e.preventDefault();

        var value = $(this).find('#stack-search').val();

        if (value !== '') {
            win.location = 'http://stackoverflow.com/search?q=[firefox]+or+[firefox-os]+or+[html5-apps]+' + value;
        }
    });


    /*
       Bug 981409 - Add some CSS fallback for browsers without MathML support.

       This is based on
       https://developer.mozilla.org/en-US/docs/Web/MathML/Authoring#Fallback_for_Browsers_without)MathML_support
       and https://github.com/fred-wang/mathml.css.
    */
    if ($('math').length) {
        (function() {
            // Test for MathML support
            var $div = $('<div class="offscreen"><math xmlns="http://www.w3.org/1998/Math/MathML"><mspace height="23px" width="77px"/></math></div>').appendTo(document.body);
            var box = $div.get(0).firstChild.firstChild.getBoundingClientRect();
            $div.remove();

            var supportsMathML = Math.abs(box.height - 23) <= 1 && Math.abs(box.width - 77) <= 1;
            if (!supportsMathML) {
                // Add CSS fallback
                $('<link href="' + mdn.staticPath + 'styles/libs/mathml.css" rel="stylesheet" type="text/css" />').appendTo(doc.head);

                // Add notification
                $('#wikiArticle').prepend('<div class="notice"><p>' + gettext('Your browser does not support MathML. A CSS fallback has been used instead.') + '</p></div>');
            }
        })();
    }

    /*
      Make Compare selected revisions button sticky when scrolling history page
    */
    (function() {
        var $button = $('.revision-list-controls .link-btn');
        if ($button.length) {
            var revisionButtonOffset = $button.offset().top;
            $(win).on('scroll', function() {
                var $compareButton = $button;
                var scroll = $(this).scrollTop();
                $compareButton.toggleClass('fixed', scroll >= revisionButtonOffset);
            });
        }
    })();

    /*
        Track YouTube videos
    */
    (function(){
        var $youtubeIframes = $('iframe[src*="youtube.com/embed"]');
        var players = [];
        var timeoutFlag = 1;
        var timer;

        function timeout() {
            var fraction;
            timeoutFlag = 1;
            $.each(players, function(index, player) {
                if (player.getPlayerState() !== 1) {
                    return;
                }

                timeoutFlag = 0;

                fraction = player.getCurrentTime() / player.getDuration();

                if (!player.checkpoint) {
                    player.checkpoint = 0.1 + Math.round(fraction * 10) / 10;
                }

                if (fraction > player.checkpoint) {
                    mdn.analytics.trackEvent({
                        category: 'YouTube',
                        action: 'Percent Completed',
                        label: player.getVideoUrl(),
                        value: Math.round(player.checkpoint * 100)
                    });

                    // 10% checkpoints for analytics
                    player.checkpoint += 0.1;
                }
            });

            if (timeoutFlag) {
                if (timer) {
                    clearTimeout(timer);
                }
            } else {
                timer = setTimeout(timeout, 6000);
            }
        }

        // If the page does not have any YouTube videos
        if (!$youtubeIframes.length) {
            return;
        }

        var origin = win.location.protocol + '//' + win.location.hostname +
                    (win.location.port ? ':' + win.location.port: '');

        //Enable JS API on all YouTube iframes, might cause flicker!
        $youtubeIframes.each(function() {
            $(this).attr('src', function(i, src){
                return src + (src.split('?')[1] ? '&':'?') + '&enablejsapi=1&origin=' + origin;
            });
        });

        // Load YouTube Iframe API
        var youtubeScript = doc.createElement('script');
        youtubeScript.async = 'true';
        youtubeScript.src = '//www.youtube.com/iframe_api';
        doc.body.appendChild(youtubeScript);


        // Method executed by YouTube API, needs to be global
        win.onYouTubeIframeAPIReady = function() {
            $youtubeIframes.each(function(i){
                players[i] = new window.YT.Player($(this).get(0));

                players[i].addEventListener('onStateChange', function(event) {
                    var action;
                    switch(event.data) {
                        case 0: // YT.PlayerState.ENDED
                            action = 'Finished';
                            break;
                        case 1: // YT.PlayerState.PLAYING
                            action = 'Play';
                            if (timeoutFlag){
                                timeout();
                            }
                            break;
                        case 2: // YT.PlayerState.PAUSED
                            action = 'Pause';
                            break;
                        case 3: // YT.PlayerState.BUFFERING
                            action = 'Buffering';
                            break;
                        default:
                            return;
                    }
                    mdn.analytics.trackEvent({
                        category: 'YouTube',
                        action: action,
                        label: players[i].getVideoUrl()
                    });
                });
                players[i].addEventListener('onPlaybackQualityChange', function(event) {
                    var value;
                    //quality is highres, hd1080, hd720, large, medium and small
                    switch(event.data) {
                        case 'small':
                            value = 240;
                            break;
                        case 'medium':
                            value = 360;
                            break;
                        case 'large':
                            value = 480;
                            break;
                        case 'hd720':
                            value = 720;
                            break;
                        case 'hd1080':
                            value = 1080;
                            break;
                        case 'highres': //higher than 1080p
                            value = 1440;
                            break;
                        default: //undefined
                            value = 0;
                    }
                    mdn.analytics.trackEvent({
                        category: 'YouTube',
                        action: 'Playback Quality',
                        label: players[i].getVideoUrl(),
                        value: value
                    });
                });
                players[i].addEventListener('onError', function(event) {
                    mdn.analytics.trackError('YouTube Error', event.data);
                });
            });
        };
    })();

    // Make <summary> and <details> tags work even if the browser doesn't support them.
    // From http://mathiasbynens.be/notes/html5-details-jquery
    function initDetailsTags() {
        // test for browser support of details from http://mathiasbynens.be/notes/html5-details-jquery
        var supportsDetails = (function(doc) {
            var el = doc.createElement('details');
            var isFake;
            var root;
            var diff;
            if (!('open' in el)) {
                return false;
            }
            root = doc.body || (function() {
                var de = doc.documentElement;
                isFake = true;
                return de.insertBefore(doc.createElement('body'), de.firstElementChild || de.firstChild);
            }());
            el.innerHTML = '<summary>a</summary>b';
            el.style.display = 'block';
            root.appendChild(el);
            diff = el.offsetHeight;
            el.open = true;
            diff = diff !== el.offsetHeight;
            root.removeChild(el);
            if (isFake) {
                root.parentNode.removeChild(root);
            }
            return diff;
        }(document));

        // No reason to move further if details are supported!
        if (supportsDetails) {
            return;
        }

        // Note <details> tag support. Modernizr doesn't do this properly as of 1.5; it thinks Firefox 4 can do it, even though the tag has no "open" attr.
        $('details').addClass('no-details').each(function() {
            // Store a reference to the current `details` element in a variable
            var $details = $(this);
            // Store a reference to the `summary` element of the current `details` element (if any) in a variable
            var $detailsSummary = $('summary', $details);
            // Do the same for the info within the `details` element
            var $detailsNotSummary = $details.children(':not(summary)');
            // This will be used later to look for direct child text nodes
            var $detailsNotSummaryContents = $details.contents(':not(summary)');

            // If there is no `summary` in the current `details` element...
            if (!$detailsSummary.length) {
                // ...create one with default text
                $detailsSummary = $(doc.createElement('summary')).text(gettext('Details')).prependTo($details);
            }

            // Look for direct child text nodes
            if ($detailsNotSummary.length !== $detailsNotSummaryContents.length) {
                // Wrap child text nodes in a `span` element
                $detailsNotSummaryContents.filter(function() {
                    // Only keep the node in the collection if it's a text node containing more than only whitespace
                    return (this.nodeType === 3) && (/[^\t\n\r ]/.test(this.data));
                }).wrap('<span>');
                // There are now no direct child text nodes anymore -- they're wrapped in `span` elements
                $detailsNotSummary = $details.children(':not(summary)');
            }

            // Hide content unless there's an `open` attribute
            if (typeof $details.attr('open') !== 'undefined') {
                $details.addClass('open');
                $detailsNotSummary.show();
            } else {
                $detailsNotSummary.hide();
            }

            // add ARIA, tabindex, listeners and events
            $detailsSummary.attr('tabindex', 0).attr('role', 'button').on('click', function() {
                // Focus on the `summary` element
                $detailsSummary.focus();
                // Toggle the `open` attribute of the `details` element
                if (typeof $details.attr('open') !== 'undefined') {
                    $details.removeAttr('open');
                    $detailsSummary.attr('aria-expanded', 'false');
                } else {
                    $details.attr('open', 'open');
                    $detailsSummary.attr('aria-expanded', 'true');
                }
                // Toggle the additional information in the `details` element
                $detailsNotSummary.slideToggle();
                $details.toggleClass('open');
            }).on('keyup', function(ev) {
                if (32 === ev.keyCode || 13 === ev.keyCode) {
                    // Opera already seems to trigger the `click` event when Enter is pressed
                    ev.preventDefault();
                    $detailsSummary.click();
                }
            });
        });
    }


    if ($('details').length){
        initDetailsTags();
    }


    /**
     * Generates a storage key based on pathname
     * copied from wiki-edit-draft.js because: race conditions
     * does not need to copy logic for dealing with new translations
     */
    function getDraftStorageKey() {
        // start with path
        var key = win.location.pathname;
        // remove $vars
        key = key.replace('$edit', '');
        key = key.replace('$translate', '');
        key = 'draft/edit' + key;
        key = $.trim(key);
        return key;
    }

    // check for rev_saved in query string
    var revisionSaved = win.mdn.getUrlParameter('rev_saved');
    var storageKey = getDraftStorageKey();
    if (win.location.href.indexOf('rev_saved') > -1 && win.mdn.features.localStorage) {
        var draftRevision = localStorage.getItem(storageKey + '#revision');
        // check for drafts matching query string
        if (draftRevision === revisionSaved) {
            // delete matching draft, save-time, and revisionId
            localStorage.removeItem(storageKey);
            localStorage.removeItem(storageKey + '#save-time');
            localStorage.removeItem(storageKey + '#revision');
        }
        // remove query string
        var location = win.location;
        if (win.history.replaceState) {
            win.history.replaceState({}, '', location.pathname);
        }
    }
})(window, document, jQuery);