Convert binary data to base64 with javascript

Question

HTML5 enable you to store data locally which I think it is great. For example here is how you can use it:

        var store = window.localStorage;         store.setItem('foo', "hellow world");         var test = store.getItem('foo');         // test should = "hellow world" 

In html you can dynamically display an image by settig its source to:

     "data:image/jpg;base64," + (base64string) 

So my question is how can I convert binary data to a base64 string so that I can take advantage of html5 local storage?

For example it will be great if I could:

$.ajax({    url: 'someImage.png',    type: 'POST',    success: function (r) {                  // here I want to convert r to a base64 string !                 // r is not binary so maybe I have to use a different approach                 var data = ConvertToBase64(r);                    document.getElementById("img").src = "data:image/png;base64," + data;             }, }); 

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I know I could solve this problem by wrapping the image around a canvas using html5 then converting that to base64string. also I can make a specific service on the server that will send a base64 string data of that image (someImage.aspx).I just want to know if it will by possible to retrieve binary data from a server and convert that to a base64 string.

Answer 1

To prevent 'InvalidCharacterError' error, you need to do this:

var base64EncodedStr = btoa(unescape(encodeURIComponent(rawData)));