JSFiddle - React, Tailwind, and code Playground

by Trisox

HTML

<form id="contactForm">
    <input type="text" value="" id="username"/>
    <input type="button" value="submit" id="submit"/>
</form>

JavaScript

$('#submit').click(function() {
    var arr = [ "/","\\",'"',"'" ];
    var username = $('#username').val();
    $.each(arr, function(index, char) {
        if(username.indexOf(char)>-1) {
            alert('noooOOoooppp!');
            return false;
        }
            console.log(username);
    });
    return false;
});