Flex :: Event Handler Execution Order?
Jun 23, 2009
I have been trying to understand the way ActionScript's events are implemented, but I'm stuck.I know that AS is single threaded, which means that only one event handler will be executing at a time, and also means that handlers will be executed in a deterministic order*.For example, consider the following code:
1: var x = {executed: false};
2: foo.addEventListener("execute", function(){ x.executed = true; });
3: foo.dispatchEvent(new Event("execute"));
[code].....
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Aug 27, 2009
Scenario: I have a simple external class with one function that takes about 2sec to execute. It gets some data and put it into a global variable (using a special class for this). From the first frame on the timeline I call this function, and then right after I trace the global variable.
Problem: The trace is actually executed before the function in the external class has finished executing, so the output of the trace is undefined.
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Nov 15, 2009
I have a chicken walking on the screen. The legs are separate movieclips nested. After a while I had the chicken walking rightwards, with hittest(there must be a better way) at the end of the stage he turned to the left and then again to the right after hitting the left barrier. I also got his right leg going up and down for a smoother walk. I did this with Tweener. But then the problems started. I didn't get the left leg also to move up and down.
The chicken got more and more crazy. And now he starts walking backwarsds instead of to the right, as I intended to, after publishing. Who has a better idea of letting this chicken walk or a good hint for functions to be executed when I want? Tweener is good, but maybe not for this? The chicken doesn't have to respond to a mouse action (maybe later), this is the code, for which the walking to the left apparently seems to be executed first....
ActionScript Code:
function walking() {
Tweener.addTween (kip, {x:kip.x+60,
time:1,
transition:"easeInOutQuint",
onComplete:walkingright});
//onStart:walkingrightstart});
The collission with hittest is also not really smooth but I can't think of something else. I am at a stage where I can't develop 3D moving.
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Aug 16, 2006
Ok, a simple situation: say I have five fairly complicated functions on one frame. I define all my functions, what they do, etc. After all that, I call all five functions in a row like
functionOne();
functionTwo();
functionThree();
[code].....
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Aug 30, 2010
I have an external as3 file for my timeline. I'm trying to download data from an xml file when a button is clicked. First, I have an xml loader. When it's finished loading, I assign the data to an xml variable. The trouble is, when I start this code from the onclick event, the code executes the xml loader, then the trace from onclick, then the assignment of the xml variable! So my data is always null! When I load the data from the constructor class, all is well. How can I make the execution take place in the proper order?
[Code]...
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Feb 17, 2010
I have created an image gallery where each "slide" is an image loaded by one UILoader component. Everything works, except I noticed that as a user it is annoying to wait for each new slide to load.So, even with my limited knowledge of AS3, I decided to figure out a way to load the next upcoming image before the user requests itone for odd numbered slides, one for even numbered slides. That way, when the user is viewing a slide with an odd number in the first loader, the next image can be loaded into the second (currently invisible) loader and ready to go when requested button would simply toggle the visibility of these two loaders.
function nextButton(event:MouseEvent):void
{
imageNumber++;
[code].....
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Jan 20, 2010
I want to extend my function to a better design to where I can pass a canvas object into so I don't have to write N functions.. I'm not sure as how to do this properly I've come up with a naive design with a switch but even then if I add another canvas I still need to write new code for the new canvas.
function fadeCanvasOut(event:TimerEvent):void
{
canvas1.alpha -= 0.1;
[code].....
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Jan 16, 2012
I'm loading some images from a database using a PHP script through CodeIgniter, but when I try to add an event handler to do some stuff with these images, Flex compiler is showing me an error:1180: Call to a possibly undefined method cloneCar.Why I can not add an event handler in this context?
<mx:Accordion>
<mx:Form id="menu5" label="Prueba" width="100%" height="100%" backgroundColor="#707070" icon="{roadIcon}">
[code].....
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Aug 4, 2010
I have an issue in handling the F5(Refresh) option in IE8 using FLEX. As i got some code by surfing..which is as follows
public function handleKeyDown(event:KeyboardEvent) :void
{
display.text = "Key was pressed: " + event.keyCode;
}
]]>
The main intention of the code is to handle F5(refresh) event. It works fine in Mozilla, GoogleChrome but not in IE8. When i execute the code in IE8 before the event handle by the FLEX the browser is handling the event.
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May 20, 2011
How do I access timer.running from inside event handler?
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Mar 15, 2010
add a click event handler to the vertical axis (or any axis) of a barchart in flex? If I add the handler to the BarChart itself, it looks as though the event doesn't fire unless you click on the actual chart, not the axes.
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Mar 11, 2011
I have the following codes,
for (i=0; i<answerArray.length; i++) {
var myOptionButton1:spark.components.RadioButton = new spark.components.RadioButton();
myOptionButton1.label = answerArray.getItemAt(i).Answer_Choice;
[code].....
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Oct 20, 2011
Create a tab navigator (or viewstack, whatever) and add a couple tabs. On your tab add a show event handler. Inside the event handler call invalidateProperties() and invalidateDisplayList() on one of the children of your tab. Put a break point on the childs commitProperties() and updateDisplayList(). You'll notice that the updateDisplayList() gets called before commitProperties() which results in incorrect behaviour.
I noticed this problem when setting a DataGrid's dataprovider from inside the show handler. Setting the dataProvider causes the grid to invalidate both properties and displayList, updateDisplayList() will get called first, then commitProperties() which will result in the grid not updating the rows. It appears the root of the problem is that the show event gets dispatched from within LayoutManagers validateDisplayList() loop, so invalidating a child object from within the show handler results in its updateDisplayList() getting called immediately.
[Code]....
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Aug 13, 2009
I am querying a 3rd party web service and not all the data seems to be making it to the event handler. When I view the request/response in the Network Monitor I see a collection of data objects each containing two string variables (name, url) and two arrays (counts, breakdown). When the result handler receives the data and I view it in debug mode, the collection of data objects each only contains one string variable (name). What happened to the other string var (url) and both arrays (counts, breakdown)? what would cause this since it seems to becoming corrupt before it reaches the event handler but after it is received by the network? Is this most likely an IDE issue?
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Jul 21, 2010
I need to call FileReference.save() after a web service call has completed, but this method has a restriction: "In Flash Player, you can only call this method successfully in response to a user event (for example, in an event handler for a mouse click or keypress event). Otherwise, calling this method results in Flash Player throwing an Error exception." (from the documentation here)
This restriction is a bit vague. Does it mean that I can only call the FileReference.save() method from within an event handler function that is registered as a listener for certain types of user events? If so then exactly which user events are valid? (Perhaps there's an event that will never be dispatched by user interaction with my application and I could register an event handler function for that event type and make the save() call from within that function?)
My difficulty is that I can't safely call the FileReference.save() method until my web service returns with the data that will be used as the argument of the FileReference.save() method call, so the event that triggers the FileReference.save() call is actually a ResultEvent rather than a user event, and I'm leery of dispatching a new (faux) user event type in order to be able to trigger the FileReference.save() call unless it's definitely a user event that would never be dispatched as a result of actual user interaction with my application.
In a nutshell what I'm doing now is this: I have a function that is registered as a handler for a button click. In this function I make my web service call to fetch data from the server. I also have a result handler function which gets invoked when the web service call completes, and it's in here that I want to call the FileReference.save() method since it's at this point that I know that the data is ready to be saved to a file. But the aforementioned restriction is blocking me from doing this -- I get an error:
Error #2176: Certain actions, such as those that display a pop-up window, may only be invoked upon user interaction, for example by a mouse click or button press.
I've tried many things to get around this such as creating a second mouse click event handler function with the FileReference.save() call within and calling it after a timeout interval (to give the web service time to complete), but I keep running into the same error -- maybe that approach doesn't work since the second function isn't registered as an event listener for the event type used as its argument.
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Mar 10, 2012
I created a screen(calculator) with bunch of buttons,i can handle button event with one handler.But i want to know that can we do a one handler for all buttons......likein java
we can perform the task of perticular button by like this
if(event.source=="button1")
{
}
[code].....
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Mar 29, 2011
According to Cairngorm architecture, we always have a fault handler in every command class for each service.How we can create a single Class for handling Fault handler event for all the services.
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May 27, 2011
I have a Tree, which has an itemRenderer. On the itemRenderer, driven by the XML conditions, objects are created dynamically and added as a children to nodes. These new objects shall trigger an event handler ( some click events mostly ). How do I pass the event handler to the tree and later to the dynamically created new objects inside itemRendere?
Something like:
<mx:Tree x="534" y="49" newObjectsOnClick="newObjectsOnClickHandler">
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Jul 10, 2009
I have a checkbox that is bound to a property:
<mx:CheckBox label="Show All" selected="{showAll}"/>
I want to trigger an event when the checkbox is toggled that will read the value of showAll after a change:
<mx:CheckBox label="Show All" selected="{showAll}" click="_list.refresh()" />
Where, in this case, _list is an ArrayCollection object whose filter function depends on the showAll field to choose values.It turns out that this doesn't work, or at least gives a strong appearance of not working (what with the values in the list not changing and all). Is there a documented order of events for this, so that I can discover which events are dispatched in which order, and whether the binding value change will have fired the time the click event is dispatched? Alternately, can someone recommend a better way of doing this?
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Mar 21, 2010
I'd like to have a double click event on a datagrid in Flex3. The following example only works if the Accordion (id = "mustBeSecond") container comes after the DataGrid. Why is the order of the components important and what can I do to prevent this behavior? (The example does not work. If you change the order of "mustBeSecond" and gridReportConversions" the example works fine)
<mx:Script>
<![CDATA[
import mx.controls.Alert;
[code].....
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Jul 9, 2009
In AS2 we can add additional event handler on same event as below code does.
on (rollOut, dragOut) {
// Statement 1
}
Now , I am workin in AS3 . So, how to add additional event handler on event in AS3
Let's say display Object's instance name is "myBtn"
Here I have include only Mouse Out only, Now I want to add additional event handler
myBtn.addEventListener(MouseEvent.MOUSE_OUT, myBtnEvent);
myBtnEvent(event:MouseEvent):void
{
// Statement 1
}
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Jun 10, 2010
I have an event listener for a custom event type. This custom event overrides the clone method as required.In this event listener I want to dispatch an instance of a different type of event... a different custom event instance altogether. It also overrides the clone method as required.The problem is I'm getting a type coercion error: TypeError: Error #1034: Type Coercion failed: ...I do not know what is trying to do the casting. My code is:
/* elsewhere in a method */
addEventListener(GestureEvent.GESTURE_SCALE, handlePinched);
/* the event handler */
[code].....
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Jul 13, 2009
I am writing a program that needs to go to a random frame after clicking a button. However, the program also needs to start on a random frame. When I call the function at the start of the program it gives me an 1120: Access of undefined property event error. The function is originally written as followed:
function randomMatchedTrial(event:MouseEvent) {
... lots of code that probably doesnt matter, but let me know if it does...
}
the program starts by calling the function as followed:
randomMatchedTrial(event)
Can event handler functions be called outside of the event listeners they are handling?
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Aug 12, 2011
I've got a really weird problem that I've boiled down to its fundamentals, and I'm hoping that someone here smarter than I am knows why AS3 would be acting this way. Attached is a ZIP with a few FLAs and .AS files. I'm using Flash CS5. Please bear with me as I explain the situation.
I have a class called TestChildA:
package testing
{
import flash.display.MovieClip;
[Code]...
For some reason, the fact that we're not trying to obtain a TestChildA reference allows the Frame 0 ActionScript in TestChildA.swf to execute properly. TestChildB, on the other hand, continues to fail Frame 0 execution since we're still getting a reference to it.
As we saw in the first version of the INIT handler above, querying the test_str variable out of the loaded content directly without trying to cast it worked fine. Why is it that using 'as' to get a specific reference to the content with the proper class results in the Frame 0 script of that content to fail running? Theoretically, the Frame 0 actions should have already been executed prior to reaching the INIT handler anyway, so it's doubly confusing.
If anyone has a better understanding than I of the ActionScript internals and can explain the reason for this issue,
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Feb 8, 2006
I have the next code:
mc.onPress=function()
{
//some code
}
How do I remove the event handler onPress?
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Aug 5, 2011
I'm adding event handlers to dynamically created movies. The event handler is not active and the cursor does not change to a finger over the clip Here is the applicable code.
Code:
function loadSubNav():void{
//Load Thumbnails
[code].....
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Apr 2, 2009
I would like to use System.showSettings(0) up front and trapwhen the user chooses Deny instead of Allow in an onStatus eventhandler as I show in attached code.
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Aug 7, 2011
We (AS3 coders) all know that one of the great things about the AS3 event model is that handlers are scoped to their containing objects. I'm writing an EventDispatcher for JavaScript, and trying to achieve the same effect.My question could be answered in a couple different ways:A: How does ActionScript 3 set scope within an event handler to the handler's container object, rather than to the event handler's caller (the IEventDispatcher on whom dispatchEvent() was invoked)?
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Jul 17, 2009
I'm using a progress bar component in a movie clip and this progress bar works loading an external movie clip. However, once the external clip is loaded, it seems the "complete" event is not registering with the object listener. This is what I have:
ActionScript Code:
this.createEmptyMovieClip("FOB", _root.getNextHighestDepth());
var progressBarListener:Object = new Object();[code].......
The code a little more complicated than this in that there is an array that stores some information and a setInterval command that calls the loadContent function loading each external movie clip. I can past the entire code if necessary.Also the progress bar component is set up as thus: in the main movie (root) there is a movie clip called progressBar. Within progressBar the component resides with a variant name of PB.For some reason, when the external clip is finished loaded, the progressBarListener doesn't seem to be called.
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Aug 8, 2009
I'm trying to find a way that I can control how a flash movie handles the click event from the HTML page outside the movie.
I run a website where we have advertising space for Flash Ads provided by our customers which, when clicked, open their own website in a new browser window (i.e. target='_blank') - however this causes us a few issues:
1.) We want to track the success of their ads, so we give them a custom URL that their ad should link to instead of linking directly to their site. This URL logs the click before redirecting the browser to the customer's website.
2.) Often the flash files we get use GetUrl() which seams to trigger the popup blockers in IE 7 & 8.
These two points mean we have to provide them with the custom URL for them to include in their flash ad, and/or tell them how to set up the movie to handle the clicks in a way that doesn't trigger the IE popup blocker, and this doesn't make it as seamless as it should be to place an ad on our site.
So, what I'm trying to do is find a way that I can reference the Flash movie object with JavaScript (or similar), and set the click event to open up a specified URL - so if the customer's flash movie doesn't have the right URL set in it, or is triggering IE's popup blocker it doesn't matter because when we display it, we can modify the event handler to use the correct URL and to open up their website without tripping any popup blockers.
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