I need an efficient (read native) way to convert an ArrayBuffer
to a base64 string which needs to be used on a multipart post.
You can derive a normal array from the ArrayBuffer
by using Array.prototype.slice
.
Use a function like Array.prototype.map
to convert bytes in to characters and join
them together to forma string.
function arrayBufferToBase64(ab){
var dView = new Uint8Array(ab); //Get a byte view
var arr = Array.prototype.slice.call(dView); //Create a normal array
var arr1 = arr.map(function(item){
return String.fromCharCode(item); //Convert
});
return window.btoa(arr1.join('')); //Form a string
}
This method is faster since there are no string concatenations running in it.