Flex 3: syntax to power the ArrayCollection collection in loop

Similar Questions

• update of the arrayCollection collection

  Jin
  
  I have an arrayCollection collection each time it updates, I need to make some sort of a calculation, how can I do with mechanizm binding?
  
  Thank you
  Jean Michel

  There is an event collectionChange on the ArrayCollection collection that gets shot above power off when the ArrayCollection collection changes. You can capture this event and then sort the collection out of that.

  The reference of the language will give you a few details: http://livedocs.macromedia.com/flex/2/langref/index.html

  -Andy

• How to check whether or not the arraycollection collection is initialized

  Hi all

  I am bit new to use the collection arraycollection in flex. I'm having this particular scenario, where I get Server data in a table. So I have to check if the arracollection I created is initialized or not. If it is not initialized I need to initialize it or other wise, just add collection from table to table. Here is the code snippet

  currentTrajectory = new collection ArrayCollection (event.result as Array);

  var _multiTrajectoryEvent:MultiTrajectoriesEvent;

  _multiTrajectoryEvent = new MultiTrajectoriesEvent (MultiTrajectoriesEvent.DRAW_AUTO_TRAJ);

  If (!) (_multiTrajectoryEvent.trajectories.source is nothing))

  {

  _multiTrajectoryEvent.trajectories.addItem (currentTrajectory);

  }

  else

  {

  _multiTrajectoryEvent.trajectories = new ArrayCollection ([currentTrajectory]);

  }

  But unfortunately the above code does not work for me, because the arraycollection collection is not initialized first, there is no way of checking me if it is initialized later or not as the compiler gives me the error checking to null...

  Can any Walter suggest how can I check if the table collection is initialized or not?

  I would appreciate any suggestions and thouhgts for the same

  Thank you

  Akshay

  Sorry to say, but it's not the right approach...

  I'm abt don't know what is exactly done so I'll give a generic example...

  I have an ArrayCollection collection...

  private var arrC:ArrayCollection;

  Maybe it's getting used internally in several places, so you be sure if she be initialized already or not. Then use a code something like that...

  If (arrC! = null & arrC.length > 0)

  {

  ...

  ...

  }

  If you are using

  If (arrC.Length > 0)

  {

  ...

  ...

  }

  and it is not initialised it will give exceptional at the time to compile...

  For a logic if(a && b) be true both a and b must be true, so if same first one (a) is false it will not evaluate the second logic (b).

  Thus, the previous logic works.

  concerning

  Nishant

• Access table in the arraycollection collection and add the item at the end of the table

  for
  
  
  "login_user":"XXX"},i);
  
  //mess2=sess_MessArr[i2];
  //mess1=dispArray[i2].fwchat_message
  
  //searchArray(mess2);}
  
  
  
  
  
  (var i:int = 0; i< dispArray.length; ++i){
  
  dispArray[i]. 
  dispArray.addItemAt({
  

  
  I have this code to try to access the values in the table in the arraycollection collection, but that's not it actually creates a value at the end of the arraycollection collection. can someone tell me what im doing wrong I basically want retransmits the individual tables in the arraycollection collection and add Login_user

  So, I guess your ArrayCollection collection holds an array of objects, as follows:

  public var myAC:ArrayCollection = new ArrayCollection([{first:"bob",last:"smith"},{first:"jim",last:"jones"},{first:"mary",last:"allen"}]);
  

  And you try to add a new property of login_user to each of them, right?

  for each (var obj:Object in myAC) {
       obj.login_user = obj.first + "83";
  }
  

  Each person would be firstly, properties last and login_user.  In my example above, all the login_user would set their name + number 83, so adjust you accordingly for your application.

  It is the ease (for each rock for this situation).  However, if you want to paste the iterative approach, you have published, you can try this:

  for (var i:int = 0; i < myAC.length; i++) {
       myAC.getItemAt(i).login_user = myAC.getItemAt(i).first + "83";
  }
  

  I think that the for each syntax is clearer, but anyway works the way I think you want.

• Export the ArrayCollection collection in XML file

  Hi all

  Is it possible to export a Flex ArrayCollection collection to an XML file.

  My collection of table is displayed in a datagrid as follows

  < mx:DataGrid = "360" x y = "120" width = "448" height = "200" dataProvider = "{questionsArr}" >
  < mx:columns >
  < mx:DataGridColumn headerText = "Issue" dataField = "issue" / >
  < mx:DataGridColumn headerText = dataField "Start" = "start" width = "40" textAlign = "center" / >
  < mx:DataGridColumn headerText = "Stop" dataField = "stop" width = "40" textAlign = "center" / >
  < / mx:columns >
  < / mx:DataGrid >

  And I want to output the XML to look like this

  < cue >
  "< question section =" "start =" "stop =" "/ >
  "< question section =" "start =" "stop =" "/ >
  "< question section =" "start =" "stop =" "/ >
  < / cue >

  Is this possible?  I mean all the data is ready, he just needs to be saved. .

  Hi djh88ukwb,

  Try something as shown below in the link by performing a loop through the arraycollection collection and forming the knots... the way you need...

  http://nsdevaraj.WordPress.com/2008/08/20/ArrayCollection-XML/

  Thank you

  Jean Claude Chari

• get the fields of the arraycollection collection?

  I want to loop through a collection of table and access all the items (columns)
  
  the arrayCollection collection looks so
  
  .columnOne [1]
  .columnTwo [1]
  .columnThree [1]
  .columnfour [1]
  

  [Bindable] public var dataSet:ArrayCollection = new ArrayCollection();

  protected function application1_creationCompleteHandler(event:FlexEvent):void

  {

  TODO self-generating method stub

  var d: Array = new Array()

  var int count = 5;

  var c:Number, r: Number;

  for (var i: int = 0; i<>

  {

  c = Math.Floor (Math.Random () * 10)

  r = Math.Floor (Math.Random () * 10)

  d.push ({cost: i + 1})

  Recipes: 2 * i + 1

  });

  }

  dataSet.source = d;

  Call();

  }

  function call (): void

  {

  for each (var point: Object in dataSet)

  {

  (var key: string in point)

  {

  trace (Key)

  trace ([Key] Item)

  }

  }

  }

• How to get the child elements of the ArrayCollection collection?

  Hi all

  I want to analyze collection ArrayCollection and want the child node element.

  How to parse the arraycollection collection?

  for (var i: int = 0; i<>

  {if (arrayCollectionObject.getItemAt (i). Item is "requireditem")}

  your code

  break;

  }

  }

  Let me know if it helps

• Is it possible to search the ArrayCollection collection by index?

  Hi all

  I know, we can loop and compare each element of the ArrayCollection collection to get the correct item that we want. Obveriously, performance is going to hurt and it is not a wise method of search. Can we create an index for the key field of each item? Or any other class offering such a feature?

  Thank you

  When you say "a clue" are you talking like one in a table of database index?  That is something that can speed up a search?

  I'm trying to understand your desire and I think that what I hear, is that you have an ArrayCollection collection contains a number of objects.   When you want to find a particular object, you have found a way to locate the desired instance to browse each item in the collection ArrayCollection and ask "this element is equal to the key of the object I'm looking for?   I think that you are concerned by the amount of time it can take.

  Go back decades to my knowledge of computer science, this is an o(n) algorithm where n is the number of items in the table.

  Now, if there was an 'index' (ala databases) on the data, so if this index have been sorted, you would be able to find your match in O (log n)

  You can pay an O (n log n) cost the sort index when the data structure is created, but if you have a large number of research, then it can pay for itself.

  I'm not aware of any function that will help you on this out of the box (but that doesn't mean not there does not exist, only that I don't know about it.)

  I would like to also truthly ask yourself "is it worth the cost?   How many items you will have a typical table?  How often do you locate an entry in this table?

  Neil

• How to upgrade the ArrayCollection collection when running?

  Am facing a problem with the arraycollection collection...
  will have an arraycolelction like that...
  var dpHierarchy:ArrayCollection = new ArrayCollection([)
  {Region: "Application1"},
  {Region: "Demand2"},
  {Region: "Demand3"},
  [{Region: "APPROVISIONNEMENTS4"}]
  
  now what I'm looking for is... How to upgrade this arraycollection collection during execution using actions script?
  I need to update this collection table something like this...
  
  var dpHierarchy:ArrayCollection = new ArrayCollection([)
  {Region: "Application1", year: '2008'},
  {Region: "demand2', year: '2008'},
  {Region: "Demand3', year: '2008'},
  [{Region: "APPROVISIONNEMENTS4", year: '2008'}]
  
  How to add the year field in to existing collection arraycollection as shown in the example...
  
  Thanks in advance
  Pratap
  

  Hey get...

  I have to just give

  dpHierarchy [0] ['year'] = '2008 '.

  :-)

• Add a line of DataGrid using the ArrayCollection collection

  Work of one of these, when I hard code do it programmatically is not:
  
  Hard-coding approach 1 - *.
  var acData:ArrayCollection = new ArrayCollection();
  ...
  
  Each DataGridColum has a dataField like "col1", "col2", "col3", etc...
  Therefore, adding items like this works
  acData.addItem({col0:"testa",col1:"testb",col2:"testc",col3:"testd",col4:"teste"});)
  
  
  2 - programming approach *.
  But adding items like that does not work
  for (var j = 0; j < dataRows.length (); j ++) {}
  var t:String = [j] of dataRows m:System.NET.SocketAddress.ToString (); dataRows is of type XMLList, data are formatted as the format above
  I did a breakpoint to check and someone else watch the channel and it matches the format that works.
  acData.addItem (t);
  }
  
  When I try the second approach, I get all the content of the string in each cell of the grid, where, in the first approach, I get "tested" in the first column, "testb" in the second column (without quotes of course), etc...
  
  Anyone know why there is a difference or what I am doing wrong?
  
  Thanks in advance.
  
  
  

  I guess that's because in the second approach, you add a string to your ArrayCollection collection instead of an object as in the first approach:

  acData.addItem({col0:"testa",col1:"testb",col2:"testc",col3:"testd",col4:"teste"});) This is an object with the properties that you add to the ArrayCollection collection

  var t:String is dataRows [j] m:System.NET.SocketAddress.ToString ();. It is a string, not an object
  acData.addItem (t); you add a string to the ArrayCollection collection

  You must take your XML string and generate a new object, as in your first approach, using the End Sub

• NEED HELP as soon as possible - the ArrayCollection collection analysis

  Hi all

  My web service returns a collection of table as follows with the following columns: name, ID, power, time.

  An example of the full collection would be: name Power Hour

  Texas                 5                    6

  New York 6.4 6

  2.1 the California 6

  Texas                 5.1                 7

  New York 6.5 7

  2.6 California 7

  I wish that my histogram of having another series for each different name so they would side Side(x axis = hour, y axis = power), now my problem is that I can't link the original collection of table to a chart I want.  So I need to change the table something like this:(I think)

  Time New York California Texas

  6          5          6.4                    2.1

  7          5.1       6.5                   2.6

  any help is greatly appreciated! Code... even more! Thank you guys!

  Yes, that's my bad.

  After looking a little closer to the example, it seems you need actually a series for each value of time, not each SiteName. You also composed the data in objects with a property name for each time value. Unfortunately, each category axis would be evenly size a SiteName with only 2 values would be the same size as the one with 10 different values. I did, however, this small example that uses stacked columns sort of you show how the series is implemented. If this does not work for you, you will have googled around to see how you can make a desabscisses with dynamic widths axis.

  
  http://ns.adobe.com/mxml/2009" xmlns:mx="library://ns.adobe.com/flex/mx"
                    xmlns:s="library://ns.adobe.com/flex/spark" height="100%" width="100%"
                    creationComplete="creationCompleteHandler(event)" >
  
       
            
       
  
       
  
       
  
       
  
            
  
                 
                      
                 
  
            
  
       
  
  
  

• setItemAt on the ArrayCollection collection

  I'm changing the value of any element in an arrayCollection collection. For example...

  private var productArray:ArrayCollection = new ArrayCollection ([] collection
  {result: 'Red', count: 32},.
  {fruit: 'Blue', count: 47},.
  {result: 'Yellow', count: 62}.
  ([{result: 'Green', count: 35}]) ;

  productArray.setItemAt ({fruit: "Purple", count: 20}, 0);  This gives an error of access of undefined property productionArray

  Can't seem to understand the setitemAt() after looking at the manual and search for examples.  How can I change the values in an existing ArrayCollection collection?

  Thank you.

  Check your spelling, the error complained of productionArray not productArray.  Or maybe just clean and re - build.

  Alex Harui

  Flex SDK Developer

  Adobe Systems Inc..

  Blog: http://blogs.adobe.com/aharui

• Condition in the ArrayCollection collection

  I have an ASP application that retrieves the files form a MS SQL Server db.

  My flex application the user can select the desired file to download. It search the name of the file as it is written in my flex application which is worng because the actual name in the SQL Server db is different.

  So now I'm trying to solve this problem with an ArrayCollection collection that has the file name time as Flex knows it and the name of the SQL Server.

  var sdeName:ArrayCollection = new ArrayCollection([)
  {label: "labelInFlexApp", data: 'labelInSQL'}
  ]);
  
  If (sdeName [label] == item.label) {}
  Item.label = sdeName [data];
  var url: String = " " http://Server/getMetaData/metadata.aspx?sdeFeatName= " "+ item.label +"&"+"outFormat = ISO";

  }

  I do not know how to find the value in my ArrayCollection collection and compare it with the real one.

  Thank you

  Manolo

  Hello

  Try:

  if (sdeName.getItemAt(i)["label"] == item.label) {
  

  Instead of:

  if (sdeName.getItemAt(i).[label] == item.label){
  

• Extract information from the arrayCollection collection

  Hello world

  I have a very simple problem, but I'm a new flex developer and I have no idea what to do.

  that I extracted information from a database by using a Web service in coldfusion.

  in flex, I recovered my query result in an arrayCollection collection

  private var tabInfosDriver:ArrayCollection

  Private function driverInfoHandler(event:ResultEvent):Sub

  tabInfosDriver = event.result as ArrayCollection; collection

  and if I give {tabInfosDriver} as a dataprovider to a DataGrid, the result of the query is displayed correctly, something like that.

  Header1	By tete2	Header3	Header4	Header5
  someValue	value2	someValue3	someValue4	someValue5

  
  now, I want to use header1 someValue to fill a textField instance.

  I tried:

  Label1.text = tabInfosDriver.getItemAt (1.0) m:System.NET.SocketAddress.ToString)

  but it wrong: the index table out of range and in any case, I want to use the name of the header field, which is the database table to call its value

  Label1.text = tabInfosDriver.getItemAt("header1").value.toString)

  What can I do? I don't know that it is easy to solve. I looked at all the methods of the collection arrayCollection object, but I can't understand wich one to use.

  Please forgive me of my language, I do not speak English very often.

  Dominic

  Often you can either return the data to the Flex application in standard object notation, or to reconfigure the data in this way once he returns to the Flex application in the result handler. The standard notation, to which I am referring is:

  {

  {key1: 'value 1', key2: "Value2", key3: "Value3"},

  {key1: 'value 1', key2: "Value2", key3: "Value3"},

  {key1: 'value 1', key2: "Value2", key3: "Value3"},

  {key1: 'value 1', key2: "Value2", key3: "Value3"}

  }

  So in this way the data is structured, already as an associative array, because such a table is really just an ActionScript object.

  If these data should be accessible in two ways:

  var tempVar:String = myObject.key1;

  var tempVar:String = myObject ["key1"];    (maybe myObject ["key1"])

  Moreover, this "standard object notation" is also known under the name of JSON and there are libraries for handling JSON to the format of the data in Flex, PHP, etc if you have not necessarily to treat it as JSON, which comes, which makes it a little more formal and provides additional APIs:

  http://code.Google.com/p/AS3corelib/

• Helps the ArrayCollection collection

  Hello

  I need help on the syntax of how to get and set the elements in a 2 dimensional ArrayCollection collection list.  For example if I have the following:

  public var vline:ArrayCollection = new ArrayCollection([)
  {time: 0, line: 10}

  {time: 1 line: 0},.
  {time: line 2: 0},.
  {time: line 3: 0},.

  ....

  How can I get

  online time = 1

  How to set

  line 10 in time = 2

  I hope you can help,

  You can also directly access:

  vLine [0] .line = 55;  sets the value at 55 instead of 10

  vline.getItemAt (0) .line = 65; sets the value to 65 instead of 10

  So, you can use the syntax of support [] or the getItemAt and directly access your .line and hung up "Properties".