admin 管理员组

文章数量: 1086019

I need a little help please. I need to have a blue circle, a red circle, a blue square and a red square. I need to drag the red circle to the center of the red square and the blue circle to the center of the blue square. Unless I drag it to the correct position, it should revert to original position.

This is what I have so far: 

$("#draggable, #draggable2").draggable({
    revert: 'invalid', snap: "#droppable2"
});

$("#droppable").droppable({
    accept: '#draggable'
});

$("#droppable2").droppable({
    accept: '#draggable2',
});

/

I can't position them the circles to the center of the squares, how can I do that?

I need a little help please. I need to have a blue circle, a red circle, a blue square and a red square. I need to drag the red circle to the center of the red square and the blue circle to the center of the blue square. Unless I drag it to the correct position, it should revert to original position.

This is what I have so far: 

$("#draggable, #draggable2").draggable({
    revert: 'invalid', snap: "#droppable2"
});

$("#droppable").droppable({
    accept: '#draggable'
});

$("#droppable2").droppable({
    accept: '#draggable2',
});

http://jsfiddle/tM7cp/269/

I can't position them the circles to the center of the squares, how can I do that?

  • javascript
  • jquery
  • jquery-ui
  • drag-and-drop
Share Improve this question edited Nov 5, 2014 at 0:00 Owlvark 1,80318 silver badges28 bronze badges asked Nov 4, 2014 at 23:10 Sava VladSava Vlad 571 silver badge6 bronze badges
Add a ment  | 

2 Answers 2

Reset to default 8

You can manually snap the items to the center of droppables using jQuery Ui's position() utility method as follows (I changed your logic slightly to avoid repetition of code and CSS):

$(".draggable").draggable({
  revert: 'invalid'
});

$(".droppable").droppable({
  accept: function(item) {
    return $(this).data("color") == item.data("color");
  },
  drop: function(event, ui) {
    var $this = $(this);
    ui.draggable.position({
      my: "center",
      at: "center",
      of: $this,
      using: function(pos) {
        $(this).animate(pos, 200, "linear");
      }
    });
  }
});
.draggable {
  float: left;
  width: 100px;
  height: 100px;
  padding: 0.5em;
  margin: 10px 10px 10px 0;
  border: 1px solid black;
  border-radius: 50%;
}
#draggable {
  background-color: red;
}
#draggable2 {
  background-color: blue;
}
.droppable {
  padding: 0.5em;
  float: left;
  margin: 10px;
}
#droppable {
  width: 100px;
  height: 100px;
  background-color: red;
}
#droppable2 {
  width: 120px;
  height: 120px;
  background-color: blue;
}
<script src="https://ajax.googleapis./ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://code.jquery./ui/1.9.2/jquery-ui.js"></script>
<div id="draggable" class="draggable" data-color="red"></div>
<div id="draggable2" class="draggable" data-color="blue"></div>
<div id="droppable" class="droppable" data-color="red"></div>
<div id="droppable2" class="droppable" data-color="blue"></div>

Here is an updated example of TJ's response. I created a jQuery plugin that can be called to center the draggable item within the droppable region.

(function($) {
  $.fn.centerOnDrop = function(ui) {
    ui.draggable.position({
      my: 'center',
      at: 'center',
      of: this,
      using: function(pos) {
        $(this).animate(pos, 200, 'linear');
      }
    });
  };
})(jQuery);

$('.draggable').draggable({ revert: 'invalid' });

$('.droppable').droppable({
  accept: function($item) {
    return $(this).data('color') === $item.data('color');
  },
  drop: function(event, ui) {
    $(this).centerOnDrop(ui);
  }
});
html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  justify-items: center;
  align-items: center;
}

.draggable   { width: 4em; height: 4em; border-radius: 50%;         }
#draggable-1 { background-color: pink;      border: 1px solid red;  }
#draggable-2 { background-color: lightblue; border: 1px solid blue; }

.droppable   { width: 5em; height: 5em; }
#droppable-1 { background-color: red;   }
#droppable-2 { background-color: blue;  }
<script src="https://cdnjs.cloudflare./ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare./ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<div id="draggable-1" class="draggable" data-color="red"></div>
<div id="draggable-2" class="draggable" data-color="blue"></div>
<div id="droppable-1" class="droppable" data-color="red"></div>
<div id="droppable-2" class="droppable" data-color="blue"></div>

本文标签： javascriptjQuery UI drag and drop snap to centerStack Overflow

版权声明：本文标题：javascript - jQuery UI drag and drop snap to center - Stack Overflow 内容由网友自发贡献，该文观点仅代表作者本人， 转载请联系作者并注明出处：http://roclinux.cn/p/1744011358a2518210.html， 本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容，一经查实，本站将立刻删除。