JS限制文本框输入金额并保留两位小数-蒲公英云

JS限制文本框输入金额并保留两位小数

怼烎@ 2022-07-14 14:58 307阅读 0赞

直接上代码

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>JS限制文本框输入金额并保留两位小数</title>
<script type="text/javascript">
/**
* 实时动态强制更改用户录入
* arg1 inputObject
**/
function amount(th){
    var regStrs = [
        ['^0(\\d+)$', '$1'], //禁止录入整数部分两位以上，但首位为0
        ['[^\\d\\.]+$', ''], //禁止录入任何非数字和点
        ['\\.(\\d?)\\.+', '.$1'], //禁止录入两个以上的点
        ['^(\\d+\\.\\d{2}).+', '$1'] //禁止录入小数点后两位以上
    ];
    for(var i=0; i<regStrs.length; i++){
        var reg = new RegExp(regStrs[i][0]);
        th.value = th.value.replace(reg, regStrs[i][1]);
    }
}
/**
* 录入完成后，输入模式失去焦点后对录入进行判断并强制更改，并对小数点进行0补全
* arg1 inputObject
**/
function overFormat(th){
    var v = th.value;
    if(v === ''){
        v = '0.00';
    }else if(v === '0'){
        v = '0.00';
    }else if(v === '0.'){
        v = '0.00';
    }else if(/^0+\d+\.?\d*.*$/.test(v)){
        v = v.replace(/^0+(\d+\.?\d*).*$/, '$1');
        v = inp.getRightPriceFormat(v).val;
    }else if(/^0\.\d$/.test(v)){
        v = v + '0';
    }else if(!/^\d+\.\d{2}$/.test(v)){
        if(/^\d+\.\d{2}.+/.test(v)){
            v = v.replace(/^(\d+\.\d{2}).*$/, '$1');
        }else if(/^\d+$/.test(v)){
            v = v + '.00';
        }else if(/^\d+\.$/.test(v)){
            v = v + '00';
        }else if(/^\d+\.\d$/.test(v)){
            v = v + '0';
        }else if(/^[^\d]+\d+\.?\d*$/.test(v)){
            v = v.replace(/^[^\d]+(\d+\.?\d*)$/, '$1');
        }else if(/\d+/.test(v)){
            v = v.replace(/^[^\d]*(\d+\.?\d*).*$/, '$1');
            ty = false;
        }else if(/^0+\d+\.?\d*$/.test(v)){
            v = v.replace(/^0+(\d+\.?\d*)$/, '$1');
            ty = false;
        }else{
            v = '0.00';
        }
    }
    th.value = v; 
}
</script>
</head>
<body>
<input type="text" name="city" value="" onKeyUp="amount(this)" onBlur="overFormat(this)" />
</body>
</html>