setObjectText

// sets text content for an object. Depends on object's type the content and/or text formatitng are set differently:
        //  - for Address the formatting is applied on line-by-line basis using <LineFonts> list
        //  - for text the formatting of current first character is used for the whole text
        //  - for Barcode object it is barcode string
        //  - for Image it is base64-encoded string of image's png stream
        //  - for CircularText it is object's text
        //  - for DateTime and Counter object it is object's PreText
        //  - for other objects an empty string is returned
        // Parameters:
        //      objectName - object name
        //      text - plain text string for new object content
        function setObjectText(objectName, text)
        {
            //var objectElem = _getObjectByNameElement(objectName);
            //var objectType = objectElem.tagName;

            var objectElements = _getObjectsByNameElement(objectName);

            for (element in objectElements) {
                var objectType = objectElements[element].tagName;

                switch (objectType)
                {
                    case "AddressObject":
                        _setAddressObjectText(objectElements[element], text);
                        break;

                    case "TextObject":
                        //get <StyledText>
                        var styledTextElem = Xml.getNode(objectElements[element], "StyledText");
                        var firstElem = Xml.getNode(styledTextElem, "Element");
                        if (firstElem)
                        {
                            // remove all other children
                            Xml.removeAllChildren(styledTextElem);

                            // replace string with supplied text
                            Xml.setElementText(Xml.getNode(firstElem, "String"), text);

                            //readd first elem with updated string
                            styledTextElem.appendChild(firstElem);
                        }
                        else
                        {
                            // the StyledText is empty - simple add <Element> with default font info
                            var defaultElem = '<Element><String>' + text + '</String>\
                        <Attributes>\
                            <Font Family="Arial" Size="12" Bold="False" Italic="False" Underline="False" Strikeout="False" />\
                            <ForeColor Alpha="255" Red="0" Green="0" Blue="0" />\
                        </Attributes></Element>';

                            var d = Xml.parse(defaultElem);
                            styledTextElem.appendChild(d.documentElement.cloneNode(true));
                        }
                        break;

                    case "BarcodeObject":
                        Xml.setElementText(Xml.getNode(objectElements[element], "Text"), text);
                        break;

                    case "ImageObject":
                        // if image is embedded return it (base64 png stream)
                        var imageElem = Xml.getNode(objectElements[element], "Image", null);
                        if (imageElem)
                            Xml.setElementText(imageElem, text);
                        else
                        {
                            // if there is no <Image> tag then there should be <ImageLocation>
                            // so replace <ImageLocation> with <Image>
                            var imageLocationElem = Xml.getNode(objectElements[element], "ImageLocation", null);
                            if (!imageLocationElem)
                                throw new Error("setObjectText(): <ImageLocation> is expected but not found: " + Xml.serialize(imageElem));

                            // create <Image> elem
                            imageElem = imageLocationElem.ownerDocument.createElement("Image");
                            Xml.setElementText(imageElem, text);
                            objectElements[element].replaceChild(imageElem, imageLocationElem);
                        }
                        break;

                    case "CircularTextObject":
                        Xml.setElementText(Xml.getNode(objectElements[element], "Text", null), text);
                        break;

                    case "DateTimeObject":
                        Xml.setElementText(Xml.getNode(objectElements[element], "PreText", null), text);
                        break;

                    case "CounterObject":
                        Xml.setElementText(Xml.getNode(objectElements[element], "PreText", null), text);
                        break;
                }
            }

            return ""; // default
        };