Question

57

Finding number of lines in an html textarea

rated 0 times [ 64] [ 7] / answers: 1 / hits: 34324 / 14 Years ago, sun, september 12, 2010, 12:00:00

I'm writing a mobile web application where scrollbars are not displayed on the device's browser. Due to this, I'm trying to dynamically modify the height of the textarea to make it bigger, however I don't know of any way to actually get the line count on an html textarea. Any help would be greatly appreciated!

EDIT

So I realize now that it's not newlines per se, but actual line wrapping. So when one line finishes it wraps the text to the next line. It appears as if it is a new line. Any way to count the number of these? Thanks!

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ellisw

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answered 14 Years ago jaden · Accepted Answer

I haven't tried using the function discussed in this blog, but you may find it useful.

http://kirblog.idetalk.com/2010/03/calculating-cursor-position-in-textarea.html

Basically, if you create a div and then copy the text into that div, with the same width and font characteristics, you can then get the information you need, such as the number of lines. The number of lines in this example would be easy, in that if you know how many pixels high a single line would be, then just find the width of the test div and you can get a pretty accurate idea as to how many lines are in your textarea.