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[英]Bootstrap 3 Fixed Top Navbar 'Flickering' On Mobile Scrolling using jQuery One-Page Scrolling Effect
[英]jQuery: change text color of a fixed top navbar at the scrolling of the page
我的个人网站需要帮助。 我想制作一个带有固定顶部导航栏(透明背景)的单页网站。 在页面的滚动中,菜单元素的颜色必须在具有深色背景的部分(它们具有“.dark-bg”类)上从黑色变为白色,并且在其他部分上返回白色。 所有部分都是100vh高度(当然除了菜单)。 这是网站的HTML主要结构:
<section class="section--menu fixed-header">
<nav class="menu" id="navigation">
<ul class="menu__list pull-md-right">
<li class="menu__item menu__item--current">
<a class="menu__link" data-target="intro-fabio">home</a>
</li>
<li class="menu__item">
<a class="menu__link" data-target="about-fabio">about</a>
</li>
<li class="menu__item">
<a class="menu__link" data-target="skills-fabio">skills</a>
</li>
<li class="menu__item">
<a class="menu__link" data-target="works-fabio">works</a>
</li>
<li class="menu__item">
<a class="menu__link" data-target="contacts-fabio">contacts</a>
</li>
</ul>
</nav>
</section>
<!-- HOME
======================================================== -->
<section id="intro-fabio">
</section>
<!-- ABOUT
======================================================== -->
<section id="about-fabio" class="dark-bg">
</section>
<!-- SKILLS
======================================================== -->
<section id="skills-fabio">
</section>
<!-- WORKS
======================================================== -->
<section id="works-fabio" class="dark-bg">
</section>
<!-- CONTACTS
======================================================== -->
<section id="contacts-fabio">
</section>
我写了这个jQuery脚本,但似乎只适用于带有“.dark-bg”类的最后一节。
$(document).ready(function() {
$(".dark-bg").each(function() {
detectBg( $(this) );
});
function detectBg(sezione) {
$(window).scroll(function() {
var finestra = $(window).scrollTop();
var sezCurr = sezione.offset().top;
var sezNext = sezione.next().offset().top;
if (finestra >= sezCurr && finestra < sezNext) {
$('.menu__link').css("color", "#ebebeb");
}
else {
$('.menu__link').css("color", "#1c1c1c");
}
});
}
});
提前致谢!
您需要处理窗口的滚动事件,并在该处理程序中检查菜单下是否有任何暗部分,如果是,则更改菜单链接的颜色。 以下是更改所有链接颜色的示例,但可以轻松扩展为每个链接单独执行此操作:
$(window).scroll(function() { var vpHeight = $(window).height(); var isBlack = false; $(".dark-bg").each(function(i, section) { if(isBlack) { return; } var offset = $(section).offset().top - $(window).scrollTop(); if(((offset + vpHeight) >= 0) && ((offset + vpHeight) <= vpHeight)) { isBlack = true; return; } }); $(".menu__link").css("color", isBlack ? "white" : "black"); });
body { padding: 0; margin: 0; } ul { position:fixed; background: orange; padding: 0; margin: 0; list-style-type: none; } ul > li { float: left; padding: 0 4px; } section { background:red; height: 100vh; } .dark-bg { background: black; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <ul class="menu__list pull-md-right"> <li class="menu__item menu__item--current"> <a class="menu__link" data-target="intro-fabio">home</a> </li> <li class="menu__item"> <a class="menu__link" data-target="about-fabio">about</a> </li> <li class="menu__item"> <a class="menu__link" data-target="skills-fabio">skills</a> </li> <li class="menu__item"> <a class="menu__link" data-target="works-fabio">works</a> </li> <li class="menu__item"> <a class="menu__link" data-target="contacts-fabio">contacts</a> </li> </ul> <!-- HOME ======================================================== --> <section id="intro-fabio"> </section> <!-- ABOUT ======================================================== --> <section id="about-fabio" class="dark-bg"> </section> <!-- SKILLS ======================================================== --> <section id="skills-fabio"> </section> <!-- WORKS ======================================================== --> <section id="works-fabio" class="dark-bg"> </section> <!-- CONTACTS ======================================================== --> <section id="contacts-fabio"> </section>
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