JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" id="site1" name="site1" value="site1" onclick="changeSite(this);">Site1<br>
<input type="checkbox" id="site2" name="site2" value="site2" onclick="changeSite(this);">Site2<br>
<input name="submit" value="open it up!" type="button" onclick="validate()">
<div id="newLink"></div>

JavaScript

window.validate= function() {
    $(":checkbox:checked").each(function() {
        var sitename = $(this).val();
        window.open('http://www.' + sitename + '.com');
    });
    return false;
}

window.changeSite= function(obj){
   var site = $(obj).val();
    $("#selectedSite").attr("href",site);
    $("#selectedSite").html(site);
    if($(obj).prop("checked")){
        $("<a/>",{
            id: site+"Test",
            href:site,
            html: site
        }).appendTo("#newLink");
    }
    else{
        $("#"+site + "Test").remove();
    }
    
    
}