javascript - 如何将菜单从悬停更改为单击

Question

我有一个使用 ul/li 编写的菜单，并使用下面的 css 来处理鼠标悬停。现在我需要将鼠标悬停行为更改为单击。怎么做？请帮忙。

#nav {
        float: left !important;
        font: bold 12px Century Gothic, Arial Rounded MT Bold, Arial, Helvetica, Sans-serif;
        border: 1px solid #121314;
        border-top: 1px solid #2b2e30;
        -webkit-border-radius: 5px;
        -moz-border-radius: 5px;
        border-radius: 5px;
        
}



#nav ul {
        margin:0;
        padding:0;
        list-style:none;
}

#nav ul li {
        float:left !important;
}

#nav ul li a {
        float: left !important;
        color:deepskyblue;
        padding: 10px 20px;
        text-decoration:none;
        background:#3C4042;
        background: -webkit-gradient( linear, left bottom, left top, color-stop(0.09, rgb(59,63,65)), color-stop(0.55, rgb(72,76,77)), color-stop(0.78, rgb(75,77,77)) );
        background: -moz-linear-gradient( center bottom, rgb(59,63,65) 9%, rgb(72,76,77) 55%, rgb(75,77,77) 78% );
        background: -o-linear-gradient( center bottom, rgb(59,63,65) 9%, rgb(72,76,77) 55%, rgb(75,77,77) 78% );
        box-shadow: 0 1px 0 rgba(255, 255, 255, 0.1) inset, 0 0 5px rgba(0, 0, 0, 0.1) inset;
        border-left: 1px solid rgba(255, 255, 255, 0.05);
        border-right: 1px solid rgba(0,0,0,0.2);
        text-shadow: 0 -1px 1px rgba(0, 0, 0, 0.6);
}

#nav li ul {
        background:#3C4042;
        background-image: -webkit-gradient( linear, left bottom, left top, color-stop(0.09, rgb(77,79,79)), color-stop(0.55, rgb(67,70,71)), color-stop(0.78, rgb(69,70,71)) );
        background-image: -moz-linear-gradient( center bottom, rgb(77,79,79) 9%, rgb(67,70,71) 55%, rgb(69,70,71) 78% );
        background-image: -o-linear-gradient( center bottom, rgb(77,79,79) 9%, rgb(67,70,71) 55%, rgb(69,70,71) 78% );
        border-radius: 0 0 10px 10px;
        -moz-border-radius: 0 0 10px 10px;
        -webkit-border-radius: 0 0 10px 10px;
        left: -999em;
        margin: 35px 0 0;
        position: absolute;
        width: 160px;
        z-index: 9999;
        box-shadow: 0 0 15px rgba(0, 0, 0, 0.4) inset; 
        -moz-box-shadow: 0 0 15px rgba(0, 0, 0, 0.4) inset; 
        -webkit-box-shadow: 0 0 15px rgba(0, 0, 0, 0.4) inset; 
        border: 1px solid rgba(0, 0, 0, 0.5);
}

#nav li ul a {
        background: none;
        border: 0 none;
        margin-right: 0;
        padding-top:3px;
        padding-bottom:3px;
        width: 120px;
        box-shadow: none;
        -moz-box-shadow: none;
        -webkit-box-shadow: none;
        border-bottom: 1px solid transparent;
        border-top: 1px solid transparent;
        text-align:left;
}

#nav ul li a:hover,
#nav ul li:hover > a {
        color: White;
        background:#5C9ACD;
        background: -webkit-gradient( linear, left bottom, left top, color-stop(0.09, rgb(77,79,79)), color-stop(0.55, rgb(67,70,71)), color-stop(0.78, rgb(69,70,71)) );
        background: -moz-linear-gradient( center bottom, rgb(77,79,79) 9%, rgb(67,70,71) 55%, rgb(69,70,71) 78% );
        background: -o-linear-gradient( center bottom, rgb(77,79,79) 9%, rgb(67,70,71) 55%, rgb(69,70,71) 78% );
        text-shadow: 0 1px 0 rgba(255, 255, 255, 0.2), 0 -1px #000;

}

#nav li ul a:hover, 
#nav ul li li:hover > a  {
    color: White;
        background: #5C9ACD;
        background: -webkit-gradient( linear, left bottom, left top, color-stop(0.17, rgb(61,111,177)), color-stop(0.51, rgb(80,136,199)), color-stop(1, rgb(92,154,205)) );
        background: -moz-linear-gradient( center bottom, rgb(61,111,177) 17%, rgb(80,136,199) 51%, rgb(92,154,205) 100% );
        background: -o-linear-gradient( center bottom, rgb(61,111,177) 17%, rgb(80,136,199) 51%, rgb(92,154,205) 100% );
        border-bottom: 1px solid rgba(0,0,0,0.6);
        border-top: 1px solid #7BAED9;
        text-shadow: 0 1px rgba(255, 255, 255, 0.3);
}



#nav li:hover ul {
        left:auto;
}


#nav li li ul {
        margin: -1px 0 0 160px;
        -webkit-border-radius: 0 10px 10px 10px;
        -moz-border-radius: 0 10px 10px 10px;
        border-radius: 0 10px 10px 10px;
        visibility:hidden;
}

#nav li li:hover ul {
        visibility:visible;
}

#nav ul ul li:last-child > a {
        -moz-border-radius:0 0 10px 10px;
        -webkit-border-radius:0 0 10px 10px;
        border-radius:0 0 10px 10px;
}

#nav ul ul ul li:first-child > a {
        -moz-border-radius:0 10px 0 0;
        -webkit-border-radius:0 10px 0 0;
        border-radius:0 10px 0 0;
}

<div id="nav">
  <ul>
    <li><a href="/Website/Home">Home</a></li>
    <li><a>Goal</a>
        <ul>
            <li><a href="../Items/Create">New</a></li>
            <li><a href="/Items/List">Search/View</a></li>
        </ul>
    </li>
    <li><a>Opportunity</a>
        <ul>
            <li><a href="/Requirement/Create">New</a></li>
            <li><a href="/Requirement/List">Search/View</a></li>
        </ul>
    </li>
    <li><a>Alerts</a></li>
    <li><a>Reports</a></li>
    <li><a>Administration</a></li>
</ul>
  </div>

我很确定，但是如果将 :hover 更改为 :active 并且从 jquery 应用相同的操作，单击时是否会起作用。请指教。

Answer 1

首先，您的 CSS 可以改进很多。实现您的目标:

在下拉菜单中添加类，如下所示。

<ul class="dropdown">
    <li><a href="/Requirement/Create">New</a></li>
    <li><a href="/Requirement/List">Search/View</a></li>
</ul>

从 #nav li ul {..} 类中删除 left: -999em;。

添加以下 CSS。

#nav .dropdown { display: none; }
#nav .active .dropdown { display: block; }

以及以下 jQuery 代码。

$(function() {
    var $nav = $("#nav");
    var $items = $nav.find(" > ul > li");

    $items.on("click", function(evt) {
        evt.preventDefault();        
        var $current = $(this);
        var $toggle = $current.is(".active") ? 'removeClass' : 'addClass';
        $current.siblings().removeClass("active").end()[$toggle]("active");
    });
});

Here is a demo我创建了将以上所有内容放在一起。希望对您有所帮助。