JS implements MUI navigation bar transparent gradient effect-JS Tutorial-php.cn

mui has a built-in H5 version of the transparent gradient navigation control. For tutorials, please refer to the mui official website; transparent gradient navigation is a workaround to solve the problem of scroll bars reaching the top. Compared with dual webviews, it has higher performance and better animation effects. ;

The following article will share with you how to implement the transparent gradient effect of the MUI navigation bar based on native JS. The specific content details are as follows:

First of all, declare: Since the value of backgroundColor is RGBA is not supported by IE8 and below, so this effect does not support IE8 and below browsers

css code

body,p,h1{margin: 0;} .module-layer{ width: 100%; position: fixed; top: 0; left: 0; z-index: 100000; } .module-layer-content{ position: relative; min-width: 320px; max-width: 750px; width: 100%; margin: 0 auto; background-color: rgba(255, 0, 0, 0.9); } .module-layer-bg{ width: 100%; height: 100%; background: #000; opacity: .7; position: absolute; top: 0; left: 0; z-index: -1; } .layer-head-name{ height: 50px; line-height: 50px; text-align: center; padding: 0 50px; font-size: 20px; } .layer-return,.layer-share{ width: 50px; height: 50px; line-height: 50px; text-align: center; position: absolute; top:0; z-index: 1; } .layer-return{left: 0;} .layer-share{right: 0;} .fixed-layer{ height: 100%; display: none; z-index: 100001; } .relative-layer{height: 100%;} .layer-content{ padding:3%; position: relative; top: 20%; } .layer-close{ width: 2rem; height: 2rem; position: absolute; top:3%; right: 3%; } .pr { position:relative; } #shop-input::-webkit-input-placeholder { color:#fff; } #shop-input:-moz-placeholder { color:#fff; } #shop-input::-moz-placeholder { color:#fff; } #shop-input:-ms-input-placeholder { color:#fff; } #shop-input { border:none; outline:none; background:transparent; } .search-box { height:30px; border-radius:20px; top:10px; overflow:hidden; z-index:10; } .search-box:after { content:''; display:block; width:100%; height:30px; background:#fff; opacity:.5; position:absolute; top:0; left:0px; z-index:-1; } #shop-input { height:28px; line-height:28px; font-size:16px; position:absolute; top:0; left:30px; } .shop-search { width:16px; height:16px; position:absolute; top:7px; left:6px; } .layer-return{ background: url(images/return.png) no-repeat center center/12px 20px; } .layer-share{ background: url(images/share.png) no-repeat center center/20px 30px; } a { -webkit-tap-highlight-color: transparent; -webkit-touch-callout: none; -webkit-user-select: none; } .module-content{ min-width: 320px; max-width: 750px; width: 100%; margin: 0 auto; background: #fff; } .module-content p:first-child img{margin-top: 0;} .module-content p img{ display: block; width: 100%; margin-top: 10px; }

Copy after login

HTML code

Copy after login

JS code

(function(){ //获取滚动条当前位置 function getScrollTop(){ 　　var scrollTop = 0, bodyScrollTop = 0, documentScrollTop = 0; 　　if(document.body){ 　　　　bodyScrollTop = document.body.scrollTop; 　　} 　　if(document.documentElement){ 　　　　documentScrollTop = document.documentElement.scrollTop; 　　} 　　scrollTop = (bodyScrollTop - documentScrollTop > 0) ? bodyScrollTop : documentScrollTop; 　　return scrollTop; } //获取CSS样式 function getStyle(element, attr){ if(element.currentStyle){ return element.currentStyle[attr]; }else{ return window.getComputedStyle(element,null)[attr]; } } //获取原始backgroundColor值 var color = getStyle(document.getElementsByClassName('module-layer-content')[0],'backgroundColor'); //取到RGB var colorRgb = color.substring(0,color.lastIndexOf(',') + 1); //取到A var colorA = color.substring(color.lastIndexOf(',') + 1,color.length - 1); //对A判断，如果最终值小于0.9，直接设置为1 if(colorA < 0.9){colorA = 1;} //设置背景色的A的函数 var setCoverOpacity = function() { document.getElementsByClassName('module-layer-content')[0].style.background = colorRgb + (((getScrollTop() / 550) > colorA) ? colorA : (getScrollTop() / 550)) + ')'; } //初始化函数 setCoverOpacity(); //绑定滚动监听事件 window.addEventListener('scroll',setCoverOpacity,false); }())

Copy after login

Note:

is not compatible with IE browsers IE8 and below;

550 is the final transparency of the scroll bar’s position, which can be customized as needed;

CSS The A of the RGBA of the final background color is the final transparency

Related recommendations:

Sample code for JavaScript to achieve a beautiful personalized navigation bar somersault cloud effect

How to realize the navigation bar link jumps after clicking, and adds color to the corresponding link on the new page

Introduction to the implementation method of making a three-dimensional navigation bar using CSS

The above is the detailed content of JS implements MUI navigation bar transparent gradient effect. For more information, please follow other related articles on the PHP Chinese website!