var testArr:Array; function resultHandler(result){ testArr=result; //first attempt - failed dataGrid.dataProvider = testArr; } Second attempt. I tried to reference the array directly in the datagrid itself - failed. Do I need columns first (like you mentioned)?? Do I need to cycle thru my array and add the information to the DG row by row? Also, you mentioned that a "java class, if not registered to an actionscript class, should come back as a dynamic object" - does this mean that I simply need to import the proper package in my AS and instantiate accordingly? Again, thanks for your patience and help! [allowsmilie] => 1 [showsignature] => 0 [ipaddress] => [iconid] => 0 [visible] => 1 [attach] => 0 [infraction] => 0 [reportthreadid] => 0 [isusenetpost] => 1 [msgid] => [ref] => [htmlstate] => on_nl2br [postusername] => agh1 [ip] => webforumsuser@m [isdeleted] => 0 [usergroupid] => [membergroupids] => [displaygroupid] => [password] => [passworddate] => [email] => [styleid] => [parentemail] => [homepage] => [icq] => [aim] => [yahoo] => [msn] => [skype] => [showvbcode] => [showbirthday] => [usertitle] => [customtitle] => [joindate] => [daysprune] => [lastvisit] => [lastactivity] => [lastpost] => [lastpostid] => [posts] => [reputation] => [reputationlevelid] => [timezoneoffset] => [pmpopup] => [avatarid] => [avatarrevision] => [profilepicrevision] => [sigpicrevision] => [options] => [akvbghsfs_optionsfield] => [birthday] => [birthday_search] => [maxposts] => [startofweek] => [referrerid] => [languageid] => [emailstamp] => [threadedmode] => [autosubscribe] => [pmtotal] => [pmunread] => [salt] => [ipoints] => [infractions] => [warnings] => [infractiongroupids] => [infractiongroupid] => [adminoptions] => [profilevisits] => [friendcount] => [friendreqcount] => [vmunreadcount] => [vmmoderatedcount] => [socgroupinvitecount] => [socgroupreqcount] => [pcunreadcount] => [pcmoderatedcount] => [gmmoderatedcount] => [assetposthash] => [fbuserid] => [fbjoindate] => [fbname] => [logintype] => [fbaccesstoken] => [newrepcount] => [vbseo_likes_in] => [vbseo_likes_out] => [vbseo_likes_unread] => [temp] => [field1] => [field2] => [field3] => [field4] => [field5] => [subfolders] => [pmfolders] => [buddylist] => [ignorelist] => [signature] => [searchprefs] => [rank] => [icontitle] => [iconpath] => [avatarpath] => [hascustomavatar] => 0 [avatardateline] => [avwidth] => [avheight] => [edit_userid] => [edit_username] => [edit_dateline] => [edit_reason] => [hashistory] => [pagetext_html] => [hasimages] => [signatureparsed] => [sighasimages] => [sigpic] => [sigpicdateline] => [sigpicwidth] => [sigpicheight] => [postcount] => 3 [islastshown] => [isfirstshown] => [attachments] => [allattachments] => ) --> var testArr:Array = new Array(); var testArr2:Array = new Array(); var counter:Number = 0; function resultHandler(result){ //I'm returning a 3 element Object[] testArr=result; for (var i : Number = 0;i Nothing populates in the DG. I tried to use a plain string with one element in it and that worked ..... I think I'm close! Any further assistance you could provide me would be great!! Thanks In advance for all of your help. Andy [allowsmilie] => 1 [showsignature] => 0 [ipaddress] => [iconid] => 0 [visible] => 1 [attach] => 0 [infraction] => 0 [reportthreadid] => 0 [isusenetpost] => 1 [msgid] => [ref] => [htmlstate] => on_nl2br [postusername] => agh1 [ip] => webforumsuser@m [isdeleted] => 0 [usergroupid] => [membergroupids] => [displaygroupid] => [password] => [passworddate] => [email] => [styleid] => [parentemail] => [homepage] => [icq] => [aim] => [yahoo] => [msn] => [skype] => [showvbcode] => [showbirthday] => [usertitle] => [customtitle] => [joindate] => [daysprune] => [lastvisit] => [lastactivity] => [lastpost] => [lastpostid] => [posts] => [reputation] => [reputationlevelid] => [timezoneoffset] => [pmpopup] => [avatarid] => [avatarrevision] => [profilepicrevision] => [sigpicrevision] => [options] => [akvbghsfs_optionsfield] => [birthday] => [birthday_search] => [maxposts] => [startofweek] => [referrerid] => [languageid] => [emailstamp] => [threadedmode] => [autosubscribe] => [pmtotal] => [pmunread] => [salt] => [ipoints] => [infractions] => [warnings] => [infractiongroupids] => [infractiongroupid] => [adminoptions] => [profilevisits] => [friendcount] => [friendreqcount] => [vmunreadcount] => [vmmoderatedcount] => [socgroupinvitecount] => [socgroupreqcount] => [pcunreadcount] => [pcmoderatedcount] => [gmmoderatedcount] => [assetposthash] => [fbuserid] => [fbjoindate] => [fbname] => [logintype] => [fbaccesstoken] => [newrepcount] => [vbseo_likes_in] => [vbseo_likes_out] => [vbseo_likes_unread] => [temp] => [field1] => [field2] => [field3] => [field4] => [field5] => [subfolders] => [pmfolders] => [buddylist] => [ignorelist] => [signature] => [searchprefs] => [rank] => [icontitle] => [iconpath] => [avatarpath] => [hascustomavatar] => 0 [avatardateline] => [avwidth] => [avheight] => [edit_userid] => [edit_username] => [edit_dateline] => [edit_reason] => [hashistory] => [pagetext_html] => [hasimages] => [signatureparsed] => [sighasimages] => [sigpic] => [sigpicdateline] => [sigpicwidth] => [sigpicheight] => [postcount] => 6 [islastshown] => [isfirstshown] => [attachments] => [allattachments] => ) --> var myItems:Array = new Array(); function resultHandler(result){ var test:Object = new Object({name:"Tracy",position:"developer"}); var test2:Object = new Object({name:"Andy",position:"manager"}); myItems[0] = test; myItems[1] = test2; } I appreciate your help Tracy! Am I on the right track? Andy [allowsmilie] => 1 [showsignature] => 0 [ipaddress] => [iconid] => 0 [visible] => 1 [attach] => 0 [infraction] => 0 [reportthreadid] => 0 [isusenetpost] => 1 [msgid] => [ref] => [htmlstate] => on_nl2br [postusername] => agh1 [ip] => webforumsuser@m [isdeleted] => 0 [usergroupid] => [membergroupids] => [displaygroupid] => [password] => [passworddate] => [email] => [styleid] => [parentemail] => [homepage] => [icq] => [aim] => [yahoo] => [msn] => [skype] => [showvbcode] => [showbirthday] => [usertitle] => [customtitle] => [joindate] => [daysprune] => [lastvisit] => [lastactivity] => [lastpost] => [lastpostid] => [posts] => [reputation] => [reputationlevelid] => [timezoneoffset] => [pmpopup] => [avatarid] => [avatarrevision] => [profilepicrevision] => [sigpicrevision] => [options] => [akvbghsfs_optionsfield] => [birthday] => [birthday_search] => [maxposts] => [startofweek] => [referrerid] => [languageid] => [emailstamp] => [threadedmode] => [autosubscribe] => [pmtotal] => [pmunread] => [salt] => [ipoints] => [infractions] => [warnings] => [infractiongroupids] => [infractiongroupid] => [adminoptions] => [profilevisits] => [friendcount] => [friendreqcount] => [vmunreadcount] => [vmmoderatedcount] => [socgroupinvitecount] => [socgroupreqcount] => [pcunreadcount] => [pcmoderatedcount] => [gmmoderatedcount] => [assetposthash] => [fbuserid] => [fbjoindate] => [fbname] => [logintype] => [fbaccesstoken] => [newrepcount] => [vbseo_likes_in] => [vbseo_likes_out] => [vbseo_likes_unread] => [temp] => [field1] => [field2] => [field3] => [field4] => [field5] => [subfolders] => [pmfolders] => [buddylist] => [ignorelist] => [signature] => [searchprefs] => [rank] => [icontitle] => [iconpath] => [avatarpath] => [hascustomavatar] => 0 [avatardateline] => [avwidth] => [avheight] => [edit_userid] => [edit_username] => [edit_dateline] => [edit_reason] => [hashistory] => [pagetext_html] => [hasimages] => [signatureparsed] => [sighasimages] => [sigpic] => [sigpicdateline] => [sigpicwidth] => [sigpicheight] => [postcount] => 9 [islastshown] => [isfirstshown] => [attachments] => [allattachments] => ) --> function resultHandler(result){ //Where I'd like my AS code to read the Array returned in the result and populate the DG. Right now I'm just using your sample Array //psuedo-code Array = result; Dataprovider = Array; login.txtUN.text=""; login.txtPW.text=""; } function doLogin(name:String,password:String):Void { auth.returningUserLogIn(name,password); } When the user enters their credentials, they will click on a login button. This will call the doLogin method which calls my Java method, which returns the results which populate the DG (eventually). What if I do not want to populate the DG when intialized but rather populate it after the user clicks on a button (ie, the Login button I just referenced above)?? Is there another DG attribute that I need to define to do this?? Thanks Tracy!! [allowsmilie] => 1 [showsignature] => 0 [ipaddress] => [iconid] => 0 [visible] => 1 [attach] => 0 [infraction] => 0 [reportthreadid] => 0 [isusenetpost] => 1 [msgid] => [ref] => [htmlstate] => on_nl2br [postusername] => agh1 [ip] => webforumsuser@m [isdeleted] => 0 [usergroupid] => [membergroupids] => [displaygroupid] => [password] => [passworddate] => [email] => [styleid] => [parentemail] => [homepage] => [icq] => [aim] => [yahoo] => [msn] => [skype] => [showvbcode] => [showbirthday] => [usertitle] => [customtitle] => [joindate] => [daysprune] => [lastvisit] => [lastactivity] => [lastpost] => [lastpostid] => [posts] => [reputation] => [reputationlevelid] => [timezoneoffset] => [pmpopup] => [avatarid] => [avatarrevision] => [profilepicrevision] => [sigpicrevision] => [options] => [akvbghsfs_optionsfield] => [birthday] => [birthday_search] => [maxposts] => [startofweek] => [referrerid] => [languageid] => [emailstamp] => [threadedmode] => [autosubscribe] => [pmtotal] => [pmunread] => [salt] => [ipoints] => [infractions] => [warnings] => [infractiongroupids] => [infractiongroupid] => [adminoptions] => [profilevisits] => [friendcount] => [friendreqcount] => [vmunreadcount] => [vmmoderatedcount] => [socgroupinvitecount] => [socgroupreqcount] => [pcunreadcount] => [pcmoderatedcount] => [gmmoderatedcount] => [assetposthash] => [fbuserid] => [fbjoindate] => [fbname] => [logintype] => [fbaccesstoken] => [newrepcount] => [vbseo_likes_in] => [vbseo_likes_out] => [vbseo_likes_unread] => [temp] => [field1] => [field2] => [field3] => [field4] => [field5] => [subfolders] => [pmfolders] => [buddylist] => [ignorelist] => [signature] => [searchprefs] => [rank] => [icontitle] => [iconpath] => [avatarpath] => [hascustomavatar] => 0 [avatardateline] => [avwidth] => [avheight] => [edit_userid] => [edit_username] => [edit_dateline] => [edit_reason] => [hashistory] => [pagetext_html] => [hasimages] => [signatureparsed] => [sighasimages] => [sigpic] => [sigpicdateline] => [sigpicwidth] => [sigpicheight] => [postcount] => 12 [islastshown] => [isfirstshown] => [attachments] => [allattachments] => ) --> Java Object Array to DataGrid - Macromedia Flex General Discussion

Java Object Array to DataGrid - Macromedia Flex General Discussion

Hello, I'm a FLEX newbee and have a quick question re: passing information back to my FLEX application from my existing JAVA classes. For testing, I created a simple Java class that returns an Object array of names and postions. I use the Remote Object syntax and return the result to an Array var within an ActionScript function. A couple of questions: - How do I cycle thru this data and add it to a datagrid? When I set the data provider attribute of the datagrid equal to the array nothing displays (I'm guessing this incorrect). What are the different ...

  1. #1

    Default Java Object Array to DataGrid

    Hello,

    I'm a FLEX newbee and have a quick question re: passing information back to my
    FLEX application from my existing JAVA classes. For testing, I created a
    simple Java class that returns an Object array of names and postions. I use
    the Remote Object syntax and return the result to an Array var within an
    ActionScript function. A couple of questions:


    - How do I cycle thru this data and add it to a datagrid? When I set the data
    provider attribute of the datagrid equal to the array nothing displays (I'm
    guessing this incorrect). What are the different ways to add information to
    the datagrid dynamically?

    - I know it would be more effective to create a data model but how do I get my
    information out of my java class and into a data model? (Stupid question but
    am really having trouble figuring this out)

    - Lastly, I've seen a lot of information on creating AS classes to mimic
    existing java classes when sending information but I haven't seen a lot on how
    to send custom Java Objects back to my Flex App.


    Again, I'm really new to this so ANY help you could give me or suggestions to
    my above questions would be great!

    Thanks in advance!
    Andy


    agh1 Guest

  2. #2

    Default Re: Java Object Array to DataGrid

    On your datagrid did you create DataGridColumns? these allow you to add
    columns and set the name of the attribute each datagrid column should map to.

    you might try a
    for(variableIterant in object){
    statement(s);
    }
    This can be found in the flex_aslr.pdf doent that's part of the Flex
    doentation. You should probably take a day or so and read the doentation.

    the java class if not registered to an actionscript class should come back as
    a dynamic object, meaning a base class object that you can then reference the
    properties via obj["propertyName"].

    To convert an actionscript class to a java class you need to do a bit of
    registering between the actionscript class and the java class as in
    class com.Product
    {
    public var id:Number;
    public var name:String;
    public var price:Number;
    public var description:String;
    public static var regClass = Object.registerClass("com.Product",
    com.Product);
    function Product()
    {
    }
    function toString()
    {
    return "id = " + id + " name = " + name + " price = $" + price;
    }
    }
    which i got again from the doentation this one is from the
    flex_dev_apps.pdf doent.page 679.



    bdeen Guest

  3. #3

    Default Re: Java Object Array to DataGrid

    Thanks for your response. I apologize, I'm still a little confused. Do I need
    to set up columns before I add rows to the datagrid or can I include that
    information when I set the dataProvider? The method of my class is simply
    returning an Object[] of information ( ie: Object[] o = {1,"test1",
    2,"test2"} ) -- a simple array. Here's what I'm attempting on the FLEX side:

    <!--Remote Object Definition-->
    <mx:RemoteObject id="test" source="package.SomeClass">
    <mx:method name="someMethod" result="resultHandler(event.result)"/>
    </mx:RemoteObject>

    <!--AS-->
    <mx:Script>
    var testArr:Array;
    function resultHandler(result){
    testArr=result;

    //first attempt - failed
    dataGrid.dataProvider = testArr;
    }
    </mx:Script>

    Second attempt. I tried to reference the array directly in the datagrid
    itself - failed. Do I need columns first (like you mentioned)??

    <mx:DataGrid id="dataGrid" dataProvider="{testArr}"></mx:DataGrid>

    Do I need to cycle thru my array and add the information to the DG row by row?
    Also, you mentioned that a "java class, if not registered to an actionscript
    class, should come back as a dynamic object" - does this mean that I simply
    need to import the proper package in my AS and instantiate accordingly?

    Again, thanks for your patience and help!


    agh1 Guest

  4. #4

    Default Re: Java Object Array to DataGrid

    *Both of your attempts are valid, and should work. I suspect your result is not
    exactly what you think.

    * For any thing but the simplest case, you should declare your dataGridColumns
    in the mxml. This will permit the use of a labelFunction if necessary

    * You should not have to iterate through your data unless you need to
    specially process it client-side.

    * use the mx.utils.ArrayUtils.toArray() function around your dataProvider.
    This fixes a problem with flex not knowing the difference between an object and
    an array with a single element.

    * for testing purposes, iterate through your result, either in a debugger or
    trace or alert in your result handler to be sure of what you have. Use the for
    ( i:Number = 0; i<array.length;i++) style. This will ensure you have a simple
    array. The for(var key in array) style would work on an object

    Tracy

    ntsiii Guest

  5. #5

    Default Re: Java Object Array to DataGrid

    Looking back, I think you do not have a simple array. I am not experienced
    with RemotObjects. The datagrid wants an array of objects:

    myArray[0] = {name:value,name2:value2...}
    myArray[1] = {name:value,name2:value2...}
    ...

    You might have to iterate through the object and build an array. Or, if you
    understand it(I don't), use bdeen's registration method.
    Tracy

    ntsiii Guest

  6. #6

    Default Re: Java Object Array to DataGrid

    Thanks for your response Tracy. Using your example, I tried the following but
    it's still not working:

    <!--AS-->

    var testArr:Array = new Array();
    var testArr2:Array = new Array();
    var counter:Number = 0;

    function resultHandler(result){
    //I'm returning a 3 element Object[]
    testArr=result;

    for (var i : Number = 0;i<testArr.length;i+=3){
    testArr2[counter] = [{FLD1:testArr, FLD2:testArr[i+1],
    FLD3:testArr[i+2]}];
    counter++;
    }
    }


    <!--MX-->

    <mx:DataGrid id="dataGrid2" dataProvider="{testArr2}">
    <mx:columns>
    <mx:Array>
    <mx:DataGridColumn columnName="FLD1" headerText="FLD1" width="220"/>
    <mx:DataGridColumn columnName="FLD2" headerText="FLD3" width="220"/>
    <mx:DataGridColumn columnName="FLD3" headerText="FLD3" width="220"/>
    </mx:Array>
    </mx:columns>
    </mx:DataGrid>

    Nothing populates in the DG. I tried to use a plain string with one element
    in it and that worked ..... I think I'm close! Any further assistance you
    could provide me would be great!! Thanks In advance for all of your help.

    Andy


    agh1 Guest

  7. #7

    Default Re: Java Object Array to DataGrid

    Second datagrid column is actually:

    <mx:DataGridColumn columnName="FLD2" headerText="FLD2" width="220"/>
    agh1 Guest

  8. #8

    Default Re: Java Object Array to DataGrid

    We need to know exactly what yo have in the result object, and we must be very
    clear on our terminology. An object array is not necessarily the same as an
    array of objects, which is what we want. In AS arrays are themselves objects,
    and objects can be treated lik arrays in some ways, so it is a bit messy.

    Do you know exatly what you have in result? What are you using for debugging?
    If you are using flex builder, you can put a break in the result handler and
    examine the structure of your object. Or use the net connection debugger, or
    something else.

    Do you know exactly what the structure is on the Java side?

    Also, be certain you have at more than one "row" in you result. We can handle
    a single row but need to do a little extra work.

    I am not a Java/RemoteObject guy, but the ideal structure would be something
    like this, in AS psuedo-code:

    class myObject
    var myItems:Array;
    myItems[0]= new Object({name:"Tracy",position:"developer"})
    myItems[1]= new Object({name:"Andy",position:"manager"})
    .....

    You see, we have an ordinary, numeric-element -identified array, full of
    Objects.

    For a dataProvider we might then have to specify {result.myItems}, which
    navigates us to the ordinary array containing the item objects. then the
    datGrid columns can eaqsily specify the property they need using:
    columnName="position", for example.


    Tracy


    ntsiii Guest

  9. #9

    Default Re: Java Object Array to DataGrid

    Hi Tracy,

    Thanks for the clarification. Yes, it looks like my Java class was returning
    and Object array not an Array of objects. I'm using FlexBuilder and alerts to
    debug. I decided to build a simple Array of Objects to just test that it
    works, I'm still not able to populate the DG. Here's what I tried:

    <!--AS-->
    var myItems:Array = new Array();
    function resultHandler(result){
    var test:Object = new Object({name:"Tracy",position:"developer"});
    var test2:Object = new Object({name:"Andy",position:"manager"});
    myItems[0] = test;
    myItems[1] = test2;
    }

    <!--MX code (DataGrid)-->
    <mx:DataGrid id="dataGrid2" dataProvider="{myItems}">
    <mx:columns>
    <mx:Array>
    <mx:DataGridColumn columnName="name" headerText="Name" width="220"/>
    <mx:DataGridColumn columnName="position" headerText="Position" width="220"/>
    </mx:Array>
    </mx:columns>
    </mx:DataGrid>

    I appreciate your help Tracy! Am I on the right track?
    Andy

    agh1 Guest

  10. #10

    Default Re: Java Object Array to DataGrid

    Very close. You are simulating the result event of a data service, but you are
    not actually calling that result handler function. In the sample app below, I
    used the initialize event on the datagrid to call the simulated result handler
    function.
    Tracy


    <?xml version="1.0" encoding="utf-8"?>
    <mx:Application xmlns:mx="http://www.macromedia.com/2003/mxml">

    <mx:Script><![CDATA[
    var myItems:Array = new Array();
    private function simulatedResultHandler():Void
    {
    myItems[0] = {name:"Tracy",position:"developer"};
    myItems[1] = {name:"Andy",position:"manager"};
    }
    ]]></mx:Script>

    <mx:DataGrid id="dataGrid2" dataProvider="{myItems}"
    initialize="simulatedResultHandler()">
    <mx:columns>
    <mx:Array>
    <mx:DataGridColumn columnName="name" headerText="Name" width="220"/>
    <mx:DataGridColumn columnName="position" headerText="Position" width="220"/>
    </mx:Array>
    </mx:columns>
    </mx:DataGrid>
    </mx:Application>

    ntsiii Guest

  11. #11

    Default Re: Java Object Array to DataGrid

    By the way, you should get the flashlog file working so you can use trace
    statements. Alerts are just barely ok, you will like tracing much better.

    Directions on how to do this are in the "Developing flex apps" doentation.
    Tracy

    ntsiii Guest

  12. #12

    Default Re: Java Object Array to DataGrid

    Your example worked great! I'm almost there! I'm sorry Tracy, I didn't
    include my remote object code definition that I reference:

    <!--Remote Object Definition -->
    <mx:RemoteObject id="auth" source="somePackage.Authenticate"> <mx:method
    name="returningUserLogIn" result="resultHandler(event.result)"/>
    </mx:RemoteObject>

    <!--AS -->
    function resultHandler(result){

    //Where I'd like my AS code to read the Array returned in the result and
    populate the DG. Right now I'm just using your sample Array

    //psuedo-code
    Array = result;
    Dataprovider = Array;

    login.txtUN.text="";
    login.txtPW.text="";
    }

    function doLogin(name:String,password:String):Void {
    auth.returningUserLogIn(name,password);
    }

    When the user enters their credentials, they will click on a login button.
    This will call the doLogin method which calls my Java method, which returns the
    results which populate the DG (eventually). What if I do not want to populate
    the DG when intialized but rather populate it after the user clicks on a button
    (ie, the Login button I just referenced above)?? Is there another DG attribute
    that I need to define to do this?? Thanks Tracy!!

    agh1 Guest

  13. #13

    Default Re: Java Object Array to DataGrid

    Hi Tracy, THANKS so much for your help! I was able to figure it out. I'm sure I'll have many more questions down the road ... thanks again for you patience!

    Andy
    agh1 Guest

  14. #14

    Default Re: Java Object Array to DataGrid

    What will happen is that your doLogin will make the RemoteObject call, which
    will then run the resultHandler when it returns.

    By the way, I believe you need to send() your RemoteObject request. I don't
    see you doing that. Are you sure you are getting a result event being fired?

    Don't focus on that sample app, it really just shows how to build and
    reference a dataProvider consisting of an array of objects.

    We are back at the point where we need to know exactly what is the structure
    of the data in the returned result object.

    Can you use the FlexBuilder debugger to examint that object once it gets into
    the resultHandler?

    Tracy

    ntsiii Guest

  15. #15

    Default Re: Java Object Array to DataGrid

    Ah, good, our posts just missed each other.

    Happy to help.

    Tracy
    ntsiii Guest

  16. #16

    Default Java Object Array to DataGrid

    I have similar question where the resultset from java is dynamic so the number of columns can vary. How to populate datagrid with this where java side returning something like List<List<Object>> or ArrayList<ArrayList<Object>> ?

    A concrete example on how to do this would be extremely helpful.
    Unregistered Guest

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