javascript - Hiding all elements with the same class name?

Question

I'm trying to hide elements with the same class name (float_form), but I'm also trying to use the script below to show them (all of the float_form class divs are initially hidden). I've looked at a lot of jquery solutions, but I can't seem to make any of them work for this.

function show(a) {
    var e = document.getElementById(a);
    if (!e) 
        return true;

    if (e.style.display == "none") {
        e.style.display = "block"
    } else {
        e.style.display = "none"
    }
    return true;
}
?

Edit: Sorry if it wasn't clear, I do not intend to use Jquery(and I know that this is not jquery). I am looking for a way to use javascript to recognize repeated classnames that are not in style= display:none; without compromising the show/hide ID element since there is a loop with the div id as the key. The html for the div looks like below, with {item.ID} being a while loop.

 <div class="float_form" id="{item.ID}" style="display: none;"> 

Answer 1

vanilla javascript

function toggle(className, displayState){
    var elements = document.getElementsByClassName(className)

    for (var i = 0; i < elements.length; i++){
        elements[i].style.display = displayState;
    }
}

toggle('float_form', 'block'); // Shows
toggle('float_form', 'none'); // hides

jQuery:

$('.float_form').show(); // Shows
$('.float_form').hide(); // hides