Is it possible to alter the line that the user is currently on in

Question

Asked: May 21, 20262026-05-21T05:59:07+00:00 2026-05-21T05:59:07+00:00

Is it possible to alter the line that the user is currently on in a textarea, separate from any other line in the textarea? Image demonstration:

enter image description here

If it is possible, would you mind showing it to me on http://jsfiddle.net/ ?

Thanks in advance.

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Editorial Team · Answer 1 · 2026-05-21T05:59:08+00:00

Expanding on one of my previous answers, and borrowing code from this answer:

Live Demo (v0.2)

Only tested in FireFox 3.6.x
Requires the field_selection jQuery plugin (plain javascript code for caret position is a pain)
Matches lines that begin the same as the current line. (likely fixable)
If the cursor is on a completely blank line, it will not fade anything out. (likely fixable)
If the cursor is at the end of a line, it will fade everything out. (likely fixable)
Only triggers on keyboard actions (not mouse) (didn’t code this part yet, may not be possible)
Does not play nicely with the mouse. (due to z-index and focus)
~~Doesn’t work properly if there’s only 1 character on the line~~ (silly mistake on my part)

jQuery/JavaScript isn’t really my strong area, so if anybody can provide some fixes to get it working better, I’d really appreciate it. 🙂