Empty data result ajax with codeigniter - ajax

Question

I'm trying to retrieve data from my controller function but this very simple example fails and sends me nothing back. The ajax function is successfully executed but the data is empty.
function company_select() {
var data;
var username = $('[name="username"]').val();
var url = base_url+'/admin/user/get_companies2';
alert(url);
$.ajax({
url: url,
type: 'POST',
dataType: 'text',
success: function(data){
alert(data);
},
error: function(jqXHR, textStatus, errorThrown) { alert(textStatus + " " + errorThrown) }
});
}
codeigniter function
public function get_companies2(){
echo 'test';
}

Answer 1

You Should Use "data" instead of "dataType" Or Passed your require variables one by one as into curli braces of data (as data:{variable1:})
function company_select(){
var data;
var username = $('[name="username"]').val();
var url = base_url+'/admin/user/get_companies2';
alert(url);
$.ajax({
url: url,
type: 'POST',
data: {username :username},
success: function(data){
alert(data);
},
error: function(jqXHR, textStatus, errorThrown) { alert(textStatus + " " + errorThrown) }
});
}