在可拖动元素上设置 z-index [英] Setting z-index on draggable elements

问题描述

我正在尝试使用 jQuery 在可拖动元素上设置 z-index.你可以在这里看到我在说什么以及我目前所拥有的:

I am trying to set the z-index on draggable elements using jQuery. You can see what I am talking about and what I have so far here:

http://jsfiddle.net/sushik/LQ4JT/1/

它非常原始并且存在问题.关于如何使最后点击的元素具有最高 z-index 而不是将所有其余元素重置为基本 z-index 的任何想法，让它们一步，所以倒数第二个点击有第二高的z-index，等等.

It is very primitive and there are problems with it. Any ideas on how I would make the last clicked element have the highest z-index and rather than resetting all of the rest to a base z-index, have them step, so the 2nd to last clicked has the second highest z-index, etc..

我遇到的另一个问题是它仅适用于完全单击事件，但可拖动功能通过单击并按住来起作用.我怎么能在初始点击时应用该类而不等待释放点击的事件?

Another problem I am having with it is that it only works on a full click event but the draggable functionality works by clicking and holding down. How could I have the class applied on that initial click down and not wait for the event of releasing the click?

推荐答案

我已经更新了您的 CSS 和 Javascript.除非你非常绝望，否则不要在 css 中使用!important".

I have updated your CSS and Javascript. Don't use "!important" in css unless you are that much desperate.

http://jsfiddle.net/LQ4JT/7/

    $(document).ready(function() {
        var a = 3;
        $('#box1,#box2,#box3,#box4').draggable({
            start: function(event, ui) { $(this).css("z-index", a++); }
        });
    $('#dragZone div').click(function() {
        $(this).addClass('top').removeClass('bottom');
        $(this).siblings().removeClass('top').addClass('bottom');
        $(this).css("z-index", a++);
    });

});

虽然这个答案有效，但在 javascript 中它有最大数量 2^31−1 的限制.参考 什么是一个数字可以在不损失精度的情况下达到的 JavaScript 的最高整数值吗? 了解更多信息.

Though this answer works it has the limitation of max number of 2^31−1 in javascript. refer What is JavaScript's highest integer value that a Number can go to without losing precision? for more info.

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