<script type="text/javascript">
function valueCheck(){
valueText = document.getElementById('myText').value;
if(mailCheck(valueText)){
document.getElementById('myButton').disabled = true;
document.getElementById('result').innerHTML = "入力項目が正しくありません";
}else{
document.getElementById('myButton').disabled = false;
document.getElementById('result').innerHTML = "";
}
}
function mailCheck(str){
if (!str.match(/^[A-Za-z0-9]+[\w-]+@[\w\.-]+\.\w{2,}$/)) {
return true;
}else{
return false;
}
}
window.onload = function(){
document.getElementById('myText').onkeyup = valueCheck;
}
</script>
</head>
<body>
<div id="container">
<h3>メールアドレス</h3>
<input id="myText" type="text" maxlength="60" />
<input id="myButton" type="submit" value="送信" />
</div>
<div id="result"></div>