菜单背后的渐变背景与悬停的透明背景

时间:2016-02-10 11:23:54

标签: javascript html css

以下是菜单的代码(jQuery,CSS,HTML):



$(window).resize(function() {
		// styling pro header
		var winW = $(window).width();
		var menuW = $('.fixedNav ul').width() + $('.fixedNav span').width() + 10;
		$('.fill').width(winW - menuW);

	});

	$(window).resize();

.blueLine {
  width: 100%;
  height: 0.2em;
  background-color: #00b0d6;
  background-image: -webkit-linear-gradient(left, #00b0d6 0%, #243892 100%);
  background-image: linear-gradient(to right,#00b0d6 0%, #243892 100%);
  position: fixed;
  z-index: 1000;
}

header {
  width: 100%;
  height: 5em;
  line-height: 5em;
  position: fixed;
  z-index: 999;
}
header > div {
  width: 100%;
  background-color: #FFF;
  height: 100%;
}

.fixedNav {
  height: 100%;
  background-color: #00b0d6;
  background-image: -webkit-linear-gradient(left, #00b0d6 0%, #243892 100%);
  background-image: linear-gradient(to right,#00b0d6 0%, #243892 100%);
}
.fixedNav::after {
  clear: both;
  content: "";
  display: table;
}
.fixedNav div:first-of-type {
  display: inline-block;
  height: 100%;
  position: absolute;
  background-color: #fff;
}
.fixedNav div:first-of-type a {
  display: inline-block;
  float: left;
  height: 100%;
  margin-left: 2em;
}
.fixedNav div:first-of-type a img {
  height: 60%;
  vertical-align: middle;
}
.fixedNav span:first-of-type {
  display: block;
  height: 100%;
  background-color: #FFF;
  float: right;
  width: 2em;
}
.fixedNav span:nth-of-type(2) {
  display: none;
}
.fixedNav ul {
  list-style: none;
  float: right;
  margin: 0;
  padding: 0;
  height: 100%;
  position: relative;
  display: block;
}
.fixedNav ul li {
  height: 100%;
  background-color: #FFF;
  display: inline-block;
  text-align: center;
}
.fixedNav ul li:hover {
  background-color: transparent;
}
.fixedNav ul li:hover a {
  color: #fff;
}
.fixedNav ul li a {
  display: block;
  width: 100%;
  height: 100%;
  color: #666666;
  text-decoration: none;
  font-family: "Open Sans", sans-serif;
  font-weight: 600;
  padding: 0 1em;
  box-sizing: border-box;
  font-size: 1.1em;
  letter-spacing: 1px;
}

.fill {
  float: right;
  background-color: #fff;
  height: 100%;
}

<div class="blueLine"></div>
<header>
	<div>
		<div class="fixedNav">
			<div><a href="#"><img src="" alt=""></a></div>
			<span></span>
			<span id="menuToggle"></span>
			<ul>
				<li><a href="#">MENUITEM</a></li><li>
					<a href="#">MENUITEM</a></li><li>
					<a href="#">MENUITEM</a></li>
			</ul>
			<div class="fill"></div>
		</div>
	</div>
</header>
&#13;
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this Fiddle中,您已经可以看到菜单所需的行为,其内容如下:

- 白色菜单后面是渐变背景


- 链接在悬停时获得透明背景,使渐变背景可见,此可见部分的颜色必须始终与上面的blueLine div的颜色相对应(具有相同的渐变背景)。

然而,上面的解决方案使用Javascript(计算调整大小时div.fill的宽度),这是不可取的,因为这会因为在css之后加载javascript而点击页面刷新。

我的问题是如何使用纯CSS来做同样的事情。

谢谢。

2 个答案:

答案 0 :(得分:1)

Flexbox可以使用伪元素而不是填充元素来实现。

我也已经消除了额外的包装div等。

header {
  width: 100%;
  height: 5em;
  line-height: 5em;
  position: fixed;
  z-index: 999;
}
.fixedNav {
  background-color: #00b0d6;
  background-image: -webkit-linear-gradient(left, #00b0d6 0%, #243892 100%);
  background-image: linear-gradient(to right, #00b0d6 0%, #243892 100%);
  padding-top: 4px; /* now the top 'border' */
}
.fixedNav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  height: 100%;
  position: relative;
  display: block;
  display: flex;
}
.fixedNav ul:before {
  content: '';
  flex: 1;
  background: white; /* filler element */
}
.fixedNav ul li {
  height: 100%;
  background-color: #FFF;
  text-align: center;
}
.fixedNav ul li:hover {
  background-color: transparent;
}
.fixedNav ul li:hover a {
  color: #fff;
}
.fixedNav ul li a {
  display: block;
  width: 100%;
  height: 100%;
  color: #666666;
  text-decoration: none;
  font-family: "Open Sans", sans-serif;
  font-weight: 600;
  padding: 0 1em;
  box-sizing: border-box;
  font-size: 1.1em;
  letter-spacing: 1px;
}
<header>
  <div class="fixedNav">
    <ul>
      <li><a href="#">MENUITEM</a>
      </li>
      <li><a href="#">MENUITEM</a>
      </li>
      <li><a href="#">MENUITEM</a>
      </li>
    </ul>
  </div>
</header>

答案 1 :(得分:1)

SAMPLE FIDDLE

我稍微重写了一下你的代码,因为我觉得这个效果可以在纯CSS中更轻松,更清晰。

header {
  width: 100%;
  height: 75px;  
  padding-top:5px;
  position: fixed;
  z-index: 999;
  display: table;
  background-color: #00b0d6;
  background-image: -webkit-linear-gradient(left, #00b0d6 0%, #243892 100%);
  background-image: linear-gradient(to right, #00b0d6 0%, #243892 100%);
}
.fixedNav {
  height: 100%;
  width: 100%;
  display: table-row;
  overflow: hidden;
}
.fixedNav li {
  background: #fff;
  list-style: none;
  display: table-cell;
  height: 100%;
  vertical-align:top;
}
.fixedNav li.menuBtn {
  width: 20px;
}
.fixedNav li.btn {
  width: 50px;
}
.fixedNav li.btn:hover,
.fixedNav li.menuBtn:hover {
  background: none;
}
.fixedNav a {
  display: block;
  width: 100%;
  height: 100%;
  color: #666;
  text-decoration: none;
  font: 600 1.1em/75px "Open Sans", sans-serif;
  box-sizing: border-box;
  padding: 0 1em;
  letter-spacing: 1px;
}
.fixedNav a:hover {
  color: #fff;
}
<header>
  <ul class="fixedNav">
    <li class="menuBtn">
      <a href="#menuToggle">*</a>
    </li>
    <li><a href="#"></a></li>
    <li class="btn"><a href="#">MENUITEM</a></li>
    <li class="btn"><a href="#">MENUITEM</a></li>
    <li class="btn"><a href="#">MENUITEM</a></li>
  </ul>
</header>