How to identify the type of a selected object?

问题

I am placing Text, Image and Shapes on canvas using Fabric.js. I have made Three different Edit-Panels for all three. When user select text I want to show text panel. like wise for image and shapes.

How to identify type of selected Object?

回答1:

canvas.getActiveObject().get('type') as simmi simmi said is correct. You can also listen to events:

function onObjectSelected(e) {
  console.log(e.target.get('type'));
}
canvas.on('object:selected', onObjectSelected);

回答2:

I solved this issue using following code::

  if(canvas.getActiveObject().get('type')==="text")
        {
            //Display text panel
            console.log('text panel Displayed');
            $("#Image_left_panel").css("display", "none");
            $("#shape_left_panel").css("display", "none");
            //$("#left_panel").css("display", "block");
        }
        else if(canvas.getActiveObject().get('type')==="Image")
        {
            //Display Image Panel
            console.log('Image Panel Displayed');
            $("#Image_left_panel").css("display", "block");
            $("#shape_left_panel").css("display", "none");
            $("#left_panel").css("display", "none");
        }
        else
        {

        }


        });

回答3:

Try isType()

Sample function for getting selected objects

function onObjectSelected(o){
    //activeObject = canvas.getActiveObject()
    activeObject = o.target;

    if(activeObject.isType('text')){
       //display text logic
    }
    else if(activeObject.isType('image')){
      //display image
    }
    else if( activeObject.isType('xyz')){
      //display shape logic
    }
}

canvas.on('object:selected', onObjectSelected);

回答4:

In fabricjs 3.4, to get the object type, just use:

var objType = canvas.getActiveObject().type;

On IText object, the above will return: i-text

On image, it will return: image

function onObjectSelected() { 
     // check if type is a property of active element
     var objType = (canvas.getActiveObject().type ? canvas.getActiveObject().type : "");
     // your code
}

canvas.on('object:selected', onObjectSelected);

来源：https://stackoverflow.com/questions/18893468/how-to-identify-the-type-of-a-selected-object

标签

javascript

jquery

html

canvas

fabricjs