filereader check file type
var fileTypes = ['jpg', 'jpeg', 'png', 'what', 'ever', 'you', 'want']; //acceptable file types
function readURL(input) {
if (input.files && input.files[0]) {
var extension = input.files[0].name.split('.').pop().toLowerCase(), //file extension from input file
isSuccess = fileTypes.indexOf(extension) > -1; //is extension in acceptable types
if (isSuccess) { //yes
var reader = new FileReader();
reader.onload = function (e) {
alert('image has read completely!');
}
reader.readAsDataURL(input.files[0]);
}
else { //no
//warning
}
}
}