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HTMLFormElement: length property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The HTMLFormElement.length
read-only property returns the number of controls in the <form>
element.
You can access the list of the form's controls using the
elements property.
This includes both elements that are descendants of the <form>
element as well as elements that are made members of the form using their
form property.
Elements that are considered for this property are: <button>,
<fieldset>, <input> (with the exception
that any whose type is "image" are omitted for historical reasons),
<object>, <output>, <select>,
and <textarea>.
js
if (document.getElementById("form1").length > 1) {
// more than one form control here
}