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This article will explain in detail how to use JavaScript to achieve slider verification function. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

The details are as follows

Document * {margin: 0; padding: 0;} .box {position: relative; width: 500px; height: 40px; border: 1px solid # 000;} p {position: relative; z-index: 5 Font: 20px/40px 'ccc; box-sizing'; text-align: center; color: rgba (95, 90, 90, 0.479);} .btn {width: 40px; height: 40px; border: 1px solid # ccc; box-sizing: border-box; background-color: # fff Cursor: pointer; z-index: 6; position: absolute; top: 0; left: 0; background-position: center; background-repeat: no-repeat; background-size: 50% auto; background-image: url (. / figure 1.png) } .bg {height: 100%; position: absolute; top: 0; left: 0; background-color: # 7ac23c;}

Drag the slider to verify

/ / get the event var box = document.querySelector ('.box') var p = document.querySelector ('p') var btn = document.querySelector ('.btn') var bg = document.querySelector ('.bg') / / the event this.box.onselectstart = function () {return false / / prevent default behavior} / / does not validate successfully by default var flag = false / / Press event btn.onmousedown = function () {var E1 = window.event; var x1 = e1.offsetX; / / move event btn.onmousemove = function () {var e2 = window.event Var x2 = e2.clientX / / calculate the value of left var left = x2-x1 if (left > 0) {/ / set the distance of the slider this.style.left = left + 'px'; / / set the width of the background bg.style.width = left +' px' If (left > box.offsetWidth-this.offsetWidth) {/ / verify success flag = true; p.innerText = 'pass verification' p.style.color ='# 000' / / event clear this.onmousedown = null This.onmousemove = null;} / / Mouse release btn.onmouseup = function () {/ / event clear this.onmousemove = null / / determine whether the verification is successful if (flag) {return} this.style.left = 0; / / set the distance of the slider bg.style.width = 0; / / set the width of the background};}

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