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HTML, CSS and jQuery: Make a multi-select dropdown menu with checkboxes

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Release： 2023-10-27 14:22:59

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HTML, CSS and jQuery: Make a multi-select dropdown menu with checkboxes

HTML, CSS and jQuery: Making a multi-select drop-down menu with checkboxes

With the continuous development of the Internet, web design and interactive experience have become more and more important. In the past, using mouse clicks to make selections was a common interaction method. However, with the diversification of user needs, we need more flexible and intelligent interaction methods. This article will introduce how to use HTML, CSS and jQuery to make a multi-select drop-down menu with checkboxes.

First, we need to create a basic HTML structure, containing a select box and several options. The code is as follows:

<!DOCTYPE html>
<html>
<head>
    <title>多选下拉菜单</title>
    <link rel="stylesheet" type="text/css" href="style.css">
    <script src="jquery.js"></script>
    <script src="script.js"></script>
</head>
<body>
    <div class="dropdown">
        <button class="dropbtn">选择项</button>
        <div class="dropdown-content">
            <input type="checkbox" id="item1" name="item1" value="item1">
            <label for="item1">选项1</label><br>
            <input type="checkbox" id="item2" name="item2" value="item2">
            <label for="item2">选项2</label><br>
            <input type="checkbox" id="item3" name="item3" value="item3">
            <label for="item3">选项3</label><br>
        </div>
    </div>
</body>
</html>

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Next, we need to use CSS to beautify the drop-down menu. Add the following code in the style.css file:

/* 隐藏下拉菜单 */
.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
}

/* 隐藏复选框 */
.dropdown-content input[type="checkbox"] {
    display: none;
}

/* 样式化下拉菜单按钮 */
.dropbtn {
    background-color: #4CAF50;
    color: white;
    padding: 10px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}

/* 鼠标移动到下拉菜单上时显示选项 */
.dropdown:hover .dropdown-content {
    display: block;
}

/* 选中选项时改变背景颜色 */
.dropdown-content input[type="checkbox"]:checked + label {
    background-color: #ccc;
}

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In the above code, we have used some basic CSS styles to hide and show the drop-down menu, as well as change the background color of the selected option.

Now, we need to use jQuery to implement the interactive behavior of the drop-down menu. Add the following code to the script.js file:

$(document).ready(function() {
    // 点击按钮时显示或隐藏下拉菜单
    $(".dropbtn").click(function() {
        $(".dropdown-content").toggle();
    });

    // 当有选项被选中或取消选中时，更新按钮文本
    $(".dropdown-content input[type='checkbox']").change(function() {
        var selectedItems = [];
        $(".dropdown-content input[type='checkbox']:checked").each(function() {
            selectedItems.push($(this).next("label").text());
        });
        var buttonText = selectedItems.join(", ");
        if(buttonText === "") {
            buttonText = "选择项";
        }
        $(".dropbtn").text(buttonText);
    });
});

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In this JavaScript code, we use jQuery’s toggle() method to toggle the display and hiding of the drop-down menu. At the same time, we also listen to the change event of the check box. When the option is selected or unchecked, the text content on the button will be automatically updated.

Finally, we need to download and introduce the jQuery library and save the above three files in the same folder.

By combining the above HTML, CSS and jQuery, we can easily make a multi-select drop-down menu with checkboxes. Such a drop-down menu will provide users with a more flexible and convenient selection experience and improve the interactivity of the web page.

Summary: Through the combination of HTML, CSS and jQuery, we can easily create a variety of highly interactive web page elements. One example of this is a multi-select drop-down menu that provides a more flexible and intelligent way to select. I hope the sample code in this article can be helpful to you and help you achieve a better interactive experience in web design.

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