ajax is not sending data to controller - codeigniter

Question

ajax is not sending data to controller
var url = "<?php echo base_url(); ?>";
function allowip() {
var url = "<?php echo base_url(); ?>"
var id = $('#path').attr('value');
$.ajax({
type: "POST",
url: url+"client/home/get_ip",
//dataType: 'text',
data: {'id': id},
//cache: false,
success: function(abc) {
alert(abc);
},
error:function(data) {
alert('no working');
}
});
}
alert is showing with data but not sending data to controller
controller is empty
public function get_ip($id)
{
$day = $this->input->post('id');
echo $day;
}

Answer 1

As your get_ip function have argument $id so it must need to pass on it, url keyword might be conflicting so use different variable name and get the value from #path with val() function.
It might help:
function allowip() {
var id = $('#path').val();
var request_url = "<?php echo base_url(); ?>"+"client/home/get_ip/"+id;
$.ajax({
type: "POST",
url: request_url,
data: {'id': id},
success: function(abc) {
alert(abc);
},
error:function(data) {
alert('no working');
}
});
}
public function get_ip($id)
{
echo $id;
}
or you can do is to post $id in data as you're already doing it but only have to change some lines:
function allowip() {
var id = $('#path').val();
var request_url = "<?php echo base_url(); ?>"+"client/home/get_ip/";
$.ajax({
type: "POST",
url: request_url,
data: {'id': id},
success: function(abc) {
alert(abc);
},
error:function(data) {
alert('no working');
}
});
}
public function get_ip()
{
$day = $this->input->post('id');
echo $day;
}

Answer 2

You are sending a parameter to a function so you can change your code like this
function allowip() {
var id = $('#path').attr('value');
var url = "<?php echo base_url(); ?>"+"client/home/get_ip/"+id
$.ajax({
type: "GET",
url: url,
dataType: "html",
success: function(abc) {
alert(abc);
},
error:function(data) {
alert('no working');
}
});
}
and your action will be
public function get_ip($id)
{
echo $id;
}

Answer 3

I think it is probably the way you are getting the value. It's hard to tell without seeing the view code, but I will assume that $('#path') is an <input...> element of some sort. If that is correct then try getting the value like this
var id = $('#path').val();
Forget about using an argument with the get_ip() function. You are posting to the controller not creating a URL with argument values. Try this.
public function get_ip()
{
$day = $this->input->post('id');
echo !empty($day) ? $day : "No Input"; //or, an empty string instead?
}