https://designcdt.com/misc/textarea.js?d

1// $Id: textarea.js,v 1.22 2008/01/17 19:31:56 goba Exp $
2
3Drupal.behaviors.textarea = function(context) {
4  $('textarea.resizable:not(.textarea-processed)', context).each(function() {
5    // Avoid non-processed teasers.
6    if ($(this).is(('textarea.teaser:not(.teaser-processed)'))) {
7      return false;  
8    }
9    var textarea = $(this).addClass('textarea-processed'), staticOffset = null;
10
11    // When wrapping the text area, work around an IE margin bug.  See:
12    // http://jaspan.com/ie-inherited-margin-bug-form-elements-and-haslayout
13    $(this).wrap('<div class="resizable-textarea"><span></span></div>')
14      .parent().append($('<div class="grippie"></div>').mousedown(startDrag));
15
16    var grippie = $('div.grippie', $(this).parent())[0];
17    grippie.style.marginRight = (grippie.offsetWidth - $(this)[0].offsetWidth) +'px';
18
19    function startDrag(e) {
20      staticOffset = textarea.height() - e.pageY;
21      textarea.css('opacity', 0.25);
22      $(document).mousemove(performDrag).mouseup(endDrag);
23      return false;
24    }
25
26    function performDrag(e) {
27      textarea.height(Math.max(32, staticOffset + e.pageY) + 'px');
28      return false;
29    }
30
31    function endDrag(e) {
32      $(document).unbind("mousemove", performDrag).unbind("mouseup", endDrag);
33      textarea.css('opacity', 1);
34    }
35  });
36};