how to encode image to base64 in javascript -

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in code below i'm fetching .txt file , getting encoded without giving error oi want use same thing , convert image basse 64

// adding attachment function opensavedialog() {   var nsifilepicker = components.interfaces.nsifilepicker;   var fp = components.classes["@mozilla.org/filepicker;1"].createinstance(nsifilepicker);   fp.init(window, "select file", nsifilepicker.modeopen);   fp.appendfilters(nsifilepicker.filterhtml | nsifilepicker.filterimages);   fp.appendfilters(nsifilepicker.filtertext | nsifilepicker.filterall);   var rv = fp.show();   if (rv == nsifilepicker.returnok || rv == nsifilepicker.returnreplace) {     var file = fp.file;     var path = "file://" + fp.file.path;     readtextfile(path);     document.getelementbyid('filename').value = file.leafname;   } }  // encoding text base64 function readtextfile(filepath) {   var rawfile = new xmlhttprequest();   rawfile.open("get", filepath, false);   rawfile.onreadystatechange = function() {     if (rawfile.readystate == 4) {       if (rawfile.status == 200 || rawfile.status == 0) {         var alltext = rawfile.responsetext;         alert(alltext);         encodedata = window.btoa(alltext);       }     }   };   rawfile.send(null); }


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