展开和折叠响应式菜单

Question

在移动设备大小时，我可以让这个菜单默认折叠并使用切换来折叠和展开的最佳方法是什么。

我希望这只是 CSS，但我不确定如何做。

这是我工作的来源。 http://www.script-tutorials.com/demos/335/index.html

/* common and top level styles */
#nav span {
    display: none;
}
#nav, #nav ul {
    list-style: none outside none;
    margin: 0;
    padding: 0;
}
#nav {
    background-color: #F5F5F5;
    border-bottom: 5px solid #333333;
    float: left;
    margin-left: 1%;
    margin-right: 1%;
    position: relative;
    width: 98%;
}
#nav ul.subs {
    background-color: #FFFFFF;
    box-shadow: 1px 1px 5px rgba(0, 0, 0, 0.2);
    color: #333333;
    display: none;
    left: 0;
    padding: 2%;
    position: absolute;
    top: 54px;
    width: 96%;
}
#nav > li {
    border-bottom: 5px solid transparent;
    float: left;
    margin-bottom: -5px;
    text-align: left;
    -moz-transition: all 300ms ease-in-out 0s;
    -ms-transition: all 300ms ease-in-out 0s;
    -o-transition: all 300ms ease-in-out 0s;
    -webkit-transition: all 300ms ease-in-out 0s;
    transition: all 300ms ease-in-out 0s;
}
#nav li a {
    display: block;
    text-decoration: none;
    -moz-transition: color 450ms ease-in-out 0s, background-color 450ms ease-in-out 0s;
    -ms-transition: color 450ms ease-in-out 0s, background-color 450ms ease-in-out 0s;
    -o-transition: color 450ms ease-in-out 0s, background-color 450ms ease-in-out 0s;
    -webkit-transition: color 450ms ease-in-out 0s, background-color 450ms ease-in-out 0s;
    transition: color 450ms ease-in-out 0s, background-color 450ms ease-in-out 0s;
    white-space: normal;
}
#nav > li > a {
    color: #333333;
    display: block;
    font-size: 1.3em;
    line-height: 49px;
    padding: 0 15px;
    text-transform: uppercase;
}
#nav > li:hover > a, #nav > a:hover {
    background-color: #F55856;
    color: #FFFFFF;
}
#nav li.active > a {
    background-color: #333333;
    color: #FFFFFF;
}

/* submenu */
#nav li:hover ul.subs {
    display: block;
}
#nav ul.subs > li {
    display: inline-block;
    float: none;
    padding: 10px 1%;
    vertical-align: top;
    width: 33%;
}
#nav ul.subs > li a {
    color: #777777;
    line-height: 20px;
}
#nav ul li a:hover {
    color: #F55856;
}
#nav ul.subs > li > a {
    font-size: 1.3em;
    margin-bottom: 10px;
    text-transform: uppercase;
}
#nav ul.subs > li li {
    float: none;
    padding-left: 8px;
    -moz-transition: padding 150ms ease-out 0s;
    -ms-transition: padding 150ms ease-out 0s;
    -o-transition: padding 150ms ease-out 0s;
    -webkit-transition: padding 150ms ease-out 0s;
    transition: padding 150ms ease-out 0s;
}
#nav ul.subs > li li:hover {
    padding-left: 15px;
}

/* responsive rules */
@media all and (max-width : 980px) {

#nav {
  display: none;
}

#burger:hover #nav {
  display: block;
}


    #nav > li {
        float: none;
        border-bottom: 0;
        margin-bottom: 0;
    }
    #nav ul.subs {
        position: relative;
        top: 0;
    }
    #nav li:hover ul.subs {
        display: none;
    }
    #nav li #s1:target + ul.subs,
    #nav li #s2:target + ul.subs {
        display: block;
    }

    #nav ul.subs > li {
        display: block;
        width: auto;
    }
}

 <ul id="nav">
        <li><a href="index.html#">Home</a></li>
        <li><a href="index.html#s1">Menu 1</a>
            <span id="s1"></span>
            <ul class="subs">
                <li><a href="index.html#">Header a</a>
                    <ul>
                        <li><a href="index.html#">Submenu x</a></li>
                        <li><a href="index.html#">Submenu y</a></li>
                        <li><a href="index.html#">Submenu z</a></li>
                    </ul>
                </li>
                <li><a href="index.html#">Header b</a>
                    <ul>
                        <li><a href="index.html#">Submenu x</a></li>
                        <li><a href="index.html#">Submenu y</a></li>
                        <li><a href="index.html#">Submenu z</a></li>
                    </ul>
                </li>
            </ul>
        </li>
        <li class="active"><a href="index.html#s2">Menu 2</a>
            <span id="s2"></span>
            <ul class="subs">
                <li><a href="index.html#">Header c</a>
                    <ul>
                        <li><a href="index.html#">Submenu x</a></li>
                        <li><a href="index.html#">Submenu y</a></li>
                        <li><a href="index.html#">Submenu z</a></li>
                    </ul>
                </li>
                <li><a href="index.html#">Header d</a>
                    <ul>
                        <li><a href="index.html#">Submenu x</a></li>
                        <li><a href="index.html#">Submenu y</a></li>
                        <li><a href="index.html#">Submenu z</a></li>
                    </ul>
                </li>
            </ul>
        </li>
        <li><a href="index.html#">Menu 3</a></li>
        <li><a href="index.html#">Menu 4</a></li>
        <li><a href="index.html#">Menu 5</a></li>

    </ul>

Answer 1

我已将导航包装在一个 div 中。添加了一个按钮，并在移动尺寸时打开和关闭导航。以及在全宽时隐藏汉堡按钮。

<div class="nav-bar">
  <div id="burger">
    <input type="button" data-name="show" value="Toggle" id="toggle">
  </div>
  <!--rest of navigation follows here-->
</div>


<script>
$(document).ready(function () {
        $("#burger").click(function () {
            if ($(this).data('name') == 'show') {
                $("#nav").animate({
                    height: '0px'
                }).hide()

                $(this).data('name', 'hide')
            } else {
                $("#nav").animate({
                    height: '100%'
                }).show()

                $(this).data('name', 'show')
            }
        });
    });
</script>