jQuery UI (Droppable) : Draggable element not placed at mouse pointer if droppable has css position relative/absolute

Question

我正在使用 jquery ui 拖放。
如果可放置 div ( #dropContainer ) 的 css 位置为相对/绝对/固定，则放置的元素不会放置在我的鼠标指针上。

<div id="dropContainer" style="position:relative;"></div>

If I remove the position for droppable div, it is working as expected.But need to use the position for some obvious reasons

draggableInputNo = 0;

var buttonElement = '<div class="button" style="width:200px;">Button</div>'
var textElement = '<div class="text">Text Element</div>'

$(function() {
  $("#dropContainer").droppable({
    drop: function(event, ui) {
      $element = ui.helper.clone();
      $element.resizable();
      $element.draggable();
      $element.selectable();

      if (ui.draggable.hasClass('draggableInput text')) {
        draggableInputNo++;
        $element.attr("id", 'draggableInput' + draggableInputNo);
        $element.appendTo(this);
        $element.append(textElement);
      }
      else if (ui.draggable.hasClass('draggableInput button')) {
        draggableInputNo++;
        $element.attr("id", 'draggableInput' + draggableInputNo);
        $element.appendTo(this);
        $element.append(buttonElement);
      }
    }
  });

  $(".draggableInput").draggable({
    //containment: '#rpWebPushPopupContainer',
    cursor: 'move',
    helper: draggableInputHelper,
  });

});

function draggableInputHelper(event) {
  return '<div id="draggableInput' + draggableInputNo + '" class="draggableInputHelper resizable" ></div>'
}

.draggableInput {
  width: 50px;
  height: 30px;
  padding: 1em;
  float: left;
  margin: 10px 10px 10px 0;
  background-color: #9933ff;
  border-radius: 10px;
  border: 1px solid #9933ff;
}

.draggableInputHelper {
  width: 100px;
  height: 30px;
  padding: 0.5em;
  margin: 10px 10px 10px 0;
  background-color: #006699;
  border-radius: 10px;
  border: 1px solid #006699;
  color:#ffffff;
}

#dropContainer {
  width: 300px;
  height: 200px;
  padding: 0.5em;
  margin: 10px;
  float: left;
  border: 1px solid #867979;
  border-radius: 4px;
  background-color: yellow;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.9.1/jquery-ui.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.9.1/themes/base/jquery-ui.min.css" />

<div class="draggableInput text">Text</div>
<div class="draggableInput button">Button</div>

<div id="dropContainer" style="position:relative;"></div>

Answer 1

当您可以在 div 内放置时即 relative , 包含在 droppable 中的元素会获得不必要添加到它的父元素的偏移位置。所以删除多余的 offset在 drop 回调函数中。
调整您的位置，如下所示。

var parent = $('#dropContainer.ui-droppable');
var leftAdjust = $element.position().left - parent.offset().left;
var topAdjust = $element.position().top - parent.offset().top;
$element.css({
      left: leftAdjust,
      top: topAdjust
      })

draggableInputNo = 0;

var buttonElement = '<div class="button" style="width:200px;">Button</div>'
var textElement = '<div class="text">Text Element</div>'

$(function() {
  $("#dropContainer").droppable({
    drop: function(event, ui) {
      $element = ui.helper.clone();
      $element.resizable();
      $element.draggable();
      $element.selectable();

      if (ui.draggable.hasClass('draggableInput text')) {
        draggableInputNo++;
        $element.attr("id", 'draggableInput' + draggableInputNo);
        $element.appendTo(this);
        $element.append(textElement);
        var parent = $('#dropContainer.ui-droppable');
        var leftAdjust = $element.position().left - parent.offset().left;
        var topAdjust = $element.position().top - parent.offset().top;
        $element.css({
          left: leftAdjust,
          top: topAdjust
        });
      } else if (ui.draggable.hasClass('draggableInput button')) {
        draggableInputNo++;
        $element.attr("id", 'draggableInput' + draggableInputNo);
        $element.appendTo(this);
        $element.append(buttonElement);
        var parent = $('#dropContainer.ui-droppable');
        var leftAdjust = $element.position().left - parent.offset().left;
        var topAdjust = $element.position().top - parent.offset().top;
        $element.css({
          left: leftAdjust,
          top: topAdjust
        });
      }
    }
  });

  $(".draggableInput").draggable({
    //containment: '#rpWebPushPopupContainer',
    cursor: 'move',
    helper: draggableInputHelper,
  });

});

function draggableInputHelper(event) {
  return '<div id="draggableInput' + draggableInputNo + '" class="draggableInputHelper resizable" ></div>'
}

.draggableInput {
  width: 50px;
  height: 30px;
  padding: 1em;
  float: left;
  margin: 10px 10px 10px 0;
  background-color: #9933ff;
  border-radius: 10px;
  border: 1px solid #9933ff;
}

.draggableInputHelper {
  width: 100px;
  height: 30px;
  padding: 0.5em;
  margin: 10px 10px 10px 0;
  background-color: #006699;
  border-radius: 10px;
  border: 1px solid #006699;
  color: #ffffff;
}

#dropContainer {
  width: 300px;
  height: 200px;
  padding: 0.5em;
  margin: 10px;
  float: left;
  border: 1px solid #867979;
  border-radius: 4px;
  background-color: yellow;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.9.1/jquery-ui.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.9.1/themes/base/jquery-ui.min.css" />

<div class="draggableInput text">Text</div>
<div class="draggableInput button">Button</div>

<div id="dropContainer" style="position:relative;"></div>