如何获取 css3 过渡结束的回调

Question

我正在尝试以下内容，但我根本没有收到回调

$("#panel").addClass("showPane");
$("#close_wikipedia").on("click", function() {
  $("#panel").addClass("close_wiki");
});
if ($("#panel").hasClass("close_wiki")) {
  $(this).bind("transitionend webkitTransitionEnd oTransitionEnd MSTransitionEnd", function() {
    $("#panel").removeClass("close_wiki showPane");
  });
}

#panel {
  position: fixed;
  background: #444;
  height: 100%;
  width: 50vw;
  right: -100vw;
  transition: right 0.4s ease-in-out;
  -o-transition: right 0.4s ease-in-out;
  -ms-transition: right 0.4s ease-in-out;
  -moz-transition: right 0.4s ease-in-out;
  -webkit-transition: right 0.4s ease-in-out;
  z-index: 9999;
  top: 0;
  bottom: 0;
  height: 100vh;
  overflow-y: auto;
}
#panel.showPane {
  right: 0;
}
#panel.close_wiki {
  right: -100vw;
  transition: right 0.4s ease-in-out;
  -o-transition: right 0.4s ease-in-out;
  -ms-transition: right 0.4s ease-in-out;
  -moz-transition: right 0.4s ease-in-out;
  -webkit-transition: right 0.4s ease-in-out;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="panel">
  <h2>Wikipedia results</h2>
  <div class="panel-group" id="accordionWiki" role="tablist" aria-multiselectable="true"></div>
  <button id="close_wikipedia" type="button" class="btn btn-danger">Close Wiki</button>
</div>

Answer 1

问题是因为您仅在页面加载时检查#panel是否具有close_wiki类 - 该类永远不会触发，因为它是在单击按钮时添加的。

而是挂接 transitionEnded 事件加载，并等待它在 CSS 转换完成后触发。另请注意，bind()已弃用。您应该改用on()。试试这个：

$("#close_wikipedia").on("click", function() {
  $("#panel").removeClass("showPane");
});

#panel {
  position: fixed;
  background: #444;
  height: 100%;
  width: 50vw;
  right: -100vw;
  transition: right 0.4s ease-in-out;
  -o-transition: right 0.4s ease-in-out;
  -ms-transition: right 0.4s ease-in-out;
  -moz-transition: right 0.4s ease-in-out;
  -webkit-transition: right 0.4s ease-in-out;
  z-index: 9999;
  top: 0;
  bottom: 0;
  height: 100vh;
  overflow-y: auto;
}
#panel.showPane {
  right: 0;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="panel" class="showPane">
  <h2>Wikipedia results</h2>
  <div class="panel-group" id="accordionWiki" role="tablist" aria-multiselectable="true"></div>
  <button id="close_wikipedia" type="button" class="btn btn-danger">Close Wiki</button>
</div>

另请注意，您只需在 #Panel 元素上切换 showPane 类，即可使逻辑更简单（并完全无需挂钩到transitionEnded。

$('#panel').addClass('showPane');
$("#close_wikipedia").on("click", function() {
  $("#panel").removeClass("showPane");
});

#panel {
  position: fixed;
  background: #444;
  height: 100%;
  width: 50vw;
  right: -100vw;
  transition: right 0.4s ease-in-out;
  -o-transition: right 0.4s ease-in-out;
  -ms-transition: right 0.4s ease-in-out;
  -moz-transition: right 0.4s ease-in-out;
  -webkit-transition: right 0.4s ease-in-out;
  z-index: 9999;
  top: 0;
  bottom: 0;
  height: 100vh;
  overflow-y: auto;
}
#panel.showPane {
  right: 0;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="panel">
  <h2>Wikipedia results</h2>
  <div class="panel-group" id="accordionWiki" role="tablist" aria-multiselectable="true"></div>
  <button id="close_wikipedia" type="button" class="btn btn-danger">Close Wiki</button>
</div>

Answer 2

您不需要在页面加载和基于它的绑定事件时检查close_wiki类。由于此类是在单击close_wikipedia时动态添加的。您可以使用事件委托来实现单击close_wiki时转换事件的回调。

$("#panel").addClass("showPane");
$("#close_wikipedia").on("click", function() {
  $("#panel").addClass("close_wiki");
});
 $(document).on("transitionend webkitTransitionEnd oTransitionEnd MSTransitionEnd",".close_wiki", function() {
    alert("called");
    $("#panel").removeClass("close_wiki showPane");
  });

#panel {
  position: fixed;
  background: #444;
  height: 100%;
  width: 50vw;
  right: -100vw;
  transition: right 0.4s ease-in-out;
  -o-transition: right 0.4s ease-in-out;
  -ms-transition: right 0.4s ease-in-out;
  -moz-transition: right 0.4s ease-in-out;
  -webkit-transition: right 0.4s ease-in-out;
  z-index: 9999;
  top: 0;
  bottom: 0;
  height: 100vh;
  overflow-y: auto;
}
#panel.showPane {
  right: 0;
}
#panel.close_wiki {
  right: -100vw;
  transition: right 0.4s ease-in-out;
  -o-transition: right 0.4s ease-in-out;
  -ms-transition: right 0.4s ease-in-out;
  -moz-transition: right 0.4s ease-in-out;
  -webkit-transition: right 0.4s ease-in-out;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="panel">
  <h2>Wikipedia results</h2>
  <div class="panel-group" id="accordionWiki" role="tablist" aria-multiselectable="true"></div>
  <button id="close_wikipedia" type="button" class="btn btn-danger">Close Wiki</button>
</div>