JavaScript 滑动验证

淡淡的烟草味﹌ 2022-07-12 07:51 204阅读 0赞

<!DOCTYPE html>
    <html>
    <head>
        <meta charset="utf-8">
        
        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
        <style>
            /* 滑动控件容器,亮灰色背景 */
            #dragContainer {
                position: relative;
                display: inline-block;
                background: #e8e8e8;
                width: 300px;
                height: 40px;
                border: 2px solid #e8e8e8;
    			/** 下面两行用来让控件整体水平居中（不需要可删）*/
    			left: 50%;
    			transform: translate(-50%);
            }
            /* 滑块左边部分,绿色背景 */
            #dragBg {
                position: absolute;
                background-color: #7ac23c;
                width: 0px;
                height: 100%;
            }
            /* 滑动验证容器文本 */
            #dragText {
                width: 100%;
                height: 100%;
    			/** absolute是为了让它不占地方 */
    			position: absolute;
    			/** flex布局可以让它居中 */
    			display: flex;
    			align-items:center;
    			justify-content: center;
                /* 文本不允许选中 */
                user-select: none;
                -webkit-user-select: none;
            }
            /* 滑块 */
            #dragHandler {
                position: absolute;
                width: 50px;
                height: 100%;
                cursor: move;
            }
            /* 滑块初始背景 */
            .dragHandlerBg {
                background: #fff no-repeat center url("data:image/png;base64,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");
            }
            /* 验证成功时的滑块背景 */
            .dragHandlerOkBg {
                background: #fff no-repeat center url("data:image/png;base64,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");
            }
        </style>
        <script>
            window.onload = function() {
                var dragContainer = document.getElementById("dragContainer");
                var dragBg = document.getElementById("dragBg");
                var dragText = document.getElementById("dragText");
                var dragHandler = document.getElementById("dragHandler");
    
                //滑块最大偏移量
                var maxHandlerOffset = dragContainer.clientWidth - dragHandler.clientWidth;
                //是否验证成功的标记
                var isVertifySucc = false;
                initDrag();
    
                function initDrag() {
                    dragText.textContent = "拖动滑块验证";
                    dragHandler.addEventListener("mousedown", onDragHandlerMouseDown);
    
                    dragHandler.addEventListener("touchstart", onDragHandlerMouseDown);
                }
    
                function onDragHandlerMouseDown(event) {
                    document.addEventListener("mousemove", onDragHandlerMouseMove);
                    document.addEventListener("mouseup", onDragHandlerMouseUp);
    
                    document.addEventListener("touchmove", onDragHandlerMouseMove);
                    document.addEventListener("touchend", onDragHandlerMouseUp);
                }
    
                function onDragHandlerMouseMove(event) {
                    /*
                    html元素不存在width属性,只有clientWidth
                    offsetX是相对当前元素的,clientX和pageX是相对其父元素的
    
                    touches：表示当前跟踪的触摸操作的touch对象的数组。
                    targetTouches：特定于事件目标的Touch对象的数组。
                　　changedTouches：表示自上次触摸以来发生了什么改变的Touch对象的数组。
                    */
    				
    				//特别注意：由于translate(-50%)，所以实际的left比属性中的offsetLeft要左50%
                    var left = (event.clientX || event.changedTouches[0].clientX) - dragHandler.clientWidth / 2 - dragContainer.offsetLeft + dragContainer.clientWidth / 2;
    				console.log(event.clientX, dragContainer.offsetLeft);
    				console.log(event)
                    if(left < 0) {
                        left = 0;
                    } else if(left > maxHandlerOffset) {
                        left = maxHandlerOffset;
                        verifySucc();
                    }
                    dragHandler.style.left = left + "px";
                    dragBg.style.width = dragHandler.style.left;
                }
                function onDragHandlerMouseUp(event) {
                    document.removeEventListener("mousemove", onDragHandlerMouseMove);
                    document.removeEventListener("mouseup", onDragHandlerMouseUp);
    
                    document.removeEventListener("touchmove", onDragHandlerMouseMove);
                    document.removeEventListener("touchend", onDragHandlerMouseUp);
    
                    dragHandler.style.left = 0;
                    dragBg.style.width = 0;
                }
    
                //验证成功
                function verifySucc() {
                    isVertifySucc = true;
                    dragText.textContent = "验证通过";
                    dragText.style.color = "white";
                    dragHandler.setAttribute("class", "dragHandlerOkBg");
    
                    dragHandler.removeEventListener("mousedown", onDragHandlerMouseDown);
                    document.removeEventListener("mousemove", onDragHandlerMouseMove);
                    document.removeEventListener("mouseup", onDragHandlerMouseUp);
    
                    dragHandler.removeEventListener("touchstart", onDragHandlerMouseDown);
                    document.removeEventListener("touchmove", onDragHandlerMouseMove);
                    document.removeEventListener("touchend", onDragHandlerMouseUp);
                };
            }
        </script>
    </head>
    <body>
        <div id="dragContainer">
            <div id="dragBg"></div>
            <div id="dragText"></div>
            <div id="dragHandler" class="dragHandlerBg"></div>
        </div>
    </body>
    </html>

![这里写图片描述][aHR0cDovL2ltZy5ibG9nLmNzZG4ubmV0LzIwMTcwMjE2MjM0MTA3NDA4]  
![这里写图片描述][aHR0cDovL2ltZy5ibG9nLmNzZG4ubmV0LzIwMTcwMjE2MjM0MTIyNjE0]

[aHR0cDovL2ltZy5ibG9nLmNzZG4ubmV0LzIwMTcwMjE2MjM0MTA3NDA4]: /images/20220711/048fa89d4b6b464dbeef135088473c13.png
[aHR0cDovL2ltZy5ibG9nLmNzZG4ubmV0LzIwMTcwMjE2MjM0MTIyNjE0]: /images/20220711/32ab1287c0e34b42ad2d50868eccc959.png