Difference between revisions of "MediaWiki:Common.js"

Revision as of 11:25, 10 February 2010

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

/**
 * Determines 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);
    };
})();

/**
 * Determines if a given value is a number.
 */
function isNumeric(value) {
    var isNumeric = false;
    var numReg = new RegExp(/(^\d+$)|(^\d+\.\d+$)/);
    if (numReg.test(value)) {
        isNumeric = true;
    }
    return isNumeric;
}

/**
 * Removes all children from an element.
 */
function removeChildren(element) {
    while (element.hasChildNodes()) {
        element.removeChild(element.firstChild);
    }
}

/**
 * Code for collapsible tables.
 */
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 = getElementsByClassName(document, 'table', 'collapsible');

    for (var i = 0; i < tables.length; i++) {
        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 spacer = document.createElement('div');
        var button = document.createElement('span');
        var buttonLink = document.createElement('a');
        var buttonText = document.createTextNode(collapseCaption);

        spacer.style.cssFloat = 'left';
        spacer.style.styleFloat = 'left';
        spacer.style.textAlign = 'left';
        spacer.style.width = '35px';
        spacer.appendChild(document.createTextNode('\u00a0'));
        header.insertBefore(spacer, header.childNodes[0]);

        button.style.cssFloat = 'right';
        button.style.styleFloat = 'right';
        button.style.fontSize = '11px';
        button.style.fontWeight = 'normal';
        button.style.textAlign = 'right';
        button.style.width = '35px';

        buttonLink.style.color = '#FFFFFF';
        buttonLink.id = 'collapseButton' + tableIndex;
        buttonLink.href = 'javascript:collapseTable(' + tableIndex + ');';
        buttonLink.appendChild(buttonText);

        button.appendChild(document.createTextNode('['));
        button.appendChild(buttonLink);
        button.appendChild(document.createTextNode(']'));
        header.insertBefore(button, header.childNodes[0]);

        tableIndex++;
    }

    for (var i = 0; i < tableIndex; i++) {
        if (hasClass(navigationBoxes[i], 'collapsed') || (tableIndex >= 2 && 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);

/**
 * Calculator that calculates your percentage chance for more and better loot given a Luck value.
 */
function luckToChanceCalculator() {
    var calculator = document.getElementById('luckToChance');

    if (calculator) {
        var calcTable = document.createElement('table');
        var calcTableRow = calcTable.insertRow();

        var calcTableCell = calcTableRow.insertCell();
        calcTableCell.appendChild(document.createTextNode('Luck:'));

        calcTableCell = calcTableRow.insertCell();
        var luckInput = document.createElement('input');
        luckInput.id = 'luckInput';
        luckInput.maxLength = '4';
        luckInput.type = 'text';
        luckInput.style.width = '35px';
        calcTableCell.appendChild(luckInput);

        var percentChanceLabel = document.createElement('div');
        percentChanceLabel.appendChild(document.createTextNode('0.000% Chance'));
        percentChanceLabel.style.textAlign = 'right';
        percentChanceLabel.style.width = '115px';

        var calculateButton = document.createElement('input');
        calculateButton.type = 'button';
        calculateButton.value = 'Calculate >>';
        calculateButton.onclick = function() {
            if (luckInput.value) {
                if (isNumeric(luckInput.value)) {
                    var percentChance = Math.pow(luckInput.value, (5 / 9));
                    if (percentChance > 100) {
                        percentChance = 100;
                    }
                    percentChance = percentChance.toFixed(3);
                    removeChildren(percentChanceLabel);
                    percentChanceLabel.appendChild(document.createTextNode(percentChance + '% Chance'));
                }
            }
        };
        calcTableCell = calcTableRow.insertCell();
        calcTableCell.appendChild(calculateButton);
        calcTableCell = calcTableRow.insertCell();
        calcTableCell.appendChild(percentChanceLabel);

        calculator.appendChild(calcTable);
    }
}

addOnloadHook(luckToChanceCalculator);