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How to set Z-Index using jQuery

Apr 06, 2023 am 08:54 AM

In front-end development, we often need to hierarchically set multiple elements in a web page to achieve a good page display effect. The Z-Index is an attribute that controls the element level. The higher it is, the higher the priority of the element and the closer it is to the front during the display process.

How to use jQuery to set Z-Index? Let's take a look at the specific implementation method.

First of all, we need to make it clear that in jQuery, the Z-Index property is named zIndex (note the case). The basic syntax is as follows:

$(selector).css("zIndex", value);

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Among them, selector is the selector of the target element, and value is the specified Z-Index value. It should be noted that the value here must be a number, otherwise it will not take effect.

In actual applications, you may encounter situations where the Z-Index of an element needs to be adjusted according to specific conditions. At this time, we can encapsulate the Z-Index attribute in a function for easy calling at any time. The following is a simple example:

function setZIndex(selector, value) {
    $(selector).css("zIndex", value);
}

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Next, let’s demonstrate a specific example. Suppose we need to implement a pop-up layer function. When an element is clicked, a higher-level floating box can pop up. The code is implemented as follows:

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;meta charset=&quot;utf-8&quot;&gt;
    &lt;title&gt;jQuery设置Z-Index&lt;/title&gt;
    &lt;style&gt;
        .pop-up {
            width: 200px;
            height: 150px;
            background-color: #fff;
            border: 1px solid #ccc;
            position: absolute;
            left: 50%;
            top: 50%;
            margin-left: -100px;
            margin-top: -75px;
            z-Index: -1;
            display: none;
        }

        .pop-up.show {
            z-Index: 999;
            display: block;
        }
    &lt;/style&gt;
    &lt;script src=&quot;https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js&quot;&gt;&lt;/script&gt;
    &lt;script&gt;
        $(function () {
            $("#pop-btn").on("click", function () {
                $(".pop-up").toggleClass("show");
            });
        });
    &lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;div style=&quot;text-align:center;&quot;&gt;
        &lt;button id=&quot;pop-btn&quot;&gt;点击弹出&lt;/button&gt;
    &lt;/div&gt;
    &lt;div class=&quot;pop-up&quot;&gt;
        这里是弹出层
    &lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;

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In this example, we define an element with the style .pop-up, whose initial Z-Index value is -1, indicating that it is in the page lower level. At the same time, we define another element with the style .pop-up.show, whose Z-Index value is 999, indicating that it is at a higher level in the page.

When the user clicks the button on the page, we use the toggleClass method in jQuery to switch the show style of the .pop-up element, Change its Z-Index value from -1 to 999, thus achieving the display effect of the pop-up layer.

To summarize, using jQuery to set Z-Index is basically to call the css method, set the attribute name to zIndex, and set the attribute value to a number. In practical applications, we can also encapsulate it as a function and call it flexibly according to actual needs to achieve more efficient and convenient operations.

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