So far, I have a JTextArea and below the box, there is text (Character count:) using BorderFactory. I am retrieving String.length() from the textbox to display character count but it's not dynamic.
Could someone please provide advice or code example as to how to implement addListeners in this situation?
So far, I have a JTextBox
There is no such component. I assume you mean JTextField. Be explicit when you ask a question. We should not have to guess what you are talking about.
but it's not dynamic.
Use a DocumentListener. Check out the section from the Swing tutorial on How to Write a DocumentListener for more information and working examples.
Related
I'm working on one of my first java applets and I want to start of fairly simple (though I have a good understanding of how code works I dont know much in terms of what methods I all have at my disposal when using java)
I have created a Jframe window that has a JTextarea in it. I would like to execute certain lines of code when certain things are typed into this box. In essence, its a simple text input system. How would I go about doing this or is there a better component to use for this?
in addition to getText(), for JTextField some prefer the getDocument() method. In Java, Listeners are used to capture events, such as "what was typed to the text area". This tutorial will get you started, if you have trouble implementing you can come back with a more specfic question and some code :)
At the moment I try to find a method to create a TextArea that I can edit and simply (without cheating) apply syntax highlighting to. Is that possible without the need of a custom Component? I already managed to format a text using a JEditorPane, but I am not sure how to implement that the text is dynamicly highlighted... And that efficiently. Is that possibly without an enormous amount of coding?
You can't use a JTextArea since it does not support text attributes.
Instead you can use a JTextPane. Read the section from the Swing tutorial on Text Component Features for more information and examples.
I want to change color of text written in JTextArea. For e.g. I am pasting Java code in JTextArea.
I want to give the different-2 color to Java keywords, variables and classes written in code.
Is it possible?
See Rob Camick's Message Console. It seems perfect for this use case.
Actually '2 color' might not be enough for this.
See How to Use Editor Panes and Text Panes for more details on the formatted text components that might replace JTextArea.
it's not possible
if you want to set different colors in the same area, i think JTextPane could help you
i'm not sure how to use that, but i found this
http://docs.oracle.com/javase/tutorial/uiswing/components/editorpane.html
I have an application with basic chat. I use JTextArea for the buffer. After adding a message I want to scroll to the bottom. How can this be achieved?
I found no member function that would allow me to do this.
You can do this by setting the caret position to the end of the text area, i.e.,
myTextArea.setCaretPosition(myTextArea.getDocument().getLength());
Edit: you can find out a lot more on this question by looking at the related questions listed on the lower right of this page. In particular, please check out camickr's answer and link in this thread: How to set AUTO-SCROLLING of JTextArea in Java GUI?. It's a far better and more complete answer than the one I've given (and I've just now up-voted it for this).
I want to load up a window using the java swing, something like this
However I want to be able to use it for text input also not just to dump data into it..
any idea how to do it?
JTextAreas are editable by default, so input is trivial. Just put one into a test UI and see for yourself.
From a design perspective, using the same JTextArea for both input and output strikes me as unwise. The only example I can think of is a shell interface, and that imposes stronger limits on how input and output works than a JTextArea will provide out of the box.
I'm not sure if I got the point of your question, but you can get the text the user has typed in using the getText() method:
JTextArea ta = new JTextArea();
String input = ta.getText();
Check out this Sun toturial:
http://java.sun.com/docs/books/tutorial/uiswing/components/textarea.html
In particular, scroll down to the "TextAreaDemo" example.