how to create barcode in vb net 2012 How Events Flow Through a Document in Java

Creation Data Matrix ECC200 in Java How Events Flow Through a Document

How Events Flow Through a Document
Making Data Matrix 2d Barcode In Java
Using Barcode creator for Java Control to generate, create Data Matrix image in Java applications.
Recognizing DataMatrix In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
The term event flow is used to describe the process by which an event originates in a particular implementation of the DOM and travels through the document Using the DOM methods, events can be handled in different ways: either locally at the element where the event originates, or higher up in the document tree at one of the element s ancestors Every event has an associated event target This target is usually a particular node in the document at which the event originates In addition, each event target may have one or more event listeners, which are triggered when an event is fired for the target Figure 5-3 illustrates how an incoming event is processed by a target s event listeners There are two directions in which an event may flow in the document tree: up or down The direction in which an event flows is dictated by what type of event listeners are registered for a given event An event listener may designate itself as using event capture, in which case it will be the recipient of events before any of its descendants This is how an event can flow downward in the document tree Some types of events trigger listeners on their targets and then move upward through the
Bar Code Encoder In Java
Using Barcode printer for Java Control to generate, create barcode image in Java applications.
Barcode Scanner In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Figure 5-3
Painting Data Matrix ECC200 In Visual C#.NET
Using Barcode generator for VS .NET Control to generate, create DataMatrix image in VS .NET applications.
Generate Data Matrix ECC200 In Visual Studio .NET
Using Barcode printer for ASP.NET Control to generate, create ECC200 image in ASP.NET applications.
An event triggering an event target s listeners
Drawing Data Matrix In Visual Studio .NET
Using Barcode encoder for VS .NET Control to generate, create Data Matrix ECC200 image in Visual Studio .NET applications.
Draw ECC200 In Visual Basic .NET
Using Barcode generator for VS .NET Control to generate, create Data Matrix 2d barcode image in VS .NET applications.
The Document Object Model: Processing Structured Documents
2D Barcode Creation In Java
Using Barcode encoder for Java Control to generate, create 2D Barcode image in Java applications.
Make Bar Code In Java
Using Barcode creator for Java Control to generate, create bar code image in Java applications.
The EventTarget and EventListener Interfaces
Print Barcode In Java
Using Barcode creation for Java Control to generate, create bar code image in Java applications.
GTIN - 13 Generation In Java
Using Barcode printer for Java Control to generate, create UPC - 13 image in Java applications.
The DOM Level 2 EventTarget interface has the following IDL definition:
Painting UPC-E Supplement 2 In Java
Using Barcode encoder for Java Control to generate, create UPC-E Supplement 2 image in Java applications.
Scanning Code 128 Code Set B In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
interface EventTarget { void addEventListener(in DOMString type, in EventListener listener, in boolean useCapture); void removeEventListener(in DOMString type, in EventListener listener, in boolean useCapture); boolean dispatchEvent(in Event evt) raises(EventException); };
ECC200 Generation In None
Using Barcode creation for Online Control to generate, create Data Matrix 2d barcode image in Online applications.
Read UPC - 13 In VB.NET
Using Barcode recognizer for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
Figure 5-4
Barcode Encoder In Java
Using Barcode creation for Android Control to generate, create bar code image in Android applications.
Bar Code Generator In None
Using Barcode drawer for Excel Control to generate, create barcode image in Office Excel applications.
Event flow in a document tree
Printing Code 39 Full ASCII In C#
Using Barcode printer for VS .NET Control to generate, create USS Code 39 image in VS .NET applications.
Code 39 Creator In Objective-C
Using Barcode encoder for iPhone Control to generate, create Code 3/9 image in iPhone applications.
AM FL Y
document tree to each successive parent target These types of events are called bubbling events because they bubble upward through the document like bubbles of air in water Figure 5-4 illustrates these two different directions of event flow in a sample document tree Suppose that node D was clicked by the user, and that nodes A, B, and D each have two event listeners for the click: one using event capture and one not using capture Node A will receive the first event and trigger its capture-based event listener (point 1 in the figure) Next, node B will trigger its capture-based event listener (point 2) Finally, node D will trigger its event listener (point 3) At this point, the event will bubble back up through the document tree, triggering event listeners on nodes that are not using event capture first on node D (point 4), then on node B (point 5), and finally back up to node A (point 6)
5: Browsers
The addEventListener() method attaches an EventListener (discussed shortly) to a particular event target (usually a node in the document) The type argument specifies the type of event that the listener handles (see the DOM2 Events module specification for a list of event types) The listener argument is the particular EventListener that will handle the events In the JavaScript DOM implementation, this is a function that takes a single argument (an Event object) The useCapture argument specifies whether this listener should use event capture when listening for events If it is true, the event target for this listener will receive events of the type for which it is registered before any of its descendants in the document tree If a listener is added while an event target is already processing an event, it will not be triggered by the current event Adding identical event listeners will cause the duplicate listener to be discarded
NOTE
A node that has an event handler registered for an event using capture and another event handler that is not using capture for the same event is considered to have two separate handlers, even though they are for the same event
The removeListener() method removes a listener from an event target Note that in order to remove a listener, you must provide the type, listener, and useCapture arguments that were all used when the listener was registered This is because the type alone is not enough to uniquely identify the listener Listeners can be registered for the same event type but with different settings for useCapture, and each listener is considered to be separate and distinct The dispatchEvent() method allows a DOM application to manually dispatch events into the event model These manually dispatched events will have the same types of bubbling and/or capture behavior as events that are generated normally by the implementation The EventListener interface is specified as
interface EventListener { void handleEvent(in Event evt); };
The EventListener interface has just one method, handleEvent(), which takes an Event as its only parameter You ll see how the methods of the EventTarget and EventListener interfaces are actually used later in the section First, there s a bit more theory to cover
Copyright © OnBarcode.com . All rights reserved.