jslider with submit form

[E-MediaTN]

I'm working with jslider but when I make it into form and I try to submit with ajax, the return value will appear in my div of resultats

<form method="post" action="#" class="search" >
<div class="layout-slider">
Area
<input id="area" type="slider" name="area" value="10;300" >
</div>
</form>

jQuery('#area').slider({
from: 10,
to: 300,
scale: [10, '|', 68, '|', 145, '|', 223 ,'|', 300],
limits: false,
step: 1,
dimension: 'm',
skin: 'round_plastic'
});

$(".search").on("submit", function(event) {
event.preventDefault();
var datas = $( this ).serialize();
$.ajax({
type:'POST',
cache: false,
url: my_url,
data : datas,
success: function(data) {
$("#results").html(data);
}
});

});

in my div #results it's print me : 1030010300 before my html data and don't know from what it's shown