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
cevahir 9 years ago
Great tutorial !Thanks for sharing.
Reply
Architektur Visualisierung 9 years ago
Good Info. Thank you!
Reply
Blackcode 9 years ago
I have a problem under firefox... if i roll over the flash player menu it causes to restart... I works fine unde IE see it in action on http://enachedragos.com/
Reply
Tyler 3 years ago
If you're still having trouble with implementing the code you can view my source for a little guidance. I have it implemented at http://www.australianbetting.org/ on the home page. Hope this helps.
Reply
Blackcode 9 years ago
the problem resides HERE:
\'position\':\'absolute\' - \'position\':\'relative\'

Anyone can Help???
------------------------------------------------------------

$(\'#dock\').css({\'height\': default_dock_height, \'position\':\'relative\', \'top\': body_height});
Reply
faith 9 years ago
hi thanks for the tutorial first of all!

i have a question, i see two scrollers at firefox and safari and that looks so bad...

the scroller inside scroolls the content so thats already there all the time, but the one at the outside part, when scrolled, it reveals the dock menu, i dont think i should be seeing it, right?

how can i get rid of that outer scroller?

thanks in advance
Reply
Jason 9 years ago
Just made a simple .aspx page with this and when you load the page initially it does what the above comment says. Produces the scrollbar for the "fake-body" but also produces a scroll bar which scrolls down to see the whole dock. Once you mouse over the dock for the first time the outer scroll bar disapears and it works fine there on in.
Reply
Graham 9 years ago
This is just fantastic, looks like solving a lot of problems for me. I'm only new to doing websites &, coming from an animation background, was sticking to working mostly in flash, but I'm starting to realise the benifits of java.
What's really got me stuck on this one though, is that I need to centre the dock content horizontally. Is there something I can add to the javascript that will let me do this?
Reply
sman1ganggalombok utara 9 years ago
aku gaq ngerti tentang koding di atas tak cobaq malah hancur... salam kenal maklum baru di blog...
Reply
sman1ganggalombok utara 9 years ago
i don't understand about that Code... i try to paste that.. But My blog be broke.. Huhuh... Can u tell me about that all coding??
i'm Newbie.. ^^
nice to know you...
Reply
Venkat 9 years ago
How do i add content to the dock - i mean, if i add some text within the dock div, then it goes in the header. I need it in the dock 'body'
Reply
kiki 8 years ago
Your article has been a great help. Thank you.
Reply
Tom 8 years ago
Excellent work!! Thanks.
Reply
Alex 8 years ago
Doesn't work if your page's content exceeds the viewpoint. Tested on latest version of FF.
Reply