Demo of Autocomplete position option in JQuery UI








value from autocomplete object
Select to read autocomplete object position values


my Horizontal
my Vertical
at Horizontal  
at Vertical  

Change above 4 options to see how the menu changes its position.
at & my element for position


Position option of Menu UI

HTML

<input id=my_menu>
<div id=d1 class="bg-info"></div><br>
value from autocomplete object<br>
<div id=d2 class="bg-warning">Select to read autocomplete object position values</div>
<br><br>
<div class='row'> <div class='col-md-6'>
<span class="label label-primary">my Horizontal</span>
<div class='radio-inline'>
  <label><input type='radio' class='rd' name='r1' id='r1' value='left' checked>left</label>
</div>
<div class='radio-inline'>
  <label><input type='radio' class='rd' name='r1' id='r2' value='center' >center</label>
</div>
<div class='radio-inline'>
  <label><input type='radio' class='rd' name='r1' id='r2' value='right' >right</label>
</div>
</div><div class='col-md-6'> <span class="label label-primary">my Vertical</span>
<div class='radio-inline'>
  <label><input type='radio' class='rd' name='r2' id='r1' value='top' checked>top</label>
</div>
<div class='radio-inline'>
  <label><input type='radio' class='rd' name='r2' id='r2' value='center' >center</label>
</div>
<div class='radio-inline'>
  <label><input type='radio' class='rd' name='r2' id='r2' value='bottom' >bottom</label>
</div>

</div></div>

<div class='row'><div class='col-md-6'> <span class="label label-primary"> at  Horizontal  </span>  
<div class='radio-inline'> 
  <label> <input type='radio' class='rd' name='r3' id='r1' value='left' checked>left </label>
</div>
<div class='radio-inline'>
  <label><input type='radio' class='rd' name='r3' id='r2' value='center' >center</label>
</div>
<div class='radio-inline'>
  <label><input type='radio' class='rd' name='r3' id='r2' value='right' >right</label>
</div>
</div><div class='col-md-6'><span class="label label-primary"> at Vertical</span>  
<div class='radio-inline'>
  <label><input type='radio' class='rd' name='r4' id='r1' value='top' >top</label>
</div>
<div class='radio-inline'>
  <label><input type='radio' class='rd' name='r4' id='r2' value='center' >center</label>
</div>
<div class='radio-inline'>
  <label><input type='radio' class='rd' name='r4' id='r2' value='bottom' checked>bottom</label>
</div>

jquery

<script>
$(document).ready(function() {
$(document).ready(function() {
////////
var my_h=my_v=at_h=at_v='';
my_h=$("input[name=r1]:checked").val()
my_v=$("input[name=r2]:checked").val()

at_h=$("input[name=r3]:checked").val()
at_v=$("input[name=r4]:checked").val()
//$( "#my_menu" ).autocomplete( "option", "position", { my : "" + my_h + " " + my_v +"", at: "" + at_h + " " + at_v + ""} );
$('#d1').html( " \$( \"#auto_c\" ).autocomplete( \"option\", \"position\", { <b>my</b>: "+"\"" + my_h + "  " + my_v +"\",  <b>at</b>: " + "\"" + at_h + "  " + at_v + "\"})");
////////////////
$( "#auto_c" ).autocomplete({
 source: [ "PHP", "JQuery", "JavaScript" ],
 minLength:0
});
///////////////
//////////
$(".rd").click(function() {
my_h=$("input[name=r1]:checked").val()
my_v=$("input[name=r2]:checked").val()

at_h=$("input[name=r3]:checked").val()
at_v=$("input[name=r4]:checked").val()
$( "#auto_c" ).autocomplete( "option", "position", { my : "" + my_h + " " + my_v +"", at: "" + at_h + " " + at_v + ""} );
$('#d1').html( " \$( \"#auto_c\" ).autocomplete( \"option\", \"position\", { <b>my</b>: "+"\"" + my_h + "  " + my_v +"\",  <b>at</b>: " + "\"" + at_h + "  " + at_v + "\"})");
$('#auto_c').autocomplete("search", "");

var option_obj = $( "#auto_c" ).autocomplete( "option" );
$('#d2').html( "position my : "  + option_obj.position.my + " , position at : "  + option_obj.position.at);
})
///////////////////////
})
</script>