获取画布的活动元素不起作用

Question

how can i get active Object or Active Group in below Example ?? i am using this . in this fiddle i am trying to create curved text whenever text-box value is changed . i need to get active object of canvas to apply size and all changes but active group or element not working . how can i do this ?

Fiddle :: http://jsfiddle.net/NHs8t/8/

Below snippts of fiffle::

        var act = canvas.getActiveGroup();

        var obj = canvas.getActiveObject();
     if(!obj)
     {
        console.log('object not Selected');
     }else
     {
        console.log('Object  selected');
     }
     if (!canvas.getActiveGroup()) 
     {
        console.log('if part executed--object not selected');

        curvedText[cur] = new CurvedText(canvas, {});
        curvedText[cur].center();
        curvedText[cur].setText($(this).val());
        cur++;


    } else {
        console.log('Else part executed-object selected');
        act.setText($(this).val());

    }

Answer 1

getActiveGroup seems to be buggy. getActiveObject returns the active group though, so you can go with that. Problem is you won't have access to your setText method through the group, so you'll have to keep a reference to the CurvedText instance in the group:

function CurvedText( canvas, options ){

  ...

  this.group.curvedText = this;
}

and then

var act = canvas.getActiveObject();
act.curvedText.setText($(this).val());

like I did here .