Show Or Hide Div Based On CSS Class

Question

I am trying to show or hide a div called "contact-form" on website based on another divs a css class, which is connected to whether a product is in or out of stock.

It needs to show the div if the class is "in-stock", and hide if it's class is "out-of-stock"

any ideas? struggling to figure it out!

<div id="contact-form"></div>

<p class="stock in-stock"></p> <!-- if product is in stock this shows-->

<p class="stock out-of-stock"></p> <!-- if out of stock this show-->

<script>

    if ('p.in-stock') {
        ('#contact-form').show();   
    }
    else {
        ('#contact-form').hide();
    }

</script>

Website is here - http://trent-art.co.uk/shop/barnes-david-still-life-of-flowers/ - out of stock product which needs the "submit best offer" button hiding if out of stock.

Answer 1

$('#contact-form').toggle($('p.stock').hasClass('in-stock'));

OR

if ($('p.stock').hasClass('in-stock')) {
    $('#contact-form').show();
} else {
    $('#contact-form').hide();
}

Answer 2

Since you didn't tag your question with jQuery , here is a vanilla JS alternative:

var formDiv = document.getElementById("contact-form");
var stockPara = document.getElementsByClassName("stock");
var sStockClass = stockPara[0].className;
formDiv.style.display = (sStockClass.indexOf("in-stock") < 0) ? "none" : "block";

This code could be shortened into fewer lines (technically, you could do it in one), but I left it broken up for clarity. The "consolidated" version would be:

document.getElementById("contact-form").style.display =
    (document.getElementsByClassName("stock")[0].className.indexOf("in-stock") < 0) ?
    "none" : "block";

If you're not familiar with ternary operators, that is what I used in the last line . . . it's basically a one-condition, two-option, one-line, if statement. The code says, "if 'in-stock' is in the sStockName string value, then assign 'block' as the display value, otherwise, use 'none'"

More info on ternaries here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_Operator

Answer 3

in pure Js it's:

var p= document.querySelector("p")

 if (p.className.match(/\bin-stock\b/)) {
document.querySelector("#contact-form").style.display = 'block';
}else{
document.querySelector("#contact-form").style.display = 'none';
}

fiddle

fiddle2 ---the one with display block---

Answer 4

if there is 1 contact form per product then put div of contact form inside product and hide with css :

.in-stock + .showOrHide
{
    display:block;
}

.sold + .showOrHide
{
    display:none;
} 

https://jsfiddle.net/o379yqy5/1/