Tutorials

jQuery Dock Menu Tutorial Revisit - Dock at Bottom

Written by Kevin Liew on 15 Jun 2009
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56 comments

Introduction

Alright, just before we start, you might want to read this post - Dock Content Tutorial with jQuery and jQuery Easing Plugin. That tutorial teaches us how to create a dock at the top of a website. I have received many requests in the comment section and my emails, so I have decided to make a revisit. In this tutorial, we're going to learn how to make it dock at the bottom.

However, we are going to enhance this dock even better and smarter.

  • Reduce the amount of HTML and CSS code
  • Smarter javascript to handle the height and position
  • Graceful degradation, make sure the dock display correctly even if javascript is disabled.

Dock at the bottom is different with the one on the top, we have some questions to answer. For example, the browser scrollbar problem. What if the page length is too long? How are we going to set the position of the dock and so on.

Please refer to the image below:

Structure for jQuery Scroll To Tab Menu

There are two sections:

  • #fake_body : With this DIV, we will able to solve the page length problem. We will set the overflow to auto, so that it will display a scrollbar. The height of this DIV is always calculated with jQuery to make sure the browser's default scrollbar is hidden. The height of #fake_body equal to the height of browser window minus the dock's height.
  • #dock : We will use javascript to set the position to absolute and top value for this DIV. In case browser doesnt support javascript, everything will just display correctly.

1. HTML

It's so simple and clean, I guess, I don't have to explain anything about it. :)

<div id="fake-body">

	<!-- Put your entire website in this section -->

</div>

<div id="dock">
	<!-- Put your dock in this section -->
</div>

2. CSS

There are three things:

  1. BODY : body's margin and padding must set to 0, otherwise, it will mess up the height calculation in jQuery.
  2. #fake-body : Overflow is set to auto, so that a scroll bar is displayed.
  3. #dock : You need to set the Expanded Height for the #dock. It's has two reasons: if javascript is disabled, the dock in full size will be displayed in the bottom of the page and we will need it for jquery calculations (position and height for #fake_body and #dock).
/* 
margin and padding must be 0,
otherwise, you have to set it in jQuery
*/
body {
margin:0; 
padding:0
}

#fake-body {
overflow:auto;
z-index:1;
}

#dock {
background:#ccc;
height:200px;
z-index:100;
width:100%;
}

3. Javascript

I have put comments in every single lines, if you have any questions, please drop me a comment.

$(document).ready(function() {

	//Transition you want :)
	var easing_type = 'easeOutBounce';
	
	//The default height for the dock (on mouse out)
	var default_dock_height = '40';
	
	//Expanded height, the height of the dock on mouse over, you have to set it in CSS
	var expanded_dock_height = $('#dock').height();
	
	//Fake body height
	var body_height = $(window).height() - default_dock_height;
	
	//Set the size of #fake_body
	$('#fake-body').height(body_height);
	
	//Set the CSS attribute for #dock
	$('#dock').css({'height': default_dock_height, 'position':'absolute', 'top': body_height});
	
	//In case the user resize the browser, we will need to recalculate the height and top for #fake_body and #dock
	$(window).resize(function () {
		
		//Grab the updated height/top
		updated_height = $(window).height() - default_dock_height;
		
		//Set the updated height for #fake_body and top for #dock
		$('#fake-body').height(updated_height);		
		$('#dock').css({'top': updated_height});
	});
		
	//The main event for the dock bottom menu
	$('#dock').mouseover(function () {
		
		//Recalculate expanded height (always get the latest height), in case user has resized the window
		expanded_height = $(window).height() - expanded_dock_height;
		
		//Animate the height change, set the height to expanded_dock_height and set the top value as well
		$(this).animate({'height':expanded_dock_height,'top': expanded_height},{queue:false, duration:800, easing: easing_type});
		
	}).mouseout(function () {
		
		//Recalculate default body height (always get the latest height), in case user has resized the window
		body_height = $(window).height() - default_dock_height;
		
		//Animate the height change, set the height to default_dock-height and set the top value as well
		$(this).animate({'height':default_dock_height,'top': body_height},{queue:false, duration:800, easing: easing_type});
		
	});
	
});

Conclusion

That's it. I'm so tempted to create a plugin for this. Anyway, make sure you check out the demo and download the source code to play with it. If you have created your own, feel free to drop your link in the comment section to show off! : )

Last but not least, I need your support :) If you like this article, please help me to promote it by adding this post into your bookmark. Or you can subscribe to my RSS for more jQuery tutorial posts! Thanks!

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56 comments
PedidoDireto 10 years ago
*add the line in css to fix the bug.\r\n*overflow-y:hidden;\r\n\r\n\r\nbody {\r\noverflow-y:hidden;\r\nmargin:0; \r\npadding:0;\r\n}
Reply
Pedido Direto 10 years ago
add the line in body the css to fix the bugoverflow-y:hidden;
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Pedido Direto 10 years ago
line: overflow-y:hidden;
Reply
themeheven 10 years ago
WOW good tutorial. Thanks!
Reply
NuBy 10 years ago
I've implemented this great dock menu into a web page I'm currently working on and it works great but whenever I click on a link anywhere on the page, including from within the dock, the whole page goes white!? Yet, the scroll btn within the dock does work?! If I take out the html for the dock, the links work fine. What am I doing wrong? - Please help!
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kevin Admin 10 years ago
@NuBy: that's weird, in my code, it has nothing to do with links. Can you send me your work?
Reply
qyne 10 years ago
how to add links for menu
Reply
Cory 10 years ago
Great tip. I have been looking everywhere for something like this.

I am having issue with the expanding feature though, and was wondering how I can remove that aspect and just have the bottom bar be static?

Thanks.
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Cory 10 years ago
I got it. Setting the height in the fake page the same as the dock. Was said above, just missed it.
Reply
Shitic 10 years ago
I just didn't know how I put a variable, which was designated before, into a css rule in jquery. This example is great to solve my problem.
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YCFX 9 years ago

how to make the script am activate when the mouse hovers over a différent links ?
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kevin Admin 9 years ago
Hi, you can change this to the link's id/class:
$('#dock').mouseover(function () { ......

havent tested it, but it should work.
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Hendriono 9 years ago
Great tips... Thanks alot friend... i will try it before... Thanks
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