JSFiddle - React, Tailwind, and code Playground

by Pavlo

HTML

<form id="formid" action="" method="post" onsubmit="return validateInputs()" >
    <input name="profile_photo[]" type="file"  value="" />
    <input name="profile_photo[]" type="file"  value="" />
    <input name="profile_photo[]" type="file"  value="" />
    <input type="submit" />
    <br/>
</form>

JavaScript

validateInputs = function() {    
    inputs = document.getElementsByName('profile_photo[]');
    for (var ind in inputs){
        if (inputs[ind].value=="") {
            alert("validation failed");
            return false;
        }
    }         
}