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----
-title: insertItemAt
-slug: Archive/Mozilla/XUL/Method/insertItemAt
-tags:
-  - XUL Methods
-  - XUL Reference
-translation_of: Archive/Mozilla/XUL/Method/insertItemAt
----
-<div class="noinclude">
-  <span class="breadcrumbs XULRefMeth_breadcrumbs">« <a href="/ja/docs/XUL_Reference" title="/ja/docs/XUL_Reference">XUL リファレンス HOME</a></span></div>
-<dl>
-  <dt><span id="m-insertItemAt"><code><a href="https://developer.mozilla.org/ja/docs/Mozilla/Tech/XUL/Method/insertItemAt">insertItemAt( index, label, value )</a></code></span></dt>
-  <dd>戻り値の型: <em>要素</em></dd>
-  <dd>このメソッドは新しい項目を生成し、それを指定した位置に挿入します。値の設定は任意です。新しい項目要素を返します。</dd>
-</dl>
-
-<div class="noinclude">
-  <p><strong>注意:</strong> 存在しない <var>index</var> に項目を挿入することはできません。例: <code>element.getRowCount() + 1</code> で末尾に項目を挿入する。</p>
-  <h3 id="Example" name="Example">例</h3>
-  <pre class="brush:js">&lt;!-- This example inserts at the selected item or appends, then selects the newly created item --&gt;
-&lt;script language="javascript"&gt;
-function insertItemToList() {
-  var myListBox = document.getElementById('myListBox');
-
-  // create a date to get some labels and values
-  var someDate = new Date();
-
-  if(myListBox.selectedIndex == -1){
-    // no item was selected in list so append to the end
-    myListBox.appendItem( someDate.toLocaleTimeString(), someDate.getTime() );
-    var newIndex = myListBox.getRowCount()  -1
-  } else {
-    // item was selected so insert at the selected item
-    var newIndex =  myListBox.selectedIndex;
-    myListBox.insertItemAt(newIndex, someDate.toLocaleTimeString(), someDate.getTime());
-  }
-
-  // select the newly created item
-  myListBox.selectedIndex = newIndex;
-}
-&lt;/script&gt;
-
-&lt;button label="Insert item at selected" oncommand="insertItemToList()" /&gt;
-
-&lt;listbox id="myListBox"&gt;
-    &lt;listitem label="foo" /&gt;
-&lt;/listbox&gt;
-</pre>
-
-  <h3 id="See_also" name="See_also">関連情報</h3>
-<ul>
-  <li><a href="/ja/docs/XUL/Method/appendItem"><code>appendItem()</code></a></li>
-  <li><a href="/ja/docs/XUL/Method/removeItemAt"><code>removeItemAt()</code></a></li>
-</ul>
-
-</div>