<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Bootstrap 101 Template</title>
<!-- Bootstrap -->
<link href="http://cdn.bootcss.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet">
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="http://cdn.bootcss.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="http://cdn.bootcss.com/respond.js/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<div class="container">
<form class="form-horizontal" role="form">
<div class="form-group">
<label for="inputEmail3" class="col-sm-2 control-label">Email</label>
<div class="col-sm-10">
<input type="text" class="form-control input-sm" name="ip[]" placeholder="Email">
<input type="text" class="form-control input-sm" name="ip[]" placeholder="Email">
<input type="text" class="form-control input-sm" name="ip[]" placeholder="Email">
<input type="text" class="form-control input-sm" name="ip[]" placeholder="Email">
</div>
</div>
</form>
</div> <!-- /container -->
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="http://cdn.bootcss.com/jquery/1.11.2/jquery.min.js"></script>
<script>
$(function(){
var valid_number = function(num) {
if ( (num >= 48 && num <= 57) || (num >= 96 && num <= 105) ) {
return true;
}
else {
return false;
}
}
var input_number = function(num) {
if (num >= 48 && num <= 57) {
return num - 48;
}
else if(num >= 96 && num <= 105) {
return num - 96;
}
}
//键盘按下事件
$("[name='ip[]']").keydown(function(e){
console.log(e);
var val = $(this).val();
//如果键入不是数字并且不是.并且不是回车并且值不是空
if (!valid_number(e.keyCode) && e.keyCode != 190 && e.keyCode != 110 && e.keyCode != 8) {
return false;
}
// 如果键入退格
if (e.keyCode == 8 && $(this).val() == '') {
$(this).prev().focus();
return false;
}
//如果键入不是退格键，但3个数字 或者(键入.且值不为空)
if ((val.length == 3 || (e.keyCode == 190 || e.keyCode == 110) && val != '') && e.keyCode != 8) {
$(this).next().focus();
//如果是数字
if (valid_number(e.keyCode)) {
$(this).next().val(input_number(e.keyCode));
}
return false;
}
});
//键盘抬起事件
$("[name='ip[]']").keyup(function(e){
var val = $(this).val();
//排除非数字
val=val.replace(/[^d]/ig,'');
$(this).val(val);
//判断数字范围
if (val < 0 || val > 255){
$(this).val('');
return false;
}
});
});
</script>
</body>
</html>
效果图
输入.或者够3位合格数字，自动把当前键入值赋值给下一个文本框