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Hide div by default and show it on click with bootstrap

I want to show and hide a div, but I want it to be hidden by default and to be able to show and hide it on click. Here is the code that I have made :
<a class="button" onclick="$('#target').toggle();">
<i class="fa fa-level-down"></i>
</a>
<div id="target">
Hello world...
</div>

Here I propose a way to do this exclusively using the Bootstrap framework built-in functionality.
You need to make sure the target div has an ID.
Bootstrap has a class "collapse", this will hide your block by
default. If you want your div to be collapsible AND be shown by
default you need to add "in" class to the collapse. Otherwise the
toggle behavior will not work properly.
Then, on your hyperlink (also works for buttons), add an href
attribute that points to your target div.
Finally, add the attribute data-toggle="collapse" to instruct
Bootstrap to add an appropriate toggle script to this tag.
Here is a code sample than can be copy-pasted directly on a page that already includes Bootstrap framework (up to version 3.4.1):
Toggle Foo
<button href="#Bar" class="btn btn-default" data-toggle="collapse">Toggle Bar</button>
<div id="Foo" class="collapse">
This div (Foo) is hidden by default
</div>
<div id="Bar" class="collapse in">
This div (Bar) is shown by default and can toggle
</div>

Just add water style="display:none"; to the <div>
Fiddles I say: http://jsfiddle.net/krY56/13/
jQuery:
function toggler(divId) {
$("#" + divId).toggle();
}
Preferred to have a CSS Class .hidden
.hidden {
display:none;
}

Try this one:
<button class="button" onclick="$('#target').toggle();">
Show/Hide
</button>
<div id="target" style="display: none">
Hide show.....
</div>

I realize this question is a bit dated and since it shows up on Google search for similar issue I thought I will expand a little bit more on top of #CowWarrior's answer. I was looking for somewhat similar solution, and after scouring through countless SO question/answers and Bootstrap documentations the solution was pretty simple. Again, this would be using inbuilt Bootstrap collapse class to show/hide divs and Bootstrap's "Collapse Event".
What I realized is that it is easy to do it using a Bootstrap Accordion, but most of the time even though the functionality required is "somewhat" similar to an Accordion, it's different in a way that one would want to show hide <div> based on, lets say, menu buttons on a navbar. Below is a simple solution to this. The anchor tags (<a>) could be navbar items and based on a collapse event the corresponding div will replace the existing div. It looks slightly sloppy in CodeSnippet, but it is pretty close to achieving the functionality-
All that the JavaScript does is makes all the other <div> hide using
$(".main-container.collapse").not($(this)).collapse('hide');
when the loaded <div> is displayed by checking the Collapse event shown.bs.collapse. Here's the Bootstrap documentation on Collapse Event.
Note: main-container is just a custom class.
Here it goes-
$(".main-container.collapse").on('shown.bs.collapse', function () {
//when a collapsed div is shown hide all other collapsible divs that are visible
$(".main-container.collapse").not($(this)).collapse('hide');
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
Toggle Foo
Toggle Bar
<div id="Bar" class="main-container collapse in">
This div (#Bar) is shown by default and can toggle
</div>
<div id="Foo" class="main-container collapse">
This div (#Foo) is hidden by default
</div>

using a modal overlay with twitter bootstrap scrollspy - incorrect activation

I have a nav menu bar based on twitter bootstrap that uses scrollspy to for hightlighting.
this works by matching the value after the # in a link (e.g. <a href="#foo"> when <div id="foo"> scrolls into view). pretty basic, here's the doco: http://twitter.github.com/bootstrap/javascript.html#scrollspy
my problem comes when I introduce a link to a bootstrap modal dialogue box within an element that is being spied on. imagine I have:
<ul class="nav">
<li>a link</li>
<li>modal</li>
<li>a different link</li>
</ul>
<p> .. my page .. </p>
<div id="info"><a name="info"></a>info on my product</div>
<div id="products"><a name="products"></a>a list of my products</div>
<div class="modal hide fade" id="demo" tabindex="-1" role="dialog">
<div class="modal-header">my header</div>
<div class="modal-body">some content</div>
<div class="modal-footer"><button>close</button></div>
</div>
<p> .. more page </p>
the div that represents my modal overlay also uses the #id-of-target format for its href, but since it's included inside the nav (of course) then scrollspy ALSO highlights when the (hidden) div is in view. Depending on where the modal code in on the page, this confuses the menu system's highlighting.
I can see that scrollspy should be modified to only link to items that are visible (and therefore not activate when "demo" scrolls into view) but can't work out how to modify the plugin to only fire if the element is visible, or override the event some other way.
can anyone give me some pointers?

funny how typing out a question sometimes makes you think in the right way to solve it, where just thinking about it does not.
to make this work, I modified the scrollspy component of bootstrap so that it tests the target is hidden and bails out of the activate routine (also doesn't raise the activated event, since it's not active)
here it is: around line 1432 for me (+if ..
, activate: function (target) {
var active
, selector
if (target.is(":hidden")) return
this.activeTarget = target

How to show the description of the elements that are listed on the sidebar on the body using show & hide javascript or JQuery?

I have 11 elements with long description of each element of them. I decided to display the elements on the sidebar and the description of each one of them will be displayed on the body directly when the user clicks on the element.
I came with a solution similar to this ONE
but the problem with this one is put the content (or description) inside the javascript code, and I want the description be on the HTML code to make it later on flexible for changes by the admin after putting the data including the description of these elements on the database instead of hard-coded style.
Therefore, how can I do that?

You can try this way
<div id="menu">
<ul>
<li id="a">item a
<div id="contentA" style="display:none">Description of item A</div>
</li>
<li id="b">item b
<div id="contentB" style="display:none">Description of item A</div>
</li>
</ul>
</div>
<div id="content"></div>
<script type="text/javascrip">
$(document).ready( function () {
$('#a').click(function() {
$('#content').html($('#contentA').html());
});
$('#b').click(function() {
$('#content').html($('#contentB').html());
});
});
<script>

I updated your example, it now uses hidden divs inside the clickable menu items, and on li click it finds the menu description and displays it.
This method does not depend on ids and degrades more gracefully (except if the client doesn't support JS but supports CSS display).

Your description is a bit unprecise, but if I get it right your could use IDs for the description text and fade them in/out with jQuery.
http://jsfiddle.net/PajFP/14/ (updated)

jQuery Accordion needs to ALWAYS show table in each div

I am using an accordion style menu to toggle the next div area when you click its parent h3 element.
$(document).ready(function() {
$('div.accordian-content> div').hide();
$('div.accordian-content> h3').click(function() {
$(this).next('div').slideToggle('medium')
.siblings('div:visible').slideUp('medium');
});
});
the code works fine with the following structure.
<div class='accordian-content'>
<h3>Some title</h3>
<div>content to be toggled</div>
</div>
The problem is that I'm trying to use a table in between the h3 and the next div and I want the table to always be shown, but when you put a table in there the parent h3 toggling breaks.
<div class='accordian-content'>
<h3>Covers </h3>
<table id='covers'>Table content </table>
<div>Ajax content</div>
</div>
Any advice would be greatly appreciated, as I have spent way to much time on this silly thing.

Replace next('div') with nextAll('div') and you should be fine. http://jsfiddle.net/VJCV9/

As far as know, tables dont slideUp() and also, should </div be </div>? $(this).next('div') needs to be .next(table).children(div)

How a Javascript Accordion Works?

I would like to create my own accordion component without using any AJAX toolkits, mostly for learning purposes. I am not sure quite where to start with this one. I'm assuming I would begin by creating div's for each section in the accordion. Perhaps each div would contain a header, which would be the actual button selected to move the accordion to that section. I am not sure the correct approach to take once an accordion's section button is selected though. Would I use the z-order, so that each section is of a higher z-order? Any help is appreciated.
Thanks

I would highly recommend picking up a book such as John Resig's Pro JavaScript techniques that will give you some ideas and initial thoughts about how to approach bulding your own client-side solutions.
Essentially, you would have an element to act as a header, for example <h1> or <div> under which you would have a <div> with an initial style of display: none;. Set up an event handler on the click event of the header to change the style of the div below to display: block and ensuring that any other content <div>s are hidden (do this by using a CSS class on each content <div> for example).
I'll leave the smooth animation to you as an exercise for how it might be accomplished. As a hint, I would recommend looking at how a JavaScript library like jQuery handles animation, by checking out the source.

The best way to order it would be like this
<div id="accordion">
<h3 class="accordion title">Title</h3>
<div class="accordion section">
Section Content
</div>
<h3 class="accordion title">Title 2</h3>
<div class="accordion section">
Section Content
</div>
<h3 class="accordion title">Title 3</h3>
<div class="accordion section">
Section Content
</div>
<h3 class="accordion title">Title 4</h3>
<div class="accordion section">
Section Content
</div>
</div>
You would want to avoid z-order entirely because it is a compatibility mess. Instead you would have the accordion titles be what you would click to open the accordion. You would want to set all of the accordion section <div>'s to visibility:hidden; by default, and then, when one of them is clicked, change it's visibility, and hide all the others. If you want it to work with any amount of accordion sections, you would have it count each <h3 class="accordion title"> and each <div class="accordion section">, and pair those up into an array. When a title is clicked, show it's corresponding div. Alternatively you could give each one a separate ID, but the first way would be much more useful.
Actually, it might be display:none; instead of visibility:hidden;, I would try both.
In addition it's worth mentioning that the animation is usually handled by changing things like the size of the div, so if you were hiding a section, you would make the height smaller and smaller until it reaches 0 and is hidden.

See this question, you will notice my answer contains a demo with the basic workings that should get you started. It was only asked a few minutes ago!
It uses jQuery.