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how to remember the active menu

I have a menu with sub menu(vertical). My first li is active with the sub menu because i'm in the current page but My problem is when I hover in the next li I have the sub menu display it but if i lost the active li when i quits the menu
What I need is:
when my cursor is not hovering in my menu, i need the default sub menu that has the on class
This what i look do it
enter link description here
this link of my code in FIDDLE
enter link description here

I've changed your css so you don't need any js now.
It works this way:
In normal state an element with .on class is displayed;
When you hover #menu then we hide all the .niveau2 elements
When you hover some tab then we show only its .niveau2 element by adding an !important keyword to display property.
#menuu ul li:hover ul{
display: inline-block !important;
}
#menuu ul:hover .niveau2 {
display: none;
}
#menuu .on {
display: block;
}
Here is an example with my changes: http://jsfiddle.net/bymb6kvm/14/

jQuery addClass on click to specific element

I am trying to animate a menu item.
On move over it expands left, and on mouse out it contracts back.
This works fine.
I am also trying to add a class on click to give the button a specific color but it doesn't seem to work.
Here is a fiddle http://jsfiddle.net/g3ra912j/
css:
#menu1 .active {
background-color: #00f;
}
script:
$("#menu1").click(function () {
$(this).toggleClass("active")
})
onclick it supposed to turn blue, but it doesn't.
What am I doing wrong?
Thanks

You have an extra space in your CSS. Should be
#menu1.active {
background-color: #00f;
}
since you are adding the class .active to the same element as has the id menu1. The original CSS would target an element with class .active inside #menu1.

i had to deal with the same problem. use addClass('active') instead toggleClass. just have an if condition to check if the element already has active class before adding active class
let me know if it works.
and about the css bobdye was right

"touch and feel" at custom HTML drop down menu

I made a custom drop down menu on a HTML page + JavaScript. I want that menu to act as following:
When the button "Freunde" gets clicked, the drop down menu appears
When the button gets clicked again, the drop down menu disappears
When the mouse curor leaves the "area" of button + drop down menu, it disappears
The drop down menu consists of a main div with multiple divs in it (the "menu items").
My first approach was to put a onmouseout() on the main div of the drop down menu, but there is following problem: As soon as I hover over an inner div, the onmouseout() is true, and since the inner divs fill the entire main div, the drop down menu is visible only as long as the user doesn't hover over it.
So I tried it to solve similiarly like a JQuery lightbox, namely to put a "background" div over the whole screen and paste the drop down menu in there, and set the onmouseover() there. That would be almost perfect, but the "Freunde" button is also affected from that.
So is there any way to combine an event from different elements? Like
if(cursor is not over Button && cursor is not over DDMenu) set invisible
I marked the desired are in following image

Assuming you're set up as
<ul>
<li></li>
<li></li>
</ul>
You could set up your CSS like this:
#nav ul li ul { display: none; }
#nav ul li.active:hover ul { display: block; }
And then set up your JS like this:
var menuClick = function() {
$(this).toggleClass('active');
menuHover();
};
var menuHover = function() {
$('#nav li.active').hover(function() {
}, function() {
$(this).removeClass('active');
});
});
$('#nav > ul > li').on('click', menuClick);
Granted, this is absolutely gross coding, but I think it should work. (this also assumes you're using the jQuery library).

Hide a css-made dropdown menu

I have created a dropdown menu with css. Here is the HTML code:
<li class="menu" id="menu">
<div class="dropdown">
<div class="col1"> ...
here is the css:
.dropdown {
visibility:hidden;
/*...*/
}
#menu li:hover .dropdown{
visibility:visible;
}
This works perfectly. In jQuery I handle the click event for the links in this menu and I want to use jQuery to hide the dropdown whenever the user clicks on a link so it goes away.
I tried these both (note: I haven't used these together.):
$('.dropdown').css('visibility', 'hidden'); //didn't work
$('.dropdown').hide(); //didn't work either
they both hide the menu but the problem is when they hide it, I don't get the menu again whenever I hover the mouse over the item.

You have to define what happens when the mouse is hovering the button and what happens when it's not. Something like this:
jQuery(document).ready(function(){
jQuery(".dropdown").hover(function() {
/* hovering actions */
}, function() {
/* non-hovering functions */
});
});

That's because jQuery's hide() method uses the rule "display:none" over that elemenent, in this case ".dropdown", to hide it, therefore, by definition, the "visibility" can't work on an element that has the rule "display:none" assigned to it.
Use jQuery to make the dropdown effect instead of a bunch of CSS rules.

Okay, what is actually happening is when you you set $('.dropdown').css('visibility', 'hidden'); on the element, it adds this to the style attribute of the element, inline (you can check this with Firebug). So the CSS
#menu li:hover .dropdown{
visibility:visible;
}
doesn't have any effect because inline styles take precedence. .dropdown elements will always be set as hidden now.

Hide Div When Clicked

I've got a little HTML/CSS/JQuery drop down menu working. My pseudo code for it is:
function closeMenus() {
$('.subMenu').css('display', 'none');
}
#mainMenu ul li .subMenu {
display: none;
position: absolute;
}
#mainMenu ul li:hover .subMenu {
display: block;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="mainMenu">
<ul>
<li>
Menu Header
<div class="subMenu" onClick="closeMenus();">Menu Content</div>
</li>
</ul>
</div>
The CSS works so when someone hovers over Menu Header, the subMenu appears below it and disappears when the mouse leaves the menu. My problem comes when a user clicks an item in the menu; I'd like to hide the menu. The JavaScript hides the menu fine but when the user mouses over the menu header again, it doesn't reappear. It appears that CSS won't override the JavaScript display property. Most, if not all, of the links won't be going to other pages, just calling more JavaScript.
Anyone have any ideas how to hide the sub menu on click so that it will be again visible, or do I need more Javascript to show the menu every time someone hovers?

Use JQuery more fully -- look into the .toggle() command and bind it via click:
$('.subMenu').click(function() {$(this).toggle();});
Then you can eliminate most of your other code.

You're trying to do half of it with CSS and half of it with jQuery. Just do it all with jQuery: http://jsfiddle.net/hw5qr/
$('.subMenu').click(function() {
$(this).hide();
});
$('#mainMenu').hover(function() {
$(this).find('.subMenu').show();
}, function() {
$(this).find('.subMenu').hide();
});

Stryle attribute has highest priority.
$('.ftpBrowseSubMenu').css('display','none');
make
<div style="display:none">
, so rule
#mainMenu ul li:hover
has lower priority against style attribute. So, you have to do everything with javascript.

Like you already said are element styles stronger than css styles (unless you use !important). So you have to to do everything with Javascript what shouldn't be to hard. You have just to register two more event listener: onmouseover and onmouseout. With them you can set the display property to the correct value and it will work this way.