I have written the following function which is meant to return promise
after the for-loop completes, but instead, it resolves straight away and
results returns as an empty array.
function fr(f, p) {
var deferred = $q.defer();
var promise = deferred.promise;
var results = [];
var callback = function(t, base64Img) {
var u = base64Img;
var c = f.data;
var diff = resemble(u).compareTo(c).onComplete(function(result) {
$log.debug('Comparing ' + t.name + ' with uploaded f');
t.result = result;
promise = promise.then(function() {
results.push(t);
});
});
};
for (var i = 0; i < p.length; i++) {
createBase64Property(p[i], callback);
}
deferred.resolve(results);
return promise.then(function() {
$log.debug(results);
return results;
});
}
function createBase64Property(t, callback, outputFormat) {
var img = new Image();
img.crossOrigin = 'Anonymous';
img.onload = function() {
var canvas = document.createElement('CANVAS');
var ctx = canvas.getContext('2d');
var dataURL;
canvas.height = this.height;
canvas.width = this.width;
ctx.drawImage(this, 0, 0);
dataURL = canvas.toDataURL(outputFormat);
callback(t, dataURL);
};
img.src = t.imageUrl;
if (img.complete || img.complete === undefined) {
img.src =
'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==';
img.src = t.imageUrl;
}
}
});
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