jQuery 动画到自动高度，关闭回到设置高度

Question

我有一个向下滑动开关 div，其中包含一个标题、内容和一个开关打开按钮。我已经设置了 fiddle，但 div 目前完全关闭，无法再次打开。我希望 div 接近的高度是标题的高度。我该如何解决这个问题？

$(function(){

var open = 1;

    $(".toggle").click(function () {
        if (open == 1) {
            $(".box").animate({"height":"toggle"}, 1000);
            open = 0;
            $( ".toggle" ).addClass( "open" );
        }
        else if (open == 0) {
            $(".box").animate({"height":"toggle"}, 1000);
            open = 1;
            $( ".toggle" ).removeClass( "open" );
        }
    });

 });

Answer 1

把按钮放在盒子外面看这个fiddle

$(function() {

  var open = 1;

  $(".toggle").click(function() {
    if (open == 1) {
      $(".box").animate({
        "height": "toggle"
      }, 1000);
      open = 0;
      $(".toggle").addClass("open");
    } else if (open == 0) {
      $(".box").animate({
        "height": "toggle"
      }, 1000);
      open = 1;
      $(".toggle").removeClass("open");
    }
  });

});

.box {
  position: fixed;
  z-index: 3000;
  left: 0;
  text-align: left;
  background: #fff;
  max-width: 250px;
  width: 100%;
  top: 15%;
}
.box h2 {
  /* fallback */
  /*background-color: #e9e9e9;
  background: url(images/linear_bg_2.png);
  background-repeat: repeat-x;*/
  /* Safari 4-5, Chrome 1-9 */
  background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#e9e9e9), to(#f6f6f6));
  /* Safari 5.1, Chrome 10+ */
  background: -webkit-linear-gradient(top, #e9e9e9, #f6f6f6);
  /* Firefox 3.6+ */
  background: -moz-linear-gradient(top, #e9e9e9, #f6f6f6);
  /* IE 10 */
  background: -ms-linear-gradient(top, #e9e9e9, #f6f6f6);
  /* Opera 11.10+ */
  background: -o-linear-gradient(top, #e9e9e9, #f6f6f6);
  line-height: 3rem;
  padding: 2rem;
  margin: 0;
  font-size: 1.6em;
}
.box {
  position: relative;
  z-index: 3000;
  left: 0;
  text-align: left;
  background: #fff;
  max-width: 100%;
  width: 100%;
  top: 0;
}
.toggle {
  width: 40px;
  height: 26px;
  outline: none;
  border: none!important;
  box-shadow: none;
  border-radius: 3px;
}
.toggle.open {}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="box">



  <h2>title here</h2>

  <div>

    Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas
    sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora
    incidunt ut labore et dolore magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in ea voluptate
    velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?

  </div>

</div>
<button class="toggle">open</button>

jQuery 动画到自动高度，关闭回到设置高度

jQuery Animate to auto height, close back up to set height

jquery

jquery-animate

toggle

slidedown