Offset first page in viewer.js LAYOUT_PRESENTATION_TWO_PAGE

page-offset-data-provider.js

Crocodoc.addDataProvider('page-offset', function (scope) {
    return {
        get: function (type, key) {
            var $p, dp = scope.getDataProvider(type);
            if (type === 'metadata') {
                $p = dp.get(type);
                return $p.then(function (data) {
                    data.numpages += 1;
                    var page,
                        exceptions = data.dimensions.exceptions,
                        newExceptions = {};
                    for (page in exceptions) {
                        newExceptions[parseInt(page, 10) + 1] = exceptions[page];
                    }
                    data.dimensions.exceptions = newExceptions;
                    return data;
                }).promise({
                    abort: $p.abort
                });
            } else if (type === 'page-svg' || type === 'page-text') {
                key -= 1;
                if (key === 0) {
                    return $.Deferred().resolve('').promise({
                        abort: function () {}
                    });
                }
                return dp.get(type, key);
            } else if (type === 'page-img') {
                key -= 1;
                if (key === 0) {
                    return $.Deferred().resolve(new Image()).promise({
                        abort: function () {}
                    });
                }
                return dp.get(type, key);
            }
        }
    };
});

page-offset-example.css

.crocodoc-page:first-child {
    visibility: hidden !important;
}

page-offset-example.js

var viewer = Crocodoc.createViewer('.container', {
    url: '...',
    dataProviders: {
        metadata: 'page-offset',
        'page-svg': 'page-offset',
        'page-text': 'page-offset',
        'page-img': 'page-offset'
    }
});