How can I use JFormattedTextField with an editable JComboBox?
I know it is using internally an JTextField, but I only want it to accept numeric values with one decimal.
For this reason I want to use JFormattedTextField, but I´m not able to find the function in JComboBox to establish it.
Maybe this will point you in the right direction:
https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html#inputVerification
Related
I am using multiple JComboBox in a single JPanel. I was wondering what is the go to initial JComboBox selection text?
For example I can put "None" but that will seem as if some value is already selected in the JComboBox. I am using labels for which type of data they are so writing their type is unnecessary.
I can either put "" but something like "----" seems better. Is there a standard text when you want the user to select some value from JComboBox?
If you want to set an initial value to JComboBox that should be non-selectable (as soon as user selects another option, it will not be possible to select the initial one again), than it has been already answered here.
One way is to use a custom renderer. The renderer will simply display a default prompt when no item of the combo box has been selected.
Check out Combo Box Prompt for an example of this approach.
In NetBeans I've created a project with many of JTextField's. Now I understand that I should validate it. Is it possible to "cast" text fields to JFormattedTextField's?
It is possible to "cast" text fields to JFormattedTextField's?
No it's not. At least not directly. The other way around is possible though, given JFormattedTextField extends from JTextField.
So I must delete all JTexFields and add Formatted fields ?
Not necessarily but it's highly recommended. On the other hand you can let the class' variables declared as JTextField and initialize them as JFormattedTextField through custom code:
Then you can "safely" downcast them as JFormattedTextField later. However I'd like to emphasize one more time that it sounds like a dirty workaround. Also note you won't be able to change the setText(...) code to setValue(...) which is preferred for formatted text fields.
In Java, what is the difference between JTextField and JFormattedTextField ?
I mean when should I use JFormattedTextField instead of JTextField?
JFormattedTextField differs from JTextField in that it can support
locale-specific display
restrictions on its value
editing non-Strings [via setValue(Object)/getValue()]
incrementing/decrementing from the keyboard
To know more about it Click here and here
Have a look at the documentation for JFormattedTextField here, essentially it adds support for formatting arbitrary date values, so it'd would be beneficial when handling date entries
JTextField is used for plain text.
JFormattedTextField is a class that extends from JTextField and it is used to set any format to the text that it contains (in example, phone numbers, e-mails, dates, etc.).
If you don't need to set any special format to the textfield, it's recommendend to use JTextField.
How can I get the input for an editable JComboBox. When user gives an input to the combo how I can get the input text from it?
You need to get the edited text from the combobox editor via combo.getEditor().getItem().
If you need the text that is selected on a JComboBox and you are sure it's a String and not any other object, just use something like String text = (String)myCombobox.getSelectedItem().
If the thing you have in your Model is other than a String, then you need to cast it to the appropriate class, and then use the toString() method of that object.
If you need more help, you should paste a bit of your code, at least declaration and inicialization of your JComboBox...
Just have a look at the oracle tutorial. They do explain how to handle the common swing components http://docs.oracle.com/javase/tutorial/uiswing/components/combobox.html
can anyone help me with this , I have a jtable and I want to search for the data in it with jtextfield , as the user types, suggestions appears in a drop down list and select from it , then the user select it and the results appears in the table.
yes that possible two ways
1) easiest without implement for autocomplete JTextField,
- JTable has implemented Sorting and Filtering code example in the tutorial
2) by implement AutoComplete JComboBox / JTextField (read whole thread because there is most excelent alternative implemented in the SwingX) and for JTable to set Filtering
For the JTextField, use getText() to get the input(but you have to update that constantly). For the drop down menu, use what's called an editable combo box - http://docs.oracle.com/javase/tutorial/uiswing/components/combobox.html#editable has an explanation.