Java Development

[eraman]

hi, i want to hide some fields such as:-TextField,ButtonField,labelfield etc...on buton click.

For example: button1 and button2 are present in base class and after pressing button1 the control moves to next screeen where there are fields such as textfield & button ields which i want to hide and similarly when button2 is pressed the other fields should be visible and only few buttons should be hidden....

[simon_hain]

use delete or add to hide or show fields.

[eraman]

i have tried it already...................not working
i have tried these already..........
---------------------------------------------------------------------------------
---((TextField)name).getManager().delete(datetimefield);
---((ButtonField)selectfromMap).selectionDelete();
---selectfromMap.setEditable(false);
----------------------------------------------------------------------------------
these donot work at all....is there any other method??????

[simon_hain]

"not working" is a not a very good problem description.
usually you get an illegalstateexception when you try something wrong, and the detail message states clearly what is wrong, for example "field not child of this manager".

[eraman]

By "Not working" i mean that those fields are shown instead of deleting them...........no error at all in the code......
do u have any other solution to this problem?????

[simon_hain]

if you delete the correct reference the field will no longer be shown. i use this mechanism in a lot of cases and never had any problems.

[eraman]

let me give u an example.......
____________Class1___________
btn1 btn2
_____________________________

_____________class2__________

btn3----
textfield------

labelfield
btn4
---------------------------------------------------------

now when i click btn1....it will show btn3 & textfield
and when btn2 is pressed it will show label and btn4

hence i need to "-----HIDE----" two fields every time.
Now when i write the above techniques the all for fields are still shown together......this is the problem..........

[peter_strange · Accepted solution]

"I have tried these already..........
---------------------------------------------------------------------------------
---((TextField)name).getManager().delete(datetimefield);
---((ButtonField)selectfromMap).selectionDelete();
---selectfromMap.setEditable(false);
----------------------------------------------------------------------------------"

1) ((TextField)name).getManager().delete(datetimefield);

If you want to delete datetimefield, then the correct code would be:

datetimefield.getManager().delete(datetimefield);

2) (ButtonField)selectfromMap).selectionDelete();

SelectionDelete is intended to be used for Text Field where the user has selected a section of the Text.  As the documentation says:

"By default, this method does nothing; custom fields that support deletion operations must override this method"

ButtonField does not implement this.  By contrast, ActiveAutoTextEditField does.

3) selectfromMap.setEditable(false);

The documentation says:
"This method lets you change the style of this field by either adding, or removing, the Field.EDITABLE style."

So you can make the Field not editable, and it will look and behave differently, but not remove it.

In summary, the delete is the only option that will work, I suggest the reason it did not work for you was that you were not selecting the Field's manager correctly.

Edit:

I have not seen your latest post when I added the above.

In this case I suggest that you create a Manager that is added in the correct position, that, by default, does not contain any Fields.  When the appropriate Button is clicked, add the Fields you want to that Manager.  When the Fields should be deleted, use the Manager deleteAll() method to remove all the Fields you do not want to display.  That should work for you. 

[eraman]

the code successfully worked .............thanks  Simon_hain and Peter Strange

[simon_hain]

please mark the thread as solved, then.