从画布中删除图像 - fabricjs（javascript）

Question

I'm working on web application most of the part has been covered by angular js. I am stuck at a point. I used fabric.js to manipulate images on canvas and it is the best way of doing this. Everything is working fine but I can not add a close button on uploaded image like shown in image.

This angular image comes upon a canvas tag. Fabric.js gives me ability to rotate and add images but how could I close this particular image. So far I've done with the code is :

var canvas = window._canvas = new fabric.Canvas('c');

    var imgElement = document.getElementById('my-image');
    var imgInstance = new fabric.Image(imgElement);
    canvas.add(imgInstance);

My canvas element:

<canvas height="282" width="181" id="c" class="lower-canvas"></canvas>

My uploaded image element.

<img style="display: none;" src="http://*******/angular.png" class="topimg canvas-img" id="my-image">

Below is what I am getting from fabric.js

My question is, how could I close or remove this uploaded image on canvas ? Is there any another way to doing this instead of fabric.js ? If it is, please share.. I do not want to clear canvas element from common button. I need to remove image one by one.

Answer 1

Try this

$('#remove').click(function(){
    var object = canvas.getActiveObject();
    if (!object){
        alert('Please select the element to remove');
        return '';
    }
    canvas.remove(object);
});

Fiddle for remove object on button click

Fiddle with custom remove button on object

Answer 2

You can delete the selected object from the canvas when the user pressed DELETE with this code:

window.onkeydown = onKeyDownHandler;

function onKeyDownHandler(e) {
   switch (e.keyCode) {
      case 46: // delete
         var activeObject = canvas.getActiveObject();
         if (!activeObject) canvas.remove(activeObject);
   }
   e.preventDefault(); 
};

You can manipulate the controls from FabricJS, but it takes some effort. Checkout this question: Adding Custom Delete (Back,toFront) Button to Controls and this Fiddle: http://jsfiddle.net/86bTc/8/