<input type="text" id="title" name="judul">
<div id="hasil"><div>
<input type="button" class="btn btn-primary" value="Cek Domain" id="save" onclick="cekdb()">

<script>
function cekdb(){
    var title = $('#title').val();
    url = "<?php echo base_url(); ?>controller_form/cariData";
    var form_data = {
            title   :title
        };
    $.ajax({
        url: url,
        type: 'post',
        data: form_data,
        success: function(html){
            var data = JSON.parse(html);
            if(data.success === 0){
                var isi = "Data tidak ditemukan";
                $('#hasil').html(isi);
                $('#title').focus();
            }else{
                var isi = "Data ditemukan";
                $('#hasil').html(isi);
            }
            $('#loading').hide();
        }
    });
}
</script>
<?php
// controller_form
function cariData(){
    $title = $this->input->post('title');
    $data = $this->language_model->get_title($title,'menu')->result();
    if(!empty($data)){
        $json = array("success"=>0);
    }else{
        $json = array("success"=>1);
    }
    echo json_encode($json);
}
?>