JS原生评分组件
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>评分组件</title>
<link rel="stylesheet" href="css/reset.css">
<style>
/*外层底色星星*/
.star-rating{
background-image: url("img/bgimg.svg");
width: 480px;
height: 48px;
background-size: 48px;
cursor: pointer;
position: relative;
}
.star-rating[data-title]:hover::after{
content: attr(data-title);
position: absolute;
left: 0;
background-color: #eee;
padding: 5px 5px;
border-radius: 5px;
}
/*内层星星*/
.star-value{
background-image: url("img/cover.svg");
width: 50%;
height: 100%;
background-size: 48px;
}
</style>
</head>
<body>
<!--外层背景星星和内部覆盖星星-->
<div class="star-rating">
<div class="star-value"></div>
</div>
<div id="rater"></div>
</body>
<script src="js/index.js"></script>
<script>
rater({
element:document.getElementById("rater"),
max:10,
starSize:36,
showTip:true,
step:0.5,
rating:3
});
</script>
</html>
@charset "UTF-8";
body,div,dl,dt,dd,ul,li,pre,form,fieldset,select,input,textarea,button,p,img,iframe{ margin:; padding:; }
h1,h2,h3,h4,h5,h6{ font-weight:normal; margin:; padding:; }
body{ width: 100%; font-family: "Arial Narrow","SimSun","宋体"; background-color: #fff; -webkit-overflow-scrolling: touch;overflow-scrolling: touch; }
/* 重置button边框 */
button{ border: none; }
/* 去掉列表前的标识, li 会继承 */
ol,ul{list-style: none;}
/* 让链接默认不显示下划线*/
a{cursor: pointer;text-decoration: none;}
/* 清理浮动 */
.clearfix:before,.clearfix:after{ display: block; content: " "; clear: both; }
/* for ie67*/
.clearfix{zoom:;}
/* HTML5 媒体文件跟 img 保持一致 */
audio,canvas,video{ display: inline-block; *display: inline; *zoom:; }
address,caption,cite,code,dfn,em,th{ font-style: normal; font-weight: normal; }
.box-sizing{ -moz-box-sizing: border-box; -webkit-box-sizing: border-box; -o-box-sizing: border-box; -ms-box-sizing: border-box; box-sizing: border-box; }
/*p{ text-align:justify; text-justify:distribute;}*/
div, p, span { text-overflow: ellipsis; word-break: break-all; word-wrap: break-word; }
/*iphone及ipad下输入框默认内阴影*/
input, button { outline: none; -webkit-appearance: none; }
textarea { resize: none; outline: none; }
img { vertical-align: middle; border:; width: 100%; }
a:active, a:hover { outline:; }
/*ios和android下触摸元素时出现半透明灰色遮罩*/
a, input { border: none; outline: none; -webkit-tap-highlight-color: rgba(255, 255, 255, 0); }
input[type=button] { cursor: pointer; }
input[type=submit] { cursor: pointer; }reset.css
/*
定义函数 渲染评分组件
*/
function rater(options){
var showTip;
//options为传入的一个参数（为对象）
//判断options是否为一个对象
if(Object.prototype.toString.call(options)!=="[object Object]"){
throw new Error("需要一个字面量对象作为参数");
}
if(typeof options.element === "undefined" || options.element == null){
throw new Error("需要一个dom节点");
}
if(typeof options.showTip === "undefined"){
showTip=true;
}else {
showTip=options.showTip;
}
//console.log(showTip);
if(typeof options.step !== "undefined"){
if(options.step <= 0 || options.step > 1){
throw new Error("step必须是0-1的小数");
}
}
/*
参数：
element:dom 当前作用元素
max:当前最大星星数量
starSize:星星大小
showTip:布尔 true 显示title false 不显示
step:0-1 增长速度
rating:默认几个星星
*/
// 获取参数
var ele=options.element;
var max=options.max||5;
var starSize=options.starSize||48;
var step=options.step||1;
var currentStar;//当前星星数量
var rating;//设置当前记录值 用来判断点击后的记录纸
// Dom操作
ele.style.width=max*starSize+"px";
ele.classList.add("star-rating");
//ele.className += "star-rating";
ele.style.backgroundSize=starSize+"px";
ele.style.height=starSize+"px";
// 创建内部div节点 添加到当前节点中
var createDom=document.createElement("div");
createDom.classList.add("star-value");
createDom.style.backgroundSize=starSize+"px";
// 默认0%
if(!options.rating){
createDom.style.width="0%";
}else{
rating=options.rating;
createDom.style.width=(options.rating/max)*100+"%";
} ele.appendChild(createDom); //mousemove事件函数
function onStarIn(e){
var x=e.offsetX;//父级左边的距离
var eleWidth=ele.offsetWidth;//父级的宽度
var percent=x/eleWidth;//获取百分比
if(step===1){
currentStar=Math.ceil(percent*max);//当前星星数量
}else {
for (var i = step;;i+=step){
if(i>=percent*max){
currentStar=i;
break;
}
}
currentStar=parseFloat(currentStar.toPrecision(12));
}
// 渲染宽度
createDom.style.width=(currentStar/max)*100+"%";
//设置自定义属性
if(showTip){
ele.setAttribute("data-title",currentStar+"/"+max);
}
}
//mouseleave事件函数
function onStarOut(){
if(rating){
createDom.style.width=(rating/max)*100+"%";
}else{
createDom.style.width="0px";
}
}
//click 事件函数
function onStarClick(){
rating=currentStar;
createDom.style.width=(currentStar/max)*100+"%";
}
//绑定事件
ele.addEventListener("mousemove",onStarIn);
ele.addEventListener("mouseleave",onStarOut);
ele.addEventListener("click",onStarClick);
}
运行效果如下：
---星星为背景图片！
---偶尔听到一个课程讲解的，感觉会用到，就留下了。记录于此。