JS implements dragging the progress bar to change the transparency of elements

What I want to share today is to use native JS to drag the progress bar to change the transparency of the element. The effect is as follows:

The following is the code implementation, you are welcome to copy and paste.

<!DOCTYPE html>
<html>
 
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Native JS drag progress bar to change element transparency</title>
    <style>
        #parent {
            width: 400px;
            height: 20px;
            background: #CCC;
            position: relative;
            margin: 20px auto;
        }
 
        #div1 {
            width: 20px;
            height: 20px;
            background: red;
            cursor: pointer;
            position: absolute;
        }
 
        #div2 {
            width: 300px;
            height: 300px;
            margin: 0 auto;
            filter:alpha(opacity:0);
            opacity: 0;
            background: yellow;
        }
    </style>
 
    <script>
        window.onload = function () {
 
            var oDiv = document.getElementById('div1');
            var oParent = document.getElementById('parent');
            var oDiv2 = document.getElementById('div2');
 
            oDiv.onmousedown = function (ev) {
 
                var oEvent = ev || event;
                //Calculate the mouse position relative to the slider var disX = oEvent.clientX - oDiv.offsetLeft;
 
                document.onmousemove = function (ev) {
 
                    var oEvent = ev || event;
                    //Calculate the dynamic left value of the slider var l = oEvent.clientX - disX;
 
                    //Limit the drag range if (l < 0) {
 
                        l = 0;
 
                    } else if (l > oParent.offsetWidth - oDiv.offsetWidth) {
 
                        l = oParent.offsetWidth - oDiv.offsetWidth;
                    }
 
                    oDiv.style.left = l + 'px';
 
                    //Calculate the ratio of the drag moving distance to the total draggable range var scale = l / (oParent.offsetWidth - oDiv.offsetWidth);
 
                    //Let Div2 gradually show and hide as the mouse is dragged oDiv2.style.filter = 'alpha(opacity:' + 100 * scale + ')';
                    oDiv2.style.opacity = scale;
 
                };
 
                document.onmouseup = function () {
 
                    document.onmousemove = null;
                    document.onmouseup = null;
                };
            };
        };
    </script>
</head>
 
<body>
    <div id="parent">
        <div id="div1"></div>
    </div>
    <div id="div2"></div>
</body>
 
</html>

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.

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