files/it/web/api/mouseevent/altkey/index.html


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---
title: event.altKey
slug: Web/API/MouseEvent/altKey
tags:
  - DOM
  - Gecko
  - Reference_del_DOM_di_Gecko
  - Tutte_le_categorie
translation_of: Web/API/MouseEvent/altKey
translation_of_original: Web/API/event.altKey
original_slug: Web/API/Event/altKey
---
<p>{{ ApiRef() }}</p>
<h3 id="Sommario" name="Sommario">Sommario</h3>
<p>Indica se il tasto ALT era premuto mentre l'evento si verificava.</p>
<h3 id="Syntax" name="Syntax">Syntax</h3>
<pre class="eval"><i>bool</i> = event.altKey
</pre>
<p><code>bool</code> vale <code>true</code> se il tasto ALT era premuto, altrimenti <code>false</code>.</p>
<h3 id="Esempio" name="Esempio">Esempio</h3>
<pre>&lt;html&gt;
&lt;head&gt;
&lt;title&gt;esempio tasto ALT&lt;/title&gt;

&lt;script type="text/javascript"&gt;

function mostraCarattere(e){
  alert(
    "Tasto premuto: " + String.fromCharCode(e.charCode) + "\n"
    + "Codice carattere: " + e.charCode + "\n"
    + "Tasto ALT premuto: " + e.altKey + "\n"
  );
}

&lt;/script&gt;
&lt;/head&gt;

&lt;body onkeypress="mostraCarattere(event);"&gt;
&lt;p&gt;
Prova a premere un tasto tenendo premuto ALT e prova a premere un tasto senza premere ALT.&lt;br /&gt;
Puoi anche provare a premere ALT+SHIFT.
&lt;/p&gt;
&lt;/body&gt;
&lt;/html&gt;
</pre>
<h3 id="Specifiche" name="Specifiche">Specifiche</h3>
<p><a class="external" href="http://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113/events.html#Events-MouseEvent-altKey">altKey </a></p>
<p>{{ languages( { "en": "en/DOM/event.altKey", "pl": "pl/DOM/event.altKey" } ) }}</p>