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jquery - on hover li width id - show the matching id div

<ul class="level0">
<li class="level1" id="cat2441"></li>
<li class="level1" id="cat2450"></li>
<li class="level1" id="cat2455"></li>
</ul>
<div class="alles-zwei" id="new-cat2441"></div>
<div class="alles-zwei" id="new-cat2450"></div>
<div class="alles-zwei" id="new-cat2455"></div>
Hallo, on hover the li(id) element I would like to show the matching div(id) – and hover an another li (wrong id) or leaving the ul I would like to hide the div
my approach was
jQuery('.alles li').mouseover(function() {
var cat = '"#new-' + this.id + '"';
jQuery(cat).fadeIn();
});

You were using the wrong selectors. Also '"#new-' + this.id + '"' this syntax is wrong. There is no need to add those double quotes inside the string.
jQuery('.level0 li').hover(function() {
var cat = '#new-' + this.id;
jQuery(cat).show();
}, function() {
var cat = '#new-' + this.id;
jQuery(cat).hide();
});
.alles-zwei {
display: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<ul class="level0">
<li class="level1" id="cat2441">cat2441</li>
<li class="level1" id="cat2450">cat2450</li>
<li class="level1" id="cat2455">cat2455</li>
</ul>
<div class="alles-zwei" id="new-cat2441">cat2441</div>
<div class="alles-zwei" id="new-cat2450">cat2450</div>
<div class="alles-zwei" id="new-cat2455">cat2455</div>

You could do this without having to rely on the id of the element just use the class of the two elements. When you select the class it gets returned as an array so you can match the level1 class array with the alles-zwei class array. It will also simplify your HTML code.
$('.level1').hover(function(){
// Gets the index of the current li emement.
var indx = $(this).index();
// Gets the div element based on the hovered li and hides its siblings.
$('.alles-zwei').eq(indx).show().siblings('div').hide();
});

Target element by attr then append class jQuery

I have a li tag that looks like :
<li class="item maybe" data-selected="1"></li>
<li class="item confused" data-selected="2"></li>
<li class="item why" data-selected="3"></li>
I then have three other elements that look like :
<li class="display"></li>
<li class="display"></li>
<li class="display"></li>
I'm trying to on select of one of the elements append the class to my 2nd list of elements.
So if I selected the li tag with data-selector="1" then my first li tag in my display list will have the class maybe added.
This is what i've tried so far, but i'm getting undefined when I console log my var out :
if ($('.item').attr('data-selected') == 1) {
var itemClassAdd = $('.item').find("[data-selected='1']").attr('class');
console.log(itemClassAdd);
$(".display").addClass(itemClassAdd);
}
Thanks!

I perform action in a click event for convenience:
$("li.item").click(function(){
var index = $(this).data("selected");
$("li.display").eq(index - 1).addClass($(this).attr("class"));
});
If you don't need class item:
$("li.item").click(function(){
var index = $(this).data("selected");
var c = $(this).attr("class").replace("item ", "");
$("li.display").eq(index - 1).addClass(c);
});

The class and the attribute are on the same element, so you use a compound selector, not find:
var itemClassAdd = $('.item[data-selected="1"]').attr('class');
But note that
if ($('.item').attr('data-selected') == 1) {
will only branch of the first element matching .item has data-selected="1", which may or may not be what you want.
Live Example:
if ($('.item').attr('data-selected') == 1) {
var itemClassAdd = $('.item[data-selected="1"]').attr('class');
$(".display").addClass(itemClassAdd);
}
.maybe {
color: green;
}
<ul>
<li class="item maybe" data-selected="1">maybe</li>
<li class="item confused" data-selected="2">confused</li>
<li class="item why" data-selected="3">why</li>
</ul>
<ul>
<li class="display">d1</li>
<li class="display">d2</li>
<li class="display">d3</li>
</ul>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

Using jQuery .nextUntil() on split lists

Is it possible to get the .nextUntil() to work on split lists, or get the same functionality?
So I am trying to implement the ever so popular shift select for my items, and since they are ordered in a list in my application I want to be able to select across <ul> borders.
I have the following set of DOM elements:
<ul class="current">
<li class="item">first</li>
<li class="item clicked">second</li>
<li class="item">third</li>
<li class="item">fourth</li>
</ul>
<ul class="later">
<li class="item">fifth</li>
<li class="item selected">sixth</li>
<li class="item">seventh</li>
</ul>
And using something like this:
$('li.clicked').nextUntil('li.selected');
I'd like a list containing the following elements
[ <li class="item">third</li>,
<li class="item">fourth</li>,
<li class="item">fifth</li> ]
However all I get is the elements leading up to the split </ul>. Is there any way of doing this? I have also tried to first selecting all items with $('.item')and then using .nextUntil() on them without any luck.

Is this what you are looking for?
$('li').slice($('li').index($('.clicked'))+1,$('li').index($('.selected')));
For reference
Jquery.Index
Jquery.Slice
Edit
So if you do
$('li')
you will get an array of all elements 'li' getting:
[<li class=​"item">​first​</li>​,
<li class=​"item clicked">​second​</li>​,
<li class=​"item">​third​</li>​,
<li class=​"item">​fourth​</li>​,
<li class=​"item">​fifth​</li>​,
<li class=​"item selected">​sixth​</li>​,
<li class=​"item">​seventh​</li>​]
Since it is an array you can slice him to get an sub array you just need two positions, where to start and here to finish.
//start
$('li').index($('.clicked'))+1 // +1 because you dont want to select him self
//end
$('li').index($('.selected'))
For better preformance you should before create an array with all li so it will not search all dom 3 times for the array of 'li'
var array = $('li');
var subarray = array.slice(array.index($('.clicked'))+1,array.index($('.selected')));

Assuming these lists cannot be merged into one, it is impossible using the nextUntil method. This is because of how jQuery performs traversing. According to the documentation,
Get all following siblings of each element up to but not including the element matched by the selector, DOM node, or jQuery object passed.
fifth is not a sibling of the clicked element, but rather it is a child of the sibling of the element's parents.
I came up with two possible solutions.
Solution 1: Combine NEXT and PREV traversals
Assuming that .clicked is always in the first list and .selected is always in the second list, combining prevAll() with nextAll() should do the trick. This assumes that the order is the same.
var siblings = $("li.clicked").nextAll()
Get all siblings of the current element AFTER the element itself.
var distantSiblings = $("li.selected").prevAll();
Get all distant siblings after the first element, but before the second one.
siblings.push(distantSiblings);
Combine them into two and then iterate over each element.
var siblings = $("li.clicked").nextAll()
var distantSiblings = $("li.selected").prevAll();
siblings.push(distantSiblings);
siblings.each(function() {
$(this).addClass("blue");
});
.blue { color: blue; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="current">
<li class="item">first</li>
<li class="item clicked">second</li>
<li class="item">third</li>
<li class="item">fourth</li>
</ul>
<ul class="later">
<li class="item">fifth</li>
<li class="item selected">sixth</li>
<li class="item">seventh</li>
</ul>
http://jsfiddle.net/r15z10o4/
Note:
You will notice that the above code works, however it might not be the optimal solution. This is only confirmed to work for your example above. There may also be a less verbose solution.
Solution 2 (Find index of all list items)
Another idea is to find the index of all items, and collect the elements that are sandwiched between those two indices. You will then want to use the 'slice' selector to get the range in between.
var items = $(".item");
var clicked = $(".clicked");
var selected = $(".selected");
var clickIndex = items.index(clicked);
var selectIndex = items.index(selected);
$("li").slice(clickIndex + 1, selectIndex).addClass("blue");
var clicked = $(".clicked");
var selected = $(".selected");
var clickIndex = $("li").index(clicked);
var selectIndex = $("li").index(selected);
$("li").slice(clickIndex+1, selectIndex).addClass("blue");
.blue { color: blue; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="current">
<li class="item">first</li>
<li class="item clicked">second</li>
<li class="item">third</li>
<li class="item">fourth</li>
</ul>
<ul class="later">
<li class="item">fifth</li>
<li class="item selected">sixth</li>
<li class="item">seventh</li>
</ul>

You can do it manually by selecting all these items at once, and using loops.
Consider the parent element, let's say "container":
<div id="container">
<ul class="current">
<li class="item">first</li>
<li class="item clicked">second</li>
<li class="item">third</li>
<li class="item">fourth</li>
</ul>
<ul class="later">
<li class="item">fifth</li>
<li class="item selected">sixth</li>
<li class="item">seventh</li>
</ul>
</div>
Now, you can select all these items:
var $items = $("#container > ul > li.item"); // or simply $("#container .item");
And iterate through them:
var $items = $(".item"), $result = $(), found = false;
for (var i = 0; i < $items.length; i++)
{
$currentItem = $items.eq(i);
if ($currentItem.is('.clicked')) {
found = true;
continue;
}
if ($currentItem.is('.selected'))
break;
if (found)
$result = $result.add($currentItem);
}
console.log($result);
Here is the working JSFiddle demo.

In any case it feels like you will need to define groups of li.
I think the easiest is to create a function getting a list of lis that you can request any way you want then to filter the el you are interested in.
function elRange(elList, start, end){
// we do not use indexOf directly as elList is likely to be a node list
// and not an array.
var startI = [].indexOf.call(elList, start);
var endI = [].indexOf.call(elList, end);
return [].slice.call(elList, startI, endI + 1);
}
// request the group of *ordered* elements that can be selected
var liList = document.querySelectorAll('ul.current > li, ul.later > li');
var selectionEnd = document.querySelector('.selected');
[].forEach.call(liList, function(li){
li.addEventListener('click', function(){
var selected = elRange(liList, li, selectionEnd);
selected.forEach(function(el){
el.classList.add('red');
})
});
});
.selected {
color: blue;
}
.red {
color: red;
}
<ul class="current">
<li class="item">first</li>
<li class="item">second</li>
<li class="item">third</li>
<li class="item">fourth</li>
</ul>
<ul class="later">
<li class="item">fifth</li>
<li class="item selected">sixth</li>
<li class="item">seventh</li>
</ul>

Displaying selection text in span

So let's say I have this code:
<span id="select_list">
<ul>
<li><a id="1">1</a></li>
<li><a id="2">2</a></li>
<li><a id="3">3</a></li>
</ul>
</span>
<span id="selection"></span>
And let's also assume that there are a lot of list elements, ex. '4,5,6,7... etc'.
Can I get a html file, that is basically just text, that corresponds to the list element's ID (ex. 1.html, 2.html,... etc), to show in 'selection'?
If so how?
Thanks for your time. Hope I explained it well.

Something like this (jQuery) should work:
var list = $("#select_list");
var sel = $("#selection");
$("a", list).on("click", function(){
var id = $(this).attr("id");
sel.load(id+".html");
});

<div id="select_list">
<ul>
<li id="1">1</li>
<li id="2">2</li>
<li id="3">3</li>
</ul>
</div>
<div id="selection"></div>
i would use a div not span spans are for if you want to change the size of something particular like this:
<li id="1" href="#"><a href="#"><span style="color: red;
font-size: 30px">1</span></a></li>
and from what i am understanding you want a selector to select them in css?
if so this is how:
#select_list ul li:nth_child(1) {
}
or
#select_list ul li#2 {
}
hope this helps you

I would suggest using data-attributes instead of IDs.
HTML
<ul class='selection-list'>
<li data-name='Dog'>Dog</li>
<li data-name='cat.html'>Cat</li>
<li data-name='45'>Fourty Five</li>
<li data-name='Triangle'>Three sides</li>
</ul>
<div class="output js-output"></div>
jQuery
var $output = $('.js-output');
$('.selection-list li').on('click', function() {
var selectionValue = $(this).data('name');
$output.text(selectionValue);
});
CSS
.selection-list li {
cursor: pointer;
}
jsFiddle
iframe
I'm starting to think that you are asking for an iframe with dynamic source. The question is unclear. You may want to try and rewrite it. - Here is what I think you may be after...
HTML
<ul class='selection-list'>
<li data-url='http://reputable.agency'>Reputable Agency</li>
<li data-url='http://perpetual.education'>Perpetual Education</li>
<li data-url='http://example.com/index.html'>Example.com</li>
</ul>
<iframe src='http://example.com' class="output js-output"></iframe>
JavaScript / jQuery
var $output = $('.js-output');
$('.selection-list li').on('click', function() {
// get the 'data-url' from the element...
var selectionValue = $(this).data('url');
// put that data-url into the src attribute of the iFrame
$output.attr('src', selectionValue);
});
Also..
Note that if you are using the same domain for all of these, you can build those urls differently to keep things simple.
<li data-url='index.html'>Example.com</li>
$output.attr('src', 'http://yoursite.com/' + selectionValue);
jsFiddle
AJAX
Now I'm wondering if you mean AJAX. Here is an example - but it's not tested because I don't have access to a bunch of relative URLs - but here is the basics - and should lead you to the right documentation.
HTML
<ul class='selection-list'>
<li data-url='index.html'>Reputable Agency</li>
<li data-url='index.html'>Perpetual Education</li>
<li data-url='index.html'>Example.com</li>
</ul>
<div class="output js-output"></div>
JavaScript / jQuery
var $output = $('.js-output');
var getOtherPage = function(target) {
$.ajax({
url: target,
success:function(response){
$output.html(response);
},error:function(){
alert("error");
}
});
};
$('.selection-list li').on('click', function() {
var selectionValue = $(this).data('url');
getOtherPage(selectionValue);
});

Next child LI that is wrapped in a different UL

I have the following list:
<ul>
<li class="item">One</li>
<li class="item">Two</li>
<li class="item">Three
<ul>
<li class="item">Something Original</li>
<li class="item selected">Something</li>
</ul>
</li>
<li>Four
<ul>
<li class="item">I want this selected next</li>
<li class="item">Good</li>
</ul>
</li>
</ul>
Using jQuery, how do I find the next li with the class="item" since it is wrapped in a different container. Obviously I cannot do $(".selected").next(".item") so how else can I do it?
JSFiddle: http://jsfiddle.net/q3f6v7zz/

Since the li elements are nested and you know that you want the next appearing li with a particular class, you can use .index() and do something like this
var $li = $('.item'); // <--- get the list of all lis with class .item
var index = $li.index($('.selected')); // <--- find the index of the one with .selected amongst all the lis
console.log($li.eq(index+1).html()); // <--- index+1 because you need the next appearing li after selected
If you want to move the selected class on keydown something like this should do
var $li = $('.item');
$(document).on('keydown', function(e) {
if (e.keyCode == 40) {
var index = $li.index($('.selected'));
$li.eq(index).removeClass('selected');
index = (index+1) % $li.length; // <--- to rotate the values from 0 to count of li.item elements
$li.eq(index).addClass('selected');
}
});
var $li = $('.item');
$(document).on('keydown', function(e) {
if (e.keyCode == 40) {
var index = $li.index($('.selected'));
$li.eq(index).removeClass('selected');
index = (index+1) % $li.length;
$li.eq(index).addClass('selected');
}
});
.selected {
background: green;
color: white;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<ul>
<li class="item">One</li>
<li class="item">Two</li>
<li>Three
<ul>
<li class="item">Something</li>
<li class="item selected">Something Else</li>
</ul>
</li>
<li>Four
<ul>
<li class="item">I want this selected next</li>
<li class="item">Good</li>
</ul>
</li>
</ul>

You can get the index of the selected element within all lis, and then increment that index to get the next one.
$("ul").on("click", "li.item.selected", function() {
var all_li = $("li.item");
var selected_index = all_li.index(this);
var next_li = all_li.eq((selected_index + 1) % all_li.length);
$(this).removeClass("selected");
next_li.addClass("selected");
});
.item.selected {
background-color: yellow;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul>
<li class="item">One</li>
<li class="item">Two</li>
<li class="item">Three
<ul>
<li class="item selected">Something</li>
</ul>
</li>
<li>Four
<ul>
<li class="item">I want this selected next</li>
<li class="item">Good</li>
</ul>
</li>
</ul>
I used the modulus so it will wrap around at the end.

Not sure what you are exactly looking for but you can use $(Element").parent().parent().find("li");
So in other words .parent() may be what you are looking for there is also .sibling() to find or you may want $('li').closest('ul').find('li')
which will go up the tree to find the nearest ul to the one you are looking for
https://api.jquery.com/closest/
You may also use:
Vanilla JS to do something similar to what was discussed by others with $index if it makes more sense to you:
Again this isn't as efficient but that is basically what JQuery is doing:
var myLis = document.getElementsByTagName('li');
var wantedIndex;
for(var i = 0;i<myLis.length; i++){
if(myLis[i].className === "active"){
wantedIndex = i+1; //gets the li which is next when selecting all lis
}
}