Uncaught TypeError: Cannot read property 'getContext' of null

[pdfjs...@gmail.com]

I have a button which on click executes this function.This code is to draw a line on canvas element on which PDF file gets rendered on a webpage by using PDF.JS. But i get an error "Uncaught TypeError: Cannot read property 'getContext' of null". What should i do.

function abc()
{
alert("msg");
var c=document.getElementById("canvas1");
alert(c);
var ctx= c.getContext('2d');
alert(ctx);
ctx.beginPath();
ctx.moveTo(0,0);
ctx.lineTo(300,150);
ctx.stroke();
}

[Brendan Dahl]

I’m not sure if you’re using our viewer or one of your own, but the viewer in pdf.js has canvas with ids like ‘page1’ not ‘canvas1’.

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