$('#ekle').on('submit', function (e) {

		e.preventDefault();

		var action = "<?= base_url('blog/kayit'); ?>";

		$.ajax({
			url: action,
			type: 'POST',
			data: new FormData(this),
			contentType: false,
			cache: false,
			processData: false,
			success: function (result) {

				result = JSON.parse(result);

				if (result['success']) {

					alert(result['success']['content']);

				} else {

					alert(result['error']['content']);

				}
			}
		});

	});

<form id="ekle" class="form-horizontal" method="post" enctype="multipart/form-data">

<div class="form-group">
<input type="text" class="form-control input-sm" name="baslik" id="baslik" >
<input type="submit" value="Tamam" class="btn btn-success btn-s-xs" id=""/>
</div>

</form>

$('#ekle').on('submit', function (e) {

		e.preventDefault();

});