Question

如何更改用户选择的活动菜单/子菜单的样式？当我单击子菜单时，我希望该子菜单及其父菜单具有不同的样式（如悬停，但永久）。

/*jQuery time*/
$(document).ready(function(){
	$("#accordian h3").click(function(){
		//slide up all the link lists
		$("#accordian ul ul").slideUp();
		//slide down the link list below the h3 clicked - only if its closed
		if(!$(this).next().is(":visible"))
		{
			$(this).next().slideDown();
		}
	})
})

/*custom font for text*/
@import url(http://fonts.googleapis.com/css?family=Nunito);
/*CSS file for fontawesome - an iconfont we will be using. This CSS file imported contains the font-face declaration. More info: http://fortawesome.github.io/Font-Awesome/ */
@import url(http://thecodeplayer.com/uploads/fonts/fontawesome/css/font-awesome.min.css);

/*Basic reset*/
* {margin: 0; padding: 0;}

body {
	background: #4EB889;
	font-family: Nunito, arial, verdana;
}
#accordian {
	background: #004050;
	width: 250px;
	margin: 100px auto 0 auto;
	color: white;
	/*Some cool shadow and glow effect*/
	box-shadow: 
		0 5px 15px 1px rgba(0, 0, 0, 0.6), 
		0 0 200px 1px rgba(255, 255, 255, 0.5);
}
/*heading styles*/
#accordian h3 {
	font-size: 12px;
	line-height: 34px;
	padding: 0 10px;
	cursor: pointer;
	/*fallback for browsers not supporting gradients*/
	background: #003040; 
	background: linear-gradient(#003040, #002535);
}
/*heading hover effect*/
#accordian h3:hover {
	text-shadow: 0 0 1px rgba(255, 255, 255, 0.7);
}
/*iconfont styles*/
#accordian h3 span {
	font-size: 16px;
	margin-right: 10px;
}
/*list items*/
#accordian li {
	list-style-type: none;
}
/*links*/
#accordian ul ul li a {
	color: white;
	text-decoration: none;
	font-size: 11px;
	line-height: 27px;
	display: block;
	padding: 0 15px;
	/*transition for smooth hover animation*/
	transition: all 0.15s;
}
/*hover effect on links*/
#accordian ul ul li a:hover {
	background: #003545;
	border-left: 5px solid lightgreen;
}
/*Lets hide the non active LIs by default*/
#accordian ul ul {
	display: none;
}
#accordian li.active ul {
	display: block;
}

<script src="http://thecodeplayer.com/uploads/js/jquery-1.7.1.min.js"></script>
<script src="http://thecodeplayer.com/uploads/js/prefixfree-1.0.7.js"></script>
<div id="accordian">
	<ul>
		<li>
			<h3><span class="icon-dashboard"></span>Dashboard</h3>
			<ul>
				<li><a href="#">Reports</a></li>
				<li><a href="#">Search</a></li>
				<li><a href="#">Graphs</a></li>
				<li><a href="#">Settings</a></li>
			</ul>
		</li>
		<!-- we will keep this LI open by default -->
		<li class="active">
			<h3><span class="icon-tasks"></span>Tasks</h3>
			<ul>
				<li><a href="#">Today's tasks</a></li>
				<li><a href="#">Urgent</a></li>
				<li><a href="#">Overdues</a></li>
				<li><a href="#">Recurring</a></li>
				<li><a href="#">Settings</a></li>
			</ul>
		</li>
		<li>
			<h3><span class="icon-calendar"></span>Calendar</h3>
			<ul>
				<li><a href="#">Current Month</a></li>
				<li><a href="#">Current Week</a></li>
				<li><a href="#">Previous Month</a></li>
				<li><a href="#">Previous Week</a></li>
				<li><a href="#">Next Month</a></li>
				<li><a href="#">Next Week</a></li>
				<li><a href="#">Team Calendar</a></li>
				<li><a href="#">Private Calendar</a></li>
				<li><a href="#">Settings</a></li>
			</ul>
		</li>
		<li>
			<h3><span class="icon-heart"></span>Favourites</h3>
			<ul>
				<li><a href="#">Global favs</a></li>
				<li><a href="#">My favs</a></li>
				<li><a href="#">Team favs</a></li>
				<li><a href="#">Settings</a></li>
			</ul>
		</li>
	</ul>
</div>

Here是一个JSFiddle。

Answer 1

只需添加此javascript代码：

$("#accordian h3").click(function(){
      $('.active').removeClass('active');
      $(this).addClass('active');
});
$('#accordian li a').click(function(){
     $('.submenu-active').removeClass('submenu-active');
     $(this).addClass('submenu-active');
});

和这个CSS：

.active{
    text-shadow: 0 0 1px rgba(255, 255, 255, 0.7);
    color: red; /* NOTE i INTENTIONALLY ADDED RED COLOR TO ILLUSTRATE BETTER */
}
.submenu-active{
    background: #003545;
    border-left: 5px solid lightgreen;
}

试试这个DEMO

说明：

单击菜单项时，要从先前活动的项目中删除.active类，并将其设置为单击的项目。这同样适用于我添加.submenu-active类而不是.active

的子菜单项

Answer 2

您可以将.selected类添加到CSS文件中：

.selected {
    background-color: <your_color>;
}

在您的Javascript文件中：

$('#accordian li  ul  li').click(function(){
    $('#accordian li  ul  li').removeClass('selected');
    $(this).addClass('selected');
});

Answer 3

创建一个具有所需样式的css类。在li中添加一些类（例如class="li_to_click"。然后使用以下代码：

$('.li_to_click').click(function() {
    $(this).toggleClass('class_with_style');
    $(this).parent().toggleClass('class_with_style');
});

您可能希望根据需要更改代码。

如何在点击时更改菜单的样式？

3 个答案: