HTML DOM Button form properties
Button Objects Definition and Usage
form property returns to the form that contains the button references.
If you include the button, it returns a form object, if not included in the button, it returns null.
grammar
buttonObject.form
Browser Support
All major browsers support form property.
Examples
Examples
The following example returns form the button belongs id:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>本教程(w3big.com)</title>
</head>
<body>
<form id="form1">
<button id="button1" type="button">点我!</button>
</form>
<p>含有按钮的表单的ID:
<script>
document.write(document.getElementById("button1").form.id);
</script></p>
</body>
</html>
<html>
<head>
<meta charset="utf-8">
<title>本教程(w3big.com)</title>
</head>
<body>
<form id="form1">
<button id="button1" type="button">点我!</button>
</form>
<p>含有按钮的表单的ID:
<script>
document.write(document.getElementById("button1").form.id);
</script></p>
</body>
</html>
try it"
Button Objects