ActionScript 3.0 :: Flash Checking If Variable Exists In Object
Nov 28, 2011
I'm attempting to make a platform game. Each level is contained within it's own MovieClip, which has it's own class. Each of these classes extend the Level class, which provides basic functionality for all levels.
Each individual level has a numPlatforms variable which stores the number of platforms in that particular level. I currently have a for loop that runs from 1-numPlatforms and sets the level area (the image, more or less) the platform contains:
[Code]....
Is there any way to check if a variable exists within a MoveClip? I've trying comparing it to null and also to undefined, but neither works.
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Feb 10, 2010
I have a name for the object, but it doesn't seem to work.Anyone know why this doesn't work?
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May 26, 2009
I have a gallery loading jpegs from an xml file into a mc called mainPicArea, on frame 5. I have other content on frames 1,2,3,4,6,7.
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Feb 15, 2010
I have a gallery loading jpegs from an xml file into a mc called mainPicArea, on frame 5. I have other content on frames 1,2,3,4,6,7.I want to run an if statement to check whether mainPicAreaexists and if it does, then run a removeChild(mainPicArea), and if not do nothing.
code:
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[code]....
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Code:
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Engine.as
Code:
package code {
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import flash.display.Stage;[code]...
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Jan 29, 2011
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In flex, how to check if a variable exists? I have tried using
if (this['some_variable'] != undefined) {
//do something
}
There is a run time error saying the property some_variable does not exists. I have checked with null instead of undefined, still the same error.
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1- Variable Scope : Accessibility and existence are used almost interchangeably in various documents I've read. I'd like to know if a local variable physically exists (in memory) outside of the function it was declared in, and is not accessible from other methods, or if its existence ceases outside the function.
2- Classes : When do you create an instance of a class versus importing it only, specifically in the case of classes used only as say, calculators ?
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Sep 26, 2009
the example is this, wich i am trying to remove a movieClip wich is 'mc' by clicking button, but after i click it, the object mc is still traced every time the startTrace initiates, that means its still there right? im using flash cs4,
Quote:
var mcRef;
var mc:MovieClip = new MovieClip();
this.addChild(mc);
mc.name = 'mc';
[Code].....
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Jul 14, 2009
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[code]....
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Aug 25, 2009
I need to know if it's possible to check to see if a variable contains any information or if it's just blank basically I have a text file on the server that may or may not have a url in it, I have my flash file programmed to grab the url from that text file and apply it to a button that when clicked brings up that URL...but that text file may not always have a URL in it, so for those times i want the button to not be clickable, or at least not attempt to go to a URL.
[Code]....
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Mar 3, 2009
can I check if a movieclip has a function to call it just when it exists?
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Feb 17, 2009
why this does not work? There is an empty Canvas and a Button. When the button is clicked, it creates a new Image and adds it to the Canvas - which happens. But when I click on the Image to drag it, Flex throws this error.1009: Cannot access a property or method of a null object reference.
[AS]
import mx.controls.Image;
import flash.events.MouseEvent;
var layerIDs:uint = 0;
[code]....
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Jul 7, 2010
I'm trying to:Jump from frame 1 to a frame later in the main timeline Reference an object that exists on the stage in that frame, but not in frame 1
Like so:
ActionScript Code:
function endGame():void {
gotoAndPlay("gameOver");
scoreField.visible = false;
}
A movieclip with the instance name 'scorefield' exists in the "gameOver" frame, yet for some reason, I just get a "Cannot access a property or method of a null object reference." This code is all within a function. By the time the reference to scoreField is executed, the timeline is at the right frame.
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