codeigniter input post method returns empty array?

Question

I am trying to create a data-entry,with controller which inputs the data, displays it and confirm for any edit then uses a method to submit it to the model.

The problem is that in the load the model in the function post_data() the value of $this->input->post() return an empty array.

I am entering the data returning to the get_data function and then displaying it in the data.php in the view. using

data.php in view post the data to the post_data method.

<form id='form'  action="<?php echo base_url("welcome/post_data"); ?>" method="POST" style="display:inline;">           
<input type="text" name="xyz" value="<?php echo $this->input->post("xyz") ?>" />

the controller is

protected $arr;
public function index(){
    $this->load->view('index/index');
    // $this->load->library('Controllerlist');
    // print_r($this->controllerlist->getControllers());
}
public function get_data(){
    echo "matoercod";
    $this->load->view("index/data");        
}
public function post_data(){
$this->load->model("form1","form",TRUE);
 print_r($this->input->post());
    $blue=$this->form->insert_data($this->arr);
    print_r($blue);
    if($blue){
     echo "Successfully added to database"; 
    }
}}

Why does print_r() method return an empty array? $this->input->post() in the post_data method return empty array. if Iam right $this->input->post() should is global to all the method in Controller CI class.

Answer 1

Your input tag in form doesn't have a name attribute.

<form id='form'  action="<?php echo base_url("welcome/post_data"); ?>" method="POST" style="display:inline;">           
    <input name="xyz" type="text" value="<? php echo $this->input->post("xyz") ?>" />
</form>

Edit: Also the input tag is closed in a wrong way (closing before the value attribute).

<input type="text name="xyz" value="<? php echo $this->input->post("xyz") ?>" />

Answer 2

If you are loading the view data.php in get_data:

public function get_data(){
    echo "matoercod";
    $this->load->view("index/data");        
}

Then how are you accessing the get_data url? If you are just typing it in the browser, then you are not POSTing you are GETing and so $this->input->post is always going to be an empty array.

It's not entirely clear to me how you are calling your method get_data, but you should probably try to alter it so that it more carefully constructs the data you want to be displayed in any view that it loads

public function get_data(){
    $view_data = array(
        "xyz" => "here is some value" // you could get this value from anywhere
    );
    $this->load->view("index/data", $view_data);
}

Then in your view data.php you would want to refer to just $xyz instead of $this->input->post("xyz"):

<form id='form'  action="<?php echo base_url("welcome/post_data"); ?>" method="POST" style="display:inline;">           
<input type="text" name="xyz" value="<?php echo $xyz; ?>" />

Note that second parameter to the view loading function. It's an array and each associative key in the array will be expanded into a variable within your view.