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slideDown function needs two click to work

I'm having a slideDown function on my site. But somehow it doesn't work the first time when you click it. So I need to click two times to make the function work. What can possible be wrong?
I also want the div to slide up when I click on the button again, don't know how I will do this. I tried using slideToggle but it just ended up with the div going up and down a couple of times before closing. Even for this I needed to click two times.
Here is my JS:
function showCart() {
$("#rollDown").click(function() {
$("#shopping_cart_page").slideDown();
});
/* not relevant for this */
emptyBag = document.getElementById("emptyBag");
emptyBag.addEventListener("click", emptyCart);
}
And here is my HTML:
<div id="navbar">
<ul>
<li>Products</li>
<li>About</li>
<li>Giveaways</li>
<li>Contact </li>
<li><a id="rollDown">Shopping Bag</a></li>
</ul>
</div>

Here's a simple example:
jQuery:
$(document).ready(function(){ // Just adding the click event inside the document ready method should do the trick for you.
$("#rollDown").click(function() {
$("#shopping_cart_page").slideToggle();
});
});
HTML
<input type="submit" id="rollDown" value="Toggle"/>
<div id="shopping_cart_page">Hi</div>
Fiddle: http://jsfiddle.net/64gn1unk/

appendChild not working on some elements

I'm working on a vanilla javascript project so I cannot use jQuery. I'm trying to use the following to move some HTML from one placement to another:
parent.appendChild(element);
I'm trying to place the forms into a different placement as I placed in the comment in my HTML code. I'm trying this but it's not working at all.
Javascript:
var loginButton = document.querySelector('[data-login-header-button]');
var loginDropdown = document.querySelector('[data-login-dropdown]');
var shopCartButton = document.querySelector('[data-shopping-cart-header-button]');
var shopCartDropdown = document.querySelector('[data-shopping-header-cart]');
shopCartButton.parentNode.appendChild(shopCartDropdown);
loginButton.parentNode.appendChild(loginDropdown);
HTML:
<header>
<nav data-nav-services>
<ul class="nav-services">
<li data-test>
<a class="icon icon-shopping-cart icon-arrow-down" href="#" data-shopping-cart-header-button>
shopping cart
</a>
<!-- PLACEMENT FOR data-shopping-header-cart -->
</li>
<li>
<a class="icon icon-user icon-arrow-down" href="#" data-login-header-button>
Login
</a>
<!-- PLACEMENT FOR data-login-dropdown -->
</li>
</ul>
</nav>
<form class="login-dropdown" data-login-dropdown>
...CONTENT...
</form>
<form class="shopping-cart" data-shopping-header-cart>
..CONTENT..
</form>
</header>
The strange thing is that if I turn around the selectors (as here below) it does work and I cannot explain why...
shopCartDropdown.parentNode.appendChild(shopCartButton);
shopCartDropdown.parentNode.appendChild(loginButton);

When you do:
shopCartButton.parentNode.appendChild(shopCartDropdown);
loginButton.parentNode.appendChild(loginDropdown);
It actually works. It is just not showing anything since the forms are empty. Check your Dev Tools and inspect your HTML.

For anybody who wish to know, the code was perfect. The issue was that I was appending this form elsewhere of my code. So there was a conflict as one had a priority over the other. I could use .cloneNode(true) as a solution. I ended transforming that appending to my new goal and solved the issue.
Anybody out there... check all the code for any other appending of the same element. Good advice ;)

How to run javascript code on menu click

I'm creating a squarespace website in which I have a navigation bar.
I would like to add a javascript code as a link in the navigation bar.
The javascript code is the following:
<div>
<script type="text/javascript" src="https://app.ecwid.com/script.js?4549118"></script>
<script type="text/javascript"> xMinicart("style=","layout=Mini"); </script>
</div>
I have the following html code: (I got it with FireBug)
<nav id="main-navigation">
<ul class="cf">
<li class=" active-link">
page1
</li>
<li class="">
page2
</li>
</ul>
</nav>
I cannot edit the code above but I'm able to inject header code.
So, how can I add the javascript code as a third link in the navigation bar?
Thanks a lot!
edit
So I've added the following code
<script>
window.onload=function(){
$('nav ul').append('<li><a onClick="test()" href="javascript:void(0);">Link 3</a></li>');
}
</script>
but I need the original javascript code within the append. I need the actual code to be the link. How do I do that? If you see the javascript in Firefox you'll understand what I mean. I need the actual link it generates in the navigation bar.
Thanks!

window.onload=function(){
$('nav ul').append('<li><a onClick="yourFunction()" href="javascript:void(0);">Link 3</a></li>');
}
Since you specify you don't have direct access to the html. Only the header.
This will add your menu item with a link, that upon click, executes the function yourFunction(). It will add this item as soon as the page loads.
Note: You need jQuery for the above. But it is also possible with raw Js.

Changing the div content with a link in an div which leads to an externa

I have a task to solve and I am quite new in js and stuff, so please help me out on this.
I've got this in php(I use php cause I need to use databases as well):
What I want is to put external html contents in the container without reloading the whole page. Lets call the external contents link1.html;link2.html...
When load the page I want the container with the content of link1.html whick is also available and can be recalled by clicking link1.
I tried jquery and stuff but it was not really work for me. I'd like to use external js or ajax or jquery or something like that.
Please help!!!
Thank you in advance for everyone!
<div id="links">
<ul>
<li id="link1">link1</li>
<li id="link2">link1</li>
<li id="link3">link1</li>
<li id="link4">link1</li>
</ul>
</div>
<div id="container"></div>

You can use load(), $.get() or $.ajax for loading stuff, an example:
<div id="links">
<ul>
<li id="link1"><a href='path'>link1</a></li>
...
</ul>
</div>
$('#links a').on('click', function(event) {
event.preventDefault();
$('#container').load(this.href);
});

How to open a new jsp page with JavaScript

I have the following dropdown menu how can i redirect each menu to corresponding page by clicking each of menu? is it possible by using one javascript function if yes how?
thanks in advance...
<div>
<ul>
<li id=home onclick="show(this.id)">Home</li>
<li id=collection onclick="show(this.id)>Collection</li>
<ul>
<li id=men onclick="show(this.id)>Men</li>
<li id=women onclick="show(this.id)>Women</li>
</ul>
<li id=contact onclick="show(this.id)>Contact</li>
</ul>
</div>

Yes you can.
Use window.open("URL") in your case URL is this.id
Also you can update window.location
read more here http://www.tizag.com/javascriptT/javascriptredirect.php
Like Niko said you need closing quotes
.. onclick="window.open(this.id)" ..

If you only need o JS function to redirect based on a parameter that, in your case, is the component ID, this will do the work:
<script type="text/javascript">
var show = function(id) {
window.location.href = id + '.jsp';
};
</script>
If you want to navigate DOM and get link's href attribute use:
document.getElementById(id).firstChild.href
Considering that the first element inside the component referred by ID is a link tag.

Try this?
$("div > ul li a").click(function() {
window.location.href += "/" + $(this).parent()[0].id;
});
I tried to use a selector that didn't modify your HTML, so that's why it looks so icky.

This makes no sense.
I understand that your particular functional requirement is to invoke the link when the enduser clicks somewhere in the space of the <li> outside the link. To achieve that just set the CSS display property of the <a> element to block. This way the link will span the entire space of its parent element.
<ul id="menu">
<li>Home</li>
<li>Collection</li>
<ul>
<li>Men</li>
<li>Women</li>
</ul>
<li>Contact</li>
</ul>
with this CSS
#menu li a {
display: block;
}
No need for ugly JavaScript hacks. Opening a new JSP page location in the current window is by the way to performed by window.location = 'some.jsp';. But this is not necessary if you use the right solution for the concrete problem. In the future questions, try to elaborate more about the functional requirement instead of concentrating only on the solution of which you thought that it's the right solution for the particular functional requirement.