How “onrendered” is used in javascript?

Question

I have following code to take the screenshot of 'target' division. I found this on a website. But I do not know how " onrendered:function() " works. I want to ask how "onrendered" is used ? And what difference does it make if I do not add " onrendered : " ?

 $('#target').html2canvas({ onrendered: function (canvas) { var img = canvas.toDataURL("image/jpg"); } }); 

Answer 1

onrendered

Gets fired when the final canvas is done converting, and renders. So basically there's a very small amount of time between converting it from html to a canvas.

Here's some documentation I found about html2canvas.