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authorFlorian Merz <me@fiji-flo.de>2021-02-11 12:36:08 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 12:36:08 +0100
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----
-title: 'TypeError: can''t access property "x" of "y"'
-slug: Web/JavaScript/Reference/Erreurs/Cant_access_property
-tags:
- - Erreurs
- - JavaScript
- - TypeError
-translation_of: Web/JavaScript/Reference/Errors/Cant_access_property
----
-<div>{{jsSidebar("Errors")}}</div>
-
-<h2 id="Message">Message</h2>
-
-<pre class="syntaxbox">TypeError: Unable to get property {x} of undefined or null reference (Edge)
-TypeError: can't access property {x} of {y} (Firefox)
-TypeError: {y} is undefined, can't access property {x} of it (Firefox)
-TypeError: {y} is null, can't access property {x} of it (Firefox)
-
-Exemples
-TypeError: x is undefined, can't access property "prop" of it
-TypeError: x is null, can't access property "prop" of it
-TypeError: can't access property "prop" of undefined
-TypeError: can't access property "prop" of null
-</pre>
-
-<h2 id="Types_d'erreur">Types d'erreur</h2>
-
-<p>{{jsxref("TypeError")}}.</p>
-
-<h2 id="Quel_est_le_problème">Quel est le problème ?</h2>
-
-<p>On a tenté d'accéder à une propriété sur la valeur {{jsxref("undefined")}} ou {{jsxref("null")}}.</p>
-
-<h2 id="Exemples">Exemples</h2>
-
-<h3 id="Cas_invalides">Cas invalides</h3>
-
-<pre class="brush: js example-bad">// undefined et null ne possèdent aucune propriété et aucune méthode substring
-var toto = undefined;
-toto.substring(1); // TypeError: x is undefined, can't access property "substring" of it
-
-var toto = null;
-toto.substring(1); // TypeError: x is null, can't access property "substring" of it
-</pre>
-
-<h3 id="Corriger_le_problème">Corriger le problème</h3>
-
-<p>Pour détecter le cas où la valeur utilisée est <code>undefined</code> ou <code>null</code>, on peut utiliser l'opérateur <code><a href="/fr/docs/Web/JavaScript/Reference/Opérateurs/L_opérateur_typeof">typeof</a></code>. Par exemple :</p>
-
-<pre class="brush: js">if (typeof toto !== 'undefined') {
- // On sait alors que toto est bien défini et on peut utiliser ses propriétés s'il en a.
-}</pre>
-
-<h2 id="Voir_aussi">Voir aussi</h2>
-
-<ul>
- <li>{{jsxref("undefined")}}</li>
- <li>{{jsxref("null")}}</li>
-</ul>