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How to prevent the mouse from moving outside the body in javascript

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Release： 2023-04-24 16:09:36

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How to prevent the mouse from moving outside the body javascript

With the rapid development of the Internet, the design of web pages is becoming more and more complex. In order to provide users with a good experience, we often need to do some details Optimization, such as when the mouse moves outside the page, the mouse cannot exceed the scope of the page, which is very necessary in some application scenarios. The way to achieve this effect is through JavaScript. In this article, we will discuss how to use JavaScript to prevent the mouse from moving outside the body.

In order to achieve this effect, we need to use some JavaScript events and methods. First, we need to use the onmousemove event to monitor the movement of the mouse on the page, and then use the clientX and clientY methods to obtain the coordinates of the mouse on the page. Next, we need to use the offsetWidth and offsetHeight methods to get the width and height of the page, so that we can calculate whether the mouse is beyond the scope of the page. If it is, we need Set the mouse coordinates to be at the edge of the page.

The following is a sample code that shows how to use JavaScript to achieve the effect of prohibiting the mouse from moving outside the body:

<body onmousemove="checkCursor(event)">
    <div>
        <p>Some content here.</p>
    </div>
    <script>
        function checkCursor(e) {
            e = e || window.event;
            var body = document.body;
            var x = e.clientX;
            var y = e.clientY;
            var width = body.offsetWidth;
            var height = body.offsetHeight;
 
            if (x < 0) {
                x = 0;
            } else if (x > width) {
                x = width;
            }
 
            if (y < 0) {
                y = 0;
            } else if (y > height) {
                y = height;
            }
 
            body.style.cursor = 'crosshair';
            body.style.cursor = 'none';
            console.log(x, y);
        }
    </script>
</body>

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In the above code, we use onmousemoveEvent to monitor the movement of the mouse, and calculate the coordinates of the mouse in the checkCursor function. If the mouse exceeds the scope of the page, we set the coordinates of the mouse to the edge of the page, and set the mouse pointer to none by modifying the CSS style of the body element, so The user cannot move outside the page.

To sum up, it is very necessary to prohibit the mouse from moving outside the body, especially in some highly interactive application scenarios. By using JavaScript, we can easily achieve this effect. Of course, how to implement it still needs to be adjusted and optimized according to the actual situation to achieve a better user experience.

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