How does Codeigniter receive the ajax post data in controller

Change your ajax this:

$.ajax({        url : "<?php echo base_url(); ?>welcome/login"        type : "POST",        dataType : "json",        data : {"account" : account, "passwd" : passwd},        success : function(data) {            // do something        },        error : function(data) {            // do something        }    });

Change your controller this:

public function login() {    //$data = $this->input->post();    // now I can get account and passwd by array index    $account = $this->input->post('account');    $passwd = $this->input->post('passwd');}

I hope this work for you...

In ajax request pls use base_url('welcome/login'), like this

$.ajax({        url : "<?php echo base_url('welcome/login'); ?>"        type : "POST",        dataType : "json",        data : {"account" : account, "passwd" : passwd},        success : function(data) {            // do something        },        error : function(data) {            // do something        }    });

Use like this in controller

public function login() {    $account = $this->input->post('account');    $passwd = $this->input->post('passwd');}

I think this is work :)

Home is the controller name and login_data_submit is the function name

$.ajax({        data:{'userName':userName,'loginpassword':loginpassword},        url:'<?php echo base_url(); ?>index.php/Home/login_data_submit',        type:'post',        success:function(data) {            alert(data);        });

Controller like

public function login_data_submit(){        $data=array(            'username'=>$this->input->post('userName'),            'loginpassword'=>$this->input->post('loginpassword'),        );            }