DIR : /home/kozerus/public_html/mousepos1.html

/home/kozerus/public_html

<!doctype html />
<html><head>
<!-- <script type="text/javascript" src="jquery.js"></script> -->
<script type="text/javascript">
  $(document).ready(
 function(){

var flip = document.getElementById('flip');
    var context = flip.getContext('2d');   
context.fillStyle = "rgb(255,255,255)";   
context.fillRect(0, 0, 500, 500);

      $("a").click(function(event){alert("Thanks for visiting!");});
   $("#flip").mousemove(function(event){
      var x, y;


    x = event.layerX;
    y = event.layerY;


    //alert("mouse pos"+event.layerX );
    var flip = document.getElementById('flip');
    var context = flip.getContext('2d');   
context.fillStyle = "rgb(255,0,0)";   
context.fillRect(x, y, 5, 5);
    }
   );
  }
  );    
  </script>
  </head>  <body bgcolor="#000000"> <a href="http://jquery.com/">jQuery</a><canvas id="flip" width="500" height="500">
  This text is displayed if your browser does not support HTML5 Canvas.</canvas> </body></html>

javascript html5 canvas
shareimprove this question
edited Dec 20 '13 at 6:31
CRABOLO
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asked Jan 31 '11 at 6:49
Bill Yan
1,83633 gold badges1919 silver badges3434 bronze badges

    4
    <!doctype html /> is invalid and invokes quirks mode, which changes the behaviour of a lot of DOM things! <!doctype html> is the correct DTD. – Delan Azabani Apr 22 '11 at 12:19

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3 Answers
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9

enter image description here

<!DOCTYPE html>

<html>
    <head>
        <meta charset = "utf-8">

        <script>
            Element.prototype.leftTopScreen = function () {
                var x = this.offsetLeft;
                var y = this.offsetTop;

                var element = this.offsetParent;

                while (element !== null) {
                    x = parseInt (x) + parseInt (element.offsetLeft);
                    y = parseInt (y) + parseInt (element.offsetTop);

                    element = element.offsetParent;
                }

                return new Array (x, y);
            }

            document.addEventListener ("DOMContentLoaded", function () {
                var flip = document.getElementById ("flip");

                var xy = flip.leftTopScreen ();

                var context = flip.getContext ("2d");

                context.fillStyle = "rgb(255,255,255)";   
                context.fillRect (0, 0, 500, 500);

                flip.addEventListener ("mousemove", function (event) {
                    var x = event.clientX;
                    var y = event.clientY;

                    context.fillStyle = "rgb(255, 0, 0)";  
                    context.fillRect (x - xy[0], y - xy[1], 5, 5);
                });
            });    
        </script>

        <style>
            #flip {
                border: 1px solid black;
                display: inline-block;

            }

            body {
                text-align: center;
            }
        </style>
    </head>

    <body>
        <canvas id = "flip" width = "500" height = "500">This text is displayed if your browser does not support HTML5 Canvas.</canvas>
    </body>
</html>
//


koh5_pano



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17.Aug.2010, Martin Wengenmayer