Semantic UI full width menu dropdown - html

Question

How is it possible to create a menu with full width dropdown items (mega menu)?
I'm trying to build a menu like this example
I have tried to utilize Semantic UIs popups, but this only works for the first menu item (Error: "Popup does not fit within the boundaries of the viewport").
I would prefeer a solution using dropdowns instead, but they are don't use the full width of the screen.
$('#menu1')
.popup({
popup: '#menucontent1',
hoverable: true
});
$('#menu2')
.popup({
popup: '#menucontent2',
hoverable: true
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/2.2.2/semantic.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/2.2.2/semantic.min.js"></script>
<div class="ui secondary pointing menu">
<a class="browse item" id="menu1">
Item 1</a>
<a class="browse item" id="menu2">
Item 2</a>
</div>
<div class="ui fluid popup bottom left transition hidden" id="menucontent1">
<div class="ui four column relaxed equal height divided grid">
<div class="column">
<h4 class="ui header">Fabrics</h4>
<div class="ui link list">
<a class="item">Viscose</a>
</div>
<h4 class="ui header">Fabrics Level 2</h4>
<div class="ui link list">
<a class="item">Cashmere</a>
<a class="item">Linen</a>
<a class="item">Cotton</a>
</div>
</div>
<div class="column">
<h4 class="ui header">Size</h4>
<div class="ui link list">
<a class="item">Small</a>
<a class="item">Medium</a>
<a class="item">Large</a>
<a class="item">Plus Sizes</a>
</div>
</div>
<div class="column">
<h4 class="ui header">Colored</h4>
<div class="ui link list">
<a class="item">Neutrals</a>
<a class="item">Brights</a>
<a class="item">Pastels</a>
</div>
</div>
<div class="column">
<h4 class="ui header">Types</h4>
<div class="ui link list">
<a class="item">Knitwear</a>
<a class="item">Outerwear</a>
<a class="item">Pants</a>
<a class="item">Shoes</a>
</div>
</div>
</div>
</div>
<div class="ui fluid popup bottom left transition hidden" id="menucontent2">
<div class="ui four column relaxed equal height divided grid">
<div class="column">
<h4 class="ui header">Fabrics</h4>
</div>
<div class="column">
</div>
<div class="column">
</div>
<div class="column">
</div>
</div>
</div>

Answer 1

you don't need jQuery for that, not even javascript:
I made a small Fiddle for it:
<div class="ui secondary pointing menu">
<ul class="menu">
<li>
<a class="browse item" id="menu1" data-target="#menucontent1">
Item 1</a>
<div class="popup" id="menucontent1">
<div class="ui four column relaxed equal height divided grid">
<div class="column">
<h4 class="ui header">Fabrics</h4>
<div class="ui link list">
<a class="item">Viscose</a>
</div>
<h4 class="ui header">Fabrics Level 2</h4>
<div class="ui link list">
<a class="item">Cashmere</a>
<a class="item">Linen</a>
<a class="item">Cotton</a>
</div>
</div>
<div class="column">
<h4 class="ui header">Size</h4>
<div class="ui link list">
<a class="item">Small</a>
<a class="item">Medium</a>
<a class="item">Large</a>
<a class="item">Plus Sizes</a>
</div>
</div>
<div class="column">
<h4 class="ui header">Colored</h4>
<div class="ui link list">
<a class="item">Neutrals</a>
<a class="item">Brights</a>
<a class="item">Pastels</a>
</div>
</div>
<div class="column">
<h4 class="ui header">Types</h4>
<div class="ui link list">
<a class="item">Knitwear</a>
<a class="item">Outerwear</a>
<a class="item">Pants</a>
<a class="item">Shoes</a>
</div>
</div>
</div>
</div>
</li>
<li>
<a class="browse item" id="menu2" data-target="#menucontent2">
Item 2</a>
<div class="popup" id="menucontent2">
<div class="ui four column relaxed equal height divided grid">
<div class="column">
<h4 class="ui header">Fabrics</h4>
</div>
<div class="column">
</div>
<div class="column">
</div>
<div class="column">
</div>
</div>
</div>
</li>
</ul>
</div>
and the css:
.menu {
list-style: none;
}
.menu li {
float: left;
margin-right: 1em;
}
.popup {
background-color: #fff;
position: absolute;
border-radius: 5px;
border: 1px solid grey;
left: 0;
right: 0;
opacity: 0;
transition: opacity 0.5s ease;
padding: 1em;
}
.item:hover~div {
opacity: 1;
}