From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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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>
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