javascript Jquery UI 可排序占位符未显示在块列表中

Jquery UI sortable placeholder not showing up in block list

提问by achow

I have a few items in a ul being displayed as an inline-block. I'm able to sort them with jquery ui's sortable, but the placeholder is not showing up.

我在 ul 中有几个项目显示为内联块。我可以使用 jquery ui 的 sortable 对它们进行排序，但是占位符没有出现。

$(document).ready(function() {
  $('#sortableList').sortable({
    refreshPositions: true,
    opacity: 0.6,
    scroll: true,
    containment: 'parent',
    placeholder: 'placeholder',
    tolerance: 'pointer'
  }).disableSelection();
});

.sequencer {
   height: 110px;
   width: 600px;
   overflow-y: hidden;
   overflow-x: hidden;
 }
 .sequencer ul {
   white-space: nowrap;
   overflow-x: scroll;
   overflow-y: hidden;
 }
 .sequencer li {
   display: inline-block;
   padding-right: 10px;
   padding-left: 10px;
   text-align: center;
 }
 .sequencer img {
   display: block;
   height: 50px;
 }
 .placeholder {
   background: #f3f3f3;
   visibility: visible;
 }

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.12/jquery-ui.js"></script>
<div class='sequencer'>
  <ul id='sortableList'>
    <li>
      <img src='http://images.wikia.com/reddithistory/images/1/10/3-rage-face.png' />rage1</li>
    <li>
      <img src='http://images.wikia.com/reddithistory/images/1/10/3-rage-face.png' />rage2</li>
    <li>
      <img src='http://images.wikia.com/reddithistory/images/1/10/3-rage-face.png' />rage3</li>
    <li>
      <img src='http://images.wikia.com/reddithistory/images/1/10/3-rage-face.png' />rage4</li>
    <li>
      <img src='http://images.wikia.com/reddithistory/images/1/10/3-rage-face.png' />rage5</li>
  </ul>
</div>

回答by T J

Since the items you're dragging doesn't have an explicit height, You should use the option

由于您拖动的项目没有明确的高度，您应该使用该选项

forcePlaceholderSize.

If true, forces the placeholder to have a size.

forcePlaceholderSize.

如果为 true，则强制占位符具有大小。

No need to manually specify dimensions for placeholder.

无需手动指定占位符的尺寸。

$(document).ready(function() {
  $('#sortableList').sortable({
    refreshPositions: true,
    opacity: 0.6,
    scroll: true,
    containment: 'parent',
    placeholder: 'placeholder',
    tolerance: 'pointer',
    forcePlaceholderSize: true // <--- add this
  }).disableSelection();
});

.sequencer {
  height: 110px;
  width: 600px;
  overflow-y: hidden;
  overflow-x: hidden;
}
.sequencer ul {
  white-space: nowrap;
  overflow-x: scroll;
  overflow-y: hidden;
}
.sequencer li {
  display: inline-block;
  padding-right: 10px;
  padding-left: 10px;
  text-align: center;
}
.sequencer img {
  display: block;
  height: 50px;
}
.placeholder {
  background: #f3f3f3;
  visibility: visible;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.12/jquery-ui.js"></script>
<div class='sequencer'>
  <ul id='sortableList'>
    <li>
      <img src='http://images.wikia.com/reddithistory/images/1/10/3-rage-face.png' />rage1</li>
    <li>
      <img src='http://images.wikia.com/reddithistory/images/1/10/3-rage-face.png' />rage2</li>
    <li>
      <img src='http://images.wikia.com/reddithistory/images/1/10/3-rage-face.png' />rage3</li>
    <li>
      <img src='http://images.wikia.com/reddithistory/images/1/10/3-rage-face.png' />rage4</li>
    <li>
      <img src='http://images.wikia.com/reddithistory/images/1/10/3-rage-face.png' />rage5</li>
  </ul>
</div>

JSFiddle

JSFiddle

回答by Janez

Your placeholder will be visible if you set heightand widthto it.

如果你设置你的占位符将是可见的height，并width给它。

Check jsfiddle with your code: jsfiddle

用你的代码检查 jsfiddle：jsfiddle

回答by Swaroop

Add height width and opacity to your placeholder, then it will work fine

为占位符添加高度宽度和不透明度，然后它会正常工作