handlebars.js misc helpers

gistfile1.js

Handlebars.registerHelper({
    // usage: {{inc @index}}
    inc: function(value)
    {
        return parseInt(value) + 1;
    },
    // usage: {{#if_eq a b}} or {{^if_eq a b}} for not equal
    if_eq: function(a, b, c, options)
    {
        if (typeof(c) === "object")
            options = c;

        if (a === b || a === c)
            return options.fn(this);
        else
            return options.inverse(this);
    },
    // usage: {{math "add" a b}}, {{math "sub" a b}}
    math: function (op, a, b)
    {
        var result;

        try {
            a = a.replace(',', '');
            b = b.replace(',', '');
        } catch (e) {
            // intentionally do nothing
        }

        if (op === "add")
            result = parseFloat(parseFloat(a) + parseFloat(b)).toFixed(2);
        else if (op === "sub")
            result = parseFloat(parseFloat(a) - parseFloat(b)).toFixed(2);
        else if (op === "div")
            result = parseFloat(parseFloat(a) / parseFloat(b)).toFixed(2);

        return result;
    }
});