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You ll sometimes want to be notified when tree selection changes have been made, and by creating an instance of TreeSelectionListener and registering it with the JTree, you can receive such notification. This interface defines a single valueChanged() method that s called when the selection state of one or more nodes has changed. In other words, registered listeners are notified when unselected nodes become selected, as well as when selected nodes become unselected. For example, to create a listener using an anonymous inner class, you could write code similar to this: import javax.swing.event.*; // ... JTree myTree = new JTree(); myTree.addTreeSelectionListener(new TreeSelectionListener() { public void valueChanged(TreeSelectionEvent event) { // Add code here to handle selection changes } });

Listing 3-25. Code sample for child frame using the onmessage event <html> <head> <title>Cross Frame Messaging with postMessage (Receiver)</title> </head> <body> <h3>Remote Page (www.ie-examples.com)</h3> Message Origin (e.origin): <span id="receivedDataOrigin"></span><br> Message Contents (e.data): <span id="receivedDataContents"></span><br> Message Type (e.type): <span id="receivedDataType"></span><br> <script type="text/javascript"> // Point the onmessage event callback to receiveData, either by // using addEventListener or attachEvent if(window.addEventListener) window.addEventListener("message", receiveData, false); else window.attachEvent("onmessage", receiveData); // Grab messages from the parent through this callback/event e function receiveData(e) { // Make sure that the origin server is examples.proiedev.com if (e.data != "" && e.origin == "http://examples.proiedev.com") { // Write message data to the webpage setText(document.getElementById("receivedDataOrigin"), e.origin); setText(document.getElementById("receivedDataContents"), e.data); setText(document.getElementById("receivedDataType"), e.type); } } // Set element text (cross-browser innerText/textContent) function setText(element, text) { /*...*/ } </script> </body> </html> Figure 3-18 shows the pages described in the prior two code samples. The parent document, located at examples.proiedev.com, hosts an <iframe> that loads a page from www.ie-examples.com.

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DataTable dt1 = GetDataTable(students); DataTable newTable = dt1.AsEnumerable().CopyToDataTable(); There is little new so far. We created what will be our source DataTable from the students array. We created our destination DataTable by calling the CopyToDataTable operator on the source DataTable. Notice that because we called the first prototype of the CopyToDataTable operator, we do not need to call the AcceptChanges method on the destination DataTable. This is important because, in the next segment of code, we reference the original version of the Name field. If it were not for the fact that the first prototype of the CopyToDataTable operator establishes the original versions of fields for you, an exception will be thrown since the original version would not exist. Console.WriteLine("Before upserting DataTable:"); foreach (DataRow dataRow in newTable.AsEnumerable()) { Console.WriteLine("Student Id = {0} : original {1} : current {2}", dataRow.Field<int>("Id"), dataRow.Field<string>("Name", DataRowVersion.Original), dataRow.Field<string>("Name", DataRowVersion.Current)); } There is nothing of significance here except that we reference the original version of the Name field in the record, and no exception is thrown when doing so because this prototype of the CopyToDataTable operator established the original version for me. (from s in dt1.AsEnumerable() where s.Field<string>("Name") == "Anthony Adams" select s).Single<DataRow>().SetField("Name", "George Oscar Bluth"); dt1.AsEnumerable().CopyToDataTable(newTable, LoadOption.Upsert); This is the important segment of this example. Notice that we change the value of the Name field for one of the records in the source DataTable using the SetField<T> operator. Next, we call the CopyToDataTable operator specifying that a LoadOption.Upsert type of copy should occur, meaning update only the current version. This causes a problem, though, in that since we have called the second CopyToDataTable operator prototype, which doesn t establish original versions for records inserted into the database and we haven t called the AcceptChanges method, if we attempt to access the original

As the previous code segment illustrates, the valueChanged() method defined in TreeSelectionListener is passed an instance of TreeSelectionEvent. You can use the following methods in TreeSelectionEvent to obtain information that describes the type of selection change that occurred and to determine which nodes were involved in the change.

versions on inserted records, an exception will be thrown We will have to use the HasVersion method to prevent this from happening if any records are inserted Since we have not specified any primary keys, we know that all the records in the source table will be inserted into the destination table ConsoleWriteLine("{0}After upserting DataTable:", SystemEnvironmentNewLine); foreach (DataRow dataRow in newTableAsEnumerable()) { ConsoleWriteLine("Student Id = {0} : original {1} : current {2}", dataRowField<int>("Id"), dataRowHasVersion(DataRowVersionOriginal) dataRowField<string>("Name", DataRowVersionOriginal) : "-does not exist-", dataRowField<string>("Name", DataRowVersionCurrent)); } In this code segment, we merely display the DataTable content to the console.

Figure 3-18. Sample page demonstrating Cross-Document Messaging with postMessage A The parent calls postMessage() method to send a message (the contents of an <input> box) to the child frame when the Post Message <input> is clicked. The child frame receives notification of the message from the onmessage event, and promptly displays that message to the user.

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