HTMLFormElement.length

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 descendents of the <form> element as well as elements that are made members of the form using their form property.

The elements which are included by HTMLFormElement.elements and HTMLFormElement.length are:

No other elements are included in the list returned by elements, which makes it an excellent way to get at the elements most important when processing forms.

Syntax

numControls = form.length;

Value

numControls is the number of form controls within the <form>. This is the same as the number of the elements in the HTMLFormControlsCollection returned by the elements property.

Example

if (document.getElementById('form1').length > 1) {
  // more than one form control here
}

Specifications

Browser compatibility

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DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
lengthChrome Full support YesEdge Full support 12Firefox Full support YesIE ? Opera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown