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.


numControls = form.length;


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.


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


Browser compatibility

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ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support YesEdge ? Firefox Full support YesIE ? Opera Full support YesSafari ? WebView Android ? Chrome Android Full support YesEdge Mobile ? Firefox Android Full support YesOpera Android Full support YesSafari iOS ? Samsung Internet Android ?


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Full support
Compatibility unknown  
Compatibility unknown

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Last updated by: mfluehr,