First, I made script-html including 2 select-option menus as like below.
<script>
....
var selectedLang1 = document.getElementById('lang1').value;
var selectedSubject = document.getElementById('subject').value;
xmlhttp.open("GET","livesearchgroup_"+selectedLang1+"_"+selectedSubject
+".php?q="+str,true);
xmlhttp.send();
}
</script>
<select name="lang1" id="lang1">
<option value="co">한국어</option>
<option value="en">English</option>
<option value="af">Afrikaans</option>
<option value="ar">Arabic</option>
<option value="az">Azerbaijani</option>
<option value="be">Byelorussian (Belarusian)</option>
<option value="bg">Bulgarian</option>
<option value="bh">Bihari</option>
</select>
<select name="subject" id="subject" size="2" style="width:45%;" >
<option value="a">Infection : bacteria and virus </option>
<option value="b">Infection : virus, fungus and etc</option>
<option value="c">Malignant neoplasm</option>
<option value="d">Benign neoplasm and blood </option>
<option value="e">Endocrine, nutrition and metabolism </option>
<option value="f">Mental and behavioral disorders</option>
<option value="g">Nervous system</option>
<option value="h">Eye and ear</option>
<option value="i">Circulatory system</option>
</select>
<form>
<input type="text" size="30" onkeyup="showResult(this.value)">
</form>
<div id="livesearchgroup"></div>
And my php code is below.
<?php
$lang1=$_POST['lang1'];
$subject=$_POST['subject'];
$xmlDoc=new DOMDocument();
$xmlDoc->load("ds_".$subject."_".$lang1.".xml");
But select-option values don't come to php code. How can I receive those values in php??