Drag and drop a canvas like an image - javascript

Our company's website uses canvas elements to render graphs and charts on our pages. However, these cannot be drag-and-dropped into, say, a Microsoft Word Document or an email client. So I devised a way to replace the canvas with an identical-looking img on mouse down, by getting the base64 data from the canvas.
The canvas is properly replaced by an image on mousedown, and placed back on mouseup. However, this does not allow dragging and dropping the image tag, probably because the replacement happens too late.
Here is a working JSFiddle example.
We use a plugin which also provides tooltips to specific areas of the charts, so I cannot replace the elements on hover in/hover out, as that would stop the tooltips from working.
How do I make dragging and dropping the image itself possible?

Prebuild your img elements at the start of your app instead of taking the time to do it "on-the-fly".
Create your charts using in-memory canvases:
var canvas1=document.createElement('canvas');
// draw your chart on canvas1
Then create img elements from the canvases
var chart1=new Image();
document.body.appendChild(chart1);
chart1.src=canvas1.toDataURL();

your code is working correctly but you can't drop the image onto word because IMO the image is base64, you'll see that if you drag and drop the image onto a new tab in the browser or add a css border or the image id
The Image:
data:image/png;base64,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
If you copy the above base64 code and paste it in the browser address bar it will render just fine, but if you do the same in word it won't work, so you need to decode the image first before showing it on mouse down
for more information:
Base64 encoding / decoding with javascript
Base64 encoding and decoding in client-side Javascript
Edit:
You can right click on the canvas and then save image as, thus it will be saved as an image file

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My issue:
I'm using clearRect() function for clearing the canvas. And again re-draws all images. Is it necessary that each time I re-draw the entire content ? Is there any option to re-draw that particular area ?
When I used the clearRect() to clear the exact area of that object. The background image also got removed. Is there any way to save the particular portion of background image and draw that portion with this saved image ? (Because my objects are moving on the canvas, I need to retreive the image data dynamically)
I'm new to WebTechnology and HTML 5. So please help me. Thanks in advance
There are a few canvas layer libraries that adds support for the layers:
CanvasLayers
CanvasStack
Think of the canvas as a painting, it is not possible to remove a "layer" of content once it has been applied. You can specify a portion of the canvas to clear using clearRect(x,y,height,width), but you will always need to redraw the background of what you deleted. The drawImage() function takes arguments to draw a specific portion of an image in a specific location, but perhaps more along the lines of what you are looking to use is imageData.
I suggest you do some reading up on the canvas here Mozilla Dev Network: Canvas

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