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hover over text to show some other text

I'm having a hardtime to find out how to make a hover effect to show some other text/buttons. i want to make a sort of nav menu with hovers.
please see the picture for more information;
when you hover to "platenwarmtewisselaar" i want to make a drop down menu over the picture. and when you go to "buizenwarmtewisselaar"or the other text/buttons there will a couple of other options to chose from. how can i insert this into my code?
many thanks!
My code;
<div id="knoppen">
<div id="Plaat" onclick="URL" onmouseover="ShowP()">
<button id="plaatknop">Platenwarmtewisselaar </button>
</div>
<div id="buis">
<button id="buisknop" onclick="URL"onmouseover="ShowB()">Buizenwarmtewisselaar</button>
</div>
<div id="productenplaat">
<div id="gelast">
<button id="gelastknop">Gelasteplatenwisselaar </button>
</div>
<div id="gesoldeerdplaat">
<button id="gesoldeerdknop">gesoldeerde platenwisselaar</button>
</div>
<div id="pakkingenplaat">
<button id="pakkingenknop">platenwisselaar met pakkingen</button>
</div>
</div>

You can use like below code
#menu {
width: 150px;
height: 100%;
background: #424242;
color: white;
float: left;
}
#menu ul {
margin: 0;
padding: 0;
}
#menu li {
list-style: none;
font-size: 20px;
padding: 15px 20px;
cursor: pointer;
}
#menu li:hover {
background-color: #90CAF9;
}
#menu li.active {
background-color: #2196F3;
}
#menu ul li ul {
display: none;
}
#menu ul li.submenu {
position: relative
}
#menu ul li.submenu ul {
position: absolute;
left: 150px;
width: 200px;
top: 0;
background: #333
}
#menu ul li.submenu:hover ul {
display: inline-block
}
<div id="menu">
<ul>
<li onClick="Dashboard();">Platenwarmtewisselaar </li>
<li class="submenu">Buizenwarmtewisselaar >
<ul>
<li>Add Employee</li>
<li>Employee View</li>
</ul>
</li>
<li>Gelasteplatenwisselaar </li>
<li class="submenu">Salary
<ul>
<li>Add Employee</li>
<li>Employee View</li>
</ul>
</li>
<li>Change Password</li>
</ul>
</div>

I'm not sure, but are you talking about this dropdown menu? If so, you can follow the guidelines here.
https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_js_dropdown_hover

.addClass when #mainNav :visible

Desired:
When menu button is clicked and navigation(#mainNav) slides in, check to see if visible. If so, .addClass .is-open to .nav-item. When navigation (#mainNav) is closed, .removeClass .is-open from .nav-item.
Issue:
Class is not being added to .nav-item when navigation is visible(Slides).
HTML
<header>
<!-- Logo and Burger -->
<div class="brand-wrap">
<div class="trigger-wrapper">
<button id="burger">
<div class="nav-trigger-line"></div>
<div class="nav-trigger-line"></div>
<div class="nav-trigger-line"></div>
</button>
</div>
</div>
<!-- End of Logo and Burger -->
<!-- Navigation -->
<nav id="mainNav" class="navbar main-nav">
<div class="nav-container">
<ul class="nav flex-column">
<li class="nav-item">
<span class="nav-number">01.</span><br>Our Company
</li>
<li class="nav-item">
<span class="nav-number">02.</span><br>Our People
</li>
<li class="nav-item">
<a href="services.html" class="nav-link">
<span class="nav-number">03.</span>
<br>Services</a>
</li>
<li class="nav-item">
<span class="nav-number">04.</span><br>Careers
</li>
<li class="nav-item">
<span class="nav-number">05.</span><br>Contact Us
</li>
</ul>
</div>
</nav>
<!-- End of Navigation -->
</header>
CSS
.brand-wrap {
position: fixed;
top: 20px;
right: 20px;
z-index: 999;
}
#burger {
float: right;
margin: 0;
}
.trigger-wrapper {
position: absolute;
right: 5px;
}
.main-nav a {
text-decoration: none;
}
.main-nav {
display: none;
position: fixed;
top: 0;
left: 0;
width: 100vw;
height: 100vh;
background-color: rgba(35, 31, 32, 1);
}
.nav-container {
margin-top: 80px;
}
.nav-link {
color: #fff;
font-size: 1.5em;
font-weight: 800;
padding: .25em 1em;
}
.nav-link:hover {
color: #82bc00;
}
.nav-number {
font-size: .5em;
font-weight: 600;
}
.nav-trigger-line {
height: 3px;
width: 30px;
background-color: #fff;
margin: 6px auto;
}
JS
// Menu click function
$('#burger').click(function() {
$('#mainNav').toggle();
});
// Check if Nav is visible
if ($('#mainNav').is(':visible')) {
$(".nav-container .nav .nav-item").addClass("is-open");
} else {
$(".nav-container .nav .nav-item").removeClass("is-open");
}
jsfiddle: https://jsfiddle.net/WeebleWobb/auszo29m/2/

You need to send it inside the event handler:
// Menu click function
$('#burger').click(function() {
$('#mainNav').toggle(function () {
// Check if Nav is visible
if ($('#mainNav').is(':visible')) {
$(".nav-container .nav .nav-item").addClass("is-open");
} else {
$(".nav-container .nav .nav-item").removeClass("is-open");
}
});
});
The best thing you can do is, you should put it inside the callback function like above.

Show elements on click instead of on CSS :hover

Currently I use :hover in my CSS to display my nested lists in .wrapper1 elements. I want to make it so that they open on click instead of on hover.
Here is what I've tried so far:
$(function() {
// whenever we hover over a menu item that has a submenu
$('li.parent').on('click', function() {
var $menuItem = $(this),
$submenuWrapper = $('> .wrapper', $menuItem);
// grab the menu item's position relative to its positioned parent
var menuItemPos = $menuItem.position();
// place the submenu in the correct position relevant to the menu item
$submenuWrapper.css({
top: menuItemPos.top,
left: menuItemPos.left + Math.round($menuItem.outerWidth() * 0.75)
});
});
});
Demo: https://jsfiddle.net/72tnxh45/2/
Below is css which can affect to display all sublinks.
.wrapper1 li:hover > .wrapper1 {
display: block;
}

$(document).ready(function(){
$(".wrapper ul li").click(function(){
//do what ever you want to do with li
});
});

Please have a look attached snippet.
There are made some change in jqyery code and css also.
$(function() {
// whenever we hover over a menu item that has a submenu
$('li.parent').on('click', function() {
if($(this).children(".wrapper").attr('style')=='display: block;'){
$(this).children(".wrapper").css('display','none');
}else{
$(this).children(".wrapper").css('display','block');
}
});
});
.wrapper {
position: relative;
}
ul {
width: 200px;
max-height: 250px;
overflow-x: hidden;
overflow-y: auto;
}
li {
position: static;
}
li .wrapper {
position: absolute;
z-index: 10;
display: none;
}
li:hover > .wrapper {
//display: block;
}
li:
ul {
margin: 1em;
color: white;
font-family: sans-serif;
font-size: 16px;
}
li {
padding: 1em;
}
li ul {
margin: 0;
}
li .wrapper {
cursor: auto;
}
li .wrapper li {
padding: 0.5em;
}
li:nth-child(2n) {
background: #0E8CE0;
}
li:nth-child(2n+1) {
background: #0064B3;
}
li.parent {
background: #00B99B;
cursor: pointer;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrapper">
<ul>
<li>Abc</li>
<li>Def</li>
<li>Ghi</li>
<li>Jkl</li>
<li class="parent">Mno >
<div class="wrapper">
<ul>
<li>Abc</li>
<li>Def</li>
<li>Ghi</li>
<li>Jkl</li>
<li class="parent">Mno >
<div class="wrapper">
<ul>
<li>Abc</li>
<li>Def</li>
<li>Ghi</li>
<li>Jkl</li>
<li>Mno</li>
<li>Pqr</li>
<li>Stu</li>
<li>Vw</li>
<li>Xyz</li>
</ul>
</div>
</li>
<li>Pqr</li>
<li>Stu</li>
<li>Vw</li>
<li>Xyz</li>
</ul>
</div>
</li>
<li>Pqr</li>
<li>Stu</li>
<li>Vw</li>
<li>Xyz</li>
<li class="parent">Abc >
<div class="wrapper">
<ul>
<li>Abc</li>
<li>Def</li>
<li>Ghi</li>
<li>Jkl</li>
<li>Mno</li>
<li>Pqr</li>
<li>Stu</li>
<li>Vw</li>
<li>Xyz</li>
</ul>
</div>
</li>
<li>Def</li>
<li>Ghi</li>
<li>Jkl</li>
<li>Mno</li>
<li>Pqr</li>
<li>Stu</li>
<li>Vw</li>
<li>Xyz</li>
</ul>
</div>

display a div on hover of an item such that items inside div should be clickable

$().ready(function() {
// Case : 1
$("li.products").hover(function() {
$(this).parents(".cotnainer-fluid").next().toggleClass("show");
//$("#category-list").css("opacity","1 !important");
});
})
div.banner {
width: 100%;
height: 379px;
}
div.banner>.row {
padding: 0 35px;
}
/* .menu{
background: transparent;
opacity: 0.5;
} */
.menu {
margin-right: 0;
margin-left: 0;
}
#menu-items {
background: #121212;
opacity: 0.7;
}
#menu-items {
padding: 22px;
margin: 0 25px;
text-align: center;
border-radius: 0 0 4px 4px;
}
ul#menu-items li {
list-style: none;
display: inline;
color: #939598;
font: normal 12px/16px Gotham-Medium;
}
ul#menu-items li a {
padding-bottom: 20px;
}
ul#menu-items li>a:hover {
color: #fff;
border-bottom: 4px solid #76bd1c;
}
li.item {
padding: 25px;
}
li.search {
margin-left: 145px;
}
#category-list {
width: 900px;
height: 180px;
margin: 0 auto;
/*
margin-top: -380px;
*/
background-color: #f7f6f5;
position: relative;
top: -380px;
z-index: -1;
display: none;
}
.show {
display: block;
}
/* li.products:hover #category-list{
display: block;
} */
#category-list ul li {
list-style: none;
display: inline-block;
}
.category-menu {
padding-top: 80px;
}
.category-menu {
font: normal 12px/16px Gotham-Medium;
color: #603913;
}
#category-menu-items {
margin-top: 5px;
}
#category-menu-items li {
text-align: center;
}
.padding-left60 {
padding-left: 60px;
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<srcipt src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js">
</script>
<div class="cotnainer-fluid" style="margin-top: 40px;">
<div class="banner">
<div class="row menu">
<ul id="menu-items">
<li class="item">HOME
</li>
<li class="item">ABOUT US
</li>
<li class="item products dropdown">PRODUCTS
</li>
<li class="item">STORE
</li>
<li class="item">CONTACT
</li>
<li class="item">LOGIN
</li>
<li class="item search"><i class="search-icon-header" style="font-size: 16px;"></i>
</li>
<li class="item basket"><i class="glyphicon glyphicon-shopping-cart" style="font-size: 16px;"></i>
</li>
</ul>
</div>
<h1 class="page-title">Some Title</h1>
</div>
</div>
<!-- End Nav items -->
<div id="category-list">
<div class="row category-menu">
<ul id="category-menu-items">
<li class="padding-left60">
<a href="">
<p>
<img src="../image/bioorgo-biopesticides.png" alt="">
</p>
<p>BIOPESTIDES</p>
</a>
</li>
<li class="padding-left60">
<a href="">
<p>
<img src="../image/bioorgo-nutrients.png" alt="">
</p>
<p>NUTRIENTS</p>
</a>
</li>
<li class="padding-left60">
<a href="">
<p>
<img src="../image/bioorgo-biofertilizers.png" alt="">
</p>
<p>BIOFERTILIZERS</p>
</a>
</li>
<li class="padding-left60">
<a href="">
<p>
<img src="../image/bioorgo-seeds.png" alt="">
</p>
<p>SEEDS</p>
</a>
</li>
<li class="padding-left60">
<a href="">
<p>
<img src="../image/bioorgo-garden_Acc.png" alt="">
</p>
<p>GARDEN ACCESSORIES</p>
</a>
</li>
</ul>
</div>
</div>
I have a list of items in navbar, now on hovering on one of the list items i want to display a hidden div which contains another list of items which should be clickable.
In the above code, When I hover on PRODUCTS link; a div shows up. Now, I want to click on items in this div!!!!
I guess I need to check for hasClass('show'), and if so then i should be able to hover and click on the div items.
Any suggestions or help on how to move forward with this?

Priority of ID selector is higher than class selector.
Ref.
//Make sure this style is overwrite the style of #category-list
#category-list.show{
display: block;
}

Replace the style with the below one and try and adjust the position using top of category list
<style>
#category-list {
width: 900px;
height: 180px;
margin: 0 auto;
background-color: #f7f6f5;
position: absolute;
/*top: -380px;*/
z-index: -1;
display: none;
}
#category-list ul li {
list-style: none;
display: inline-block;
}
.show {
display: block !important;
}

Did some work in that jsfiddle.
// Show sub-menu with jQuery
$("ul#menu-items li.products a, ul#menu-items li.products").hover(function(){
console.log("show sub menu");
$("#category-list").show();
});
// Hide sub-menu with jQuery
$("body *").not("#menu-items, li.products, li.products a, #category-list, #category-list *, #category-menu-items, div.categories").hover(function(){
console.log($(this)); // Log the elements that triggers hide of sub menu
$("#category-list").hide();
});
Don't know the pure CSS sub-menu technique yet.
https://jsfiddle.net/mantisse_fr/p1eupdo3/1/

Custom CSS Navigation dropdown

Currently on my site when I have too many links, the link falls down below the navigation. See my example: https://jsfiddle.net/cn6z13n1/
Is it possible instead to have a More Links list item at the far right which will have a dropdown populated with links?
.toolkit_nav {
background:#dfdfdf;
width:100%;
height:40px;
padding:0;
}
.toolkit_nav ul {
margin:0;
}
.toolkit_nav ul .page_item {
display:inline-block;
line-height:40px;
list-style-type:none;
margin:0px;
padding:0 20px;
}
.toolkit_nav ul .page_item:first-child {
margin-left:0;
padding-left:0;
}
.page_item:hover, .current_page_item {
background:grey;
}
.page_item a {
color:black;
font-size: 0.9em;
font-weight: 400;
text-decoration:none;
}
<nav class="toolkit_nav">
<div class="row">
<div class="medium-12 columns">
<ul>
<li class="page_item page-item-1035 current_page_item">Introduction</li>
<li class="page_item page-item-1039">Digital Landscapes</li>
<li class="page_item page-item-1039">Link 4</li>
<li class="page_item page-item-1039">Link 3</li>
<li class="page_item page-item-1039">Link 2</li>
<li class="page_item page-item-1039">Link 1</li>
<li class="page_item page-item-1039">Link 5</li>
</ul>
</div>
</div>
</nav>

You would need to do this in js i suggest something like this
get the width of the row (max width for nav)
loop through the li elements and sum up there width (+ remember to add the width of a "more" element here
when sum of width > width of nav element hide the elements
add js to your "more" button which shows the hidden elements
Following code is not tested but should give you an idea:
var maxWidth = $('#nav').width();
var moreWidth = $('#more').width(); // li "more" element
var sumWidth = moreWidth;
$('#nav li').each(function() {
sumWidth += $(this).width();
if(sumWidth > maxWidth) {
$(this).addClass('hide'); // add css for hide class
}
});
$('#more').on('click', function() {
$('#nav .hide').fadeIn(100);
// You will need more code here to place it correctly, maybe append the elements in an container
});
Here an example with your fiddle:
https://jsfiddle.net/cn6z13n1/3/
Note: this is just a rough draft, you might to calc paddings etc. to make this work rly good
Edit: updated example with $(window).resize() function
https://jsfiddle.net/cn6z13n1/6/

You'll need to change you HTML slightly but this will work.
.toolkit_nav {
background: #dfdfdf;
width: 100%;
height: 40px;
padding: 0;
}
.toolkit_nav ul {
margin: 0;
}
.toolkit_nav ul .page_item {
display: inline-block;
line-height: 40px;
list-style-type: none;
margin: 0px;
padding: 0 20px;
}
.toolkit_nav ul .page_item:first-child {
margin-left: 0;
padding-left: 0;
}
.page_item:hover,
.current_page_item {
background: grey;
}
.page_item a {
color: black;
font-size: 0.9em;
font-weight: 400;
text-decoration: none;
}
/* NEW STUFF */
.sub-nav,
.sub-nav li {
box-sizing: border-box;
}
.more {
position: relative;
}
.more>ul {
display: none;
position: absolute;
left: 0;
top: 100%;
padding: 0
}
.more:hover>ul {
display: block;
}
.more>ul>li {
display: block;
width: 100%;
clear: both;
text-align: center;
}
.toolkit_nav ul.sub-nav .page_item:first-child {
padding: 0 20px;
}
<nav class="toolkit_nav">
<div class="row">
<div class="medium-12 columns">
<ul>
<li class="page_item page-item-1035 current_page_item">Introduction
</li>
<li class="page_item page-item-1039">Digital Landscapes
</li>
<li class="page_item page-item-1039">Link 4
</li>
<li class="page_item page-item-1039">Link 3
</li>
<li class="page_item page-item-1039">Link 2
</li>
<li class="page_item page-item-1039 more">More...
<ul class="sub-nav">
<li class="page_item page-item-1039">Link 1
</li>
<li class="page_item page-item-1039">Link 5
</li>
</ul>
</li>
</ul>
</div>
</div>
</nav>