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When you click the Load button, the loadHandler lets you browse for the data file. In this example, the file is an XML file. private function loadHandler(event:MouseEvent):void { //Create a FileFilter to prevent the user from //opening any file type except XML files var fileFilter:FileFilter = new FileFilter("XML Documents", "*.xml;");
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//Allow the user to browse for the new file. //Pass the fileFilter as an argument _fileReference.browse([fileFilter]); //FileReference SELECT listener. This is fired when the //user selects the correct file _fileReference.addEventListener(Event.SELECT, selectHandler); } You can make sure that the user can open only a specific type of file by using a FileFilter object. In this example, the FileFilter prevents the user from opening any files except XML files. All other types of files will be dimmed in the file browser. var fileFilter:FileFilter = new FileFilter("XML Documents", "*.xml;"); The first argument, "XML Documents", is just a description. This description is displayed in the title bar of Windows and Linux file browsers. The second argument, "*.xml;", is the type of file you want to open. In this case, it s any file with an .xml extension. To allow the user to open more than one type of file, add more extension names and separate them with semicolons, like this: var fileFilter:FileFilter = new FileFilter ("Documents", "*.xml; *.doc; *.txt; *.pdf"); Of course, your AS3.0 code will need to be able to interpret any file you open. AS3.0 can read XML files natively, which is why they re used in this example. Next, the code calls the _fileReference object s browse method and passes the fileFilter as an argument. _fileReference.browse([fileFilter]); This is what launches the operating system s file browser and dims the names of all files except those with an .xml extension. The code then attaches a listener that calls the selectHandler when the file has been selected by the user in the file browser. _fileReference.addEventListener(Event.SELECT, selectHandler); The selectHandler does the job of loading the file into the SWF with FileReference s load method. It calls the loadCompleteHandler when it s finished. private function selectHandler(event:Event):void { //Remove this listener _fileReference.removeEventListener(Event.SELECT, selectHandler); //Add a listener to check whether the file has //successfully loaded _fileReference.addEventListener (Event.COMPLETE, loadCompleteHandler);
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//Load the file _fileReference.load(); } The loadCompleteHandler reads the loaded data, casts it as an XML object, and copies it into the text field so that the file data is visible on the stage private function loadCompleteHandler(event:Event):void { //Remove this listener _fileReference.removeEventListener (Event.COMPLETE, loadCompleteHandler); //Store the FileReference's data in the XML object var xmlData:XML = XML(_fileReference.data); //Display the XML object in the text field _textField.text = xmlData;
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} FileReference objects have a data property that contains the loaded data. The following directive reads the loaded data and interprets it as XML. _xmlData = XML(_fileReference.data); Finally, xmlData, the loaded XML file, is displayed in the text field on the stage. _textField.text = xmlData; This same technique works for images as well. In this chapter s source files, you ll find the LoadingImages folder. Run the SWF, and use the Load button to load any image file onto the stage. The code loads the images with the help of the Loader and LoaderInfo classes. Check the comments in the source code for more details.
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When the XML file is loaded into the text field, you can make any changes to it that you like. To allow editing directly in the text field, the text field s selectable property must be set to true, and its type needs to be set to INPUT. _textField.selectable = true; _textField.type = TextFieldType.INPUT; Once you ve made some changes, click the Save button. The Save button s listener calls the saveHandler. The saveHandler creates a new FileReference object that saves the data from the text field as an XML file. A file browser window prompts the user to choose a file name and the directory location to save the new file.
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