jquery sets scroll bar based on idv height-Front-end Q&A-php.cn

jquery sets scroll bar based on idv height

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Release： 2023-05-28 12:03:08

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In daily front-end development, we often encounter situations where we need to set the scroll bar according to the height of the element. For example, when we develop a web page, we need to set the scroll bar height of a certain div element in the page to the height of the visible area of the current window in order to better display the content. So how to use jQuery to achieve this? The detailed steps will be introduced below.

First of all, before implementing adaptive scroll bar height, you need to ensure that you have introduced the jQuery library. If you haven't used jQuery yet, you can download it from jQuery's official website (http://jquery.com/).

Next, we will use the following HTML code to demonstrate how to set the scroll bar according to the height of the element:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>根据元素高度设置滚动条</title>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <style type="text/css">
        #content {
            height: 500px; /* 设置元素高度为500px */
            overflow: auto; /* 让元素出现自动滚动条 */
            background-color: #f5f5f5;
            padding: 20px;
        }
    </style>
</head>
<body>
    <div id="content">
        <p>这是一段文本。这是一段文本。这是一段文本。这是一段文本。这是一段文本。</p>
        <p>这是一段文本。这是一段文本。这是一段文本。这是一段文本。这是一段文本。</p>
        <p>这是一段文本。这是一段文本。这是一段文本。这是一段文本。这是一段文本。</p>
    </div>
</body>
</html>

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In the above code, we define a div with the id of "content" element and set its height to 500px. In order to make scroll bars appear on this element, we set its overflow property to auto. Next, we'll use jQuery to set the scrollbar height based on the height of that element.

We can use jQuery's ready() method to execute the code for scroll bar height adaptation after the page is loaded. The details are as follows:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>根据元素高度设置滚动条</title>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <style type="text/css">
        #content {
            height: 500px; /* 设置元素高度为500px */
            overflow: auto; /* 让元素出现自动滚动条 */
            background-color: #f5f5f5;
            padding: 20px;
        }
    </style>
    <script type="text/javascript">
        $(document).ready(function() {
            // 获取窗口可见区域高度
            var windowHeight = $(window).height();
            // 获取元素高度
            var contentHeight = $("#content").height();
            // 如果元素高度大于窗口可见区域高度，则设置滚动条高度为窗口可见区域高度
            if (contentHeight > windowHeight) {
                $("#content").css("height", windowHeight + "px");
            }
        });
    </script>
</head>
<body>
    <div id="content">
        <p>这是一段文本。这是一段文本。这是一段文本。这是一段文本。这是一段文本。</p>
        <p>这是一段文本。这是一段文本。这是一段文本。这是一段文本。这是一段文本。</p>
        <p>这是一段文本。这是一段文本。这是一段文本。这是一段文本。这是一段文本。</p>
    </div>
</body>
</html>

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In the above code, we use jQuery's ready() method to execute the code block, first get the height of the visible area of the window, then get the height of the element, and compare the two, if If the element height is greater than the window visible area height, set the element height to the window visible area height. We used jQuery's height() and css() methods to get and set the height of the element.

When the page is loaded, you will be able to see the adaptive scroll bar height, which will be adaptively adjusted according to your window size. In this way, you can ensure that the elements on the web page maximize the use of window space, display more content, and improve the user experience.

In summary, it is very simple to use jQuery to set the scroll bar height according to the height of the element. You only need to use jQuery's height() and css() methods. In daily front-end development, this technology is often used and is very practical.

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