cant find the error. needless to say that I am a newb. Any help would be highly apreciated
public function setDestination(param1:String, param2, param3:Boolean = true) : void
{
var _loc_4:* = {};
{}[param1] = param2;
updateTo(_loc_4, param3);
return;
}// end function
Your error is related to this line:
{}[param1] = param2;
Though I can't be sure of what was actually intended here, it may have been this:
_loc_4[param1] = param2;
Related
When using ObjectUtil there is a method called, toString() that takes an object. If you pass it a class named, "Person" it will return the string "[class Person]".
var person:Person = new Person();
trace(ObjectUtil.toString(person));//UPDATE I'm not using ObjectUtil.toString()
// traces [class Person]
Is there a toObject() method? Something that takes the same format toString outputs and creates an instance like so:
var person:Person = ObjectUtil.toObject("[class Person]");
UPDATE:
Sorry. This is incorrect. I thought I was using ObjectUtil.toString(). I was not. When I use that method it returns something like:
(com.printui.assets.skins::fontList)#0
accessibilityDescription = ""
accessibilityEnabled = true
accessibilityImplementation = (null)
In my code somewhere it is returning "[class Person]" like I was described. This is the line:
var currentValue:* = target[property];
popUpValueInput.text = currentValue;
I thought it was using instance.toString() but toString() is not returning anything close to that:
var f:fontList = new fontList();
var f1:fontList = new fontList();
trace("" + f);
trace("" + f1);
trace(f1.toString());
Results in:
fontList2
fontList5
fontList5
In general you should do this:
In your Person class add this method:
public function toString():String
{
return "Person" ;
}
So to make an instance of the class by name use this code:
var p = new (getDefinitionByName( ObjectUtils.toString(person)))
or it can be used a regex in general for all classes (thanks to 1.21 gigawatts ):
var p = new (getDefinitionByName( ObjectUtil.toString(Person).match(/\((.*)\)/)[1] ) );
I'm having a mental block, can someone remind me what the correct term for returning early from a function is, i.e.
private MyObject DoSomeStuff(string myValue)
{
//What is this called?!?!?
if(myValue == string.Empty)
return null;
MyObject obj = new MyObject();
obj.Value = myValue;
return obj;
}
I believe it's called a guard clause.
I would potentially call this an Interrupt. Or, simply, and Early Return. Break might work, too.
I would call it a "precondition test".
i'd like to throw an argument error if a particular function doesn't work without a passed value that also happens to be a public constant of the class containing the function.
is there anyway to determine if a class owns a public constant instead of having to iterate thru all of them?
something like this:
public static const HALIFAX:String = "halifax";
public static const MONTREAL:String = "montreal";
public static const TORONTO:String = "toronto";
private var cityProperty:String;
public function set city(value:String):void
{
if (!this.hasConstant(value))
throw new ArgumentError("set city value is not applicable.");
cityProperty = value;
}
public function get city():Strig
{
return cityProperty;
}
currently, for this functionality i have to write the city setter function like this:
public function set city(value:String):void
{
if (value != HALIFAX && value != MONTREAL && value != TORONTO)
throw new ArgumentError("set city value is not applicable.");
cityProperty = value;
}
is this the only way to accomplish this task?
Yes, if you use reflections:
private var type:Class;
private var description:XML;
private function hasConstant (str : String ) : Boolean
{
if (description == null)
{
type = getDefinitionByName (getQualifiedClassName (this)) as Class;
description = describeType (type);
}
for each ( var constant:XML in description.constant)
{
if (type[constant.#name] == str) return true;
}
return false;
}
Note that for this to work, all constants must always be String objects declared public static const.
I was looking for an answer to this question myself and found it annoying that hasOwnProperty() did not work for static properties. Turns out though, that if you cast your class to a Class object, it does work.
Here's an example:
public final class DisplayMode
{
public static const one: String = "one";
public static const two: String = "two";
public static const three: String = "three";
public static function isValid(aDisplayMode: String): Boolean {
return Class(DisplayMode).hasOwnProperty(aDisplayMode);
}
}
I owe this solution to jimmy5804 from this discussion, so hats off to him.
You should be able to use bracket notation to do this. For example:
var foo:Sprite = new Sprite();
foo.rotation = 20;
trace( foo["x"], foo["rotation"]); // traces "0 20"
or more specific to your case:
var bar:String = "rotation";
trace( foo[bar] ); // traces "20"
The only thing you have to look out for here, is that the bracket accessor will throw a ReferenceError if you ask for an object property that isn't there, such as:
trace ( foo["cat"] ); // throws ReferenceError
But it will not throw if you are asking for a static property:
trace ( Sprite["cat"] ); // traces "undefined"
So in your case you might try:
if ( this[value] == undefined ) {
throw new ArgumentError("set city value is not applicable.");
}
EDIT:
Sorry, I was confusing the const's names with their values.
For this to work on your problem you would have to make the String value the same as the const's name, so for example:
public static const HALIFAX:String = "HALIFAX";
then you could use the query as described above and it would give you the desired result.
I am trying to understand the way the AsyncToken works in actionscript. How can I call a remote service and ensure that a specific parameter is available in the result or fault event functions? I think it is the async functionality I want to use.
The following code will hopefully explain what I am trying to do. Feel free to modify the code block as your explanation.
Thanks.
public function testSerivceCall(data:Object, callBackCommand:String):void
{
// Assume callBackCommand == "FOO";
// How can I pass in callBackCommand as a parameter to the result or fault events?
// How do I create an async token here?
var remoteObject:RemoteObject;
remoteObject = new RemoteObject();
remoteObject.destination = "zend";
remoteObject.source = "MyService";
remoteObject.endpoint = "http://example.com/service";
remoteObject.test.addEventListener(ResultEvent.RESULT, _handleTestResult);
remoteObject.test.addEventListener(FaultEvent.FAULT, _handleTestFault);
remoteObject.test(data);
}
private function _handleTestResult( event:ResultEvent ) : void
{
// How do I get the async token value?
// How can I get the value of callBackCommand in this code block?
if (callBackCommand == "FOO")
{
// do something related to "FOO"
}
else
{
// do something else with the result event
}
}
private function _handleTestFault( event:FaultEvent ) : void
{
// How do I get the async token value?
// How can I get the value of callBackCommand in this code block?
}
An edit to make this question more clear:
Assume I make the following method call somewhere in my code:
testSerivceCall(personObject, "LoginCommand");
How do I get access to the actual string "LoginCommand" inside the _handleTestResult function block?
The reason I want to do this is because I want to dynamically call back certain functions and hand off the result data to specific commands that I know ahead of time when I am making the service call.
I am just having a time grokking the AsyncToken syntax and functionality.
I did not even need closures. I added a class as below which I called externally.
The call was like this:
public class MyClass
{
...
var adminServerRO:AdminServerRO = new AdminServerRO();
adminServerRO.testSerivceCall("FOO",cptyId);
}
public class AdminServerRO
{
private function extResult( event:ResultEvent, token:Object ) : void
{
//the token is now accessed from the paremeter
var tmp:String = "in here";
}
private function extFault( event:FaultEvent ) : void
{
var tmp:String = "in here";
}
public function testSerivceCall(callBackCommand:String, cptyId:String):void
{
var remoteObject:RemoteObject = new RemoteObject();
remoteObject.destination = "adminServer";
var token:AsyncToken = remoteObject.getCounterpartyLimitMonitorItemNode(cptyId);
token.addResponder(new AsyncResponder(extResult,extFault,cptyId));
}
}
While the accepted answer will accomplish what the original submitter wants it does not actually answer the question which was asked. An AsyncToken is created as a result of a remote method call and is accessible from the ResultEvent. Since AsyncToken is a dynamic class you can add whatever property to it that you want. The code below should demonstrate this:
public function testSerivceCall(data:Object, callBackCommand:String):void
{
var remoteObject:RemoteObject;
remoteObject = new RemoteObject();
remoteObject.destination = "zend";
remoteObject.source = "MyService";
remoteObject.endpoint = "http://example.com/service";
remoteObject.test.addEventListener(ResultEvent.RESULT, _handleTestResult);
remoteObject.test.addEventListener(FaultEvent.FAULT, _handleTestFault);
var token:AsyncToken = remoteObject.test(data);
token.callBackCommand = callBackCommand;
}
private function _handleTestResult( event:ResultEvent ) : void
{
if (event.token.callBackCommand == "FOO")
{
// do something related to "FOO"
}
else
{
// do something else with the result event
}
}
private function _handleTestFault( event:FaultEvent ) : void
{
//event.token.callBackCommand should be populated here too
}
If you want to access the properties used during the remote call (parameters to the call and/or AsycToken), you can make use of closures. Just define the result event handler inside the calling method as a closure. It can then access any variable in the calling function.
public function testSerivceCall(data:Object, callBackCommand:String):void
{
var _handleTestResult:Function = function( event:ResultEvent ) : void
{
// token is visible here now
if (callBackCommand == "FOO")
{
// do something related to "FOO"
}
else
{
// do something else with the result event
}
}
var remoteObject:RemoteObject;
remoteObject = new RemoteObject();
remoteObject.destination = "zend";
remoteObject.source = "MyService";
remoteObject.endpoint = "http://example.com/service";
remoteObject.test.addEventListener(ResultEvent.RESULT, _handleTestResult);
remoteObject.test.addEventListener(FaultEvent.FAULT, _handleTestFault);
var token = remoteObject.test(data);
}
If I'm reading your question correctly, you're trying to figure out how to access the actual data returned by the ResultEvent ?
If so, assuming you've made the call correctly and you've gotten data back in a format you're expecting:
private function _handleTestResult( event:ResultEvent ) : void
{
// you get the result from the result property on the event object
// edit: assuming the class Person exists with a property called name
// which has the value "John"
var person : Person = event.result as Person;
if (person.name == "John")
{
Alert.show("John: " + person.name);
}
else
{
Alert.show("Not John: " + person.name);
}
}
private function _handleTestFault( event:FaultEvent ) : void
{
// Maybe you know the type of the returned fault
var expectedFault : Object = event.fault as MyPredefinedType
if (expectedFault.myPredefinedTypesPredefinedMethod() == "BAR")
{
// something here
}
}
The ResultEvent has a property called result which will hold an instance of the object returned by the result (it might be the output of an XML file if using a web service, or a serialized object if using AMF, for example). This is what you want to access. Similarly, FaultEvent has a fault property that returns the fault information.
Edit: Changed code in _handleTestResult() in response to Gordon Potter's comment.
I'm developing a flash (Flash 9, AS3) to connect to a server and send/receive/parse data to a chat on JavaScript/HTML.
I have a structure like this:
package {
public class myClass {
String.prototype.escapeHtml = function() {
var str = this.replace(/&/g, "&");
str = str.replace(/</g, "<");
str = str.replace(/>/g, ">");
return str;
}
function writeToBrowser(str:String) {
ExternalInterface.call("textWrite",str.escapeHtml());
}
}
}
When I compile it, I get this error:
1061: Call to a possibly undefined
method escapeHtml through a reference
with static type String.
If I remove the :String, it all works fine, but then I'd have to check if str is a String and if it's not undefined and so on.
I have many functions like this on my code, many of them receive user-entered data, so I think that removing the :String and doing many checks on every function isn't the best approach.
How can I make this right?
Then just define the function:
public function escapeHtml( str : String ) : String
{
var str = this.replace(/&/g, "&");
str = str.replace(/</g, "<");
str = str.replace(/>/g, ">");
return str;
}
in your class.
And call it:
public function writeToBrowser( str : String )
{
ExternalInterface.call( "textWrite", escapeHtml( str ) );
}
:)
you get an error because the compiler is in strict mode.
if you want to stay in strict mode you can try this:
ExternalInterface.call("textWrite",str["escapeHtml"]() );
Prototype is actually legacy.
You should extend the String class and use your custom class
package {
public class myClass {
public function writeToBrowser(str:CustomString) {
ExternalInterface.call("textWrite",str.escapeHtml());
}
}
public class CustomString {
public function escapeHtml():String {
var str = this.replace(/&/g, "&");
str = str.replace(/</g, "<");
str = str.replace(/>/g, ">");
return str;
}
}
}