goog.events.EventType.LOAD
event for each image loaded, with an Image
object as the target of
the event, normalized to have naturalHeight
and naturalWidth
attributes.
To use this class, run:
var imageLoader = new goog.net.ImageLoader(); goog.events.listen(imageLoader, goog.net.EventType.COMPLETE, function(e) { ... }); imageLoader.addImage("image_id", "http://path/to/image.gif"); imageLoader.start();The start() method must be called to start image loading. Images can be added and removed after loading has started, but only those images added before start() was called will be loaded until start() is called again. A goog.net.EventType.COMPLETE event will be dispatched only once all outstanding images have completed uploading.
goog.Disposable | |
goog.events.EventTarget | goog.Disposable |
goog.net.ImageLoader | goog.events.EventTarget |
opt_parent
: Element=
An optional parent element whose document object
should be used to load images.
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Adds an image to the image loader, and associates it with the given ID
string. If an image with that ID already exists, it is silently replaced.
When the image in question is loaded, the target of the LOAD event will be
an
Image object with id and src attributes based on
these arguments.
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No description.
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Creates an
Image object with the specified ID and source URL, and
listens for network events raised as the image is loaded.
Arguments:
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Handles net events (READY_STATE_CHANGE, LOAD, ABORT, and ERROR).
Arguments:
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Removes the image associated with the given ID string from the image loader.
If the image was previously loading, removes any listeners for its events
and dispatches a COMPLETE event if all remaining images have now completed.
Arguments:
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Starts loading all images in the image loader in parallel. Raises a LOAD
event each time an image finishes loading, and a COMPLETE event after all
images have finished loading.
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Use
#listen instead, when possible. Otherwise, use
goog.events.listen if you are passing Object
(instead of Function) as handler.
Adds an event listener to the event target. The same handler can only be
added once per the type. Even if you add the same handler multiple times
using the same type then it will only be called once when the event is
dispatched.
Arguments:
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Asserts that the event target instance is initialized properly.
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No description.
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Removes listeners from this object. Classes that extend EventTarget may
need to override this method in order to remove references to DOM Elements
and additional listeners.
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Returns the parent of this event target to use for bubbling.
Returns: goog.events.EventTarget
The parent EventTarget or null if
there is no parent.
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No description.
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Use
#unlisten instead, when possible. Otherwise, use
goog.events.unlisten if you are passing Object
(instead of Function) as handler.
Removes an event listener from the event target. The handler must be the
same object as the one added. If the handler has not been added then
nothing is done.
Arguments:
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Sets the parent of this event target to use for capture/bubble
mechanism.
Arguments:
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Sets the target to be used for
event.target when firing
event. Mainly used for testing. For example, see
goog.testing.events.mixinListenable .
Arguments:
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No description.
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No description.
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Invokes a callback function when this object is disposed. Callbacks are
invoked in the order in which they were added.
Arguments:
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Disposes of the object. If the object hasn't already been disposed of, calls
#disposeInternal . Classes that extend goog.Disposable should
override #disposeInternal in order to delete references to COM
objects, DOM nodes, and other disposable objects. Reentrant.
Returns: void
Nothing.
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Deletes or nulls out any references to COM objects, DOM nodes, or other
disposable objects. Classes that extend
goog.Disposable should
override this method.
Not reentrant. To avoid calling it twice, it must only be called from the
subclass' disposeInternal method. Everywhere else the public
dispose method must be used.
For example:
mypackage.MyClass = function() { mypackage.MyClass.base(this, 'constructor'); // Constructor logic specific to MyClass. ... }; goog.inherits(mypackage.MyClass, goog.Disposable); mypackage.MyClass.prototype.disposeInternal = function() { // Dispose logic specific to MyClass. ... // Call superclass's disposeInternal at the end of the subclass's, like // in C++, to avoid hard-to-catch issues. mypackage.MyClass.base(this, 'disposeInternal'); }; |
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Use
#isDisposed instead.
No description.
Returns: boolean
Whether the object has been disposed of.
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No description.
Returns: boolean
Whether the object has been disposed of.
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Associates a disposable object with this object so that they will be disposed
together.
Arguments:
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Event handler object, used to keep track of onload and onreadystatechange
listeners.
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Map of image IDs to their image element, used only for images that are in
the process of loading. Used to clean-up event listeners and to know
when we've completed loading images.
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Map of image IDs to their request including their image src, used to keep
track of the images to load. Once images have started loading, they're
removed from this map.
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The parent element whose document object will be used to load images.
Useful if you want to load the images from a window other than the current
window in order to control the Referer header sent when the image is
loaded.
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The object to use for event.target. Useful when mixing in an
EventTarget to another object.
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No description.
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Maps of event type to an array of listeners.
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Parent event target, used during event bubbling.
TODO(user): Change this to goog.events.Listenable. This
currently breaks people who expect getParentEventTarget to return
goog.events.EventTarget.
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An array of event types to listen to on images. This is browser dependent.
For IE 10 and below, Internet Explorer doesn't reliably raise LOAD events
on images, so we must use READY_STATE_CHANGE. Since the image is cached
locally, IE won't fire the LOAD event while the onreadystate event is fired
always. On the other hand, the ERROR event is always fired whenever the image
is not loaded successfully no matter whether it's cached or not.
In IE 11, onreadystatechange is removed and replaced with onload:
http://msdn.microsoft.com/en-us/library/ie/ms536957(v=vs.85).aspx
http://msdn.microsoft.com/en-us/library/ie/bg182625(v=vs.85).aspx
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Describes a request for an image. This includes its URL and its CORS-request
type, if any.
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No description.
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The type of image request to dispatch, if this is a CORS-enabled image
request. CORS-enabled images can be reused in canvas elements without them
being tainted. The server hosting the image should include the appropriate
CORS header.
Constants:
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