<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>form form submission</title>
</head>
<body>
<form action="JS09.html" method="post" id="f">
<input type="text" id="a">
<input type="submit" value="提交" />
</form>
</body>
<script>
var f = document.getElementById('f');
//get the input box
var a = document.getElementById('a');
//Event listener for submit form
f.onsubmit = function (){
//Check if there is content
if(a.value==''){
alert('The content is empty, please fill in the user name');
// prevent form submission
return false;
}
else {
alert('Submission successful')
// the form can be submitted
return true;
}
}
</script>
</html>
Write form submission and judgment in JS
Guess you like
Origin http://43.154.161.224:23101/article/api/json?id=325364653&siteId=291194637
Recommended
Ranking