Turning off Twitter Bootstrap Navbar Transition animation

问题

Just like http://twitter.github.com/bootstrap,

The site what I working on now is responsive.

I would like to remove transition animation

when I click the collapsed navbar menu button.

Above picture is the screenshot of what I'm asking.

At TOP-RIGHT-CORNER, there is a three-lined menu button.

回答1:

Bootstrap accomplishes the transition animation of the responsive nav bar the same way it does any collapse, which is using a CSS3 transition. To turn off the transition for only the navbar (leaving any other transitions in place), you simply have to override the CSS.

I'd suggest adding a class, such as no-transition (but the name can be arbitrary) to your collapsible container

<div class="nav-collapse no-transition">

and then defining a CSS rule that will disable the CSS3 transition that Bootstrap defined (make sure your CSS rule is parsed after bootstrap.css):

.no-transition {
  -webkit-transition: height 0;
  -moz-transition: height 0;
  -ms-transition: height 0;
  -o-transition: height 0;
  transition: height 0;
}

But, don't stop there! Bootstrap's JavaScript is hard-coded to assume that a transition WILL take place if transitions are supported by the browser. If you just make the change above, you'll find that the collapsible object "locks" after one open/close cycle, because it is still waiting for the browser's transition end event to fire. There are two less-than-ideal ways to work around this:

First option: hack bootstrap-collapse.js to not wait for the transition end event. Messing with Bootstrap is never a great idea because it'll make future updates a pain for you. This particular work-around would also need to be similarly applied to any other Bootstrap JavaScript component onto which you wish to impart the no-transition class.

bootstrap-collapse.js:107

      this.$element.hasClass('no-transition') || (this.transitioning = 1);

Second, recommended, option: use an ultra-short transition time instead of disabling the transition. This doesn't quite remove the transition animation as you asked, but it accomplishes a similar result with likely no noticable negative impact on the performance of your low-powered mobile devices. The upside of this method is that you don't have to hack any Bootstrap JS files, and you can apply no-transition to any element, not just a collapse!

.no-transition {
  -webkit-transition: height 0.01s;
  -moz-transition: height 0.01s;
  -ms-transition: height 0.01s;
  -o-transition: height 0.01s;
  transition: height 0.01s;
}

回答2:

Bootstrap adds collapsing class during the animation, so it has to be overwritten.

.navbar-collapse.collapsing {
  -webkit-transition: height 0.01s;
  -moz-transition: height 0.01s;
  -ms-transition: height 0.01s;
  -o-transition: height 0.01s;
  transition: height 0.01s;

}

回答3:

A simple, non-CSS method to disable the animation using jQuery is:

$.support.transition = false

回答4:

Add it on a custom css file just after calling bootstrap.css

.collapsing {
  -webkit-transition: height 0.01s;
  -moz-transition: height 0.01s;
  -ms-transition: height 0.01s;
  -o-transition: height 0.01s;
  transition: height 0.01s;

}

回答5:

Of course, transitioning height even for a very short period will still trigger paint, thus the browser will have to do work that will most likely dip the frame rate to 30 or so. Editing the bootstrap files also isn't ideal, because of added update complications.

If this is still something that you'd like to do to your site, the good news is that the current bootstrap version doesn't seem to have transitions for navbar anymore. http://getbootstrap.com/components/#navbar

回答6:

By this code below you will get the navbar default open. The trick is setting height of div with class container and nav-collapse to auto. If you also want the three-lined menu button to be totally inactive then remove data-toggle="collapse" from the below code.

 <div class="navbar">
    <div class="navbar-inner">
    <div class="container" style="height:auto">

    <!-- .btn-navbar is used as the toggle for collapsed navbar content -->
    <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>

    <!-- Be sure to leave the brand out there if you want it shown -->
    <a class="brand" href="#">Project name</a>

    <!-- Everything you want hidden at 940px or less, place within here -->
    <div class="nav-collapse" style="height:auto">
    <!-- .nav, .navbar-search, .navbar-form, etc -->
<ul class="nav">
<li><a href="#">Link 1</a></li>   
 <li><a href="#">Link 2</a></li>
<li><a href="#">Link 3</a></li>
    </ul>
    </div>

    </div>
    </div>
    </div>

来源：https://stackoverflow.com/questions/13119906/turning-off-twitter-bootstrap-navbar-transition-animation

标签

css3

twitter-bootstrap

css-transitions