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Tuesday, December 15, 2009

Manually adjustable Float-drop multilevel dropdown menu

A quick recap on how to make the Float-Drop dropper dropdown manually adjustable, for those who really need this menu to support variable width links.

Is the same as the Float-Drop menu, but with some more customization.

Demonstration of the Dropdown:

Example

HTML Code for the dropdown:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>TH - CSS Only Multilevel Dropdown</title>
<style type="text/css">
/***reset default styling***/
.nav,
.nav ul{
    list-style-type:none;
    margin:0;
    padding:0;
}
.nav a {
    text-decoration:none;
}
/*CUSTOMIZATION*/
/*i have split the code to have the width/height/color separate from the rest of the code*/
/*COLORS*/
/*here are some default colors, funky colors used for distinctive visibility*/
/*i hope that you can handle colors customization on your own :p*/
.nav {
    background:yellow;
}
.nav a {
    background:#9C3;
    color:#000;
}
.nav ul {
    background:red; /*top link persistent background color*/
}
.nav a.main {
    background:transparent; /*so that the top link persistent background works*/
}
.nav ul a.main {
    background:yellow;
}
.nav a.main:hover {
    background:orange;
}
.nav .sub ul a {
    background:#CC6;
}
.nav .sub ul a.main {
    background:yellow;
}
.nav .sub ul a.main:hover {
    background:orange;
}
.nav a:hover,
.nav a:focus,
.nav a:active{
    background:orange;
}
.nav .sub li a:hover,
.nav .sub li a:focus,
.nav .sub li a:active{
    background:#C93;
}

/*WIDTH (!IMPORTANT)*/
/*change each width value below, else the dropdown will stop working (:hover will still work in modern browsers because of the opera fix)*/
/*set the link width here*/
.nav .link,
.nav a {
    width:9em; /*same as width*/
}
.nav ul li {
/*force ie8 to float-drop*/
    max-width:9em; /*same as width*/
}
/*set the sublink left shift width here (same as width)*/
.nav ul ul {
/*move the sublinks to the side, so they dont overlap*/
    left:9em; /*same as width*/
}
.nav li.reversed ul { /*reverse the direction of sublinks for the last dropdown*/
    left:auto;
    right:9em; /*same as width*/
}
/*add the negative value of "width - 1px" here (because css can't do math)*/
/*or (width - 0.063em) where 0.063em is 1px on 16px base size*/
.nav a {
/*makes the links very thin, so that the sublinks can hide inside the main link*/
/*!IMPORTANT: if you want a width of 9em, then you will have to change the value below to 8.937em (because: 9 - 0.063 = 8.973)*/
    margin-right:-8.937em; /*make this width - 1px*//*or width - 0.063em (0.063 = 1px)*/
}

/*<customized width and positioning>*/
/*ONE*/
.nav .link.one {
    margin-right:20px;
}
.nav .link.one,
.nav .one a {
    width:11em;
}
.nav .one ul li {
    max-width:11em;
}
.nav .one ul ul {
    left:11em;
}
.nav .one a {
    margin-right:-10.937em; /*11 - 0.063 = 10.937em (0.063 = 1px)*/
}
/*TWO*/
.nav .link.two {
    margin-right:20px;
}
.nav .link.two,
.nav .two a {
    width:3em;
}
.nav .two ul li {
    max-width:3em;
}
.nav .two ul ul {
    left:3em;
}
.nav .two a {
    margin-right:-2.937em; /*3 - 0.063 = 2.937em (0.063 = 1px)*/
}
/*THREE*/
.nav .link.three {
    margin-right:2px;
}
.nav .link.three,
.nav .three a {
    width:9em;
}
.nav .three ul li {
    max-width:9em;
}
.nav li.reversed.three ul { /*this is because its reversed*/
    right:9em; /*same as width*/
}
.nav .three a {
    margin-right:-8.937em;
}
/*</customized width and positioning>*/








/*HEIGHT*/
.nav {
    height:1.563em; /*you could remove this and clear the float differently, but to me this makes the most sense*/
}
.nav a {
    padding:.2em 0; /*apply padding to links, to vertically center them, be careful with horizontal padding in IE5, correct width must be maintained*/
}
.nav a.main {
    height:1.563em; /*needs to be the same as the persistent background trick and so that the sublevels are properly aligned*/
    line-height:1.563em; /*not really necessary, but in this specific case it vertically centers the main link text*/
    overflow:hidden; /*making it more bulletproof*/
    padding:0; /*remove the padding that was applied above*/
}
.nav ul {
    padding-top:1.563em; /*persistent background trick*/
    margin-top:-1.563em; /*persistent background trick*/
}
.nav ul ul {
    position:relative; /*so that it can be moved top/left*/
    top:-1.563em; /*this is the sole reason why the main links must have a fixed height*/
}


/*Dropper Dropdown*/
/*supports up to 4 sub-levels in IE5-7, more can be added*/
/*modern browsers already support any amount of sublevels*/
/*made by Timo Huovinen*/

.nav li {
    float:left; /*fixes several IE related bugs, and allows for clearing*/
}
.nav ul {
    float:left; /*necessary for float drop*/
}
.nav ul li {
    clear:left; /*must clear the floated list item inside sublist*/
}
.nav a {
    position:relative; /*needs to have a position, to be above the rest*/
    display:block;
}
.nav a.main {
    float:left; /*necessary for float drop*/
    margin-top:10000px; /*bring the links back into view*/
}
.nav .link,
.nav .sub {
    margin-top:-10000px; /*hide the links and their containers, opera has low upper limits*/
}
.nav ul {
    margin-bottom:-5000px; /*avoid any interaction between the sub's, can be any large size*/
}
/*the main trick, removes the negative right-margin and causes float drop*/
.nav a:hover,
.nav a:focus,
.nav a:active{
    margin-right:0;
}

/*OPERA fix*/
.nav ul:hover {
    clear:left; /*fix for opera sublinks flickering on :hover*/
}
/*background no longer needed*/
.nav ul ul {
    background:transparent;
}


/*IE5-6 + 7 bug fixes*/
.nav .sub {
    width:100%;
}
/*empty rule to fix occassional IE6 tabbing bug, one of the weirdest bug's i have seen.
it seems that this indexes the links together as one? does not happen for everyone, but im leaving it just in case.*/
a, a:hover, a:active, a:focus {}
</style>
<!--I would also suggest adding some javascript to delay the closing of the sublinks, just to make it even better-->
</head>
<body>
<a href="#background1">background 1</a>
<ul class="nav">
<li class="link one">
    <a class="main" href="#">Main</a>
    <ul>
        <li><a href="#1">test1</a></li>
        <li><a href="#2">test2</a></li>
        <li class="sub"><a class="main" href="#3">main 1 »</a>
                    <ul>
                        <li><a href="#subtest1">sub test 1</a></li>
                        <li><a href="#subtest2">sub test 2</a></li>
                        <li><a href="#subtest3">sub test 3</a></li>
                        <li><a href="#subtest4">sub test 4</a></li>
                        <li><a href="#subtest5">sub test 5</a></li>
                        <li><a href="#subtest6">sub test 6</a></li>
                    </ul>
        </li>
        <li class="sub"><a class="main" href="#4">main 2 »</a>
                    <ul>
                        <li><a href="#subtest1">sub test 1</a></li>
                        <li><a href="#subtest2">sub test 2</a></li>
                        <li><a href="#subtest3">sub test 3</a></li>
                        <li><a href="#subtest4">sub test 4</a></li>
                        <li><a href="#subtest5">sub test 5</a></li>
                        <li><a href="#subtest6">sub test 6</a></li>
                    </ul>
        </li>
        <li><a href="#5">test5</a></li>
        <li><a href="#6">test6</a></li>
        <li><a href="#7">long text link showing what happens</a></li>
        <li><a href="#8">test8</a></li>
        <li class="sub"><a class="main" href="#9">Everything is possible</a>
                    <ul>
                        <li><a href="#subtest1">sub test 1</a></li>
                        <li><a href="#subtest2">sub test 2</a></li>
                        <li><a href="#subtest3">sub test 3</a></li>
                        <li><a href="#subtest5">sub test 5</a></li>
                        <li><a href="#subtest6">sub test 6</a></li>
                    </ul>
        </li>
    </ul>
</li>
<li class="link two">
    <a class="main" href="#">Main</a>
    <ul>
        <li><a href="#1">test1</a></li>
        <li><a href="#2">test2</a></li>
        <li><a href="#3">test3</a></li>
        <li><a href="#4">test4</a></li>
        <li><a href="#5">test5</a></li>
        <li><a href="#6">test6</a></li>
        <li><a href="#7">test7</a></li>
    </ul>
</li>
<li class="link reversed three">
    <a class="main" href="#">Main</a>
    <ul>
        <li><a href="#1">test1</a></li>
        <li><a href="#2">test2</a></li>
        <li><a href="#3">test3</a></li>
        <li class="sub"><a class="main" href="#4">test4 »</a>
                    <ul>
                        <li><a href="#subtest1">sub test 1</a></li>
                        <li><a href="#subtest2">sub test 2</a></li>
                        <li><a href="#subtest3">sub test 3</a></li>
                        <li><a href="#subtest4">sub test 4</a></li>
                        <li><a href="#subtest5">sub test 5</a></li>
                        <li><a href="#subtest6">sub test 6</a></li>
                    </ul>
        </li>
        <li><a href="#5">test5</a></li>
        <li><a href="#6">test6</a></li>
        <li class="sub"><a class="main" href="#7">test7 »</a>
                    <ul>
                        <li><a href="#subtest1">sub2 test 1</a></li>
                        <li><a href="#subtest2">sub2 test 2</a></li>
                        <li><a href="#subtest3">sub2 test 3</a></li>
                        <li><a href="#subtest4">sub2 test 4</a></li>
                        <li><a href="#subtest5">sub2 test 5</a></li>
                        <li><a href="#subtest6">sub2 test 6</a></li>
                    </ul>
        </li>
    </ul>
</li>
</ul>
<a href="#background2">background 2</a>


</body>
</html>

It has just some extra classes and css rules, to make life easier for those who need this, I have also removed some of the sublevels to make it look neater.

Terms of use:

The software referenced within this license is distributed free of charge and free from any warranty. It may be used freely for any purpose whatsoever. The author created and released this work because he is genuinely a Nice Person!

Users are encouraged to use, modify, distribute, improve and otherwise manipulate the code. After all, it’s free.

The author sincerely hopes that end users enjoy and appreciate the hard work that went into creating it, and would appreciate being referenced in future modifications of the code since it was based on the author’s original concept and work.

Users are nonetheless encouraged to provide reciprocity whenever possible as it provides positive reinforcement and encouragement to the author. Furthermore, the minimum reciprocation I ask is to leave a ‘thank you’ comment in the area below:

9 comments:

BangaVet.com said...

Thanks, I will try to use it for my site.. I am not from computer field but I make websites for vets. Thanks a lot again.

Pascal said...

thanks for the great work.
I find it weird though that you need your dropdown boxes to be as wide as the menu-item. In the original menu, this wasn't the case. Any solution for this problem?

Timo Huovinen said...

#Pascal yeah there is, you can set the link to be as wide as you want, as long as you set the negative margin right on it to be almost the same as it's width.

.nav .link.two, .nav .two a {
width: 10em;
}
.nav .two a {
margin-right: -9.937em;
}

Vikram Rao said...

Excellent work. Just could not figure-out one thing. How do we get some padding / margin on to the left side of the links as they stick to the edges of drop-down. I tried changing but it is changing the entire width. Any suggestions please?

Timo Huovinen said...

@Vikram Rao I don't entirely understand what you mean, reduce the width and add the margin maybe?
Could you clarify?

Vikram Rao said...

Well if you see all the link's text is touching the left edge of the dropdowns. How can we have some padding on the left side? I have made a pictorial representation for ease of understanding. Please see the picture here : http://vikramrao.com/menu.jpg

Timo Huovinen said...

@Vikram Rao thank you for the picture but I am afraid that is not possible with this menu, because if you move the mouse cursor away from any menu item at any time the menu will close.

Anonymous said...

thank you

Anonymous said...

Thank you

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