HTMLFormElement.length
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.
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La propriété en lecture seule HTMLFormElement.length retourne le nombre de contrôles présents dans l'élément <form>.
Syntaxe
js
integer = form.length;
Exemple
js
if (document.getElementById("form1").length > 1) {
// more than one form control here
}