Uncaught Type error: undefined is not a function while creating an object

Question

Base64.js

var Base64 = {
  _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
  encode: function(e) {
    var t = "";
    var n, r, i, s, o, u, a;
    var f = 0;
    e = Base64._utf8_encode(e);
    while (f < e.length) {
      n = e.charCodeAt(f++);
      r = e.charCodeAt(f++);
      i = e.charCodeAt(f++);
      s = n >> 2;
      o = (n & 3) << 4 | r >> 4;
      u = (r & 15) << 2 | i >> 6;
      a = i & 63;
      if (isNaN(r)) {
        u = a = 64
      } else if (isNaN(i)) {
        a = 64
      }
      t = t + this._keyStr.charAt(s) + this._keyStr.charAt(o) + this._keyStr.charAt(u) + this._keyStr.charAt(a)
    }
    return t
  }
}

I am calling encode method from another file like below had imported base64.js file and created object

Var base64=new Base64.encode(input);

Error:

Uncaught Type error: undefined is not a function

Can any one help?

Just a random guess, but how about var base64 = new Base64().encode(input)....? — Sylvan D Ash
– Sylvan D Ash, Commented Feb 24, 2017 at 9:46
Another Base64._utf8_encode(e); but _utf_encode is not defined — Rajesh Dixit
– Rajesh Dixit, Commented Feb 24, 2017 at 9:49
My intention here is wanted to call encode method from another Js file. — Madhu Nali
– Madhu Nali, Commented Feb 24, 2017 at 9:51

T.J. Crowder · Accepted Answer · 2017-02-24 10:07:05Z

1

Errors in your code:

Var should be var
_utf8_encode is not defined.
You are returning encoded string. You do not need to create object. Just do var encodedStr = Base64.encode(input)
In this line
```
t = t + this._keyStr.charAt(s) + this._keyStr.charAt(o) + this._keyStr.charAt(u) + this._keyStr.charAt(a)
```
in your original code, this refers to the object created by new, not Base64, so this._keyStr is undefined. But if you directly call Base64.encode() (#3 above), it will refer to Base64 and you will get proper values.

var Base64 = {
  _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
  encode: function(e) {
    var t = "";
    var n, r, i, s, o, u, a;
    var f = 0;
    e = Base64._utf8_encode(e);
    while (f < e.length) {
      n = e.charCodeAt(f++);
      r = e.charCodeAt(f++);
      i = e.charCodeAt(f++);
      s = n >> 2;
      o = (n & 3) << 4 | r >> 4;
      u = (r & 15) << 2 | i >> 6;
      a = i & 63;
      if (isNaN(r)) {
        u = a = 64
      } else if (isNaN(i)) {
        a = 64
      }
      t = t + this._keyStr.charAt(s) + this._keyStr.charAt(o) + this._keyStr.charAt(u) + this._keyStr.charAt(a)
    }
    return t
  },
  _utf8_encode: function(e) {
    // do your processing
    return e
  }
}

var input = "Hello World";
var base64 = Base64.encode(input);
console.log(base64)

Rectified JSFiddle

Note: I have defined _utf8_encode, but it returns same text. Please add necessary code.

edited Feb 24, 2017 at 10:07

T.J. Crowder

1.1m201 gold badges2k silver badges2k bronze badges

answered Feb 24, 2017 at 9:56

Rajesh Dixit

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5 Comments

T.J. Crowder Over a year ago

Got me again (on this). :-) My eyes are unhappy today. I was able to sneak in a ninja above, though. ;-)

Rajesh Dixit Over a year ago

Even I updated similar, but your version is better. Thanks :-)

T.J. Crowder Over a year ago

Yeah, sorry, I didn't get the "conflicting edit" notification. We were one second apart! :-)

Madhu Nali Over a year ago

Please let me know how I can call encode method from another Js file.....I have added all necessary imports like <script src="/base64.js> tag but when I am trying to call encode method getting error

Rajesh Dixit Over a year ago

@MadhuNali try logging Base64 in console. You will get entire thing. Then just do var output = Base64.encode(input)

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