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Drag the divider to increase/decrease the width of the left / right or top/bottom  area.

Posted on 2008-06-16
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Last Modified: 2012-05-05
I wanted to implement in java script a horizontal and vertical divider between the 2 windows (or divs) such that - once you drag the divider - it should increase/decrease the width of the left / right or top / bottom  area.

Say for example - in Lotus Notes client - there are 2 dividers 1 vertical and 1 horizontal - vertical divider separates the folder structure and the mails in that folder - and when this divider is dragged it increase / decreases the left and the right area.
Horizontal divider separates the mails and the contents of each mail.
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Question by:dnraj
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Accepted Solution

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Lolly-Ink earned 500 total points
ID: 21800639
This is a vertical splitter I implemented some time ago. It was made and tested for Internet Explorer only.
<html>
   <style>
      body
      {
         margin: 0;
         overflow: hidden;
      }
 
      div
      {
         height:  100%;
         overflow: auto;
      }
 
      div.left
      {
         background: gold;
         float:      left;
         width:      300px;
         clear:      left;
         cursor:     default;
      }
 
      div.right
      {
         background: salmon;
         float:      left;
         clear:      right;
         cursor:     default;
      }
 
      div.splitter
      {
         background: silver;
         width:      4px;
         cursor:     e-resize;
         float:      left;
      }
   </style>
 
   <script>
      var _divElement   = [];
      var _unselectable = [];
      var _cursor       = [];
      var _mouseDown    = false;
      var _x;
      var _xOriginal;
      var _widthSplitter;
 
      function init()
      {
         _divElement                        = document.getElementsByTagName("div");
         _x                                 = _divElement["divLeft"].style.width;
         _widthSplitter                     = _divElement["divSplitter"].style.width;
         var spanElement                    = document.getElementsByTagName("span");
         spanElement["spanLeft"].innerHTML  = "Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Curabitur blandit diam sed ante. Cras sollicitudin nisl et dolor. Quisque mattis dui vel diam faucibus varius. Curabitur eu sem. Praesent eu lectus non lacus pellentesque vehicula. Curabitur sed dui dapibus neque posuere mattis. Maecenas lorem diam, tempor eget, aliquam et, iaculis ac, odio. Praesent magna nulla, dignissim dictum, ultrices in, ullamcorper a, mi. In dictum gravida leo. Ut consequat, est non sollicitudin lacinia, enim justo aliquam sem, eget euismod sem erat nec ligula. Cras a metus. Pellentesque viverra. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Phasellus dictum molestie orci. Donec a odio. Phasellus pretium quam et eros. Duis nisi.";
         spanElement["spanRight"].innerHTML = spanElement["spanLeft"].innerHTML;
      }
 
      function mouseDown()
      {
         if (event.button == 1)
         {
            _mouseDown = true;
            _x         = event.x;
            _xOriginal = _x;
            for (var index = 0; index < document.all.length; index++)
            {
               _unselectable[index]             = document.all[index].unselectable;
               document.all[index].unselectable = "on";
 
               _cursor[index]                   = document.all[index].style.cursor;
               document.all[index].style.cursor = "e-resize";
            }
         }
      }
 
      function mouseMove()
      {
         if (_mouseDown && (_x != event.x))
         {
            _x = event.x;
            split(_x);
         }
      }
 
      function split(x)
      {
         _divElement["divLeft"].style.width  = x;
         _divElement["divRight"].style.width = document.body.clientWidth - x - _widthSplitter;
      }
 
      function cancelSplit(reset)
      {
         if (_mouseDown)
         {
            _mouseDown = false;
            if (reset)
            {
               split(_xOriginal);
            }
            for (var index = 0; index < document.all.length; index++)
            {
               document.all[index].unselectable = _unselectable[index];
               document.all[index].style.cursor = _cursor[index];
            }
         }
      }
 
      function keyDown()
      {
         if (event.keyCode == 27)
         {
            cancelSplit(true);
         }
      }
 
      function resize()
      {
         split(_x);
      }
   </script>
   <body onload="init()" onkeydown="keyDown()" onresize="resize()">
      <div id="divParent" onmousemove="mouseMove()" onmouseup="cancelSplit(false)" onmouseleave="cancelSplit(false)">
         <div id="divLeft" class="left">
            <span id="spanLeft"></span>
         </div>
         <div id="divRight" class="right">
            <div id="divSplitter" class="splitter" onmousedown="mouseDown()"></div>
            <span id="spanRight"></span>
         </div>
      </div>
   </body>
</html>

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Author Comment

by:dnraj
ID: 21892674
Thank you - I will be implementing it shortly
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Author Comment

by:dnraj
ID: 22259524
Thanks for the solution. It was helpful
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