Develop Reference

Display parent UL and for the root parent both UL and LI node

<ul id="ul_Book1">
<li id="li_Book1"> Book1 </li>
<ul id="ul_Chap1">
<li id= "li_Chap1"> Chapter 1</li>
<ul>
<li id="li_Sect11" > Section 1.1 </li>
<li id="li_Sect12" > Section 1.2 </li>
<li id="li_Sect13" > Section 1.3 </li>
</ul>
</ul>
<ul id="ul_Chap2">
<LI id= "li_Chap2"> Chapter 2</LI>
<ul>
<li id="li_Sect21" > Section 2.1 </li>
<li id="li_Sect22" > Section 2.2 </li>
<li id="li_Sect23" > Section 2.3 </li>
</ul>
</ul>
<ul id="ul_Chap3">
<li id= "li_Chap3"> Chapter 3</li>
<ul>
<li id="li_Sect31" > Section 3.1 </li>
<li id="li_Sect32" > Section 3.2 </li>
<li id="li_Sect33" > Section 3.3 </li>
</ul>
</ul>
function menuDisplayPath(li_id) {
var idVal = li_id;
var $obj = $('li').filter(function () { return $(this).attr('id') == idVal; }).parents();
$($obj.get().reverse()).each(function () {
if ($(this).is("li")) {
$(this).find('li').each(function () {
$(this).show();
});
$(this).find('Ul').each(function () {
$(this).show();
});
}
});
}
When a LI node is selected , say "Section 3.2" , I would like to expand/show only "Book1-- Chapter3 -- Section 3.2" and rest of the UL nodes under Book1 should not expand.
But my function menuDisplayPath(li_id) is expanding all the UL under Book1 and also display all LI's. What am I missing in the function.

Assuming all is expanded on load.
First, I corrected many missing double-quotes and extra spaces...
So here is your HTML:
<input type="reset" id="reset" value="Expand all">
<ul id="ul_Book1">
<li id="li_Book1"> Book1 </li>
<ul id="ul_Chap1">
<li id="li_Chap1"> Chapter 1</li>
<ul>
<li id="li_Sect11"> Section 1.1 </li>
<li id="li_Sect12"> Section 1.2 </li>
<li id="li_Sect13"> Section 1.3 </li>
</ul>
</ul>
<ul id="ul_Chap2">
<li id="li_Chap2"> Chapter 2</li>
<ul>
<li id="li_Sect21"> Section 2.1 </li>
<li id="li_Sect22"> Section 2.2 </li>
<li id="li_Sect23"> Section 2.3 </li>
</ul>
</ul>
<ul id="ul_Chap3">
<li id="li_Chap3"> Chapter 3</li>
<ul>
<li id="li_Sect31"> Section 3.1 </li>
<li id="li_Sect32"> Section 3.2 </li>
<li id="li_Sect33"> Section 3.3 </li>
</ul>
</ul>
</ul>
And here is the way to hide the other chapters on click of a li with a section id:
$(document).ready(function(){
$("#ul_Book1").on("click","ul ul li", function(){
$(this).parent().parent().siblings("ul").each(function(){
$(this).hide(); // Hides all other chapter
});
});
$("#reset").on("click",function(){
$("#ul_Book1").children("ul").each(function(){
$(this).show();
});
});
});
Fiddle
Now... Can't tell you how to display the <section> since I didn't see the relevant HTML.

The following worked for me:
function open($li) {
$('.content').hide();
$li.children().show();
if ($li.hasClass('section')) $li.parent().parent().children().show();
}
// test driver
$(document).ready(function() {
$('li').click(function (e) { open($(this)); e.stopPropagation(); });
});
.content {
display: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="book">
<li class="chapter">Chapter One
<ul class="chapter content">
<li class="section">Section One<br><i class="content">1.1 contents</i></li>
<li class="section">Section Two<br><i class="content">1.2 contents</i></li>
</ul>
</li>
<li class="chapter">Chapter Two
<ul class="chapter content">
<li class="section">Section One<br><i class="content">2.1 contents</i></li>
<li class="section">Section Two<br><i class="content">2.2 contents</i></li>
</ul>
</li>
</ul>
Basically you put the section element you want to be open inside the open($li) function.
You should also only put <li> elements inside <ul> elements.
I hope this is what you wanted.

removing html tags but keep the inner html

I have a nav menu which have a mega menu.It has several markup to make it a mega menu.But i want to remove some of the markups when in small viewport.
So my markups are
<ul class="megamenu-wrapper">
<li>
<ul>
<li>Home</li>
<li>Abort</li>
<li>Contact</li>
</ul>
</li>
<li>
<ul>
<li>gang</li>
<li>menu</li>
<li>food</li>
</ul>
</li>
</ul>
what i want
<ul class="megamenu-wrapper">
<li>Home</li>
<li>Abort</li>
<li>Contact</li>
<li>gang</li>
<li>menu</li>
<li>food</li>
</ul>
i have two mega-menu-wrapper
What i have tried
var megaContents = $('.megamenu-wrapper li ul').contents();
$('.megamenu-wrapper li ul').replaceWith( megaContents );
It makes a same list in two each mega menu and in each megamenu there is about 5 times repetation of each elements.
Anyone please help.

Use
//Fimd child ul li and append it to main ul
$('.megamenu-wrapper > li > ul > li').appendTo('.megamenu-wrapper');
//Remove li having ul
$('.megamenu-wrapper > li:has(ul)').remove();;
$(document).ready(function() {
$('.megamenu-wrapper > li > ul > li').appendTo('.megamenu-wrapper'); +
$('.megamenu-wrapper > li:has(ul)').remove();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="megamenu-wrapper">
<li>
<ul>
<li>Home
</li>
<li>Abort
</li>
<li>Contact
</li>
</ul>
</li>
<li>
<ul>
<li>gang
</li>
<li>menu
</li>
<li>food
</li>
</ul>
</li>
</ul>
use .each() if you have multiple menus
$('.megamenu-wrapper') each(function () {
$(this).find('> li > ul > li').appendTo(this);
$(this).find(' > li:has(ul)').remove();
});
DEMO

With your current markup, you can use append() which will take the children li with anchors and append them as direct children of .megamenu-wrapper
Then, use remove() to remove the former parent li elements which now contain empty ul children
$('.megamenu-wrapper').append($('li:has(a)'));
$('.megamenu-wrapper').children('li:has(ul)').remove();
Update
For multiple menus, you can use the snippet above, but wrap it in an each() call
$('.megamenu-wrapper').each(function(){
$(this).append($(this).find('li:has(a)'));
$(this).children('li:has(ul)').remove();
});
$('.megamenu-wrapper').each(function(){
$(this).append($(this).find('li:has(a)'));
$(this).children('li:has(ul)').remove();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<ul class="megamenu-wrapper">
<li>
<ul>
<li>Home</li>
<li>Abort</li>
<li>Contact</li>
</ul>
</li>
<li>
<ul>
<li>gang</li>
<li>menu</li>
<li>food</li>
</ul>
</li>
</ul>
<ul class="megamenu-wrapper">
<li>
<ul>
<li>Home</li>
<li>Abort</li>
<li>Contact</li>
</ul>
</li>
<li>
<ul>
<li>gang</li>
<li>menu</li>
<li>food</li>
</ul>
</li>
</ul>

nested list css problems

I am having trouble nesting a list in the following. The nested list isn't appearing on the page. I assume its something to do with my JS hiding it. Can anyone see what the problem may be - it's driving me mad!
<ul class="question">
<li>QUESTION goes here
<ul>
<li>ANSWER goes here>
</li>
</ul>
</li>
<li>QUESTION 2 goes here
<ul>
<li><a href="#">ANSWER 2 goes here>
<li>
<ul>
<li>nested list item 1</li>
<li>nested list item 2</li>
<li>nested list item 3</li>
</ul>
</li></a>
</li>
</ul>
</li>
</ul>
My JS:
<script>
$(document).ready(function () {
$('#question > li > a').click(function(){
if (!$(this).hasClass('active')){
$('#question li ul').slideUp();
$(this).next().slideToggle();
$('#question li a').removeClass('active');
$(this).addClass('active');
}
else{
$('#question li ul').slideUp();
$('#question li a').removeClass('active');
}
});
});
</script>

Here:
http://jsfiddle.net/eAJjs/
$('#question > li > a').click(function () {
if (!$(this).hasClass('active')) {
$('#question>li>ul').slideUp();
$(this).next().slideToggle();
$('#question>li>a').removeClass('active');
$(this).addClass('active');
} else {
$('#question>li>ul').slideUp();
$('#question>li>a').removeClass('active');
}
});
<ul id="question">
<li>QUESTION goes here
<ul>
<li>ANSWER goes here>
</li>
</ul>
</li>
<li>QUESTION 2 goes here
<ul>
<li><a href="#">ANSWER 2 goes here>
<li>
<ul>
<li>nested list item 1</li>
<li>nested list item 2</li>
<li>nested list item 3</li>
</ul>
</li></a>
</li>
</ul>
</li>
</ul>

Jquery code for multi-level dropdown navigation menu

All,
I am new to JQuery and trying to write JQuery code to create a multi level dropdown menu. The HTML looks like below:
<ul id="menu">
<li>Link 1
<ul class="submenu">
<li>Sub Link 1.1
<ul class="submenu">
<li> Sub Link 1.1.1</li>
<li> Sub Link 1.1.2</li>
</ul>
</li>
<li>Sub Link 1.2</li>
<li>Sub Link 1.3</li>
</ul>
</li>
<li>Link 2
<ul class="submenu">
<li>Sub Link 2.1
<ul class="submenu">
<li> Sub Link 2.1.1</li>
<li> Sub Link 2.1.2</li>
</ul>
</li>
<li>Sub Link 2.2</li>
</ul>
</li>
</ul>
The JQuery code I got so far is as under, but it's not opening and closing the submenus.How can I make it work?
$(document).ready(function () {
$('#ul.menu > li').hover(function () { $('ul:first', this).show(); },
function () { $('ul:first', this).hide(); }
);
$('#ul.menu li li').hover(function () {
$('ul:first', this).each(function () {
var p = $(this).parent();
$(this).css('top', p.position().top)
.css('left', p.position().left + p.width())
.show();
});},
function () { $('ul:first', this).hide(); }
);
});

Chick this out: http://jsfiddle.net/g5xSX/ , maybe it is exactly what you want

I created this fiddle, it's just a start but some of it it's working http://jsfiddle.net/mZzqu/2/
I simplified your markup (attach click handler to 'li', it's better)
<ul id="menu">
<li>Link 1
<ul class="submenu">
<li>Sub Link 1.1
<ul class="submenu">
<li id='1'> Sub Link 1.1.1</li>
<li>Sub Link 1.1.2</li>
</ul>
</li>
<li>Sub Link 1.2</li>
<li>Sub Link 1.3</li>
</ul>
</li>
<li>Link 2
<ul class="submenu">
<li>Sub Link 2.1
<ul class="submenu">
<li> Sub Link 2.1.1</li>
<li> Sub Link 2.1.2</li>
</ul>
</li>
<li>Sub Link 2.2</li>
</ul>
</li>
</ul>
jquery code
$.fn.dropdown = function (options) {
var settings = jQuery.extend({
timeout: 0.2
}, options);
var closetimer = null;
var ddmenuitem = null;
$(this).children('li').each(function(){
$(this).find('ul').hide();
});
$(this).find('li').hover(dropdown_open, dropdown_close);
document.onclick = dropdown_close;
function dropdown_open(event)
{
dropdown_canceltimer();
//dropdown_close();
ddmenuitem = $(event.target).children('ul').css('display', 'block');
}
function dropdown_close(event) {
$(event.target).parent('ul:not(#menu)').hide();
}
function dropdown_timer() {
closetimer = window.setTimeout(dropdown_close, settings.timeout * 1000);
}
function dropdown_canceltimer() {
if (closetimer) {
window.clearTimeout(closetimer);
closetimer = null;
}
}
return this;
}

jQuery and selecting the next list items objects

I have a nav built with a list and sub nav as lists inside a parent list. The sub nav resides in the next list item to it's corresponding main nav link:
This sits in a div with an id of 'nav'
<ul>
<li>Nav main 1</li>
<li>
<ul>
<li>sub 1</li>
<li>sub 2</li>
<li>sub 3</li>
<li>sub 4</li>
</ul>
</li>
<li>Nav main 2</li>
<li>
<ul>
<li>sub 1</li>
<li>sub 2</li>
<li>sub 3</li>
<li>sub 4</li>
</ul>
</li>
</ul>
Currently I have the following jquery:
$(document).ready(function() {
$("#nav ul li a[href^='#']").each(function(){
if ($(this).next().is(':visible')) {
$(this).next().hide();
} else {
$("#nav ul li a[href^='#']").each(function(){
$(this).next().hide();
});
$(this).next().show();
}
});
I thought this would work to make all the sub menu's hide and then show the one that had been clicked on. For some reason nothing happens. I have checked the console (firebug) and there is no error shown.
Getting frustrated with it now! :-/
EDIT: Here is the answer:
$(document).ready(function() {
$("#nav ul li a[href^='#']").each(function(){
$(this).parent().next().hide();
$(this).click(function() {
if ($(this).parent().next().is(':visible')) {
$(this).parent().next().hide();
} else {
$("#nav ul li a[href^='#']").each(function(){
$(this).parent().next().hide();
});
//then reshow and label the clicked nav
$(this).parent().next().show();
}
});
});
});

HTML:
<div id="nav">
<ul>
<li>
Nav main 1
<ul>
<li>sub 1</li>
<li>sub 2</li>
<li>sub 3</li>
<li>sub 4</li>
</ul>
</li>
<li>
Nav main 2
<ul>
<li>sub 1</li>
<li>sub 2</li>
<li>sub 3</li>
<li>sub 4</li>
</ul>
</li>
</ul>
</div>
JavaScript:
var s = $('#nav ul ul').hide();
$('#nav a').click(function() {
var u = $(this).next();
u.is(':visible') ? u.hide() : ( s.hide(), u.show() );
return false;
});
Live demo: http://jsfiddle.net/Tq6LM/1/

Never mind... I have figured it out. Writing it out again must have helped. I needed to call the .parent()
Seems that i was trying to call the next a href, i needed to call the next list!

DEMO: http://so.devilmaycode.it/jquery-and-selecting-the-next-list-items-objects
your Javascript Code should be:
$(function() {
$('#main-nav li').click(function(e) {
e.preventDefault();
$('#main-nav li ul').slideUp(500);
$(this).find('ul:not(:visible)').slideDown(500);
});
});
little bit of CSS
#main-nav li ul { display:none }
your HTML should look like this:
<ul id="main-nav">
<li>Nav main 1
<ul>
<li>sub 1</li>
<li>sub 2</li>
<li>sub 3</li>
<li>sub 4</li>
</ul>
</li>
<li>Nav main 2
<ul>
<li>sub 1</li>
<li>sub 2</li>
<li>sub 3</li>
<li>sub 4</li>
</ul>
</li>
</ul>