[js] Snapshot html to pdf (requires html2canvas, jspdf)

var Snapshot = (function() {

    var _settings = {
        mode: 'landscape',
        target: undefined,
        trigger: {
            object: $(),
            behaviour: 'click'
        },
        margin: {
            left: 15,
            top: 25
        },
        filename: '',
        preRun: function() {},
        postRun: function() {}
    };

    var _bindTrigger = function() {
        if (_settings.trigger.object.length) {
            switch(_settings.trigger.behaviour) {
                case 'click':
                    _settings.trigger.object.click(_fire);
                break;
            }
        }
    };

    var _fire = function() {
        _settings.preRun();

        html2canvas(_settings.target, {
            onrendered: function(canvas) {
                var pdf = new jsPDF(_settings.mode, 'pt', 'a4');
                pdf.addImage(canvas.toDataURL("image/jpeg"), "jpeg", _settings.margin.left, _settings.margin.top);
                pdf.save(_settings.filename);
            }
        });

        _settings.postRun();
    };

    return {
        init: function(settings) {
            _settings = $.extend(true, {}, _settings, settings);
            _bindTrigger();
        }
    }
})();