개발하자/자바스크립트
trim() (공백이면 false 리턴)
i구야
2015. 2. 13. 11:40
<html>
<head>
<script>
function f1(){
if(! t1.value.trim()){
alert("공백입력하면 안됨~!");
t1.focus();
}else if(! t2.value.trim()){
alert("공백입력하면 안됨~!");
t2.focus();
}else{
alert("계산하기");
}
}
</script>
</head>
<body>
<input type="text" id="t1">
<input type="text" id="t2">
<input type="button" value="덧셈" onclick="f1()">
<input type="text" id="t3">
</body>
</html>