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div 模拟 select选择框

2018-06-24 01:51:07来源：未知阅读 ()

不太擅长总结，挺早的东西了，突然觉得都记录下来，小demo也比较简单，欢迎讨论指正。

之前 ui的设计稿选择框不想要默认样式，默认样式改起来也是太心塞，有的还改不了，所以干脆自己写了一个div模拟的选择框先看效果吧：

代码实现不多，也都很简单，js部分是纯原声的所以不需要引用其他框架就可以用：

先HTML部分：

<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <title>div模拟select选择框</title>
        <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
        <link href="css/customSelect.css" rel="stylesheet" />
        
    </head>

    <body>
        
        <div class="custom-select-box">
            <div class="select-box mui-inline" style="width: 220px;">
                <span id="fisrt" data-show="0">1</span>
                <ul class="custom-option-box">
                    <li class="active"><span>1</span></li>
                    <li><span>2</span></li>
                    <li><span>3</span></li>
                    <li><span>4</span></li>
                </ul>
            </div>
                            
        </div>
         
         
        <script src="js/customSelect.js"></script>
        
        
    </body>

</html>

css部分：

ul,li,div,span{
    box-sizing: border-box;
}
.select-box ul,
.select-box li {
    list-style-type: none;
    margin: 0;
    padding: 0;
    cursor: pointer;
    background: #fff;
}
.select-box {
    width: 100%;
    position: relative;
    background: #fff;
}
#fisrt {
    display: block;
    line-height: 40px;
    width: 100%;
    height: 40px;
    padding: 0 15px;
    padding-right: 20px;
    border: 1px solid #ccc;
    border-radius: 3px;
    /*white-space: nowrap;*/
    overflow: hidden;
    cursor: pointer;
}

#fisrt.active {
    border: 1px solid #F2C051;
}
#fisrt::after {
    content: "";
    display: block;
    position: absolute;
    top: 18px;
    right: 10px;
    width: 0;
    height: 0;
    border: 5px solid transparent;
    border-top-color: #000;
    background: #fff;
}

.custom-option-box {
    display: none;
    position: absolute;
    left: 0;
    top: 40px;
    background: #fff;
    border: 1px solid #ccc;
    border-top-color: transparent;
    z-index: 10000;
}
.custom-option-box li {
    display: block;
    line-height: 30px;
    padding: 0 15px;
    z-index: 10000;
}
.custom-option-box li:hover, 
.custom-option-box li.active {
    background: #F2C051;
}
.custom-option-box span {
    cursor: pointer;
}

js部分：（js部分有一点粗糙，现放上来，这两天会修改一下）

(function() {
    ready(function() {
        var option_box = document.getElementsByClassName("custom-option-box")[0],
            select_box = document.getElementsByClassName("select-box")[0],
            width;
        option_box.style.display = "none"; //初始ul隐藏  
        width = select_box.offsetWidth; //select的宽度 默认 100%  
        option_box.style.width = width + "px"; //初始ul宽度   
        
        document.getElementById("fisrt").addEventListener("click", function() {
            var isShow = this.dataset.show;
            if(isShow == 0) {
                this.dataset.show = 1;
                this.classList.add("active");
                this.nextElementSibling.style.display = "block"; //找到ul.son_ul显示  
            } else {
                this.dataset.show = 0;
                this.classList.remove("active");
                this.nextElementSibling.style.display = "none"; //找到ul.son_ul显示  
            }
        },false);
        var option = option_box.getElementsByTagName("li");
        for(var i = 0; i < option.length; i++){  
            option[i].onclick = function(){  
                var fisrt = this.parentNode.previousElementSibling;
                var siblings = getSiblings(this);
                fisrt.innerHTML = this.childNodes[0].innerText;
                fisrt.dataset.val = this.dataset.val;
                this.classList.add("active");
                for(var i = 0;i<siblings.length;i++){
                    siblings[i].classList.remove("active");
                }
                this.parentNode.style.display = "none";
                fisrt.dataset.show = 0;
                fisrt.classList.remove("active");
            }     
          } 
        
    });

    function ready (fn) {
        if(document.addEventListener){        //标准浏览器
            document.addEventListener('DOMContentLoaded',function(){
                //注销时间，避免重复触发
                document.removeEventListener('DOMContentLoaded',arguments.callee,false);
                fn();        //运行函数
            },false);
        }else if(document.attachEvent){        //IE浏览器
            document.attachEvent('onreadystatechange',function(){
                if(document.readyState=='complete'){
                    document.detachEvent('onreadystatechange',arguments.callee);
                    fn();        //函数运行
                }
            });
        }
    }
    function getSiblings (elm) {
        var a = [];
        var p = elm.parentNode.children;
        for(var i = 0, pl = p.length; i < pl; i++) {
            if(p[i] !== elm) a.push(p[i]);
        }
        return a;
    }
})();