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In order to create a down arrow like this: , what class should we apply to the element?
Answer: caret
The Bootstrap Dropdown plugin will toggle a specific class on our element in order to make the dropdown visible. Will the following dropdown menu be visible when the page loads?
<div class=‘btn-group in‘> <a href=‘book.html‘ data-target=‘#‘ data-toggle=‘dropdown‘ class=‘btn btn-default‘>Boot Tickets Now <span class=‘caret‘></span></a> <ul class=‘dropdown-menu‘> <li><a href=‘book-teleporter.html‘>Teleporter</a></li> <li><a href=‘book-elevator.html‘>Orbital Elevator</a></li> <li><a href=‘book-rocketbus.html‘>RocketBus</a></li> </ul> </div>
Yes, it will be visible when the page loads.
No, it will not be visible when the page loads.
If you want it open, add a ‘open‘ class to the ul.
We can use the Dropdown Plugin for more than just navigation components. One other place we could use it is on our "Take the Tour" button. Follow the tasks below to convert this button into a Dropdown.
Within our "Take the Tour" button, we‘ll want to show a little down arrow so our travelers are encouraged to click on it. Add this icon after the text.
<!DOCTYPE html> <html> <head> <title>Blasting Off With Bootstrap</title> <link href=‘css/bootstrap.min.css‘ rel=‘stylesheet‘> <link href=‘css/main.css‘ rel=‘stylesheet‘> </head> <body> <div class=‘navbar navbar-default navbar-static-top‘> <div class=‘container‘> <a href=‘/‘ class=‘navbar-brand‘>Blasting Off With Bootstrap</a> <ul class=‘nav navbar-nav navbar-right‘> <li><a href=‘tickets.html‘>Tickets</a></li> <li><a href=‘stations.html‘>Stations</a></li> <li><a href=‘about.html‘>About</a></li> </ul> </div> </div> <div class=‘container‘> <div class=‘row well well-lg‘> <div class=‘col-md-6‘> <h2>The Fastest Way to Space</h2> <p class=‘lead‘>Make your way to space in the comfort of your own rocket, elevator or transporter.</p> <div class=‘btn-group‘> <button type=‘button‘ class=‘btn btn-default btn-lg‘> Take the Tour </button> <ul> <li><a href=‘#‘>Transporter</a></li> <li><a href=‘#‘>Orbital Elevator</a></li> <li><a href=‘#‘>RocketBus</a></li> <li><a href=‘#‘>Learn More</a></li> </ul> </div> <button type=‘button‘ class=‘btn btn-lg btn-primary‘>Book Tickets Now</button> </div> <div class=‘col-md-6 visible-md visible-lg‘> <img src=‘images/img-header.jpg‘ alt=‘Blast off with Bootstrap‘ /> </div> </div> <div class=‘row text-center features‘> <div class=‘col-sm-4 col-xs-10 col-xs-offset-1 col-sm-offset-0‘> <i class=‘glyphicon glyphicon-briefcase‘></i> <h3>Book Today!</h3> <p>Even if you‘re traveling tomorrow, you can still get tickets today. We have a number of conveniently located ports around the globe to service everyone.</p> </div> <div class=‘col-sm-4 col-xs-6‘> <i class=‘glyphicon glyphicon-random‘></i> <h3>Go Anywhere</h3> <p>If you need to get to space today, why not try out a transporter? Despite the claims, there are have been no deaths in the last 6 weeks!</p> </div> <div class=‘col-sm-4 col-xs-6‘> <i class=‘glyphicon glyphicon-send‘></i> <h3>RocketBus®</h3> <p>For cheapest fares, catch the next RocketBus® to the stars. Cheaper on your wallet, and easiest way to make friends.</p> </div> </div> </div> <div class=‘quote‘> <div class=‘container‘> <blockquote> <p>Any sufficiently advanced technology is indistinguishable from magic.</p> <footer>Arthur C. Clarke in <cite title="Source Title">Profiles of the Future</cite></footer> </blockquote> </div> </div> <div class=‘container transport-systems‘> <div class=‘row‘> <div class=‘col-md-10 col-md-offset-1‘> <h2>Our Transport Systems</h2> <p>Learn more about our transport systems to find out which one is right for you. Pick out the mode of transport that works for your budget and risk level.</p> </div> </div> <div class=‘row text-center‘> <div class=‘transporter col-md-3 col-md-offset-1 well well-sm‘> <h3>Transporter</h3> <ul class=‘list-unstyled‘> <li>8 second travel time</li> <li>Chance of death only 1 in 7,593</li> <li>Low price of only $15.99!</li> </ul> <p><button class=‘btn btn-info‘><i class=‘glyphicon glyphicon-transfer‘></i> Beam Me Up!</button></p> </div> <div class=‘space-elevator col-md-3 col-md-offset-1 well well-sm‘> <h3>Space Elevator</h3> <ul class=‘list-unstyled‘> <li>8 hour scenic ride</li> <li>Only 1 horrific death per 12,456</li> <li>Only $45.99 if you book today!</li> </ul> <p><button class=‘btn btn-info‘><i class=‘glyphicon glyphicon-sort‘></i> Board the Elevator!</button></p> </div> <div class=‘rocketbus col-md-3 col-md-offset-1 well well-sm‘> <h3>RocketBus</h3> <ul class=‘list-unstyled‘> <li>8 minute scenic ride</li> <li>Plunging death rate of under 1/100k</li> <li>$74.99 lets you blast off today!</li> </ul> <p><button class=‘btn btn-info‘><i class=‘glyphicon glyphicon-plane‘></i> Blast Off!</button></p> </div> </div> </div> <div class=‘quote‘> <div class=‘container‘> <blockquote> <p>A dream that became a reality and spread throughout the stars.</p> <footer>Captain Kirk in <cite title="Source Title">Whom Gods Destroy</cite></footer> </blockquote> </div> </div> <div class=‘container‘> <div class=‘row‘> <div class=‘col-md-8‘> <h2>Plan Your Trip Today!</h2> <ul class=‘nav nav-tabs‘> <li class=‘active‘><a href=‘#time‘>Todays Times</a></li> <li><a href=‘#deals‘>Hot Deals</a></li> <li><a href=‘#forecast‘>Forecast</a></li> </ul> <div class=‘tab-content‘> <div class=‘tab-pane fade active‘ id=‘time‘> <p>Todays Time here</p> </div> <div class=‘tab-pane fade‘ id=‘deals‘> <p>Deals here</p> </div> <div class=‘tab-pane fade‘ id=‘forecast‘> <p>Forecast</p> </div> </div> </div> <div class=‘col-md-3 col-md-offset-1‘> <div class=‘panel-group‘> <div class=‘panel panel-success‘> <div class=‘panel-heading‘> <h4 class=‘panel-title‘> <a data-toggle=‘collapse‘ data-parent=‘.panel-group‘ href=‘#systemsOperational‘>All Systems Operational</a> </h4> </div> <div id=‘systemsOperational‘ class=‘panel-collapse collapse in‘> <div class=‘panel-body‘> <p>All systems are operational</p> <ul class=‘list-unstyled‘> <li><i class=‘glyphicon glyphicon-ok‘></i> Transporters</li> <li><i class=‘glyphicon glyphicon-ok‘></i> Space Elevator</li> <li><i class=‘glyphicon glyphicon-ok‘></i> RocketBus</li> </ul> </div> </div> </div> <div class=‘panel panel-warning‘> <div class=‘panel-heading‘> <h4 class=‘panel-title‘> <a data-toggle=‘collapse‘ data-parent=‘.panel-group‘ href=‘#weatherAlert‘>Weather Alert</a> </h4> </div> <div id=‘weatherAlert‘ class=‘panel-collapse collapse‘> <div class=‘panel-body‘> <p>The National Weather Service has issued a solar flare watch for the following time periods. Please plan accordingly:</p> <ul class=‘list-unstyled‘> <li><strong>February 9th, 21:43</strong></li> <li><strong>May 18, 19:82</strong></li> <li><strong>July 4, 08:42</strong></li> </ul> </div> </div> </div> <div class=‘panel panel-danger‘> <div class=‘panel-heading‘> <h4 class=‘panel-title‘> <a data-toggle=‘collapse‘ data-parent=‘.panel-group‘ href=‘#transportationWarning‘>Transportation Generals Warning: Transporters</a> </h4> </div> <div id=‘transportationWarning‘ class=‘panel-collapse collapse‘> <div class=‘panel-body‘> <p>Technically, transporting means making a clone of yourself and killing off the other one. If you believe in a soul, you should be aware of this fact before attempting travel using a transporter.</p> </div> </div> </div> </div> </div> </div> </div> <div class=‘footer‘> <div class=‘container‘> <div class=‘row‘> <div class=‘col-md-3 col-sm-4 col-xs-6‘> <h4>Who We Are</h4> <p><i>Blasting Off With Bootstrap</i> is the fastest way to space. <a href=‘tickets.html‘>Book your ticket today</a>!</p> <p><a href=‘about.html‘>More About Us <i class=‘glyphicon glyphicon-arrow-right‘></i></a></p> </div> <div class=‘col-md-offset-1 col-sm-2 col-xs-6‘> <h4>Links</h4> <ul class=‘list-unstyled‘> <li><a href=‘/‘>Home</a></li> <li><a href=‘tickets.html‘>Tickets</a></li> <li><a href=‘stations.html‘>Stations</a></li> </ul> </div> <div class=‘clearfix visible-xs‘></div> <div class=‘col-sm-2 col-xs-6‘> <h4>Stay in Touch</h4> <ul class=‘list-unstyled‘> <li><a href=‘about.html‘>About</a></li> <li><a href=‘contact.html‘>Contact Us</a></li> <li><a href=‘/blog‘>Blog</a></li> <li><a href=‘http://twitter.com/codeschool‘>Twitter</a></li> <li><a href=‘http://facebook.com/codeschool‘>Facebook</a></li> </ul> </div> <div class=‘col-md-3 col-md-offset-1 col-sm-4 col-xs-6‘> <h4>Contact Us</h4> <ul class=‘list-unstyled‘> <li><i class=‘glyphicon glyphicon-globe‘></i> Orlando, FL</li> <li><i class=‘glyphicon glyphicon-phone‘></i> 1-555-blast-off</li> <li><i class=‘glyphicon glyphicon-envelope‘></i> <a href=‘mailto:blastingoff@codeschool.com‘>blastingoff@codeschool.com</a></li> </ul> <p>Blasting Off With Bootstrap ©2214.</p> </div> </div> </div> </div> <script src=‘https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js‘></script> <script src=‘js/bootstrap.min.js‘></script> <script> $(function() { $(‘.nav-tabs a‘).click(function (e) { e.preventDefault(); $(this).tab(‘show‘); }); }); </script> </body> </html>
Within our "Take the Tour" button, we‘ll want to show a little down arrow so our travelers are encouraged to click on it. Add this icon after the text.
<button type=‘button‘ class=‘btn btn-default btn-lg‘> Take the Tour<span class="caret"></span> </button>
Our list of links for this Dropdown is currently unstyled. Give it a Bootstrap class to indicate it is a Dropdown Menu.
<ul class="dropdown-menu"> <li><a href=‘#‘>Transporter</a></li> <li><a href=‘#‘>Orbital Elevator</a></li> <li><a href=‘#‘>RocketBus</a></li> <li><a href=‘#‘>Learn More</a></li> </ul>
In order to tie in the structure and behavior, we‘ll need to add a specific attribute to our button to let Bootstrap know this is a Dropdown. Add that attribute and value.
<button type=‘button‘ class=‘btn btn-default btn-lg‘ data-toggle="dropdown"> Take the Tour<span class="caret"></span> </button>
Our Dropdown is working! But it seems a little weird we have our 3 transportation methods, and an unrelated link to "Learn More" in there. Go ahead and add a divider before the "Learn More" link.
<li><a href=‘#‘>Transporter</a></li> <li><a href=‘#‘>Orbital Elevator</a></li> <li><a href=‘#‘>RocketBus</a></li> <li class="divider"></li> <li><a href=‘#‘>Learn More</a></li>
Lastly, we want to indicate that the "Take the Tour" button will popup a dropdown rather than taking us to a new page. We could do this by adding a Glyphicon, but in this case there‘s an easier way with a class provided by Bootstrap.
Checkout the Bootstrap documentation on Button Dropdowns and add the dropdown-toggle class to the appropriate place.
<button type=‘button‘ class=‘btn btn-default btn-lg dropdown-toggle‘ data-toggle="dropdown"> Take the Tour<span class="caret"></span> </button>
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原文地址：http://www.cnblogs.com/Answer1215/p/4321146.html
