重新出现的动画完成后，元素消失

Question

任何人都可以在重新出现的动画完成后第3次点击切换开关.project-list时，让我深入了解元素为什么会消失（隐藏）。我的if / else语句中有缺陷吗？

这是动画类slideDown（消失）和slideUp的CSS。

http://www.justinaguilar.com/animations/css/animations.css

var main = function() {

  var enabled = false;
  //$('#project-box').hide();

  $('.project-list').click(function() {
    debugger;
    if (enabled == false) {
      $('#project-box').addClass("slideUp");
      $('#project-box').removeClass("slideDown");
      enabled = true;
      $('#project-box').show();

    } else {
      $('#project-box').removeClass("slideUp");
      $('#project-box').addClass("slideDown");
      enabled = false;

      $("#project-box").on('webkitAnimationEnd', function() {
        $('#project-box').hide();
      });
    }


    //$('#project-box').toggleClass("slideUp");
  });

  //    $(window).scroll(function () {
  //        $('#project-box').each(function () {
  //            var imagePos = $(this).offset().top;
  //
  //            var topOfWindow = $(window).scrollTop();
  //            if (imagePos < topOfWindow + 400) {
  //                $(this).addClass("slideUp");
  //            }
  //        });
  //    });

  //$('#carousel').carousel('cycle');
}

$(document).ready(main);

/* Exit Animation
-------------------------------------------------- */

.slideDownEdit {
  animation-name: slideDown;
  -webkit-animation-name: slideDown;
  animation-duration: 1s;
  -webkit-animation-duration: 1s;
  animation-timing-function: ease;
  -webkit-animation-timing-function: ease;
  visibility: hidden !important;
}
@keyframes slideDown {
  0% {
    transform: translateY(-100%);
  }
  50% {
    transform: translateY(8%);
  }
  65% {
    transform: translateY(-4%);
  }
  80% {
    transform: translateY(4%);
  }
  95% {
    transform: translateY(-2%);
  }
  100% {
    transform: translateY(0%);
  }
}
@-webkit-keyframes slideDown {
  0% {
    -webkit-transform: translateY(0%);
  }
  100% {
    -webkit-transform: translateY(500%);
    visibility: hidden;
  }
}
/* Footer
-------------------------------------------------- */

.footer {
  background-color: #dddee1;
  bottom: 0;
  width: 100%;
  /* Set the fixed height of the footer here */
  height: 60px;
  border: 1px solid grey;
}
.footer p {
  font-size: 18px;
  margin-top: 10px;
  color: #777;
  position: absolute;
}
.footer a {
  color: #b55e5e;
  font-size: 16px;
  margin-top: 10px;
}
.footer .pull-right {
  color: #b55e5e;
  font-size: 16px;
  margin-top: 10px;
  right: 10%;
}
/* Featurettes
------------------------- */

.featurette-divider {
  margin: 80px 0;
  /* Space out the Bootstrap <hr> more */
}
/* Thin out the marketing headings */

.featurette-heading {
  font-weight: 300;
  line-height: 1;
  letter-spacing: -1px;
  margin-top: 120px;
  font-size: 50px;
  display: inline-block;
}
/* Project Box 
------------------------- */

#project-box {
  text-align: center;
  cursor: pointer;
  border: 3px solid #636366;
  cursor: pointer;
  width: 75%;
  margin: auto;
  visibility: hidden;
}
#project-divider.featurette-divider {
  margin: 10px 0;
}
#project-box a {
  font-size: 30px;
  margin-left: 300px;
  margin-right: 100px;
  color: darkred;
  display: block;
  margin: auto;
}
#project-box p {
  font-size: 20px;
  color: dimgrey;
}
.project-list {
  cursor: pointer;
  color: darkred;
}
.slider {
  overflow-y: scroll;
  max-height: 500px;
  /* approximate max height */
  transition-property: all;
  transition-duration: .5s;
  transition-timing-function: cubic-bezier(0, 1, 0.5, 1);
}
.slider.closed {
  max-height: 0;
}
.slideUp {
  animation-name: slideUp;
  -webkit-animation-name: slideUp;
  animation-duration: 1s;
  -webkit-animation-duration: 1s;
  animation-timing-function: ease;
  -webkit-animation-timing-function: ease;
  visibility: visible !important;
}
@keyframes slideUp {
  0% {
    transform: translateY(100%);
  }
  50% {
    transform: translateY(-8%);
  }
  65% {
    transform: translateY(4%);
  }
  80% {
    transform: translateY(-4%);
  }
  95% {
    transform: translateY(2%);
  }
  100% {
    transform: translateY(0%);
  }
}
@-webkit-keyframes slideUp {
  0% {
    -webkit-transform: translateY(100%);
  }
  50% {
    -webkit-transform: translateY(-8%);
  }
  65% {
    -webkit-transform: translateY(4%);
  }
  80% {
    -webkit-transform: translateY(-4%);
  }
  95% {
    -webkit-transform: translateY(2%);
  }
  100% {
    -webkit-transform: translateY(0%);
  }
}

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Murray Studio</title>
  <meta name="description" content="Main Page for Murray Studio">
  <link rel="icon" href="http://s3.amazonaws.com/codecademy-content/courses/ltp2/img/uber/close.png">

  <!-- Bootstrap -->
  <link href="css/bootstrap.min.css" rel="stylesheet">
  <link rel="stylesheet" href="css/animations.css">
  <link rel="stylesheet" href="main.css">
</head>

<body>



  <!-- Wrap the rest of the page in another container to center all the content. -->

  <div class="container marketing">

    <!-- START THE FEATURETTES -->

    <hr class="featurette-divider">

    <div class="row featurette">
      <div class="first-featurette">
        <div class="col-md-7">
          <a class="featurette-heading" href="#">Projects.</a>
          <p class="lead">Donec ullamcorper nulla non metus auctor fringilla. Vestibulum id ligula porta felis euismod semper. Praesent commodo cursus magna, vel scelerisque nisl consectetur. Fusce dapibus, tellus ac cursus commodo.</p>
          <p class="project-list">See Projects.</p>
          <div id="object" class="slideUp">
            <div id="object" class="slideDownEdit">
              <div id="project-box">
                <a>Embraer adds third Legacy 500 prototype to flight test campaign</a>
                <hr class="featurette-divider" id="project-divider">
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>

              </div>
            </div>
          </div>
        </div>
        <div class="col-md-5">
          <img class="featurette-image img-responsive center-block" src="http://a1.dspnimg.com/data/l/423341110329_Qy737Vid_l.jpg" alt="Generic placeholder image">
        </div>
      </div>
    </div>

    <hr class="featurette-divider">
  </div>

  <!-- /END THE FEATURETTES -->

  <!-- FOOTER -->
  <footer class="footer">
    <div class="container">
      <p class="pull-right"><a href="#">Back to top</a>
      </p>
      <p>&copy; 2014 Company, Inc. &middot; <a href="#">Privacy</a> &middot; <a href="#">Terms</a>
      </p>
    </div>
  </footer>

  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
  <script src="js/bootstrap.min.js"></script>
  <script src="main.js"></script>
</body>


</html>

Answer 1

您的问题是因为在webkitAnimationEnd事件处理程序中您没有检查状态。下面的代码是一个事件处理程序，这意味着每次#project-box上的动画结束时，该框都会被隐藏。这种情况仅在第3次发生，因为您仅在第二次单击时附加事件处理程序。

  $("#project-box").on('webkitAnimationEnd', function() {
      $('#project-box').hide();
  });

您可以通过检查事件处理程序中的状态来修复它，如下面的代码所示：

var main = function() {

  var enabled = false;
  //$('#project-box').hide();

  $('.project-list').click(function() {
    //debugger;
    if (enabled == false) {
      $('#project-box').addClass("slideUp");
      $('#project-box').removeClass("slideDown");
      enabled = true;
      $('#project-box').show();

    } else {
      $('#project-box').removeClass("slideUp");
      $('#project-box').addClass("slideDown");
      enabled = false;
      $("#project-box").on('webkitAnimationEnd', function() {
        if (enabled == false)
          $('#project-box').hide();
      });
    }


    //$('#project-box').toggleClass("slideUp");
  });

  //    $(window).scroll(function () {
  //        $('#project-box').each(function () {
  //            var imagePos = $(this).offset().top;
  //
  //            var topOfWindow = $(window).scrollTop();
  //            if (imagePos < topOfWindow + 400) {
  //                $(this).addClass("slideUp");
  //            }
  //        });
  //    });

  //$('#carousel').carousel('cycle');
}

$(document).ready(main);

/* Exit Animation
-------------------------------------------------- */

.slideDownEdit {
  animation-name: slideDown;
  -webkit-animation-name: slideDown;
  animation-duration: 1s;
  -webkit-animation-duration: 1s;
  animation-timing-function: ease;
  -webkit-animation-timing-function: ease;
  visibility: hidden !important;
}
@keyframes slideDown {
  0% {
    transform: translateY(-100%);
  }
  50% {
    transform: translateY(8%);
  }
  65% {
    transform: translateY(-4%);
  }
  80% {
    transform: translateY(4%);
  }
  95% {
    transform: translateY(-2%);
  }
  100% {
    transform: translateY(0%);
  }
}
@-webkit-keyframes slideDown {
  0% {
    -webkit-transform: translateY(0%);
  }
  100% {
    -webkit-transform: translateY(500%);
    visibility: hidden;
  }
}
/* Footer
-------------------------------------------------- */

.footer {
  background-color: #dddee1;
  bottom: 0;
  width: 100%;
  /* Set the fixed height of the footer here */
  height: 60px;
  border: 1px solid grey;
}
.footer p {
  font-size: 18px;
  margin-top: 10px;
  color: #777;
  position: absolute;
}
.footer a {
  color: #b55e5e;
  font-size: 16px;
  margin-top: 10px;
}
.footer .pull-right {
  color: #b55e5e;
  font-size: 16px;
  margin-top: 10px;
  right: 10%;
}
/* Featurettes
------------------------- */

.featurette-divider {
  margin: 80px 0;
  /* Space out the Bootstrap <hr> more */
}
/* Thin out the marketing headings */

.featurette-heading {
  font-weight: 300;
  line-height: 1;
  letter-spacing: -1px;
  margin-top: 120px;
  font-size: 50px;
  display: inline-block;
}
/* Project Box 
------------------------- */

#project-box {
  text-align: center;
  cursor: pointer;
  border: 3px solid #636366;
  cursor: pointer;
  width: 75%;
  margin: auto;
  visibility: hidden;
}
#project-divider.featurette-divider {
  margin: 10px 0;
}
#project-box a {
  font-size: 30px;
  margin-left: 300px;
  margin-right: 100px;
  color: darkred;
  display: block;
  margin: auto;
}
#project-box p {
  font-size: 20px;
  color: dimgrey;
}
.project-list {
  cursor: pointer;
  color: darkred;
}
.slider {
  overflow-y: scroll;
  max-height: 500px;
  /* approximate max height */
  transition-property: all;
  transition-duration: .5s;
  transition-timing-function: cubic-bezier(0, 1, 0.5, 1);
}
.slider.closed {
  max-height: 0;
}
.slideUp {
  animation-name: slideUp;
  -webkit-animation-name: slideUp;
  animation-duration: 1s;
  -webkit-animation-duration: 1s;
  animation-timing-function: ease;
  -webkit-animation-timing-function: ease;
  visibility: visible !important;
}
@keyframes slideUp {
  0% {
    transform: translateY(100%);
  }
  50% {
    transform: translateY(-8%);
  }
  65% {
    transform: translateY(4%);
  }
  80% {
    transform: translateY(-4%);
  }
  95% {
    transform: translateY(2%);
  }
  100% {
    transform: translateY(0%);
  }
}
@-webkit-keyframes slideUp {
  0% {
    -webkit-transform: translateY(100%);
  }
  50% {
    -webkit-transform: translateY(-8%);
  }
  65% {
    -webkit-transform: translateY(4%);
  }
  80% {
    -webkit-transform: translateY(-4%);
  }
  95% {
    -webkit-transform: translateY(2%);
  }
  100% {
    -webkit-transform: translateY(0%);
  }
}

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Murray Studio</title>
  <meta name="description" content="Main Page for Murray Studio">
  <link rel="icon" href="http://s3.amazonaws.com/codecademy-content/courses/ltp2/img/uber/close.png">

  <!-- Bootstrap -->
  <link href="css/bootstrap.min.css" rel="stylesheet">
  <link rel="stylesheet" href="css/animations.css">
  <link rel="stylesheet" href="main.css">
</head>

<body>



  <!-- Wrap the rest of the page in another container to center all the content. -->

  <div class="container marketing">

    <!-- START THE FEATURETTES -->

    <hr class="featurette-divider">

    <div class="row featurette">
      <div class="first-featurette">
        <div class="col-md-7">
          <a class="featurette-heading" href="#">Projects.</a>
          <p class="lead">Donec ullamcorper nulla non metus auctor fringilla. Vestibulum id ligula porta felis euismod semper. Praesent commodo cursus magna, vel scelerisque nisl consectetur. Fusce dapibus, tellus ac cursus commodo.</p>
          <p class="project-list">See Projects.</p>
          <div id="object" class="slideUp">
            <div id="object" class="slideDownEdit">
              <div id="project-box">
                <a>Embraer adds third Legacy 500 prototype to flight test campaign</a>
                <hr class="featurette-divider" id="project-divider">
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>

              </div>
            </div>
          </div>
        </div>
        <div class="col-md-5">
          <img class="featurette-image img-responsive center-block" src="http://a1.dspnimg.com/data/l/423341110329_Qy737Vid_l.jpg" alt="Generic placeholder image">
        </div>
      </div>
    </div>

    <hr class="featurette-divider">
  </div>

  <!-- /END THE FEATURETTES -->

  <!-- FOOTER -->
  <footer class="footer">
    <div class="container">
      <p class="pull-right"><a href="#">Back to top</a>
      </p>
      <p>&copy; 2014 Company, Inc. &middot; <a href="#">Privacy</a> &middot; <a href="#">Terms</a>
      </p>
    </div>
  </footer>

  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
  <script src="js/bootstrap.min.js"></script>
  <script src="main.js"></script>
</body>


</html>

或者，在else循环执行后你可以detach the event handler但这意味着我们在每个循环中都进行了一个附加/分离循环，我认为这不是好事。 / p>

请注意，此答案仅发布以解释您的问题来源。我假设您将有更多（或不同的东西）需要使用额外的.show()和.hide()。

如果您的要求只是在切换开关时显示/隐藏元素，那么humble.rumble.6x3的答案中提供的方法是最简单的。

Answer 2

您可以切换类并轻松获得相同的效果，因为元素已经从画布上移开，无需应用隐藏或显示。

$('.project-list').click(function () {
    $('#project-box').toggleClass("slideUp");    
    $('#project-box').toggleClass("slideDown");
});

＆＃13;

＆＃13;

var main = function () {

    var enabled = false;
    //$('#project-box').hide();

    $('.project-list').click(function () {
        $('#project-box').toggleClass("slideUp");    
        $('#project-box').toggleClass("slideDown");
    });

    //    $(window).scroll(function () {
    //        $('#project-box').each(function () {
    //            var imagePos = $(this).offset().top;
    //
    //            var topOfWindow = $(window).scrollTop();
    //            if (imagePos < topOfWindow + 400) {
    //                $(this).addClass("slideUp");
    //            }
    //        });
    //    });

    //$('#carousel').carousel('cycle');
}

$(document).ready(main);

＆＃13;

/* Exit Animation
-------------------------------------------------- */

.slideDownEdit{
	animation-name: slideDown;
	-webkit-animation-name: slideDown;	

	animation-duration: 1s;	
	-webkit-animation-duration: 1s;

	animation-timing-function: ease;	
	-webkit-animation-timing-function: ease;	

	visibility: hidden !important;						
}

@keyframes slideDown {
	0% {
		transform: translateY(-100%);
	}
	50%{
		transform: translateY(8%);
	}
	65%{
		transform: translateY(-4%);
	}
	80%{
		transform: translateY(4%);
	}
	95%{
		transform: translateY(-2%);
	}			
	100% {
		transform: translateY(0%);
	}		
}

@-webkit-keyframes slideDown {
	0% {
		-webkit-transform: translateY(0%);
	}		
	100% {
		-webkit-transform: translateY(500%);
        visibility: hidden;
	}	
}

/* Footer
-------------------------------------------------- */

.footer {
    background-color: #dddee1;
    bottom: 0;
    width: 100%;
    /* Set the fixed height of the footer here */
    
    height: 60px;
    border: 1px solid grey;
}

.footer p {
    font-size: 18px;
    margin-top: 10px;
    color: #777;
    position: absolute;
}

.footer a {
    color: #b55e5e;
    font-size: 16px;
    margin-top: 10px;
}

.footer .pull-right {
    color: #b55e5e;
    font-size: 16px;
    margin-top: 10px;
    right: 10%;
}
/* Featurettes
------------------------- */

.featurette-divider {
    margin: 80px 0;
    /* Space out the Bootstrap <hr> more */
}

/* Thin out the marketing headings */

.featurette-heading {
    font-weight: 300;
    line-height: 1;
    letter-spacing: -1px;
    margin-top: 120px;
    font-size: 50px;
    display: inline-block;
}

/* Project Box 
------------------------- */

#project-box {
    text-align: center;
    cursor: pointer;
    border: 3px solid #636366;
    cursor: pointer;
    width: 75%;
    margin: auto;
    visibility: hidden;
}

#project-divider.featurette-divider{
    margin: 10px 0;
}

#project-box a {
    font-size: 30px;
    margin-left: 300px;
    margin-right: 100px;
    color: darkred;
    display: block;
    margin: auto;
}

#project-box p {
    font-size: 20px;
    color: dimgrey;
}

.project-list {
    cursor: pointer;
    color: darkred;
}

.slider {
	overflow-y: scroll;
	max-height: 500px; /* approximate max height */

	transition-property: all;
	transition-duration: .5s;
	transition-timing-function: cubic-bezier(0, 1, 0.5, 1);
}

.slider.closed {
	max-height: 0;
}

.slideUp{
	animation-name: slideUp;
	-webkit-animation-name: slideUp;	

	animation-duration: 1s;	
	-webkit-animation-duration: 1s;

	animation-timing-function: ease;	
	-webkit-animation-timing-function: ease;

	visibility: visible !important;	
}

@keyframes slideUp {
	0% {
		transform: translateY(100%);
	}
	50%{
		transform: translateY(-8%);
	}
	65%{
		transform: translateY(4%);
	}
	80%{
		transform: translateY(-4%);
	}
	95%{
		transform: translateY(2%);
	}			
	100% {
		transform: translateY(0%);
	}	
}

@-webkit-keyframes slideUp {
	0% {
		-webkit-transform: translateY(100%);
	}
	50%{
		-webkit-transform: translateY(-8%);
	}
	65%{
		-webkit-transform: translateY(4%);
	}
	80%{
		-webkit-transform: translateY(-4%);
	}
	95%{
		-webkit-transform: translateY(2%);
	}			
	100% {
		-webkit-transform: translateY(0%);
	}	
}

＆＃13;

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Murray Studio</title>
    <meta name="description" content="Main Page for Murray Studio">
    <link rel="icon" href="http://s3.amazonaws.com/codecademy-content/courses/ltp2/img/uber/close.png">

    <!-- Bootstrap -->
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <link rel="stylesheet" href="css/animations.css">
    <link rel="stylesheet" href="main.css">
</head>

<body>

    

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                    <a class="featurette-heading" href="#">Projects.</a>
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                                <a>Embraer adds third Legacy 500 prototype to flight test campaign</a>
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                                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>
                                <p>The third Legacy 500 has joined Embraer's flight test programme aimed at delivering the midsize business jet in 2014. The airtcraft, serial number 003...</p>

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