Question

I have certain uploaded file code as following:

<script>
var input_file = document.getElementById('txt_list');
input_file.onchange = function() {
           var file = this.files[0];
           var reader = new FileReader();
           reader.onload = function(ev) {
                //myProcesses
           };
           reader.readAsText(file);
        };
</script>

How can I add new function to determine the type of uploaded file either txt, gif, etc? and if i have to validate it, what am i supposed to do then?
Thanks in advance

Answer 1

return (/[.]/.exec(filename)) ? /[^.]+$/.exec(filename) : undefined;

or

return filename.split('.').pop();

please refer this link for more details –LINK

if u need a txt file only

save it to a variable and use a if else statement to verify it

var file=file.split('.').pop();


if (type=='txt'){
//do something
}else{
//do something
}