javascript - KineticJS - Cannot add dynamic object -


i need create kind of container manage dynamic actions kineticjs.

i have simple object able add circle using function.

here's code:

function stage() {     var self = this;      self.stage = new kinetic.stage({         container: "museummapcontainer",         width: 500,         height: 500     });      self.layer = new kinetic.layer();      self.addcircle = function (x,y) {         var circle = new kinetic.circle({             x: x,             y: y,             radius: 40,             fill: 'red',             stroke: 'black',             strokewidth: 4,             draggable: true         });          circle.on('mouseover', function() {             document.body.style.cursor = 'pointer';         });         circle.on('mouseout', function() {             document.body.style.cursor = 'default';         });         self.layer.add(circle);     }      self.stage.add(self.layer);  }  stage = new stage();  stage.addcircle(250,250);

normally, if don't put code inside function, can create circle without problems. however, code doesn't work , don't know why.

here's plunker: http://plnkr.co/edit/e1fbcfmezwgnakhsarhm?p=preview

there no errors in console , nothing showing , don't know why...

make sure layer.draw after creating new circles:

<!doctype html> <html>   <head> <script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v5.0.1.min.js"></script>   </head>   <body>     <h1>hello plunker!</h1>     <div id="museummapcontainer" style="width:500px;height:500px;border:1px solid black;"></div>          <script defer="defer">          function stage() {              var self = this;              self.stage = new kinetic.stage({                 container: "museummapcontainer",                 width: 500,                 height: 500             });              self.layer = new kinetic.layer();             self.stage.add(self.layer);              self.addcircle = function (x,y) {                 var circle = new kinetic.circle({                     x: x,                     y: y,                     radius: 40,                     fill: 'red',                     stroke: 'black',                     strokewidth: 4,                     draggable: true                 });                  circle.on('mouseover', function() {                     document.body.style.cursor = 'pointer';                 });                 circle.on('mouseout', function() {                     document.body.style.cursor = 'default';                 });                 self.layer.add(circle);                 self.layer.draw();             }         }          stage = new stage();          stage.addcircle(250,250);      </script>   </body> </html>

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