Ajax not posting when value based on selectbox - php

Question

What I have here is ajax that's post information into textbox from database. This ajax work's in input field, but when I tried to use select box it doesn't working. Why is that?
not working
<select id="tag"><option value="">none</option><option value="crs">crs</option></select>
working
<input name="tag" id="tag" type="text" value="" />
Index.php
<select id="tag"><option value="">none</option><option value="crs">crs</option></select>
<input name="output" id="output" type="text" value="" />
<script type="text/javascript">
$(document).ready(function()
{
$('input[id="tag"]').change(function()
{
var prjt_code = $("#tag").val();
$.ajax({
type: "POST",
url: "autocomplete-ajax.php",
data :"prjt_code="+prjt_code,
dataType:'html',
type:'POST',
success:function(data){
//alert(data);
$('#output').val(data);
}
});
return false;
});
});
</script>
autocomplete-ajax.php
<?php
if(isset($_POST['prjt_code'])) {
$prjt_code = $_POST['prjt_code'];
$sql = $mysqli1->query("SELECT * FROM project WHERE project='$prjt_code'");
while($row1 = $sql->fetch_assoc())
{
$code = $row1['project_code'];
}
echo $code;
}
?>

Answer 1

You are targeting input[id="tag"] when you want select[id="tag"]
http://jsfiddle.net/releaf/U28jb/
$(document).ready(function() {
$('select[id="tag"]').on('change', function() {
var prjt_code = $("#tag").val();
alert(prjt_code);
$.ajax({
type: "POST",
url: "autocomplete-ajax.php",
data :"prjt_code="+prjt_code,
dataType:'html',
type:'POST',
success:function(data){
//alert(data);
$('#output').val(data);
}
});
return false;
});
});