日本語版WikiPediaをタイトルで検索するプログラム

gistfile1.html

<input type="text" id="keyword">
<button id="listKeio" onclick=getFromWikipedia() class="btn btn-primary">List</button>
<div id="listOfKeio"></div>
<script type="text/javascript">
function func(json) {
  var e = document.getElementById('listOfKeio');
  e.innerHTML = "";
  
  var i;
  for (i=0; i < json.query.allpages.length; i++) {
    e.innerHTML += i + ": " + json.query.allpages[i].title + "<br>";
  }
}
 
function getFromWikipedia() {
  var e = document.getElementById('listOfKeio');
  var input = document.getElementById("keyword");
  var keyword = input.value;
  var o = document.createElement("script");
      o.setAttribute("src", "http://ja.wikipedia.org/w/api.php?action=query&list=allpages&apfrom=" + keyword + "&aplimit=50&format=json&callback=func");
  e.appendChild(o);
}
</script>