Loading helper

To see some how the loading helper can be used, look at the example.

You can view the source on GitHub.

Example setup

$loading = new loading();

$loading = new loading('profile');

$loading = new loading(array(
        'profile'           => 'profile', // Use 'loading.profile.*' config.
        'time_out'          => (5 * 60),  // Seconds before script will timeout.
        'refresh_frequency' => 2,         // Seconds browser will wait before trying again.
        'refresh_url'       => '/../',    // If you want the user to load a different url while waiting (e.g. add a new parameter).
        'template_name'     => 'loading', // Customised loading page name (in /app/template/), see example below.
        'template_path'     => '/../',    // Customised loading page path.
        'lock'              => $lock,     // See lock example below.
    ));

Basic example

This uses the session helper to store the loading state:

// $loading->template_test();

$loading->check();
    // Will exit() with loading page if still running,
    // return the variables if there was a time-out,
    // or return false if not running.

if ($form->submitted()) {

    // Any extra validation

    if ($form->valid() && !$loading->start('Starting action')) {

            // The start string will replace [MESSAGE] in the template,
            // or you can use an array for multiple tags.

        $form->error_add('Already processing');
    }

    if ($form->valid()) {

        sleep(5);

        $loading->update('Updating progress');

        sleep(5);

        $loading->done('/../');
            // If you specify a URL, it will perform a redirect.

        exit();

    }
}

Lock example

If you have a process that shouldn't allow multiple users to run it at the same time, we can use the lock helper.

$lock = new lock('loading');

$loading = new loading(array(
        'lock' => $lock,
    ));

$loading->check();

if ($form->submitted()) {

    // Any extra validation

    if ($form->valid() && !$loading->start('Starting action')) {
        $form->error_add('Could not open lock');
    }

    if ($form->valid()) {

        sleep(5);

        $loading->update('Updating progress');

        sleep(5);

        $loading->done('/../');
            // If you specify a URL, it will perform a redirect.

        exit();

    }

}

Templates

If you want to change the layout/content of the loading page, use these files:

/app/public/a/css/global/loading.css

    This file will be used with a template like
    the one below, or you can create your own.

/app/template/loading.ctp

    This file will be used if 'template_name' is
    set to 'loading', the contents should be
    something like the following.

    <!DOCTYPE html>
    <html lang="<?= html(config::get('output.lang')) ?>" xml:lang="<?= html(config::get('output.lang')) ?>" xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta charset="<?= html(config::get('output.charset')) ?>" />
        <title>Loading</title>
        <link rel="stylesheet" type="text/css" href="<?= html(timestamp_url('/a/css/global/loading.css')) ?>" media="all" />
    </head>
    <body>
        <main id="page_content">
            <h1>Loading</h1>
            <p>[MESSAGE]... [[TIME_START]]</p>
        </main>
    </body>
    </html>

The templates can use a few tags:

[MESSAGE]
[TIME_START]
[TIME_UPDATE]
[URL]

You can include additional tags if you pass an array to the start/update methods:

$loading->update(array(
        'message' => 'Updating progress',
    ));

You can also test the template by running:

$loading->template_test();
exit();