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find next elements but not in order having same class

I want to find elements which have .item class but they are not in order. Below is sample code.
<ul>
<li class="item">list item 1</li>
<li>list item 2</li>
<li>list item 3</li>
<li class="item">list item 4</li>
<li>list item 5</li>
<li class="item">list item 6</li>
</ul>
I want to traverse each li element having only .item class on key-press event. I have tried .nextAll() getting all elements but it takes much time to produce resultsets as I have huge li elements.
var siblingsElements = $('.item').nextAll(); // Takes much time
How can i achieve the result ? Thanks in advance.

Try to rewrite code with Native JS, it works much faster
var items = $('ul')[0].getElementsByClassName('item');
items = $(items);

You can try
$('li.item').each(function(){
--your code here--
})
Because this will find only li having class "item" instead of all dom elements having class "item" which may speed up your process.

jQuery .click() .show() function issues

Could anyone please let me know what i'm doing wrong.
I have:
//My HTML
<div>
<ul>
<li id="test">Main Item 1</li>
<ul class="list-in-list">
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
</ul>
<li>Main Item 2</li>
<li>Main Item 3</li>
</ul>
</div>
//My CSS
.list-in-list {
display:none;
}
//My jQuery
$(document).ready(function() {
$('#test').click(function() {
alert("hello");
});
});
My final goal is to show that none displayed content if you press a list item, so that it expands neatly. However, i can't seem to get that alert() appearing in any way. Should i use an id for all list items in the main list, or is it enough with a class?
/W

you can add .next function to show next ul for any li curreny click by user. you have to change id test to one class name to make effect in all click of main li
HTML would be like
<div>
<ul>
<li class="main">Main Item 1</li>
<ul class="list-in-list">
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
</ul>
<li class="main" >Main Item 2</li>
<ul class="list-in-list">
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
</ul>
<li class="main">Main Item 3</li>
<ul class="list-in-list">
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
</ul>
</ul>
</div>
and JQuery function is below
$(document).ready(function() {
$('.main').click(function() {
$(this).next(".list-in-list").slideToggle();
});
});
for detail you can check link

Should i use an id for all list items in the main list, or is it enough with a class?
IDs are unique. Your JavaScript code will not work properly if you have multiple identical IDs. If you're planning on adding a similar attribute to all of your list items you'd use a class in this case (and reference it with . instead of #). In this case you'd call the click function using:
$('li.myClass').click(...);
If you only have one list, however, you can simply add the ID to the ul and use the click function as:
$('ul#myId > li').click(...);
Note that it would be marginally quicker with the classes in this case.
You'd then reference your inner ul using:
$('li.myClass > ul.list-in-list');
Or, depending on which of the above you went with:
$('ul#myId > li > ul.list-in-list');
(You'd use > here to select only the direct child. If you used ul#myId li you'd also be selecting the li elements which belong to any inner ul)

Your code works fine I do believe you have not included Jquery on your page - or maybe the path to it is not valid. Check your network tab to see if you get an http error retrieving jquery.
You can show the hidden li by doing the following:
$(document).ready(function() {
$('#test').click(function(e) {
$(this).find('.list-in-list').show();
});
});
Your code works fine:
Demo
In this case classes would be better than ids because Id's have to be unique on your page. You can use classes like in the demo below by adding a class to your outer li elements. Just change the binding from #test to whatever class you give your li elements.
$('.clickAbleLi').click(function(e) {
$(this).find('.list-in-list').show();
});
Demo

You close your </li> tag before your "list-in-list". You should close your </li> tag after your inside list ;) Like this :
<div>
<ul>
<li id="test">Main Item 1
<ul class="list-in-list">
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
</ul>
</li>
<li>Main Item 2</li>
<li>Main Item 3</li>
</ul>
</div>

It sholud work but Try moving the ID attribute to the A instead of LI if you experience problems

change class on LI click

I need to dinamically assign a .selected class to the element where I click and also remove any other previous class asigned to the clicked element so I can change CSS class. Maybe this code:
$(this).click(function(){
$(this).addClass('selected');
});
works but what happend if I click in any other LI? Any help to get this work?
EDIT:
Ok see this code:
<ul>
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
</ul>
By default none have any classes but I click in Item 2 then the HTML should transform on this one:
<ul>
<li>Item 1</li>
<li class="selected">Item 2</li>
<li>Item 3</li>
</ul>
but once again if I click in Item 3 then the HTML should transform on this one:
<ul>
<li>Item 1</li>
<li>Item 2</li>
<li class="selected">Item 3</li>
</ul>
This is what I'm trying to do

I'd suggest:
$(selector).click(function(){
$('.selected').removeClass('selected');
$(this).addClass('selected');
});
With regards to the comment left by moonwave99 (below), if you only want to remove the selected class-name from those elements contained within the same parent element:
$(selector).click(function(){
var that = $(this);
that.parent().find('.selected').removeClass('selected');
that.addClass('selected');
});
Though it's worth remembering what element you're clicking, and what the parent will be, for example, clicking on the a in the following HTML:
<ul>
<li>link text</li>
</ul>
Will look within the li for the other .selected elements, and so you should use:
$(selector).click(function(){
var that = $(this);
that.closest('ul').find('.selected').removeClass('selected');
that.addClass('selected');
});

First remove selected class from all li inside ul and then apply class to clicked li.
$('ul li').click(function(){
$('ul li').removeClass('selected');
$(this).addClass('selected');
});

On my travels I discovered that it is not possible to addClass of 'active' to list items in when using bootstrap. So if you are reading this (as I was) wondering why this doesn't work when the classname is 'active' you need to choose something else.

Find the last child or grandchild in a UL

I have a CMS generating a basic navigation using a UL. Each first-level LI is styled to be a group. I need to apply a style to the last element within each of the first level LI "groups". Meaning; if a first-level LI has no children, I want to apply a style to it (as the "bottom" of the group); if it does have children, I want to find the last child OR grandchild element that appears (again, the "bottom" of the group). I have used both CSS and Javascript "last" classes, and have successfully applied styles to the last child of a certain depth within the first-level LI, but that isn't helpful since the bottom button of the list is of an unknown depth.
My line of thinking involves a IF statement that finds the last child of the first level, checks if it has children, and if it does, go another level deep and find that last child and checks for children, repeating this process until it finds the last LI that does not have children within the first-level LI groups. However, I am a JS noob and am not sure how to go about that.
I am open to CSS or JavaScript/jQuery solutions. I have been banging my head on this one for a while and appreciate any input or better ideas. Thanks for your help!!
--
Update: here's a code sample of what I am hoping for:
<ul id="navigation>
<li>Item one</li> <!--Style this one-->
<li>Item Two
<ul>
<li>Item Two-One</li>
<li>Item Two-Two</li> <!--Style this one-->
</ul>
<li>
<li>Item Three
<ul>
<li>Item Three-One</li>
<li>Item Three-Two
<ul>
<li>Item Three-Two-One</li>
<li>Item Three-Two-One</li> <!--Style this one-->
</ul>
</li>
</ul>
<li>
<li>Item Four
<ul>
<li>Item Four-One</li>
<li>Item Four-Two
<ul>
<li>Item Four-Two-One</li>
<li>Item Four-Two-One</li>
</ul>
</li>
<li>Item Four-Three</li> <!--Style this one-->
</ul>
<li>
</ul>
The reason the .last selector doesn't work is because, in the above example, it would style item Four-Two-One since it is the last element of its UL.

To clean up my answer, incase this is read at a later date.
here is my solution to your problem:
var checkChildren = function($this) {
if (!$this.children().length) {
$this.css({
color: '#f00',
fontWeight: '700',
textDecoration: 'underline'
});
return false;
}
return true;
};
$("#navigation").children("li").each(function() {
$these = $(this);
while (checkChildren($these)) {
$these = $these.children().last() || $these.next();
}
});

I think this is what you want. It's part of the jQuery API.
http://api.jquery.com/last/
HTML
<ul>
<li>list item 1</li>
<li>list item 2</li>
<li>list item 3</li>
<li>list item 4</li>
<li>list item 5</li>
</ul>
jQuery
$('li').last().css('background-color', 'red');
EDIT:
Okay I figured out a way for you to do it.. the only caveat is that you need to be able to set a class for the first level of <li>'s. I've posted my findings here:
http://jsfiddle.net/TTXch/54/
It selects the last of the <li>'s for each main navigation element. Your posted structure was a little off... the end tags didn't all match up. Anyway, check out the jQuery in the javascript window in the jsFiddle.

You should be able to use the jQuery last selector for this (http://api.jquery.com/last-selector/).

Grouping list items (LIs) to OLs/ULs using jQuery

Is it possible, using Javascript and either jQuery or regular expressions, to group multiple sibling list items in HTML as in the example below? I need to convert TikiWiki markup to HTML, and it uses ungrouped lists (just adjacent lines appended with #).
<li>Item 1.1</li>
<li>Item 1.2</li>
<li>Item 1.3</li>
<p>Paragraph</p>
<li>Item 2.1</li>
<li>Item 2.2</li>
To this:
<ul>
<li>Item 1.1</li>
<li>Item 1.2</li>
<li>Item 1.3</li>
</ul>
<p>Paragraph</p>
<ul>
<li>Item 2.1</li>
<li>Item 2.2</li>
</ul>
I already tried using $("li").wrapAll() and siblings(). Both failed.
There's another approach. Here's the regex I'm currently using to convert TikiWiki lists to HTML list items: replace(/[#](.*)\n?/g, "<li class='numbered'>$1</li>") Is it possible to match repeated patterns, and convert them accordingly to HTML as in this pseudo regex? replace(/repeat([#](.*)\n?)/g, "<ol>foreach(<li class='numbered'>$1</li>)</ol>")

Here is my first hack at it. this might get you going in the right direction
<div id='testList'>
<li>Item 1.1</li>
<li>Item 1.2</li>
<li>Item 1.3</li>
<p>Paragraph</p>
<li>Item 2.1</li>
<li>Item 2.2</li>
</div>
<script language='javascript' type='text/javascript'>
$.fn.tagName = function() {
return this.get(0).tagName;
}
$(document).ready(function() {
alert($("#testList").html());
$("li").each(function() {
if ( $(this).parent().tagName() != "UL" ) {
$(this).wrap("<ul></ul>");
// alert($(this).parent().tagName())
}
})
alert($("#testList").html());
});
</script>

The <p> is just hanging out in the middle of a bunch of <li>s, signifying the beginning or end of a group? Then maybe something like this:
​$('div#container') // assume you're got it in a container div
.find('p').each( function(){ // each p signifies a new group
$(this)
.prev('li') // walk back to the preceding li
.prevUntil('p') // get the set of elements up to the previous p
.andSelf() // include the current li
.wrapAll('<ul>');​​​​​​​​​​​​​​​​​​​​​​​​​​ // wrap the set in a ul
});
​
Here's a working jsFiddle using this approach.