Events and cursor position

Question

Events and cursor position

I want to show the coordinates of the mouse until the cursor is over the red div and the mouse button is there.

The problem is that I unlock the button outside the div and put the cursor back into the div, the onmousemove event is not deleted.

NOTE. I do not want to use any library like jQuery.

        <script type="text/javascript">

              window.onload = function(){

      document.getElementById("thediv").onmousedown = AttachEvent;

     }
            function GetPos(e){                                
                document.getElementById('X').value = (window.Event) ? e.pageX : event.clientX + (document.documentElement.scrollLeft ? document.documentElement.scrollLeft : document.body.scrollLeft);
                document.getElementById('Y').value = (window.Event) ? e.pageY : event.clientY + (document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop);

            }

            function UnaatachEvent(e){
                document.getElementById("thediv").onmousemove = null;
                document.getElementById("thediv").onmouseup = null;
            }

            function AttachEvent(e){
                document.getElementById("thediv").onmousemove = GetPos;
                document.getElementById("thediv").onmouseup = UnaatachEvent;
            }
        </script>
    </head>
    <body>
        <input type="text" id="X" size="3">X-position
        <br/>
        <br/>
        <input type="text" id="Y" size="3">Y-position 
        <div style="width:100px;height:100px;background-color:red;margin:auto;" id="thediv">
        </div>
    </body>

UPDATE:
With jQuery it is very simple: (tested only in Firefox) link text

$(document).ready(function(){

    $('#thediv').mousedown(attachEvent);
  });  
function attachEvent(e){
       $('#thediv').mousemove(getPos).mouseup(unattachEvent);

      return false;
}

function getPos(e){

  document.getElementById('X').value = e.pageX;
  document.getElementById('Y').value = e.pageY;            
 return false;
}

function unattachEvent(e){
   $('#thediv').unbind("mousemove", getPos).unbind("mouseup", unattachEvent);

Pay attention to the main scenarios:

If the button was pressed outside the square, and while holding it, moved to suqre - do not update the position.
If the button was pressed inside the square, and while holding, go to the street - stop updating, return it (without releasing the button) continue updating

, mousedown .

javascript.

+3

javascript html

jullin 06 . '10 11:09

1

galambalazs · Accepted Answer · 2010-11-06T11:21:43+0000

( )

var div = document.getElementById("thediv");
div.onmousedown = attachEvent;

// if mouse released, stop watching mouseover
document.onmouseup = function () {
  div.onmouseover = null;
}

function attachEvent() {
  this.onmousemove = getPos;
  this.onmouseout  = unattachEvent;
  this.onmouseup   = unattachEvent;
  return false; // prevent Firefox "drag behavior"
}

function unattachEvent() {
  this.onmousemove = null;
  this.onmouseup   = null;
  this.onmouseout  = null;
  // wait for the mouse to come back
  this.onmouseover = attachEvent;
}

function getPos(e) {
  e = e || window.event;
  var docEl = document.documentElement;
  var scrollLeft = docEl.scrollLeft || document.body.scrollLeft;
  var scrollTop  = docEl.scrollTop || document.body.scrollTop;
  document.getElementById('X').value = e.pageX || (e.clientX  + scrollLeft);
  document.getElementById('Y').value = e.pageY || (e.clientY  + scrollTop);
}

Events and cursor position

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