创建重叠的可拖动div [英] Creating overlapping draggable divs

问题描述

在按钮单击事件上，将创建一个新的div.创建div后，借助于jqueryui可拖动 PLUGIN 的帮助，它变得可拖动.我在尝试将div堆叠到另一个顶部时遇到了一个问题.最新创建的div元素将保留在顶部，并且不能与任何以前创建的div重叠.关于如何堆叠div的任何建议或解决方案，但不限于/仅限于最新的div元素创建? JSFIDDLE

On a button click event a new div is created. Once a div is created it becomes draggable thanks to the help of the jqueryui draggable PLUGIN. I am running into an issue that occurs when I try to stack a div on top of another. The latest created div element will stay on top and can’t be overlapped by any previously created div. Any suggestions or solutions of how I can stack divs not barred/limited to the latest div element creation? JSFIDDLE

jQuery

$('#button').click(function (e) {
    /** Make div draggable **/
    $('<div />', {
        class: 'draggable ui-widget-content',
        text: $('textarea').val(),
        appendTo: '.middle-side',
        draggable: {
            containment: 'parent'
        }
    }).addClass('placement');


    /** Contain draggable div **/
    $('.middle-side').parent().mousemove(function(e){
        var offset = $(this).offset();
        var relX = e.pageX - offset.left;
        var relY = e.pageY - offset.top;
        $('.placement').css({'top': relY + 30,'left': relX + 10, 'position': 'absolute'});
    })

});

/** Place a temporary dashed border on div after initial creation**/
$('.middle-side').on('click', function(e){
    var offset = $(this).offset();
    var relX = e.pageX - offset.left;
    var relY = e.pageY - offset.top;
    $('.placement').css({'top': relY,'left': relX, 'position': 'absolute' });
    $(this).off("mousemove").find('.placement').removeClass('placement')    
}); 

HTML

<textarea rows="4" cols="50" placeholder="Enter Text Here!"></textarea>
<br/>
<input type="button" id="button" value="Add Div with Text" />
<br/>
<div>
    <div class="middle-side empty"></div>
</div>

推荐答案

与其他图层相比，可拖动图层的z-index保留更多. 首先在CSS中的.draggable元素中添加position和z-index属性:

You should keep z-index of draggable layer more than the others one. First add position and z-index properties to your .draggable elements in CSS:

.draggable {
    width: 150px;
    height: 150px;
    padding: 0.5em;
    background:#FFFFDD;
    position: relative;
    z-index: 1;
}

在您的JS中:

// the counter
var z = 1;

$('<div />', {
    class: 'draggable ui-widget-content',
    text: $('textarea').val(),
    appendTo: '.middle-side',
    draggable: {
        containment: 'parent',

        // whenever the drag start
        start: function( event, ui ) {
            // set the z-index one more
            $(this).css('z-index', ++z);
        }
    }
}).addClass('placement');

jsFiddle演示 .

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