A Large Number Formatter

largeNumberFormatter.js

var formatLargeNumbers = function (maxNumberToDisplay, maxPlaces, forcePlaces, forceLetter, forceToolTip) {

    $(document).ready(function () {
        applyFormatting();
    });

    function applyFormatting() {
        $(".large-number-format").each(function() {
            var number = $(this).html();

            if (number && !isNaN(number) && number > maxNumberToDisplay) {
                $(this).html(largeNumberFormatter(number));
            }

            if (forceToolTip) {
                $(this).tooltip({
                    track: true,
                    position: { my: "bottom", at: "bottom" }
                });
                $(this).title = number;
                $(this).attr("data-original-title", number);
            }
        });
    }

    function largeNumberFormatter(number) {
        number = Number(number);
        forceLetter = forceLetter || false;
        if (forceLetter !== false) {
            return annotate(number);
        }
        var abbr;
        if (number >= 1e12) {
            abbr = 'T';
        } else if (number >= 1e9) {
            abbr = 'B';
        } else if (number >= 1e6) {
            abbr = 'M';
        } else if (number >= 1e3) {
            abbr = 'K';
        } else {
            abbr = '';
        }
        return annotate(number, abbr);
    }

    function annotate(number, abbr) {
        // set places to false to not round
        var rounded = 0;
        switch (abbr) {
        case 'T':
            rounded = number / 1e12;
            break;
        case 'B':
            rounded = number / 1e9;
            break;
        case 'M':
            rounded = number / 1e6;
            break;
        case 'K':
            rounded = number / 1e3;
            break;
        case '':
            rounded = number;
            break;
        }
        if (maxPlaces !== false) {
            var test = new RegExp('\\.\\d{' + (maxPlaces + 1) + ',}$');
            if (test.test(('' + rounded))) {
                rounded = rounded.toFixed(maxPlaces);
            }
        }
        if (forcePlaces !== false) {
            rounded = Number(rounded).toFixed(forcePlaces);
        }
        return rounded + abbr;
    }
};