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+---
+title: blocked
+slug: Web/API/IDBRequest/blocked_event
+translation_of: Web/API/IDBOpenDBRequest/blocked_event
+---
+<p>Le handler <strong>blocked</strong> est exécuté lorsque l'ouverture d'une connexion à une base de données bloque une transaction <em>versionchange</em> sur celle-ci.</p>
+
+<h2 id="Informations_générales">Informations générales</h2>
+
+<dl>
+ <dt style="float: left; text-align: right; width: 120px;">Spécification</dt>
+ <dd style="margin: 0 0 0 120px;"><a class="external" href="http://www.w3.org/TR/IndexedDB/#request-api">IndexedDB</a></dd>
+ <dt style="float: left; text-align: right; width: 120px;">Interface</dt>
+ <dd style="margin: 0 0 0 120px;">IDBVersionChangeEvent</dd>
+ <dt style="float: left; text-align: right; width: 120px;">Propagation</dt>
+ <dd style="margin: 0 0 0 120px;">Non</dd>
+ <dt style="float: left; text-align: right; width: 120px;">Annulable</dt>
+ <dd style="margin: 0 0 0 120px;">Non</dd>
+ <dt style="float: left; text-align: right; width: 120px;">Cible</dt>
+ <dd style="margin: 0 0 0 120px;">IDBRequest</dd>
+ <dt style="float: left; text-align: right; width: 120px;">Action par défaut</dt>
+ <dd style="margin: 0 0 0 120px;">Aucune</dd>
+</dl>
+
+<h2 id="Propriétés">Propriétés</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Property</th>
+   <th scope="col">Type</th>
+   <th scope="col">Description</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td><code>target</code> {{readonlyInline}}</td>
+   <td>{{domxref("EventTarget")}}</td>
+   <td>The request concerned by this event.</td>
+  </tr>
+  <tr>
+   <td><code>type</code> {{readonlyInline}}</td>
+   <td>{{domxref("DOMString")}}</td>
+   <td>The type of event.</td>
+  </tr>
+  <tr>
+   <td><code>bubbles</code> {{readonlyInline}}</td>
+   <td>{{jsxref("Boolean")}}</td>
+   <td>Whether the event normally bubbles or not.</td>
+  </tr>
+  <tr>
+   <td><code>cancelable</code> {{readonlyInline}}</td>
+   <td>{{jsxref("Boolean")}}</td>
+   <td>Whether the event is cancellable or not.</td>
+  </tr>
+  <tr>
+   <td><code>newVersion</code> {{readonlyInline}}</td>
+   <td>unsigned long (int)</td>
+   <td>The new version of the database.</td>
+  </tr>
+  <tr>
+   <td><code>oldVersion</code> {{readonlyInline}}</td>
+   <td>unsigned long (int)</td>
+   <td>The old version of the database.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Exemple">Exemple</h2>
+
+<pre class="brush:js; line-numbers  language-js"><code class="language-js"><span class="keyword token">var</span> req1 <span class="operator token">=</span> indexedDB<span class="punctuation token">.</span><span class="function token">open</span><span class="punctuation token">(</span><span class="string token">"addressbook"</span><span class="punctuation token">,</span> <span class="number token">3</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+
+req1<span class="punctuation token">.</span>onsuccess <span class="operator token">=</span> <span class="keyword token">function</span><span class="punctuation token">(</span> event <span class="punctuation token">)</span> <span class="punctuation token">{</span>
+  <span class="keyword token">var</span> addressbookDB <span class="operator token">=</span> event<span class="punctuation token">.</span>target<span class="punctuation token">.</span>result<span class="punctuation token">;</span>
+
+  <span class="comment token">// Essayons d'ouvrir la même base de données avec une version de révision plus élevée</span>
+  <span class="keyword token">var</span> req2 <span class="operator token">=</span> indexedDB<span class="punctuation token">.</span><span class="function token">open</span><span class="punctuation token">(</span><span class="string token">"addressbook"</span><span class="punctuation token">,</span> <span class="number token">4</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+
+  <span class="comment token">// Dans ce cas, le handler onblocked</span> sera exécuté
+  req2<span class="punctuation token">.</span>onblocked <span class="operator token">=</span> <span class="keyword token">function</span><span class="punctuation token">(</span> e <span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span>e<span class="punctuation token">)</span>
+  <span class="punctuation token">}</span><span class="punctuation token">;</span>
+
+<span class="punctuation token">}</span><span class="punctuation token">;</span></code></pre>
+
+<h2 id="Evénements_liés">Evénements liés</h2>
+
+<ul>
+ <li>{{event("success")}}</li>
+ <li>{{event("error")}}</li>
+ <li>{{event("abort")}}</li>
+ <li>{{event("complete")}}</li>
+ <li>{{event("upgradeneeded")}}</li>
+ <li>{{event("blocked")}}</li>
+ <li>{{event("versionchange")}}</li>
+</ul>
+
+<h2 id="Voir_aussi">Voir aussi</h2>
+
+<ul>
+ <li><a href="/fr/docs/IndexedDB/Using_IndexedDB">Utilisation d'IndexedDB</a></li>
+</ul>