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How to use JavaScript bubbling events to achieve multi-level interaction: build complex interactive experiences

王林Original: 2024-02-21 10:51:03978browse

How to use JavaScript bubbling events to achieve multi-level interaction: building complex interactive experiences requires specific code examples

In modern web applications, interactive experience is a very Important factor. In order to achieve complex interactive effects, we need to use JavaScript to handle various user events. Among them, the use of bubbling events can effectively achieve multi-level interaction, allowing page elements to communicate and respond to each other.

Bubbling event refers to the process in which an event is propagated upward from the triggered element to the top-level document node in the DOM tree. When an element triggers an event, such as a click event, if the event handler is bound to the element, the function will be executed; at the same time, the event will continue to be passed to the parent element to check again whether there is The element to which this event handler function is bound is executed, if any. This process will continue to the root node until all elements have been checked.

The following is a specific example showing how to use bubbling events to achieve multi-level interaction:

<!DOCTYPE html>
<html>
<head>
    <title>多层级交互示例</title>
    <style>
        .box {
            width: 300px;
            height: 200px;
            background-color: #e1e1e1;
            padding: 20px;
            margin: 20px;
            text-align: center;
        }
    </style>
</head>
<body>
    <div class="box" id="box1">
        <div class="box" id="box2">
            <div class="box" id="box3">
                <button id="btn">点击我</button>
            </div>
        </div>
    </div>

    <script>
        // 获取按钮元素
        var btn = document.getElementById('btn');

        // 给按钮绑定click事件处理函数
        btn.addEventListener('click', function(event) {
            // 阻止事件冒泡，即禁止事件向父级元素传递
            event.stopPropagation();
            // 执行按钮点击后的操作
            alert('按钮被点击了！');
        });

        // 获取所有的.box元素
        var boxes = document.getElementsByClassName('box');

        // 遍历所有的.box元素，给它们绑定click事件处理函数
        Array.from(boxes).forEach(function(box) {
            box.addEventListener('click', function() {
                // 获取被点击的.box元素的id
                var boxId = this.id;
                // 执行对应的操作
                alert('我是' + boxId);
            });
        });
    </script>
</body>
</html>

In the above code, we created three div elements with the same class, which are nested within each other. Each div element has an id, which makes it easier for us to distinguish them in the event handler function. At the same time, we have a button element nested in the innermost div element.

We first bind a click event handler to the button element. In this function, we call the stopPropagation() method of the event object to prevent the event from bubbling. The purpose of this is that when the button is clicked, only the click event handler of the button will be executed, and the click event handler of the parent element will not be executed.

Next, we use the addEventListener method to bind a click event handler to all elements with the .box class name. In this function, we first obtain the id of the clicked element and perform different operations based on the id. In this example, we simply pop up a dialog box showing the id of the clicked element.

In this way, we can achieve multi-level interactive effects. When the user clicks a button, only the click event handler of the button will be triggered; when the user clicks on an element other than the button, the click event handler of the corresponding element and its parent element will be triggered, thus achieving multi-level interaction. .

Therefore, using JavaScript bubbling events can easily build complex interactive experiences. By controlling the bubbling of events and preventing them from bubbling, we can flexibly handle user operations to achieve rich and diverse interactive effects. I hope the sample code provided in this article can help readers better understand and apply bubbling events.

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