<html>
<head>
<script text/javascript>
var inputs = document.getElementsByTagName("input");
function checkTabPress(e)
{
for(var i=0;i<inputs.length;i++)
{
if((inputs[i].value === undefined || inputs[i].value.length == 0) && (e.keyCode == 9))
{
alert("plz write");
return false;
}
}
return true;
}
document.addEventListener('keyup', function (e) {
checkTabPress(e);
}, false);
</script>
</head>
<body>
Enter Your Name: <input onkeypress="checkTabPress('abc')" type='text' id="abc" placeholder=''><br>
Enter <input onkeypress="checkTabPress('xyz')" type='text' id="xyz" placeholder=''>
</body>
</html>
<html>
<head>
<script text/javascript>
var inpu
阅读背景：
当我尝试在按键事件上验证jsp表单时，在将任何数据输入到输入字段之前会出现警告框
来源：互联网
分享到：
