I need to create a ComboBox in Java that will have information in a column on the left and a Checkbox in a column on the right so that a user can select multiple items in the ComboBox. This needs to be a ComboBox because there could be 100 items in the list that may need to be checked but they cannot take up much space on the user interface.
Does anyone know how to do this?
Using a JList inside a JScrollPane seems more appropriate for dealing with that many items. It supports the standard CTRL-click to select multiple items.
A multi-selection combobox with 100 items sounds like a UI nightmare.
Related
I connected MySql database with Java app, I see data from two different columns (Items, Price) but I want to connect them somehow, for example, if choose in first combobox item "Desk" the other combobox should automatic find "Desk" price and display it in second combobox. Anyone have idea how to make that ?
You could write a changelistener for the first box, then have it go into another sql query which will populate the second box. Check out this guide, it'll explain to you how to do it
https://docs.oracle.com/javase/tutorial/uiswing/events/changelistener.html
First, I think that you don't want to ComboBoxes being correlated in such a way. There must be a better design for your gui.
Is your ComboBox from JFace? There are JFace Data Bindings. Normally, you use them to automatically update your model if someone changes values in the user interface. If your model contains an id from your database, both comboboxes can have a binding to this id.
What are the differences between ComboBox and ChoiceBox in JavaFX? I'm not entirely clear on that just from the Javadoc for both classes.
At the end of the day, I need a dropdown control that can be repopulated dynamically at runtime (I've got a database on the backend). For all cases in my application, I only need to select one item from the dropdown menus. The user also shouldn't be able to add an option to the dropdown menu from the screens they are visible on.
My understanding is that ComboBox allows the user to add items to the dropdown list and allows for selecting multiple items, but from the Javadoc it seems like it's possible to setup ComboBox in a way that meets my needs, so it seems like they're interchangeable to some extent. I guess ComboBox has a bit more overhead than I really need in this case, but is there anything else that only a ComboBox could do that would factor into this decision?
Edit
I guess I kind of answered my own question on the key differences, so is there something else I've not mentioned that differentiates the 2?
ComboBox supports a cellFactory which allows essentially an arbitrary UI for displaying the item in each cell. ChoiceBox does not have this functionality and will only display text in each cell (which you can configure using a converter).
See http://docs.oracle.com/javase/8/javafx/user-interface-tutorial/combo-box.htm#BABJCCIB listing 16.5 for an example of a custom cell factory in a combo box.
Well ChoiceBox is of the idea showing you optional choices, and ComboBox well shows you a list of items, ChoiceBox is like ComboBox but ComboBox is for a really lengthy list as you can specify the number of items to display like 10 or more or less, but ChoiceBox does not have the option it list all options and if its very long you wouldn't like the look.
in short ChoiceBox, for small set of list less than 10, for more ComboBox
That is from my perspective the difference, as for styling you can style all.
Combo Box
A combo box is a typical element of a user interface that enables users to choose one of several options. A combo box is helpful when the number of items to show exceeds some limit, because it can add scrolling to the drop down list, unlike a choice box. If the number of items does not exceed a certain limit, developers can decide whether a combo box or a choice box better suits their needs.
Choice Box
This chapter describes choice boxes, the UI controls that provide support for quickly selecting between a few options.
http://docs.oracle.com/javafx/2/ui_controls/jfxpub-ui_controls.htm
We can simply differentiate ComboBox and ChoiceBox by their functionalities.Just have a look on deffintion.
The JavaFX ComboBox control enables users to choose an option from a predefined list of choices, or type in another value if none of the predefined choices matches what the user want to select.
The JavaFX ChoiceBox control enables users to choose an option from a predefined list of choices only.
Apart from the mentioned differences:
ComboBox can show a prompt with setPromptText (ChoiceBox doesn't provide that method)
ComboBox can show more than 10 rows with setVisibleRowCount (ChoiceBox doesn't provide that method)
I want to remove the scrollbar from the combobox and hence increase the height of the combobox when it is open. Meaning, i want to see all the items without scrolling.
Thanks!
If you don't want scrolling and the list options will remain few in number and relatively constant, you might actually want the ChoiceBox UI element. It has relatively the same function as the ComboBox without the scrolling capability.
...
choice boxes, the UI controls that provide support for quickly selecting between a few options.
Check out the Oracle docs on how to use them -- it's very similar to the ComboBox.
I am using a table to display data.
I am providing checkbox to each row of a table to perform some operations based on selection. When I did like that, I am able to check multiple rows.
But my requirement is, at any point of time I should check only one checkbox. To be precise, I need the behavior of Buttongroup to all checkboxes in table.
How can I do this?
If you really want to use checkboxes, I assume your TableModel holds a boolean for those checkboxes. It should be trivial to move the logic for the single selection to the TableModel.
If you do not need the checkboxes but just want to operate on the selected rows (see JTable#getSelectedRows), you can adjust the ListSelectionModel which is present on the JTable to only allow for single selection (see ListSelectionModel#SINGLE_SELECTION)
CheckOne is a complete example that simply clears all check boxes in a specific column and sets the new value. This related example uses JRadioButton.
I want to show all the categories in the database in each line of a JTable i have done that. Now when i click on the each row of JTable i need to show the list of products under it (considered as child of the category) as a drop down not as a drop down list which closes automatically when focus is lost, but it should stay there until i click on minimize icon in the same row. It is just like expanding content. so i can expand all categories individually. The working is similar to JTree but i need it in JTable so that i can show more information on each row in a proper format. Any ideas ?
You need TreeTable functionality. I bet this article will help you.
You will need to have the table model add/remove the subcategory rows when the button on the category is clicked.
You should look at NetBeans Outline. Here's an example that shows how it looks.