使用jQuery悬停在div上时如何显示覆盖div? [英] How to show an overlay div when hover on a div with jQuery?

问题描述

我想在悬停的 div 上显示一个覆盖 div，类似于 IBM 网站上的这种效果:http://www.ibm.com/us/en/

I want to show an overlay div sitting on top of the hovered div similar to this effect on IBM website: http://www.ibm.com/us/en/

请查看页脚附近的 3 个方框.将鼠标悬停在让我们建设一个更智能的星球"框上查看效果.

Please look at the 3 boxes near the footer. Hover on the box "Let's build a smarter planet" to view the effect.

推荐答案

我创建了一个 工作示例.基本上，您需要创建 3 个具有可见和不可见容器的 div，添加 hover 事件处理程序并在该处理程序中切换 tooltip 的 可见性.

I've created a working example. Basically you need to create 3 divs with a visible and the invisible containers, add hover event handler and toggle the tooltip's visibility in that handler.

HTML:

<div class="parents">
    <div class="box type-1">box 1</div>
    <div class="tooltip type-1">tooltip 1</div>
</div>

<div class="parents">
    <div class="box type-2">box 2</div>
    <div class="tooltip type-2">tooltip 2</div>
</div>

<div class="parents">
    <div class="box type-3">box 3</div>
    <div class="tooltip type-3">tooltip 3</div>
</div>

CSS:

.parents
{
    float: left;
    margin: 5px;
}

.box,
.tooltip
{
    width: 80px;
    height: 30px;
    line-height: 30px;

    background-color: #666;
    color: #fff;
    border: 1px solid #222;
    text-align: center;
}

.tooltip
{
    display: none;
    position: absolute;
    top: 50px;
}

jQuery 代码:

$(document).ready
(
    function ()
    {
        // add hover event handler
        $('.box').hover
        (
            function ()
            {
                // find the triggering box parent, and it's tooltip child
                $(this).parent().children('.tooltip').animate
                (
                    {
                        opacity: "toggle",      // toggle opacity
                    }
                );
            }
        );
    }
);

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