Dynamic validation

Hi, I would like dynamically verify the value from text input with jquery and ajax. If i found the same text in database, field should throw an error. But I dont know if it is possible in gravity form.

jQuery code

$('#input_1_3').blur(function() {
        $.ajax({
            url: '/wp-admin/admin-ajax.php',
            type: 'post',
            data: {
              temp: document.getElementById('input_1_3').value,
              action: 'checkName'
            },
            success: function(ret) {
              console.log('Check name: '+ret);
            },
            dataType: 'html'
          });
    });
)

Can you help me??

Thanks cuptech