Alert Component, handling event in a better way

Something around the mid September, there was a post on using Alert Component for Flash MX 2004 Pro.

There had been a project (classified as of now) here where Alert Component was commissioned to be used for all Alerts (that is what they are for). Then couple of issues arose, of which, I am not sure if people have already known that, solved through a better way or have better ways of handling the issue. Like the examples in the doc and like the one in the recent post for the Alert component, a need arises to do something similar but from nested classes. If the function reference are specified like a normal callback, the scope in which the function is called becomes undefined. The need was to pass the handler object and the string callback function, so that callback is in the correct scope.

Well, according to the example in the docs the clickHandler is a function reference. But if you pass a function reference as a argument, the scope with which the function is called is not going to be what you need. To get around to this, a listener object which had a click method was used, instead of the function reference and it worked; found the tip in the Using Component Events tree. Now, should we say that the docs are wrong on this. You have to pass a listener object that is either handling the event the DOM way or listen to the event the new dispatcher way.

this.confirmListener = {
 click:function (evt) {
  trace (evt.detail);
 };
};

var Alert = mx.controls.Alert;
Alert.okLabel = "Synchronize Now";
Alert.cancelLabel = "Add New";
Alert.yesLabel = "Close";
Alert.buttonWidth = 100;

Alert.show (
 "Message",
 "Confirmation",
 Alert.OK | Alert.CANCEL | Alert.YES,
 this,
 this.confirmListener,
 "",
 Alert.OK
);

Brajeshwar posted this article on Sat, Nov 8th, 2003 at 7:43 pm
Categorized under Technology and has the following tags

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Andre Angelantoni November 13th, 2003 at 12:47 am 1

Hi, I tried your solution to using an alert within a class, but with no luck. The syntax checker comes back with “There is no property with the name ‘confirmListener’”.

The code is within a method of a form class, so it suffers from the scope issue you discuss above.

Here is the code:

private function isOptionsValid():Boolean {
var isValid = false;
var confirmListener:Function = null;
var messageStr:String = null;

Alert.okLabel = “YES!!!”;

confirmListener = {
click: function (evt) {
trace (evt.detail + “was clicked”);
}
};

if (2 > 1) {
messageStr = “The number of Open File licenses is greater than the sum of servers and clients. Is this OK?”;
Alert.show(messageStr, “Confirm Open File Licenses”, Alert.YES | Alert.NO, this, confirmListener, null, Alert.OK);
}
return true;
}

Have you successfully used the method you described from within a class?

Thanks for your great site
Andre
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Alessio Prosperi March 29th, 2004 at 3:23 pm 4

The correct code to use Alert Component is:

import mx.controls.Alert;

class test{
private var myAttr:String;

public function test(){
myAttr = “This is a test”;
}
public function click(evt){
trace(evt.detail + ” in class: ” + myAttr);
}

public function foo(){
Alert.show(”Message”, “Confirmation”, Alert.OK | Alert.CANCEL | Alert.YES, null, this, “”, Alert.OK);
}
}

I hope it has been usefull!
Bye