Difference between revisions of "MediaWiki:Common.js"

Revision as of 11:26, 22 December 2009

/* Any JavaScript here will be loaded for all users on every page load. */

/**
 * Tests if a particular element possesses a class.
 */
var hasClass = (function () {
    var reCache = {};
    return function (element, className) {
        return (reCache[className] ? reCache[className] : (reCache[className] = new RegExp("(?:\\s|^)" + className + "(?:\\s|$)"))).test(element.className);
    };
})();


/**
 * Code for collapsible tables.
 */
var autoCollapse = 2;
var collapseCaption = "hide";
var expandCaption = "show";

function collapseTable(tableIndex) {
    var Button = document.getElementById("collapseButton" + tableIndex);
    var Table = document.getElementById("collapsibleTable" + tableIndex);

    if (!Table || !Button) {
        return false;
    }

    var Rows = Table.rows;

    if (Button.firstChild.data == collapseCaption) {
        for (var i = 1; i < Rows.length; i++) {
            Rows[i].style.display = "none";
        }
        Button.firstChild.data = expandCaption;
    } else {
        for (var i = 1; i < Rows.length; i++) {
            Rows[i].style.display = Rows[0].style.display;
        }
        Button.firstChild.data = collapseCaption;
    }
}

function createCollapseButtons() {
    var tableIndex = 0;
    var NavigationBoxes = new Object();
    var Tables = document.getElementsByTagName("table");

    for (var i = 0; i < Tables.length; i++) {
        if (hasClass(Tables[i], "collapsible")) {
            /* only add button and increment count if there is a header row to work with */
            var HeaderRow = Tables[i].getElementsByTagName("tr")[0];
            if (!HeaderRow) {
                continue;
            }

            var Header = HeaderRow.getElementsByTagName( "th" )[0];
            if (!Header) {
                continue;
            }

            NavigationBoxes[tableIndex] = Tables[i];
            Tables[i].setAttribute("id", "collapsibleTable" + tableIndex);

            var Button = document.createElement("span");
            var ButtonLink = document.createElement("a");
            var ButtonText = document.createTextNode(collapseCaption);

            Button.className = "collapseButton";

            ButtonLink.style.color = "#FFFFFF";
            ButtonLink.setAttribute("id", "collapseButton" + tableIndex);
            ButtonLink.setAttribute("href", "javascript:collapseTable(" + tableIndex + ");");
            ButtonLink.appendChild(ButtonText);

            Button.appendChild(document.createTextNode("["));
            Button.appendChild(ButtonLink);
            Button.appendChild(document.createTextNode("]"));

            //Header.appendChild(Button);
            Header.insertBefore(Button, Header.childNodes[0]);
            tableIndex++;
        }
    }
    for (var i = 0; i < tableIndex; i++) {
        if (hasClass(NavigationBoxes[i], "collapsed") || (tableIndex >= autoCollapse && hasClass(NavigationBoxes[i], "autocollapse"))) {
            collapseTable(i);
        } 
        else if (hasClass(NavigationBoxes[i], "innercollapse")) {
            var element = NavigationBoxes[i];
            while (element = element.parentNode) {
                if (hasClass(element, "outercollapse")) {
                    collapseTable(i);
                    break;
                }
            }
        }
    }
}
addOnloadHook(createCollapseButtons);