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CSS3+Js implementation of responsive navigation bar method

高洛峰Original: 2017-03-10 10:08:061550browse

This article introduces the CSS3+Js method of implementing a responsive navigation bar

Today I made a responsive navigation bar that can automatically change the navigation bar with different screen resolutions or browser window sizes. Style, the main thing used here is CSS3 Media Query. For details, you can check out the article A Brief Talk on Responsive Layout. I won’t spend a lot of space introducing it here. I mainly look at how to make this navigation bar.

It should also be mentioned that ie6-ie8 does not support CSS3 Media Query, so we need special treatment for ie6-ie8 and let them maintain the default style, which is both important for layout and style. Take this into account.

First look at the layout, the html code is as follows:

Copy code The code is as follows:

<p class="navBar">
    <p class="nav">
        <ul id="menu">
            <li class="current"><a href="#">首页</a></li>
            <li><a href="#">电影</a></li>
            <li><a href="#">电视剧</a></li>
            <li><a href="#">动漫</a></li>
            <li><a href="#">综艺</a></li>
            <li><a href="#">纪录片</a></li>
            <li><a href="#">公开课</a></li>
        </ul>
        <p class="hot">
            <a href="#">钢铁侠3</a>
            <a href="#">中国合伙人</a>
            <a href="#">盛夏晚晴天</a>
            <a href="#">陆贞传奇</a>
        </p>
        <!--判断浏览器是否是IE9,IE10或者是非IE浏览器-->
        <!--[if (gt IE 8) | !(IE)]><!-->
        <h1 class="title" id="title">
            <a href="#">风驰网</a>
            <span class="btn" id="btn"></span>
        </h1>
        <!--<![endif]-->
    </p>
</p>

The html part also needs a conditional comment. When the browser is ie6-8, mount a class "ie6-8" to the html tag, which facilitates processing in the style sheet:

Copy code The code is as follows:

<!DOCTYPE html>
<!--[if lt IE 9]><html class="ie6-8"><![endif]-->
<html>
...

The following is the style control, first process the overall style and ie6-ie8

Copy code The code is as follows:

* {margin: 0; padding: 0;}
body {font: 14px/22px "宋体", arial, serif;}

.navBar {margin-top: 80px; width: 100%; height: 38px; background: #333;}

.nav {margin: 0 auto; border: 0px solid #ccc;}
.nav ul {list-style: none; width: auto;}
.nav ul li {height: 38px; text-align: center;}
.nav ul li a {display: block; font-size: 16px; color: #fff; text-decoration: none; line-height: 39px;}

.ie6-8 .nav {width: 1000px; height: 38px;}
.ie6-8 .nav ul li {float: left;}
.ie6-8 .nav ul li a {padding: 0 30px 0 30px;}
.ie6-8 .nav ul li.current {background: #f60;}
.ie6-8 .nav ul li:hover a {color: #f60;}
.ie6-8 .nav ul li a:hover {_color: #f60;}/*IE6 Hack*/
.ie6-8 .nav ul li.current:hover a {color: #fff;}

.ie6-8 .nav .hot {float: left; margin-left: 20px; padding-top: 8px;}
.ie6-8 .nav .hot a {padding: 0 5px 0 5px; font-size: 12px; color: #fff; text-decoration: none;}
.ie6-8 .nav .hot a:hover {color: #f60; text-decoration: underline;}

.ie6-8 .nav .title {display: none;}

ok, Media Query will be used below.

When the screen width is greater than 1000px:

Copy code The code is as follows:

@media screen and (min-width: 1000px) {
    .nav {width: 1000px; height: 38px;}

    .nav ul li {float: left; width: auto;}
    .nav ul li a {padding: 0 30px 0 30px;}
    .nav ul li.current {background: #f60;}
    .nav ul li:hover a {color: #f60;}
    .nav ul li.current:hover a {color: #fff;}

    .nav .hot {margin-left: 20px; padding-top: 8px;}
    .nav .hot a {padding: 0 5px 0 5px; font-size: 12px; color: #fff; text-decoration: none;}
    .nav .hot a:hover {color: #f60; text-decoration: underline;}

    .nav .title {display: none;}
}

When the screen width is When between 640px and 1000px:

Copy code The code is as follows:

@media screen and (min-width: 640px) and (max-width: 1000px) {
    .nav {width: auto; height: 38px;}

    .nav ul li {float: left; width: 14%; min-width: 50px;}

    .nav ul li.current {background: #f60;}
    .nav ul li:hover a {color: #f60;}
    .nav ul li.current:hover a {color: #fff;}

    .nav .hot {display:none;}
    .nav .title {display: none;}
}

When the screen width is less than 640px:

Copy code The code is as follows:

@media screen and (max-width: 640px) {
    .navBar {margin-top: 0; height: auto; background: #444;}
    .nav {width: auto; height: auto;}

    .nav ul li {margin-top: 1px; width: 100%; min-width: 100px;background: #333;}

    .nav ul li a:active {background: #f60;}

    .nav .hot {display:none;}

    .nav .title {position: relative; width: 100%; height: 38px; border-top: 1px solid #444; background: #333; text-align: center; font:normal 20px/35px "Microsoft YaHei", arial, serif; letter-spacing: 2px;}
    .nav .title a {color: #f60; text-decoration: none;}
    .nav .title .btn {position: absolute; right: 10px; top: 0; width: 34px; height: 34px; padding: 2px; background: url(btn.png) center center no-repeat; cursor: pointer;}
}

ok, the layout and style control is complete, and the effect is there, in 3 different states The effect is as follows:

CSS3+Js implementation of responsive navigation bar method

#But for the third picture, we also want an effect, that is, click on the right The menu can be retracted when the icon in the lower corner is displayed, so how to do this? This can be achieved with js. When the menu is in the collapsed state, click the picture menu to expand it; when the menu is in the expanded state, click the icon menu to collapse it, and it also needs animation effects. ok, let’s take a look at js, but I won’t go into details about js. Let’s post the core code:

This part of the code is used to produce animation effects:

Copy code The code is as follows:

var move = function (obj, target) {
    var timer;
    clearInterval(timer);
    timer = setInterval(function () {
        var speed = (target - obj.offsetTop)/3;
        speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);
        if (Math.abs(obj.offsetTop - target) < 4) {
            clearInterval(timer);
            obj.style.marginTop = target + "px";
        } else {
            obj.style.marginTop = obj.offsetTop + speed + "px";
        }
    }, 30);

}

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