creating back page links in Codeigniter

问题:

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?

回答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:

<a href="javascript:window.history.go(-1);">Go back</a>

回答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');

回答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 ...

<a href="javascript:history.back()">go back</a>

... 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>

回答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');

回答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.