JavaScript Extension class for exporting a selection in Illustrator as SVG.

SelectionExporter.js

/*
 * Usage : 
 *
 *    new SelectionExporter(
 *        app.activeDocument.selection[0], 
 *        '/tmp/somefolder/tempfile.ai', 
 *        'My File'
 *    );
 */

(function (global) {

    /**
     * FileListError class.
     * @param message
     * @constructor
     */
    var SelectionExporterError = function(message) {
        this.name    = "SelectionExporterError";
        this.message = message || "Unknown SelectionExporterError";
    };
    SelectionExporterError.prototype = Error.prototype;

    /**
     * @param {PageItem}    selection       The PageItem (or derivative) in the form doc.selection[0].
     * @param {string}      tmpFilePath     Path to where to save the file.
     * @param {string}      name            The name of the PageItem.
     * @constructor
     * 
     * Usage:
     * 
     *      new SelectionExporter(
     *          app.activeDocument.selection[0],
     *          '/tmp/file/path.ai',
     *          'My Page Item'
     *      );
     */
    var Instance = function(selection, tmpFilePath, name) {

        this.sourceDoc     = null;
        this.exportDoc     = null;
        this.itemName      = name;
        this.tmpFilePath   = tmpFilePath;

        var module = this;

        userInteractionLevel = UserInteractionLevel.DONTDISPLAYALERTS;

        try {
            if (selection) {
                // *********************************************************

                var item;

                this.sourceDoc    = app.activeDocument;
                this.exportDoc    = app.documents.add( DocumentColorSpace.RGB );

                app.activeDocument = module.sourceDoc;

                try {

                    item = selection;
                    item.name = module.itemName;

                    module.exportItem(item);

                    // redraw();
                }
                catch(e) { throw new SelectionExporterError(e); }

                // *********************************************************

            }
            else{
                throw new Error('There are no documents open. Open a document and try again.');
            }
        }
        catch(e) {
            throw new SelectionExporterError(e);
        }
    }

    /**
     * Exports the selection item.
     * @param item
     */
    Instance.prototype.exportItem = function(item) {
        try {
            var newItem,
                module = this;

            newItem            = item.duplicate( module.exportDoc, ElementPlacement.PLACEATEND );
            newItem.hidden     = false;
            newItem.name       = item.name;
            app.activeDocument = module.exportDoc;

            redraw();

            module.exportSVG(
                module.exportDoc,
                item.name,
                item.visibleBounds
            );
        }
        catch(e) { throw new SelectionExporterError(e); }
    }

    /**
     * Export SVG.
     * @param doc
     * @param name
     * @param bounds
     */
    Instance.prototype.exportSVG = function(doc, name, bounds) {
        try {
            var module = this;

            doc.artboards[0].artboardRect = bounds;

            doc.exportFile(
                new File( module.tmpFilePath ),
                ExportType.SVG,
                module.getExportOptions()
            );

            doc.close(SaveOptions.DONOTSAVECHANGES);
        }
        catch(e) { throw new SelectionExporterError(e); }
    }

    /**
     * Get export options.
     */
    Instance.prototype.getExportOptions = function() {
        try {
            svgOptions = new ExportOptionsSVG();
            svgOptions.embedRasterImages   = false;
            svgOptions.cssProperties       = SVGCSSPropertyLocation.PRESENTATIONATTRIBUTES;
            svgOptions.fontSubsetting      = SVGFontSubsetting.None;
            svgOptions.documentEncoding    = SVGDocumentEncoding.UTF8;
            svgOptions.coordinatePrecision = 4;
            return svgOptions;
        }
        catch(e) { throw new SelectionExporterError(e); }
    }

    global.SelectionExporter = Instance;

})(this);