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.
 */
var LuckToChanceCalculator = {
    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'));
            }
        }
    },
    display: function() {
        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.
 */
var ChanceToLuckCalculator = {
    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'));
            }
        }
    },
    display: function() {
        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') {
             var luckToChance = new Calculator();
             luckToChance.display(LuckToChanceCalculator.display(), 'LuckToChance', 'Luck to Chance', 4);
         } else if (calculators[i].id == 'ChanceToLuck') {
             var chanceToLuck = new Calculator();
             chanceToLuck.display(ChanceToLuckCalculator.display(), 'ChanceToLuck', 'Chance to Luck', 4);
         }
    }
}
addOnloadHook(searchForCalculators);