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How to change color of single line inside textarea using javafx controller

I have textarea which show file data content. I have table view which contains line numbers and when double click on table view I can able to retrieve line number so I need to change the color of particular line number in textarea using JavaFx controller. How to do that? Please share your code. Thanks.

Please provide some code.
With the TextArea UI-Control you can only add color to the whole containing text.
For your purpose you should use HTMLEditor to style your text content individually.
See also: Using JavaFX UI Controls - HTML Editor

Java GUI with scrolling text and images

How do I create a GUI with a scrolling text area and underneath small paragraphs of text there are corresponding images?
I am currently using a JTextArea with a scroll-bar to display the text and it works great, but I want to display the corresponding images underneath each small paragraph of text.

You can use javax.swing.JTextPane
Check TextSamplerDemo
You can find plenty of examples here:
http://www.java2s.com/Code/Java/Swing-JFC/TextPaneSample.htm

The easiest way to do this, would be to use JEditorPane with HTMLEditorKitYou can use HTML text formnatting including graphics, just like a webpage.

How to draw line in JTextArea and change color of a specific words

I'm currently developing JTextArea with a Notepad++ like function (currently indentation function finished).
Now I'm trying to add a function which in my JTextArea will show a dotted line for an indentation with same level, and change specific color of a word.
Thanks in advance :)

You will not able to achieve your target with JTextArea as it is a plain text support component.You have to use a Styled text supported JEditorPane or JTextPane.And try to use a HTML document and achieve it.Look at
Styled supported components
and
some more examples

Replacing smiles with images in Swing text area

I am designing a chat system..i am making use of JText area to display chat, and JTextField to enter text.
My question is how to recognize smiley's like ":)" and replace it by corresponding image
on text area? i found no method which will append image on text area..Please help.

http://java-sl.com/tip_autoreplace_smiles.html

You'll have to use a read-only JEditorPane to display HTML instead of a JTextArea in that case.

JTextArea was made to display only multiple rows of text, but correct me if I'm wrong. To display Images you could use the JEditorPane control that will allow you to use html, with simple <img /> tags which will point to a image.
Regarding how to recognize smileys you could create a file / list of common patterns that you would like to support and then simple check if the text contains the pattern with the .contains , or even Regular Expressions.
Update
And with the JEditorPane you will also be to do addition things like say scan for emails or links and automatically convert them so the user can click them, always a nice feature to have.

Scroll through JLabel held in JScrollPane

I have a JScrollPane that holds a JLabel using the following code:
//Create TEXT LOG JPanel
textLogPane = new JScrollPane(logLabel);
textLogPane.setPreferredSize(textLogPaneDim);
//textLogPane.setOpaque(true);
textLogPane.setBorder(BorderFactory.createLineBorder(Color.BLACK));
textLogPane.getViewport().setBackground(Color.DARK_GRAY);
The JLabel, logLabel, is represented by a string with an HTML encoding using for carriage returns. I display certain images based on the contents of certain lines and I would like to be able to scroll the JScrollPane, textLogPane, to show that line whenever I am displaying that graphic. I know the contents of the line that I want to display but I can't seem to figure out how to get it to scroll down(or up) to the relevant line.
If need be I can change to something other than a JLabel as long as I can keep the HTML encoding and have it look just like multiple lines of text.
Sorry if this is a repeat I tried searching but couldn't find any results.
Thanks

You can do some custom maths and use scrollRectToVisible() in your viewport. I don't know how to compute the rect of a specific line in your JLabel. A better solution would be to stick your strings into a JList instead, perhaps with a custom renderer for the html, and use
list.ensureIndexIsVisible(list.getSelectedIndex());

You don't use "carriage returns" in HTML, you use "br" tags.
I would suggest you should probably be using a JTextPane for multiline text. I also find it easier to not use HTML, but instead to add strings with attributes. You can also insert icons into a JTextPane.
Read the section from the Swing tutorial on Using Text Components for a working example.