这是一款基于bootstrap4的滑动侧边栏特效。该滑动侧边栏使用bootstrap4框架，通过css和jquery来完成隐藏侧边栏，当点击打开侧边栏按钮时，侧边栏会以动画的方式滑动出来。
使用方法
在页面中引入jquery和bootstrap4相关文件。
<link href="css/bootstrap.min.css" rel="stylesheet">
<script src="js/jquery-1.11.0.min.js" type="text/javascript"></script>
<script src="js/bootstrap.min.js"></script>
HTML结构
侧边栏的HTML结构如下：
<nav class="navbar navbar-expand-md navbar-dark bg-dark navbar-offcanvas">
<div class="container-fluid">
<a class="navbar-brand" href="#">Navbar</a>
<ul class="navbar-nav navbar-top">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
</ul>
<button class="navbar-toggler navbar-toggler-right navbar-icon" type="button" data-toggle="collapse" data-target="#navbar-mobile" aria-controls="navbar-mobile" aria-expanded="false" aria-label="Toggle navigation">
<span class="icon-bar bar1"></span>
<span class="icon-bar bar2"></span>
<span class="icon-bar bar3"></span>
</button>
<div class="navbar-collapse collapse ml-auto" id="navbar-mobile">
<ul class="navbar-nav ml-auto">
<li class="nav-image">
<img src="logo.png" alt="">
</li>
<li class="nav-item">
<a href="#!" class="nav-link">Link 1</a>
</li>
<li class="nav-item">
<a href="#!" class="nav-link">Link 2</a>
</li>
<li class="nav-item">
<a href="#!" class="nav-link">Link 3</a>
</li>
</ul>
</div>
</div>
</nav>
页面的内容放置在wrapperclass的div容器中。
<div class="wrapper">
...
</div>
CSS样式
为侧边栏添加下面的CSS样式。
.wrapper { transition: all 0.5s cubic-bezier(0.685, 0.0473, 0.346, 1); }
.navbar {
height: 75px;
transition: all .5s .1s;
}
.navbar-offcanvas { z-index: 1030; }
.navbar-offcanvas .container-fluid {
position: relative;
padding: 0;
transform: translate3d(0px, 0, 0);
transition: all 0.5s cubic-bezier(0.685, 0.0473, 0.346, 1);
}
.navbar-offcanvas .navbar-top { display: none; }
@media (min-width: 992px) {
.navbar-offcanvas .navbar-top {
display: flex;
margin-left: auto;
}
}
.navbar-offcanvas .navbar-top .nav-item {
margin-right: 22px;
text-align: center;
}
@media (max-width: 991px) {
.navbar-offcanvas .navbar-top .nav-item .nav-link { color: #000; }
}
.navbar-offcanvas .navbar-toggler {
padding: 0;
border: 0;
outline: none;
}
.navbar-offcanvas .navbar-toggler:hover, .navbar-offcanvas .navbar-toggler:focus { cursor: pointer; }
@media (min-width: 768px) {
.navbar-offcanvas .navbar-toggler { display: block; }
}
.navbar-offcanvas .navbar-toggler .icon-bar {
display: block;
position: relative;
width: 24px;
height: 2px;
border-radius: 1px;
background-color: #fff;
}
.navbar-offcanvas .navbar-toggler .icon-bar + .icon-bar { margin-top: 4px; }
.navbar-offcanvas .navbar-toggler .icon-bar.bar1 {
top: 0;
outline: 1px solid transparent;
animation: topbar-back 500ms 0s;
animation-fill-mode: forwards;
}
.navbar-offcanvas .navbar-toggler .icon-bar.bar2 {
outline: 1px solid transparent;
opacity: 1;
}
.navbar-offcanvas .navbar-toggler .icon-bar.bar3 {
bottom: 0;
outline: 1px solid transparent;
animation: bottombar-back 500ms 0s;
animation-fill-mode: forwards;
}
.navbar-offcanvas .navbar-toggler.toggled .icon-bar.bar1 {
top: 6px;
animation: topbar-x 500ms 0s;
animation-fill-mode: forwards;
}
.navbar-offcanvas .navbar-toggler.toggled .icon-bar.bar2 { opacity: 0; }
.navbar-offcanvas .navbar-toggler.toggled .icon-bar.bar3 {
bottom: 6px;
animation: bottombar-x 500ms 0s;
animation-fill-mode: forwards;
}
.navbar-offcanvas .navbar-collapse.collapse, .navbar-offcanvas .navbar-collapse.collapse.in, .navbar-offcanvas .navbar-collapse.collapsing { display: none !important; }
.nav-open .navbar-collapse { transform: translate3d(0px, 0, 0); }
.nav-open .navbar > .container-fluid { transform: translate3d(-424px, 0, 0); }
@media (max-width: 991px) {
.nav-open .navbar > .container-fluid { transform: translate3d(-282.6666666667px, 0, 0); }
}
.nav-open .wrapper { transform: translate3d(-150px, 0, 0); }
body > .navbar-collapse {
display: block !important;
position: fixed;
top: 0;
right: -10px;
width: 424px;
height: 100%;
padding: 60px 1rem;
background-color: #fff;
border-left: 1px solid #e3e3e3;
text-align: center;
visibility: visible;
overflow-y: visible;
transform: translate3d(424px, 0, 0);
transition: all 0.5s cubic-bezier(0.685, 0.0473, 0.346, 1);
z-index: 1032;
}
body > .navbar-collapse:after {
content: "";
position: absolute;
top: 28px;
left: -20px;
border-left: 10px solid #fff;
border-top: 10px solid transparent;
border-bottom: 10px solid transparent;
border-right: 10px solid transparent;
transform: rotate(180deg);
transition: all 0.5s cubic-bezier(0.685, 0.0473, 0.346, 1);
z-index: 1032;
}
@media (max-width: 991px) {
body > .navbar-collapse { width: 282.6666666667px; }
}
body > .navbar-collapse .nav-image { margin-bottom: 65px; }
body > .navbar-collapse .nav-image img {
display: block;
margin: 0 auto;
border: 1px solid rgba(0, 0, 0, 0.14);
width: 91px;
height: 69px;
}
body > .navbar-collapse .navbar-top {
margin: 0 !important;
flex-direction: column;
}
@media (min-width: 992px) {
body > .navbar-collapse .navbar-top { display: none; }
}
body > .navbar-collapse .navbar-top li { text-align: center; }
body > .navbar-collapse .navbar-top li a {
display: block;
padding: .5rem 1rem;
font-weight: 700;
color: #000;
}
body > .navbar-collapse .navbar-top li a:hover, body > .navbar-collapse .navbar-top li a:focus { text-decoration: none; }
body > .navbar-collapse .nav-link, body > .navbar-collapse .dropdown-toggle {
font-weight: 700;
color: #222;
transition: color .2s ease-out;
}
body > .navbar-collapse .nav-link:hover, body > .navbar-collapse .nav-link:focus, body > .navbar-collapse .dropdown-toggle:hover, body > .navbar-collapse .dropdown-toggle:focus { text-decoration: none; }
body > .navbar-collapse .nav-link.disabled, body > .navbar-collapse .dropdown-toggle.disabled { color: rgba(0, 0, 0, 0.35); }
body > .navbar-collapse .nav-link.disabled:hover, body > .navbar-collapse .nav-link.disabled:focus, body > .navbar-collapse .dropdown-toggle.disabled:hover, body > .navbar-collapse .dropdown-toggle.disabled:focus { cursor: not-allowed; }
@media (min-width: 992px) {
body > .navbar-top { display: none; }
}
body > #overlay {
content: "";
position: fixed;
top: 0;
left: auto;
right: calc(282.6666666667px - 10px);
width: 100%;
height: 100%;
opacity: 0;
overflow-x: hidden;
z-index: 1029;
}
@media (min-width: 992px) {
body > #overlay { right: calc(424px - 10px); }
}
@keyframes
topbar-x { 0% {
top: 0px;
transform: rotate(0deg);
}
45% {
top: 6px;
transform: rotate(145deg);
}
75% {
transform: rotate(130deg);
}
100% {
transform: rotate(135deg);
}
}
@keyframes
topbar-back { 0% {
top: 6px;
transform: rotate(135deg);
}
45% {
transform: rotate(-10deg);
}
75% {
transform: rotate(5deg);
}
100% {
top: 0px;
transform: rotate(0);
}
}
@keyframes
bottombar-x { 0% {
bottom: 0px;
transform: rotate(0deg);
}
45% {
bottom: 6px;
transform: rotate(-145deg);
}
75% {
transform: rotate(-130deg);
}
100% {
transform: rotate(-135deg);
}
}
@keyframes
bottombar-back { 0% {
bottom: 6px;
transform: rotate(-135deg);
}
45% {
transform: rotate(10deg);
}
75% {
transform: rotate(-5deg);
}
100% {
bottom: 0px;
transform: rotate(0);
}
}
CSS样式
最后通过下面的js代码来完成侧边栏的显示和隐藏。
var window_height;
var window_width;
var navbar_initialized = false;
var nav_toggle;
var offCanvas = {
sidenav: {
// Sidenav is not visible by default.
// Change to 1 if necessary
sidenav_visible: 0
},
initSideNav: function initSideNav() {
if (!navbar_initialized) {
var $nav = $('nav');
// Add the offcanvas class to the navbar if it's not initialized
$nav.addClass('navbar-offcanvas');
// Clone relevant navbars
var $navtop = $nav.find('.navbar-top').first().clone(true);
var $navbar = $nav.find('.navbar-collapse').first().clone(true);
// Let's start with some empty vars
var ul_content = '';
var top_content = '';
// Set min-height of the new sidebar to the screen height
$navbar.css('min-height', window.screen.height);
// Take the content of .navbar-top
$navtop.each(function() {
var navtop_content = $(this).html();
top_content = top_content + navtop_content;
});
// Take the content of .navbar-collapse
$navbar.children('ul').each(function() {
var nav_content = $(this).html();
ul_content = ul_content + nav_content;
});
// Wrap the new content inside an <ul>
ul_content = '<ul class="navbar-nav sidebar-nav">' + ul_content + '</ul>';
// Insert the html content into our cloned content
$navbar.html(ul_content);
$navtop.html(top_content);
// Append the navbar to body,
// and insert the content of the navicons navbar just below the logo/nav-image
$('body').append($navbar);
$('.nav-image').after($navtop);
// Set the toggle-variable to the Bootstrap navbar-toggler button
var $toggle = $('.navbar-toggler');
// Add/remove classes on toggle and set the visiblity of the sidenav,
// and append the overlay. Also if the user clicks the overlay,
// the sidebar will close
$toggle.on('click', function () {
if (offCanvas.sidenav.sidenav_visible == 1) {
$('html').removeClass('nav-open');
offCanvas.sidenav.sidenav_visible = 0;
$('#overlay').remove();
setTimeout(function() {
$toggle.removeClass('toggled');
}, 300);
} else {
setTimeout(function() {
$toggle.addClass('toggled');
}, 300);
// Add the overlay and make it close the sidenav on click
var div = '<div id="overlay"></div>';
$(div).appendTo("body").on('click', function() {
$('html').removeClass('nav-open');
offCanvas.sidenav.sidenav_visible = 0;
$('#overlay').remove();
setTimeout(function() {
$toggle.removeClass('toggled');
}, 300);
});
$('html').addClass('nav-open');
offCanvas.sidenav.sidenav_visible = 1;
}
});
// Set navbar to initialized
navbar_initialized = true;
}
}
};
$(document).ready(function () {
window_width = $(window).width();
nav_toggle = $('nav').hasClass('navbar-offcanvas') ? true : false;
if (window_width < 992 || nav_toggle) {
offCanvas.initSideNav();
}
// Close the sidebar if the user clicks a link or a dropdown-item,
// and close the sidebar
$('.nav-link:not(.dropdown-toggle), .dropdown-item').on('click', function () {
var $toggle = $('.navbar-toggler');
$('html').removeClass('nav-open');
offCanvas.sidenav.sidenav_visible = 0;
setTimeout(function () {
$toggle.removeClass('toggled');
}, 300);
});
});
$(window).resize(function () {
window_width = $(window).width();
// More responsive checks if the user resize the browser
if (window_width < 992) {
offCanvas.initSideNav();
}
if (window_width > 992 && !nav_toggle) {
$('nav').removeClass('navbar-offcanvas');
offCanvas.sidenav.sidenav_visible = 1;
navbar_initialized = false;
}
});
该bootstrap4滑动侧边栏特效的codepen地址为：https://codepen.io/moso/pen/LjvRep
