Invalid character error while using atob() method

Question

I have read a question in stack overflow with this code work in IE 10 but not work in ie9,

but still i am facing issue on this.

var image = canvas.t         


        

Answer 1

1) your base64 encoded string probably is not fully valid. you can try to use this code instead of atob

var decodeBase64 = function(s) {
    var e={},i,b=0,c,x,l=0,a,r='',w=String.fromCharCode,L=s.length;
    var A="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    for(i=0;i<64;i++){e[A.charAt(i)]=i;}
    for(x=0;x<L;x++){
        c=e[s.charAt(x)];b=(b<<6)+c;l+=6;
        while(l>=8){((a=(b>>>(l-=8))&0xff)||(x<(L-2)))&&(r+=w(a));}
    }
    return r;
};

2) I think it should be image = image.replace(/^[^,]+,/, '');

3) As far as I know, support of the Blob in IE starts from version 10 - https://developer.mozilla.org/en-US/docs/Web/API/Blob

Answer 2

In case someone reachs this and the image = image.replace(/^[^,]+,/, ''); solution doesn't work for them, I got the same error calling atob function in IE11.

In my case, the error was caused because the base64 string had a carriage return each 76 characters.

This wasn't a problem for Chrome or Firefox, but IE11 produced the InvalidCharacterError.

b64Data = b64Data.replace(/\r\n/g, ''); solved my problem.