How to highlight the first line in the text area

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Can some one guide me how to highlight first line of the text area.

Thanks.

Posted 19-Mar-15 3:45am

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-03-19T05:50:00

This is done by a call to setSelectionRange:
https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement/setSelectionRange[^].

Solution 1 won't work due to some bugs, but some ideas are correct: first, you need to find out the end of the first line, either by splitting, or, simpler, by the search for nearest end-of-line position: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/search[^].
Then call

JavaScript

myTextArea.setSelectionRange(0, endOfFirstLine);

—SA