[Xerte] Loop through an object?

[Julian Tenney]

I remember this now, from ages ago:
http://www.freelists.org/post/flashxmlengine/Looping-arrays-and-objects,1

FOL I'm afraid.

From: xerte-bounces at lists.nottingham.ac.uk [mailto:xerte-bounces at lists.nottingham.ac.uk] On Behalf Of Julian Tenney
Sent: 14 October 2010 07:29
To: Xerte discussion list
Subject: RE: [Xerte] Loop through an object?

take the 'var' out. We don't have 'var'.

________________________________
From: xerte-bounces at lists.nottingham.ac.uk [xerte-bounces at lists.nottingham.ac.uk] On Behalf Of Dave Burnett [d_b_burnett at hotmail.com]
Sent: 14 October 2010 00:15
To: Xerte list
Subject: RE: [Xerte] Loop through an object?

Paul, tried it before I posted:

tempGroup = new Object();
tempGroup.a = "1";
tempGroup.b = "2";
tempGroup.c = "3";

for (var prop in tempGroup) {
    debug("myObject." + prop + " = " + tempGroup[prop]);
}



Nothing.





________________________________
Subject: RE: [Xerte] Loop through an object?
Date: Wed, 13 Oct 2010 15:46:17 -0700
From: Paul.Swanson at harlandfs.com
To: xerte at lists.nottingham.ac.uk
Use the for..in statement:

for..in Statement

Usage


for (variableIterant in object) {
    statement(s);
}

Player version: Flash Player 5

Iterates over the properties of an object or elements in an array and executes the statement for each property or element. Methods of an object are not enumerated by the for..in action.

Some properties cannot be enumerated by the for..in action. For example, movie clip properties, such as _x and _y, are not enumerated. In external class files, static members are not enumerable, unlike instance members.

The for..in statement iterates over properties of objects in the iterated object's prototype chain. Properties of the object are enumerated first, then properties of its immediate prototype, then properties of the prototype's prototype, and so on. The for..in statement does not enumerate the same property name twice. If the object child has prototype parent and both contain the property prop, the for..in statement called on child enumerates prop from child but ignores the one in parent.

The curly braces ({}) that are used to enclose the block of statements to be executed by the for..in statement are not necessary if only one statement is executed.

If you write a for..in loop in a class file (an external AS file), then instance members are not available for the loop, but static members are. However, if you write a for..in loop in a FLA file for an instance of the class, then instance members are available but static ones are not.

Parameters
                variableIterant:String - The name of a variable to act as the iterant, referencing each property of an object or element in an array.

Example

The following example uses for..in to iterate over the properties of an object:

var myObject:Object = {firstName:"Tara", age:27, city:"San Francisco"};
for (var prop in myObject) {
    trace("myObject."+prop+" = "+myObject[prop]);
}
//output
myObject.firstName = Tara
myObject.age = 27
myObject.city = San Francisco

The following example uses for..in to iterate over the elements of an array:

var myArray:Array = new Array("one", "two", "three");
for (var index in myArray)
    trace("myArray["+index+"] = " + myArray[index]);
// output:
myArray[2] = three
myArray[1] = two
myArray[0] = one

The following example uses the typeof operator with for..in to iterate over a particular type of child:

for (var name in this) {
    if (typeof (this[name]) == "movieclip") {
        trace("I have a movie clip child named "+name);
    }
}

Note: If you have several movie clips, the output consists of the instance names of those clips.

The following example enumerates the children of a movie clip and sends each to Frame 2 in its respective Timeline. The RadioButtonGroup movie clip is a parent with three children: _RedRadioButton_, _GreenRadioButton_,, and _BlueRadioButton_.

for (var name in RadioButtonGroup) { RadioButtonGroup[name].gotoAndStop(2); }

From: xerte-bounces at lists.nottingham.ac.uk [mailto:xerte-bounces at lists.nottingham.ac.uk] On Behalf Of Dave Burnett
Sent: Wednesday, October 13, 2010 3:35 PM
To: Xerte list
Subject: [Xerte] Loop through an object?


myobject = new Object();


myobject[130] = "alpha";
myobject[230] = "bravo";
myobject[330] = "charlie";

Not knowing the numerics that will wind up in there, how do I loop through it?

e.g. I want to match the alpha values to something else and get the property.






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