How to change navbar collapse threshold using Twit

Question

I'm using Twitter Bootstrap 2.0.1 in a Rails 3.1.2 project, implemented with bootstrap-sass. I'm loading both the bootstrap.css and the bootstrap-responsive.css files, as well as the bootstrap-collapse.js Javascript.

I have a fluid layout with a navbar similar to the example. This follows the navbar "responsive variation" instructions here. It works fine: if the page is narrower than about 940px, the navbar collapses and displays a "button" that I can click on to expand.

However my navbar looks good down to about 550px wide, i.e. it doesn't need to be collapsed unless the screen is very narrow.

How do I tell Bootstrap to only collapse the navbar if the screen is less than 550px wide?

Note that at this point I do not want to modify the other responsive behaviors, e.g. stacking elements instead of displaying them side by side.

Answer 1

Bootstrap 3.x

using LESS, you can change the value of @screen-small to target your min size

example: @screen-small: 600px;

i use this to only switch to "tiny device" mode once the width is less than 600px

Answer 2

This is a great example of where you could be using the LESS version of the Bootstrap CSS files. How to do this is below.

Even better would be to submit this as a pull request on Github so that everyone can benefit and your "custom code" would hopefully be part of Bootstrap moving forward.

• Add a variable to variables.less that specifies when to collapse the navbar. Something like: @navCollapseWidth: 979px
• Then modify responsive-navbar.less...
  • Up top change @media (max-width: 979px) to @media (max-width: @navCollapseWidth)
  • At the bottom change @media (min-width: 980px) to @media (max-width: @navCollapseWidth - 1)

Of course... you'd have to compile LESS using one of the suggested methods.

Answer 3

Taking tyler's hack even further by adding a visible-phone classed block and a hidden-phone class to an item in the main collapsible navigation, you can 'pull out' one or two of the collapsed items to display even in the phone navbar.

<div class="navbar navbar-fixed-top">
  <div class="navbar-inner">
    <div class="container-fluid">
      <a href="<%= root_url %>" class="brand brandtag"></a>
      <a class="btn btn-navbar visible-phone" data-toggle="collapse" data-target=".nav-collapse">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </a>
      <div class="visible-tablet">
        <ul class="nav">
          <li>Navigation 1</li>
          <li>Navigation 2</li>
          <li>Navigation 3</li>
        </ul>
      </div>
      <div class="visible-phone">
        <ul class="nav">
          <li>Navigation 1</li>
        </ul>
      </div>
      <div class="nav-collapse">
        <ul class="nav">
          <li class="hidden-phone">Navigation 1</li>
          <li>Navigation 2</li>
          <li>Navigation 3</li>
        </ul>
      </div>
    </div>
  </div>
</div>

Answer 4

I suspect (and hope) this will be implemented in an official way soon. In the meantime I'm just doing a simple css hack, using visible-phone on the dropdown button and visible-tablet on a second set of buttons I've placed in the navbar. So before it looked like this:

<div class="navbar navbar-fixed-top">
  <div class="navbar-inner">
    <div class="container-fluid">
      <a href="<%= root_url %>" class="brand brandtag"></a>
      <a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </a>
      <div class="nav-collapse">
        <ul class="nav">
          <li>Navigation 1</li>
          <li>Navigation 2</li>
          <li>Navigation 3</li>
        </ul>
      </div>
    </div>
  </div>
</div>

And now it looks like:

<div class="navbar navbar-fixed-top">
  <div class="navbar-inner">
    <div class="container-fluid">
      <a href="<%= root_url %>" class="brand brandtag"></a>
      <a class="btn btn-navbar visible-phone" data-toggle="collapse" data-target=".nav-collapse">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </a>
      <div class="visible-tablet">
        <ul class="nav">
          <li>Navigation 1</li>
          <li>Navigation 2</li>
          <li>Navigation 3</li>
        </ul>
      </div>
      <div class="nav-collapse">
        <ul class="nav">
          <li>Navigation 1</li>
          <li>Navigation 2</li>
          <li>Navigation 3</li>
        </ul>
      </div>
    </div>
  </div>
</div>

Note that order of elements is important, otherwise you may have issues with elements going into the next line

Answer 5

You can establish a new @media query to drop the navbar elements down as you see fit, all you have to do is reset the former to accommodate your new query with the desired drop width. Take this for example:

CSS

/** Modified Responsive CSS **/

@media (max-width: 979px) {
    .btn-navbar {
        display: none;
    }
    .navbar .nav-collapse {
        clear: none;
    }

    .nav-collapse {
        height: auto;
        overflow: auto;
    }

    .navbar .nav {
        float: left;
        margin: 0 10px 0 0;
    }

    .navbar .brand {
        margin-left: -20px;
        padding: 8px 20px 12px;
    }

    .navbar .dropdown-menu:before, .navbar .dropdown-menu:after {
        display: block;
    }

    .navbar .nav > li > a, .navbar .dropdown-menu a {
        border-radius: 0;
        color: #999999;
        font-weight: normal;
        padding: 10px 10px 11px;
    }

    .navbar .nav > li {
        float: left;
    }

    .navbar .dropdown-menu {
        background-clip: padding-box;
        background-color: #FFFFFF;
        border-color: rgba(0, 0, 0, 0.2);
        border-radius: 0 0 5px 5px;
        border-style: solid;
        border-width: 1px;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
        display: none;
        float: left;
        left: 0;
        list-style: none outside none;
        margin: 0;
        min-width: 160px;
        padding: 4px 0;
        position: absolute;
        top: 100%;
        z-index: 1000;
    }

    .navbar-form, .navbar-search {
        border:none;
        box-shadow: 0 1px 0 rgba(255, 255, 255, 0.1) inset, 0 1px 0 rgba(255, 255, 255, 0.1);
        float: left;
        margin-bottom: 0;
        margin-top:6px;
        padding: 9px 15px;
    }

    .navbar .nav.pull-right {
        float: right;
        margin-left: auto;
    }
}

@media (max-width: 550px) {
    .btn-navbar {
        display: block;
    }
    .navbar .nav-collapse {
        clear: left;
    }

    .nav-collapse {
        height: 0;
        overflow: hidden;
    }

    .navbar .nav {
        float: none;
        margin: 0 0 9px;
    }

    .navbar .brand {
        margin: 0 0 0 -5px;
        padding-left: 10px;
        padding-right: 10px;
    }

    .navbar .dropdown-menu:before, .navbar .dropdown-menu:after {
        display: none;
    }

    .navbar .nav > li > a, .navbar .dropdown-menu a {
        border-radius: 3px 3px 3px 3px;
        color: #999999;
        font-weight: bold;
        padding: 6px 15px;
    }

    .navbar .nav > li {
        float: none;
    }

    .navbar .dropdown-menu {
        background-color: transparent;
        border: medium none;
        border-radius: 0 0 0 0;
        box-shadow: none;
        display: block;
        float: none;
        left: auto;
        margin: 0 15px;
        max-width: none;
        padding: 0;
        position: static;
        top: auto;
    }

    .navbar-form, .navbar-search {
        border-bottom: 1px solid #222222;
        border-top: 1px solid #222222;
        box-shadow: 0 1px 0 rgba(255, 255, 255, 0.1) inset, 0 1px 0 rgba(255, 255, 255, 0.1);
        float: none;
        margin: 9px 0;
        padding: 9px 15px;
    }

    .navbar .nav.pull-right {
        float: none;
        margin-left: 0;
    }

}

In the following code you can see how I included the original @media query that handles the drop before the 979px mark and the new query to support your desired drop point of 550px. I modified the original query straight from the bootstrap-responsive css to reset all the styles applied to that specific query for the navbar elements and ported them to the new query that carries the drop point you need instead. This way we can commute all the styles from the original query down to the new query without messing around in the bootstrap-responsive stylesheet, this way the default values will still apply to the other elements in your document.

Here is a short demo with a media query set to drop at 550px as you require: http://jsfiddle.net/wU8MW/

Note: I placed the above modified @media queries way down below the css frame as the new modified css is supposed to be loaded first than the responsive css.

Answer 6

Here is my code (All other solution showed funky scrollbar as the navbar dropped down so I edited the code so it didn't). I could not post on other answer so I'll do it here for others to find. I am using rails to do this with Bootstrap 3.0.

assets/stylesheets/framework and overrides paste this: (Adjust max width to whatever value to achieve your goal.)

@media (max-width: 2500px) {
.navbar-header {
    float: none;
}
.navbar-toggle {
    display: block;
}
.navbar-collapse {
    border-top: 1px solid transparent;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.1);
}
.navbar-collapse.collapse {
    display: none!important;
}
.navbar-collapse.collapse.in {
    display: block!important;
}
.navbar-nav {
    float: none!important;
}
.navbar-nav>li {
    float: none;
}
.navbar-nav>li>a {
    padding-top: 10px;
    padding-bottom: 10px;
}