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jquery menu issue on load

I created a menu in my website, this menu have 4 submenu.
But there is a problem on page reload / page load.
This is my page: http://www.substellar.it/nepsrl/
if you try to refresh the page, you'll notice that the 4 sub menus for one second are still visible.
Why?
This is the script that manages the submen:
http://www.substellar.it/nepsrl/js/menu.js
I can not solve this annoying problem graph.

This happens because you hide your menu after page is loaded. Instead of use $( ".nep-submenu1" ).hide();, you should hidde your menu on your html or css like this:
html:
<div class="nep-submenu1" style="display: none;">
css:
.nep-submenu1{
display:none;
}

addClass in JQuery

I am pretty new in JQuery and I have a question about addClass(). I spent some time to try to get this working, but seems like I did something wrong. I created a top menu with HTML and bootstrap. I assume visitors will land on my index.php first, so I created the class="active" for my index.php. Then if they click on any other link on the top menu (ex. About Us), then the class="active" will add to the and remove the class="active" from the "li" tab for index.php.
Below is my HTML code:
<div class="nav-collapse collapse">
<ul class="nav pull-right">
<li id="home" class="active"> Home</li>
<li id="about"> About Us</li>
<li id="browse"> Browse</li>
<li id="contact"> Contact</li>
</ul>
</div>
And below is the JQuery code that I use and try to get this done.
$(function (){
var sidebar = $('.nav');
sidebar.delegate("li", "click", function(){
if($(this).hasClass('active')){
//If click on the tab that is currently active, it will do nothing.
}else{
sidebar.find('.active').addClass('inactive');
sidebar.find('.active').removeClass('active');
$(this).removeClass('inactive');
$(this).addClass('active');
}
});
});
I tested it out on my local server. I could see the tab in my top menu turned to grey after I clicked it, but it didn't stay. So I am sure I did something wrong, but not sure where. I am really new in JQuery, so I hope I can learn from you guys. thank you!

When the link is clicked on, it takes the browser to a whole new page which starts a whole new javascript environment and nothing you've done to the current page carries over to the newly loaded page.
Thus the active class may be changed on the current page, but then a whole new page loads which inherits nothing from the first page (e.g. it's starts over from scratch). Your code from the first page is no longer in play once the new page is loaded.
You need to either just code the active class into each separate page (since each page knows what page it is) or have one common set of JS that sets the active class when the page loads based on the URL so it is intialized properly when the page loads.
Also, you probably don't need an inactive class. The default CSS state can represent the inactive look and the active class can apply a CSS override to show the active state.

This is not working, because when someone clicks on another link, they are redirected to a different page. However, your header doesn't really know which link was clicked on nor which page it is on. You need to let your header know which page you are. Does this make sense?

The other answers are correct, when you click on the tag you are opening a new page and therefore losing your javascript environment.
If you want to have a single page app, you can use preventDefault to stop the browser from following the link.
sidebar.delegate("li", "click", function(e){
e.preventDefault();
if($(this).hasClass('active')){
//If click on the tab that is currently active, it will do nothing.
}else{
sidebar.find('.active').addClass('inactive');
sidebar.find('.active').removeClass('active');
$(this).removeClass('inactive');
$(this).addClass('active');
}
});

Fade in different section with static header and footer using javascript?

i was wondering how to create a dynamic website where the page layout is as follows:
header, section, footer
The header and footer would always be static and when the user clicks a part of the nav e.g About Us (within the header) the section in the middle dynamically changes and fades in the About Us section.
I would like to use pure javascript if possible and without it being part server-side, I assume you would give the sections ID's and in the javascript "onClick" of the nav link, the one section would display:none and another section would display in replace of it.
I found a similar example on this website: http://www.templatemonster.com/demo/44858.html
What is the easiest way to create this effect? I have a VERY brief idea but how could you go about this?
If anyone could include a jsfiddle example, would be much apprieciated

What you are looking to do is called pjax. Pjax uses XML Http requests(ajax) to load a specific piece of content into a placeholder like you are trying to do.
Someone clicks to a new page.
Javascript requests this page from the server.
Once loaded, optionally fade out the old content.
Replace with the new content and optionally fade it in.
Use pushstate to add a state to the browser history. This allows the back and forward buttons to work.
Here is a pjax library that is handy for doing this easily across new and old browsers and has a good explanation:
https://github.com/defunkt/jquery-pjax
It would not be a good idea to include all of the content on one page with display:none because then it will still need to be downloaded by the browser even if the user never views it. Nevertheless, here is a JSfiddle showing this approach which is close to what you described:
http://jsfiddle.net/Tb4eQ/
//Wait for html to be loaded
$(document).ready(function(){
//Store reference to frame to load content into in a var, as well as the content to load in.
var $content = $('#div_1');
var $frame = $('#my_frame');
//Bind an event handler to the click event of something
$('#press').on('click', function(){
//fade out the frame, swap in the new content, and fade it back in.
$frame.fadeOut('fast', function(){
$frame.html($content.html()).fadeIn('fast');
})
});
});

You can use the jQuery method .load() which loads data from the server and place the returned HTML into the matched elements. Also the .toggle() method allows you display or hide elements.
Consider the following example: Suppose we have a page named index.html ...
<header>
<nav>
<ul><li id="nav-about">About us</li></ul>
</nav>
</header>
<section>
<article id="dynamic-viewer">
Dynamic content will be placed here!
</article>
</section>
<aside>
<div id="loader" style="display:none">
<img src="http://www.ajaxload.info/images/exemples/24.gif" />
</div>
</aside>
... and we have another file named about.html which is just a view:
<div>
<h2>About us</h2>
<p>This content is placed dynamically into #dynamic-viewer</p>
</div>
Now, I will load the content of about.html into the content wrapper in index.html using the jQuery.load() method.
//Click handler to load the "about" view
$(document).on("click.about", '#nav-about', function() {
fnShowLoading(true);
//Loads the content dynamically
$('#dynamic-viewer').load('views/about.html', function() {
fnShowLoading(false);
});
});
//Shows or hides the loading indicator
function fnShowLoading (show) {
$('#loader').toggle(!!show);
}
Actually, the only lines that matters here are:
//loads the content dynamically
$('#dynamic-viewer').load('views/about.html', function() { });
//shows or hides the loader section
$('#loader').toggle(!!show);

You could try to use Ajax calls to partially refresh parts of the page or just load the whole thing and let jQuery handle the hiding and showing of elements on click events.
http://www.w3schools.com/ajax/
http://api.jquery.com/hide/

Prevent full page from flashing before showing a tab

Currently I am using the twitter bootstrap tabs on a page with the following code. I added a bit of javascript/jquery to push hash tags in the url, so I can actually link to a tab. This works fine, but the when I load the first tab I see the whole page and then I am quickly shown just the first tab. Now, if I click tabs on the page everything works nicely and I am not shown the whole page again. This flash of data is annoying to say the least. Any ideas on what I am doing wrong?
Jade Template Code, compiles down to standard HTML
div(class="tabbable")
ul(id="myTab", class="nav nav-tabs")
li
a(href="#surveyEditData", data-toggle="tab") Survey
li
a(href="#surveyEditQuestions", data-toggle="tab") Questions
...etc...
JavaScript code:
$(function(){
// Function to activate the tab
function activateTab() {
var activeTab = $('[href=' + window.location.hash.replace('/', '') + ']');
activeTab && activeTab.tab('show');
}
// Trigger when the page loads
activateTab();
});

You are seeing the delay in the HTML being rendered before the Javascript is done executing.
To fix this, you need to put an initial CSS style such as fade or hide to all the other tabs, except the first one.
CSS rules are executed immediately during rendering, so there will be no delay for these rules.

Loading an external .htm file into a div with javascript

So I got this code
Javascript:
<script type="text/javascript">
$(function(){
$('.ajax') .click(function(e){
e.preventDefault()
$('#content').load( 'file.htm' )
})
})
</script>
html:
Link
it works perfectly in firefox, but nothing happens when I click the link in chrome and IE simply opens a new window with the file. any advice?

I am not a coder of any sort, and I know there is more than one way to make this work.
This is what worked for me for MY situation.
I had a working site but with A LOT of code / DIV content all in one page and I wanted to clean that up.
I hope this Helps someone else!
I have been searching for this solution for quite some time and I have run across many examples of how it can work in different instances.
My scenario was as follows:
I have a photography website that uses a series of DIV tags containing the various "pages" so to speak of the site.
These were all set as:
<div id="DivId" style="display:none"></div>
The following script in the head of the page:
$(document).ready(function(){
$('a').click(function () {
var divname= this.name;
$("#"+divname).show("slow").siblings().hide("slow");
});
});
</script>
and called using the anchor links like this:
HOME
Where name was the name of the DIV to be called.
Please note the DIV will be called inside the parent container DIV.
Lastly and most importantly for this particular question and scenario, the DIV were all placed on the page as shown above.
Each div content was created just as if it were within the DIV tags but minus the opening and closing DIV tags and then saved as a separate .txt file, and called by placing this is the head of the parent page:
src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.js">
and
$(document).ready(function() { // this runs as soon as the page is ready (DOM is loaded)
$("#DivName") // selecting "div" (you can also select the element by its id or class like in css )
.load("PathToFile.txt");// load in the file specified
$("#AnotherDiv").load("AnotherFile.txt");// Additional DIV can be added to populate DIVs on th eparent page.
});

Change the link to href="#" or "javascript:void(0);return false;"
<a class='ajax' href='#'>...</a>
The loading logic is all in your ajax call. But, you have also a link which points to the file, too.
So, it seems that some browsers give different priorities on how the click is handled.
Anyway, links that do something other than changing page (f.ex. executing js) shouldn't have an explicit HREF attribute other than something that "does nothing" (like above)

I believe the problem is that the script loads before the document is loaded.
try this:
$(document).ready(function (){
$('.ajax').click(function(e){
e.preventDefault()
$('#content').load( 'file.htm' )
});
});
I am not sure, but i can not see any other problem.