我正在使用Bootstrap 4过渡我的旧网站,所以它绝对是一个学习过程。
我的网站布局工作正常,但我发现我的左侧垂直导航栏有很多链接。其中许多分组在倒塌的巢穴中。
我认为在我的导航栏顶部添加搜索栏会很好,这样我就可以根据在搜索栏中输入的部分字符串来过滤链接。这适用于未隐藏在隐藏div(或class=collapsed
boostrap 4 ul)内的链接。
我非常感谢您协助修改我的代码,以显示包含隐藏在折叠的ul内的所有链接的过滤结果?
$('.search-filter').on('keyup', function() {
var input = $('.search-filter').val();
var filter = input.toLowerCase();
if (filter.length == 0) { // show all if filter is empty
$('a').each(function() {
$(this).show(); // show links
});
return;
} else {
$('a').removeClass('collapsed');
$('a').each(function() {
$(this).hide(); // hide all links once search is begun
});
$('a:contains("' + filter + '")').each(function() {
$(this).removeClass('collapsed'); // remove bootstrap 4 collapsed class designation
$(this).show(); // show only matched links to search string?
});
}
});

@import url('https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css');
.navbar-nav.sidebar-nav {
position: absolute;
left: 0;
top: 0;
margin-top: 56px;
padding-bottom: 56px;
height: 100vh;
background: #292b2c;
-webkit-flex-direction: column;
-ms-flex-direction: column;
flex-direction: column;
overflow: auto;
}
.navbar-brand {
display: inline-block;
padding-top: .25rem;
padding-bottom: .25rem;
margin-right: 1rem;
font-size: 1.25rem;
line-height: inherit;
white-space: nowrap;
color: #fff;
}
.navbar-nav .nav-link {
color: rgba(255, 255, 255, .5);
}

<div id="link-content">
<ul class="sidebar-nav navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#"><i class="fa fa-fw fa-home"></i> Home</a>
</li>
<li class="nav-item">
<label for="nav-search" class="col-2 col-form-label sr-only">Search links</label>
<div class="col p-2">
<input class="form-control form-control-sm search-filter" type="search" id="nav-search" placeholder="Search for tools">
</div>
</li>
<li class="nav-item">
<span class="navbar-brand">Popular tools</span>
</li>
<li class="nav-item">
<a class="nav-link" href="#"><i class="fa fa-fw fa-calculator"></i> Calculator</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#"><i class="fa fa-fw fa-battery-3"></i> Battery </a>
</li>
<li class="nav-item">
<a class="nav-link" href="#"><i class="fa fa-fw fa-database"></i> Pancake Batter</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#"><i class="fa fa-fw fa-clock-o"></i> Marzipan</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#"><i class="fa fa-fw fa-tags"></i> Cakes and Muffins</a>
</li>
<li class="nav-item">
<span class="navbar-brand">Categories</span>
</li>
<li class="nav-item">
<a class="nav-link nav-link-collapse collapsed" data-toggle="collapse" href="#collapseComponents"><i class="fa fa-fw fa-flask"></i> Cars</a>
<ul class="sidebar-second-level collapse" id="collapseComponents">
<li>
<a class="nav-link-collapse collapsed" data-toggle="collapse" href="#collapseMulti2">American</a>
<ul class="sidebar-third-level collapse" id="collapseMulti2">
<li>
<a href="#">Ford</a>
</li>
<li>
<a href="#">GMC</a>
</li>
</ul>
</li>
<li>
<a class="nav-link-collapse collapsed" data-toggle="collapse" href="#collapseMulti3">European</a>
<ul class="sidebar-third-level collapse" id="collapseMulti3">
<li>
<a href="#">BMW</a>
</li>
<li>
<a href="#">Audi</a>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js"></script>
&#13;
答案 0 :(得分:8)
好吧,我想我已经自己想出来了(在这篇文章的帮助下,对一个不区分大小写的filter)。
1)我通过将链接包装在div with id #link-content
中来更新链接,以将我的过滤器与主页和搜索输入分开。
2)我添加了上面引用的不区分大小写的方法
我的HTML:
<ul class="sidebar-nav navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#"><i class="fa fa-fw fa-home"></i> Home</a>
</li>
<li class="nav-item">
<label for="nav-search" class="col-2 col-form-label sr-only">Search links</label>
<div class="col p-2">
<input class="form-control form-control-sm search-filter" type="search" id="nav-search" placeholder="Search for tools">
</div>
</li>
<div id="link-content"><!-- added this to wrap the links-->
<li class="nav-item">
<span class="navbar-brand">Popular tools</span>
</li>
<li class="nav-item filter">
<a class="nav-link" href="#"><i class="fa fa-fw fa-calculator"></i> Calculator</a>
</li>
<li class="nav-item filter">
<a class="nav-link" href="#"><i class="fa fa-fw fa-battery-3"></i> Battery </a>
</li>
<li class="nav-item filter">
<a class="nav-link" href="#"><i class="fa fa-fw fa-database"></i> Pancake Batter</a>
</li>
<li class="nav-item filter">
<a class="nav-link" href="#"><i class="fa fa-fw fa-clock-o"></i> Marzipan</a>
</li>
<li class="nav-item filter">
<a class="nav-link" href="#"><i class="fa fa-fw fa-tags"></i> Cakes and Muffins</a>
</li>
<li class="nav-item filter">
<span class="navbar-brand">Categories</span>
</li>
<li class="nav-item ">
<a class="nav-link nav-link-collapse collapsed" data-toggle="collapse" href="#collapseComponents"><i class="fa fa-fw fa-flask"></i> Cars</a>
<ul class="sidebar-second-level collapse" id="collapseComponents">
<li>
<a class="nav-link-collapse collapsed" data-toggle="collapse" href="#collapseMulti2">American</a>
<ul class="sidebar-third-level collapse" id="collapseMulti2">
<li>
<a href="#">Ford</a>
</li>
<li>
<a href="#">GMC</a>
</li>
</ul>
</li>
<li>
<a class="nav-link-collapse collapsed" data-toggle="collapse" href="#collapseMulti3">European</a>
<ul class="sidebar-third-level collapse" id="collapseMulti3">
<li>
<a href="#">BMW</a>
</li>
<li>
<a href="#">Audi</a>
</li>
</ul>
</li>
</ul>
</li>
</div>
</ul>
我的更新代码:
// Case insensitive method for filter
jQuery.expr[':'].casecontains = (a, b, c) => jQuery(a).text().toUpperCase().indexOf(c[3].toUpperCase()) >= 0;
$('.search-filter').on('keyup', function () {
var input = $('.search-filter').val();
console.log('input: '+input);
if (input.length != 0) {
// first hide the div #link-content lists from view
$('#link-content li').hide();
// but secretly unhide the collapsed links
// using .show, so the nested uls can be viewed
$('#link-content li.nav-item ul').show();
// then filter in the matching links only
$('#link-content li:casecontains("'+input+'")').show();
} else {
// secretly unhide the collapsed links
$('#link-content li.nav-item ul').hide();
// if search is empty, show the div and reset columns
$('#link-content li').show();
}
});
这是一个fiddle,其中包含打开任何隐藏链接的工作示例(在boost 4中折叠了类)。
答案 1 :(得分:7)
我使用的方法是记住哪些项匹配,然后使用该列表取消隐藏父母。
更新小提琴:https://jsfiddle.net/j2gpann3/1/
这种方法的优势在于,隐藏的子菜单项(如&#39; BMW&#39;等)现在将出现在搜索中,并且不会在其他项目之上留下巨大的空白隐藏的物品。正则表达式搜索会搜索每个单词的出现次数,因此即使它们与菜单项文本无关,它仍然会匹配。
$('.search-filter').on('keyup', function() {
var matches = [];
var input = $.trim($('.search-filter').val());
var val = '^(?=.*\\b' + input.split(/\s+/).join('\\b)(?=.*\\b') + ').*$'; // using individual word matching filter from http://stackoverflow.com/a/9127872/1544886
var filter = RegExp(val, 'i');
if (input.length === 0) { // show all if filter is empty
$('.collapse').removeClass('show').addClass('collapsed'); // hide collapsable items fast.
$('.hide').removeClass('hide'); // remove any hidden elements from previous searches
} else {
$('.collapse').addClass('show'); // show all collapsed items
$('ul.sidebar-nav a:not(".home")').filter(function() { // skip home <li> so it shows permanently
$this = $(this);
// test for a match to search string
text = $this.text().replace(/\s+/g, ' ');
var isMatch = filter.test(text);
// store match so we can unhide parents of this item
if (isMatch) matches.push($this);
return !isMatch;
}).parent().addClass('hide'); // this hides any <li> that doesn't match search terms. Hiding <a> results in large gaps in the output
$.each(matches, function() { // unhide parents of our matches
this.parentsUntil(".sidebar-nav", ".hide").removeClass('hide');
});
}
});
该演示需要在Home链接中添加home
类,以防止它被搜索隐藏:
<a class="nav-link home" href="#"><i class="fa fa-fw fa-home"></i> Home</a>
添加了hide
的CSS类:
.hide {
display: none;
}
答案 2 :(得分:1)
如果删除:
toLowerCase();
如果您完美输入,一切都完美匹配。问题是您将搜索字词设为小写,但它与小写字词不匹配。因此,当您键入计算器时,它不匹配,因为实际导航项显示为计算器,具有大写c。
因此,您也可以通过HTML或JavaScript将导航项设置为小写,或者以不同的方式进行操作,即使用ID,但如果网站是动态的,则会导致问题。
一些奇怪的工作可能是将每个单词的首字母大写,以便它实际上与HTML匹配。看看How to capitalize first letter of each word, like a 2-word city?