MediaWiki:Calculator.js/Luck.js

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/**
 * Calculator that calculates your percentage chance for more and better loot given a specified Luck value.
 */
function LuckToChanceCalculator() {
    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);

    return calcTableRow;
}

/**
 * Calculator that calculates the amount of Luck required to achieve a specified percentage chance for more and better loot.
 */
function ChanceToLuckCalculator() {
    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);

    return calcTableRow;
}

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

    for (var i in calculators) {
         if (calculators[i].id == 'LuckToChance') {
             Calculator(LuckToChanceCalculator(), 'LuckToChance', 'Luck to Chance', 4);
         } else if (calculators[i].id == 'ChanceToLuck') {
             Calculator(ChanceToLuckCalculator(), 'ChanceToLuck', 'Chance to Luck', 4);
         }
    }
}
addOnloadHook(searchForCalculators);