creating back page links in Codeigniter - php

Question

I have a page with URL http://arslan/admin/category/index/0/name/asc/10 in Codeigniter.
In this URL, the uri_segment start from 0. This (0) is the default search value, name and asc are the default sort field and order, and 10 is the pagination index.
Now if I move to an add page with URL (http://arslan/admin/category/add/)
similarly like above "add" is the current function.
Now if i want to go back through a link to back page... How can I divert the user back? I can't make the URL go back.
Can somebody help me please?

Answer 1

I am not sure if i understand the question correctly, if not please ignore my answer, but I think you want a link to "go back to previous page", similar to the back-button in a web browser.
If so you could use javascript to solve this by simply using this line:
Go back

Answer 2

I extend the session class by creating /application/libaries/MY_Session.php
class MY_Session extends CI_Session {
function __construct() {
parent::__construct();
$this->tracker();
}
function tracker() {
$this->CI->load->helper('url');
$tracker =& $this->userdata('_tracker');
if( !IS_AJAX ) {
$tracker[] = array(
'uri' => $this->CI->uri->uri_string(),
'ruri' => $this->CI->uri->ruri_string(),
'timestamp' => time()
);
}
$this->set_userdata( '_tracker', $tracker );
}
function last_page( $offset = 0, $key = 'uri' ) {
if( !( $history = $this->userdata('_tracker') ) ) {
return $this->config->item('base_url');
}
$history = array_reverse($history);
if( isset( $history[$offset][$key] ) ) {
return $history[$offset][$key];
} else {
return $this->config->item('base_url');
}
}
}
And then to retrieve the URL of the last page visited you call
$this->session->last_page();
And you can increase the offset and type of information returned etc too
$this->session->last_page(1); // page before last
$this->session->last_page(2); // 3 pages ago
The function doesn't add pages called using Ajax to the tracker but you can easily remove the if( !IS_AJAX ) bit to make it do so.
Edit:
If you run to the error Undefined constant IS_AJAX, assumed IS_AJAX
add the line below to /application/config/constants.php
define('IS_AJAX', isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest');

Answer 3

There are two ways to solve your problem: First you could place a link that is using the javascript back-function onclick, like this ...
go back
... or you always save the current full page url into a cookie and use that for generating the back link - a helper could look like this (not tested) ...
/**
* save url to cookie
*/
if(!function_exists('urlhistory_save'))
{
function urlhistory_save()
{
$CI =& get_instance();
$CI->load->library('session');
$array = array(
'oldUrl' = $CI->session->userdata('newurl'),
'newurl' = $CI->uri->uri_string()
);
$CI->session->set_userdata($array);
}
}
/**
* get old url from cookie
*/
if(!function_exists('urlhistory_get'))
{
function urlhistory_get()
{
$CI =& get_instance();
$CI->load->library('session');
return $CI->session->userdata('oldurl');
}
}
In your controller you would use urlhistory_save() to save the current URL and in the view youd could use urlhistory_get() to retreive the old address like this:
<a href="<?php echo base_url().urlhistory_get(); ?>go back</a>

Answer 4

The most simplest way to redirect to your previous page , try this it work for me
redirect($this->agent->referrer());
you need to import user_agent library too $this->load->library('user_agent');

Answer 5

You can create a Session to go to back page as:
$this->session->set_userdata('ses_back_jobs','controller
name'.array_pop(explode('controller name',$this->input->server('REQUEST_URI'),2))); //Back page
Then if u want to redirect to some page use it:
redirect($this->session->userdata('ses_back_jobs'));
or use it to the anchor.