引导程序3-禁用导航栏崩溃

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The nabvar will collapse on small devices. The point of collapsing is defined by @grid-float-breakpoint in variables. By default this will by before 768px. For screens below the 768 pixels screen width, the navbar will look like:

enter image description here

It's possible to change the @grid-float-breakpoint in variables.less and recompile Bootstrap. When doing this you also will have to change @screen-xs-max in navbar.less. You will have to set this value to your new @grid-float-breakpoint -1. See also: https://github.com/twbs/bootstrap/pull/10465. This is needed to change navbar forms and dropdowns at the @grid-float-breakpoint to their mobile version too.

Easiest way is to customize bootstrap

find variable:

 @grid-float-breakpoint

which is set to @screen-sm, you can change it according to your needs. Hope it helps!

For SAAS Users

add your custom variables like $grid-float-breakpoint: 0px; before the @import "bootstrap.scss";

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最佳答案

After close examining, not 300k lines but there are around 3-4 CSS properties that you need to override:

.navbar-collapse.collapse {
display: block!important;
}


.navbar-nav>li, .navbar-nav {
float: left !important;
}


.navbar-nav.navbar-right:last-child {
margin-right: -15px !important;
}


.navbar-right {
float: right!important;
}

And with this your menu won't collapse.

DEMO (jsfiddle)

EXPLANATION

The four CSS properties do the respective:

The default .collapse property in bootstrap hides the right-side of the menu for tablets(landscape) and phones and instead a toggle button is displayed to hide/show it. Thus this property overrides the default and persistently shows those elements.
For the right-side menu to appear on the same line along with the left-side, we need the left-side to be floating left.
This property is present by default in bootstrap but not on tablet(portrait) to phone resolution. You can skip this one, it's likely to not affect your overall navbar.
This keeps the right-side menu to the right while the inner elements (li) will follow the property 2. So we have left-side float left and right-side float right which brings them into one line.

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Here's an approach that leaves the default collapse behavior unchanged while allowing a new section of navigation to always remain visible. Its an augmentation of navbar; navbar-header-menu is a CSS class I have created and is not part of Bootstrap proper.

Place this in the navbar-header element after navbar-brand:

<div class="navbar-header-menu">
<ul class="nav navbar-nav">
<li class="active"><a href="#">I'm always visible</a></li>
</ul>
<form class="navbar-form" role="search">
<div class="form-group">
<input type="text" class="form-control" placeholder="Search">
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
</div>

Add this CSS:

.navbar-header-menu {
float: left;
}


.navbar-header-menu > .navbar-nav {
float: left;
margin: 0;
}


.navbar-header-menu > .navbar-nav > li {
float: left;
}


.navbar-header-menu > .navbar-nav > li > a {
padding-top: 15px;
padding-bottom: 15px;
}


.navbar-header-menu > .navbar-nav .open .dropdown-menu {
position: absolute;
float: left;
width: auto;
margin-top: 0;
background-color: #fff;
border: 1px solid #ccc;
border: 1px solid rgba(0,0,0,.15);
-webkit-box-shadow: 0 6px 12px rgba(0,0,0,.175);
box-shadow: 0 6px 12px rgba(0,0,0,.175);
}


.navbar-header-menu > .navbar-form {
float: left;
width: auto;
padding-top: 0;
padding-bottom: 0;
margin-right: 0;
margin-left: 0;
border: 0;
-webkit-box-shadow: none;
box-shadow: none;
}


.navbar-header-menu > .navbar-form > .form-group {
display: inline-block;
margin-bottom: 0;
vertical-align: middle;
}


.navbar-header-menu > .navbar-left {
float: left;
}


.navbar-header-menu > .navbar-right {
float: right !important;
}


.navbar-header-menu > *.navbar-right:last-child {
margin-right: -15px !important;
}

Check the fiddle: http://jsfiddle.net/L2txunqo/

Caveat: navbar-right can be used to sort elements visually but is not guaranteed to pull the element to the furthest right portion of the screen. The fiddle demonstrates that behavior with the navbar-form.

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If you're not using the less version, here is the line you need to change:

@media (max-width: 767px) { /* Change this to 0 */
.navbar-nav .open .dropdown-menu {
position: static;
float: none;
width: auto;
margin-top: 0;
background-color: transparent;
border: 0;
box-shadow: none;
}
.navbar-nav .open .dropdown-menu > li > a,
.navbar-nav .open .dropdown-menu .dropdown-header {
padding: 5px 15px 5px 25px;
}
.navbar-nav .open .dropdown-menu > li > a {
line-height: 20px;
}
.navbar-nav .open .dropdown-menu > li > a:hover,
.navbar-nav .open .dropdown-menu > li > a:focus {
background-image: none;
}
}

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The following solution worked for me in Bootstrap 3.3.4:

CSS:

/*no collapse*/


.navbar-collapse.collapse.off {
display: block!important;
}
.navbar-collapse.collapse.off ul {
margin: 0;
padding: 0;
}


.navbar-nav.no-collapse>li,
.navbar-nav.no-collapse {
float: left !important;
}


.navbar-right.no-collapse {
float: right!important;
}

then add the .no-collapse class to each of the lists and the .off class to the main container. Here is an example written in jade:

nav.navbar.navbar-default.navbar-fixed-top
.container-fluid
.collapse.navbar-collapse.off
ul.nav.navbar-nav.no-collapse
li
a(href='#' class='glyph')
i(class='glyphicon glyphicon-info-sign')
ul.nav.navbar-nav.navbar-right.no-collapse
li.dropdown
a.dropdown-toggle(href='#', data-toggle='dropdown' role='button' aria-expanded='false')
| Tools
span.caret
ul.dropdown-menu(role='menu')
li
a(href='#') Tool #1
li
a(href='#')
| Logout

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Another way is to simply remove collapse navbar-collapse from the markup. Example with Bootstrap 3.3.7

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">


<nav class="navbar navbar-atp">
<div class="container-fluid">
<div class="">
<ul class="nav navbar-nav nav-custom">
<li>
<a href="#" id="sidebar-btn"><span class="fa fa-bars">Toggle btn</span></a>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li>Nav item</li>
</ul>
</div>
</div>
</nav>