手机号4位显示空格,银行卡每4位显示空格

前端开发 2017-03-23

开发有时候会遇到输入手机号和银行卡号,按照每4位显示一个空格的需求,方便用户阅读,如果是纯展示,就很容易实现,如果是一边输入一边展示则有点难度

有人用两个input实现,一个负责输入数据,但是透明看不见,另外一个展示在界面上,变相的解决了这个需求(手机上可调用数字键盘)

本次取巧写个demo,只用一个input用定时器不断的查询输入的字符来判断输入的数据(无法直接调用数字键盘,因为里边有空格)

如果是银行卡号,将字符判断长度更改为,也可以根据实际需求来判断长度

lastLen === 5 || lastLen === 10 || lastLen === 15|| lastLen === 20

话不多说,上代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="renderer" content="webkit">
    <title>Title</title>
</head>
<body>
<input type="text" id="telphone"><span id="err">
<script>
    var telphone = document.getElementById('telphone');
    var err = document.getElementById('err');
    //定义两个缓存值
    var firstLen = 0;
    var lastLen = 0;
    var re=/^1(3|4|5|7|8)\d{9}$/;
    telphone.oninput = function () {
        telphone.value = telphone.value.substr(0, 13);//只允许输入11位+2个空格
        //用户输入满11位开始验证
        if(telphone.value.length==13){
            //将数据去掉空格后验证
            if(!re.test(telphone.value.replace(/\s/g, ''))){
                err.innerHTML='手机号码有误'
            } else{
                err.innerHTML=''
            }
        }else{
            err.innerHTML=''
        }

    }
    telphone.onfocus = function () {
        timer = setInterval(function () {
            lastLen = telphone.value.length;
            if (lastLen > firstLen) {
                firstLen = telphone.value.length;
                if (lastLen === 4 || lastLen === 9) {
                    var temp1 = telphone.value.substr(0, telphone.value.length - 1);
                    var temp2 = telphone.value.substr(telphone.value.length - 1);
                    telphone.value = temp1 + ' ' + temp2;
                }
            } else if (lastLen <= firstLen) {
                if (lastLen === 4 || lastLen === 9) {
                    telphone.value = telphone.value.substr(0, telphone.value.length - 1);
                }
                firstLen = telphone.value.length;
            }
        }, 10);//如果手机出现卡顿,可适当把定时器时间加大
    }
</script>
</body>
</html>

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