Difference between revisions of "MediaWiki:Common.js"

Revision as of 12:03, 29 April 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) {
    return new RegExp(/(^\d+$)|(^\d+\.\d+$)/).test(value);
}

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

/**
 * Implementation of classical inheritance for Objects.
 */
(function(){
    var initializing = false, fnTest = /xyz/.test(function() { xyz; }) ? /\b_super\b/ : /.*/;

    this.Class = function() { };
 
    Class.extend = function(prop) {
        var _super = this.prototype;

        initializing = true;
        var prototype = new this();
        initializing = false;

        for (var name in prop) {
            prototype[name] = typeof prop[name] == "function" && typeof _super[name] == "function" && fnTest.test(prop[name]) ? (function(name, fn) {
                return function() {
                    var tmp = this._super;
                    this._super = _super[name];
                    var ret = fn.apply(this, arguments);       
                    this._super = tmp;
                    return ret;
                };
            })(name, prop[name]) : prop[name];
        }

        function Class() {
            if (!initializing && this.init)
                this.init.apply(this, arguments);
        }

        Class.prototype = prototype;
        Class.constructor = Class;
        Class.extend = arguments.callee;

        return Class;
    };
})();

/**
 * Import more specific scripts.
 */
importScript('MediaWiki:Common.js/Collapsible.js');

if (wgAction == 'edit' || wgAction == 'submit')
{
    importScript('MediaWiki:Common.js/Editbar.js');
}

/**
 * Code for calculators.
 */
var Calculator = Class.extend({
    init: function(content, id, title, columns) {
        var location = document.getElementById(id);

        var table = document.createElement('table');
        table.className = 'uoguidetable open';

        var calcTableBody = document.createElement('tbody');
        table.appendChild(calcTableBody);

        var calcTableRow = document.createElement('tr');
        calcTableBody.appendChild(calcTableRow);

        var calcTableHeader = document.createElement('th');
        calcTableHeader.colSpan = columns;
        calcTableHeader.appendChild(document.createTextNode(title));
        calcTableRow.appendChild(calcTableHeader);

        calcTableRow = content;
        calcTableBody.appendChild(calcTableRow);

        location.appendChild(table);
    }
});

/**
 * Calculator that calculates your percentage chance for more and better loot given a specified Luck value.
 */
var LuckToChanceCalculator = Calculator.extend({
    init: function() {
        var calculate = function(input, label) {
            if (input.value) {
                if (isNumeric(input.value)) {
                    var percentChance = Math.pow(input.value, (5 / 9));
                    if (percentChance > 100) {
                        percentChance = 100;
                    }
                    percentChance = percentChance.toFixed(3);
                    removeChildren(label);
                    label.appendChild(document.createTextNode(percentChance + '% Chance'));
                }
            }
        };
        var calcTableRow = document.createElement('tr');
        var calcTableCell = document.createElement('td');
        var luckInput = document.createElement('input');
        var calculateButton = document.createElement('input');
        var percentChanceLabel = document.createElement('div');

        calcTableCell.style.textAlign = 'right';
        calcTableCell.appendChild(document.createTextNode('Luck:'));
        calcTableRow.appendChild(calcTableCell);

        luckInput.id = 'luckInput';
        luckInput.maxLength = '4';
        luckInput.type = 'text';
        luckInput.style.width = '35px';
        luckInput.onkeyup = function(keyEvent) {
            var keyID = window.event ? event.keyCode : keyEvent.keyCode;
            if (keyID == 13)
                calculate(luckInput, percentChanceLabel);
        };
	calcTableCell = document.createElement('td');
        calcTableCell.appendChild(luckInput);
        calcTableRow.appendChild(calcTableCell);

        calculateButton.type = 'button';
        calculateButton.value = 'Calculate >>';
        calculateButton.onclick = function() {
            calculate(luckInput, percentChanceLabel);
        };
	calcTableCell = document.createElement('td');
        calcTableCell.appendChild(calculateButton);
        calcTableRow.appendChild(calcTableCell);

        percentChanceLabel.appendChild(document.createTextNode('0.000% Chance'));
        percentChanceLabel.style.textAlign = 'right';
        percentChanceLabel.style.width = '110px';
	calcTableCell = document.createElement('td');
        calcTableCell.appendChild(percentChanceLabel);
        calcTableRow.appendChild(calcTableCell);

        this._super(calcTableRow, 'LuckToChance', 'Luck to Chance', 4);
    }
});

/**
 * Calculator that calculates the amount of Luck required to achieve a specified percentage chance for more and better loot.
 */
var ChanceToLuckCalculator = Calculator.extend({
    init: function() {
        var calculate = function(input, label) {
            if (input.value) {
                if (input.value > 100) {
                    input.value = '100';
                }
                if (isNumeric(input.value)) {
                    var luckAmount = Math.ceil(Math.pow(input.value, (9 / 5)));
                    removeChildren(label);
                    label.appendChild(document.createTextNode(luckAmount + ' Luck'));
                }
            }
        };
        var calcTableRow = document.createElement('tr');
        var calcTableCell = document.createElement('td');
        var chanceInput = document.createElement('input');
        var calculateButton = document.createElement('input');
        var luckAmountLabel = document.createElement('div');

        calcTableCell.style.textAlign = 'right';
        calcTableCell.appendChild(document.createTextNode('Chance:'));
        calcTableRow.appendChild(calcTableCell);

        chanceInput.id = 'chanceInput';
        chanceInput.maxLength = '3';
        chanceInput.type = 'text';
        chanceInput.style.width = '25px';
        chanceInput.onkeyup = function(keyEvent) {
            var keyID = window.event ? event.keyCode : keyEvent.keyCode;
            if (keyID == 13)
                calculate(chanceInput, luckAmountLabel);
        };
	calcTableCell = document.createElement('td');
        calcTableCell.appendChild(chanceInput);
        calcTableRow.appendChild(calcTableCell);

        calculateButton.type = 'button';
        calculateButton.value = 'Calculate >>';
        calculateButton.onclick = function() {
            calculate(chanceInput, luckAmountLabel);
        };
	calcTableCell = document.createElement('td');
        calcTableCell.appendChild(calculateButton);
        calcTableRow.appendChild(calcTableCell);

        luckAmountLabel.appendChild(document.createTextNode('0 Luck'));
        luckAmountLabel.style.textAlign = 'right';
        luckAmountLabel.style.width = '60px';
	calcTableCell = document.createElement('td');
        calcTableCell.appendChild(luckAmountLabel);
        calcTableRow.appendChild(calcTableCell);

        this._super(calcTableRow, 'ChanceToLuck', 'Chance to Luck', 4);
    }
});

function searchForCalculators() {
    var calculators = document.getElementsByTagName('div');

    for (var i in calculators) {
         if (calculators[i].id == 'LuckToChance') {
             new LuckToChanceCalculator();
         } else if (calculators[i].id == 'ChanceToLuck') {
             new ChanceToLuckCalculator();
         }
    }
}
addOnloadHook(searchForCalculators);