JSFiddle - React, Tailwind, and code Playground
HTML
<input type="file" onchange="mimi_handler(this.value);" />
JavaScript
mimi_handler = function(v){
var ext = v.substr(v.lastIndexOf('.') + 1);
alert(ext);
}
<input type="file" onchange="mimi_handler(this.value);" />
mimi_handler = function(v){
var ext = v.substr(v.lastIndexOf('.') + 1);
alert(ext);
}