How to avoid browser cache using Codeigniter

Question

Facing issue related to browser chache.

function doUpload(){

  $data['includeView'] = "profileconfirm";

 $config['upload_path'] = './img/images/uploaded/';
 $config['allowed_types'] = 'gif|jpg|png|jpeg';
 $config['max_size'] = '5000';
 $config['max_width']  = '1024';
 $config['max_height']  = '768';
 $config['file_ext'] =".jpeg";
 $config['file_name'] = $profileId.$config['file_ext'];
 $config['overwrite'] = TRUE;
 $this->load->library('upload', $config);

 $query = null ; 

 if ( ! $this->upload->do_upload()){
  // Error here
 }else{
 // Image uploaded sucess fully
 // $profile - business logic to populate $profile

  $data['PROFILE_DETAILS'] = $profile;

 $this->load->view('index', $data);
}

this method is used for image upload. After successful image upload, it loads index view page, which internally includes profileconfirm view page.

But on profileconfirm page new uploaded image is not going to reflect. Some times it works fine, but some times not, this is happen most of the times.

Please help

Francesco Laurita · Accepted Answer · 2011-01-24 12:13:22Z

13

You can send proper headers to the client to disable the cache:

....
$this->output->set_header("HTTP/1.0 200 OK");
$this->output->set_header("HTTP/1.1 200 OK");
$this->output->set_header('Last-Modified: '.gmdate('D, d M Y H:i:s', $last_update).' GMT');
$this->output->set_header("Cache-Control: no-store, no-cache, must-revalidate");
$this->output->set_header("Cache-Control: post-check=0, pre-check=0");
$this->output->set_header("Pragma: no-cache");
$this->load->view('index', $data);

Note: Output class is initialized automatically

answered Jan 24, 2011 at 12:13

Francesco Laurita

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Comments

Mavelo · Accepted Answer · 2011-08-26 20:56:53Z

4

Just add a timestamp to the src attribute of the image being displayed.

<img src="filename.jpg?<?php echo time(); ?>">

To disable the cache completely with one line of code (after extending the Output library) review http://www.robertmullaney.com/2011/08/13/disable-browser-cache-easily-with-codeigniter/
Disclaimer, my blog

_{Edit 1: The accepted solution is overkill in my opinion when all you want to do force-reload the image in the browser ;)}
_{Edit 2: Simplified the suggested solution.}

edited Aug 26, 2011 at 20:56

answered Aug 20, 2011 at 17:03

Mavelo

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Comments

RobertPitt · Accepted Answer · 2011-01-24 12:09:52Z

-1

Try the following:

if (!$this->upload->do_upload())
{
    $error = array('errors' => $this->upload->display_errors("<li>","</li>"));
    $this->load->view('index', $error);
}else{
    $data['PROFILE_DETAILS'] = $profile;
    $this->load->view('index', $data);
}

and then display the errors in your view like so:

<?php if($errors): ?>
   <ul><?php print $errors ?></ul>
<?php endif; ?>

and see what errors your getting.

answered Jan 24, 2011 at 12:09

RobertPitt

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2 Comments

Vicky Over a year ago

I am not getting any error, my issue is related to chache. File uploaded successfully on server folder, but newly uploaded file is not reflected on confirm page img tag

Mavelo Over a year ago

@Vicky that is because images and pages are cached independently. See my solution above for how to prevent image caching in your template ;)

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