How to create an embedded code for wordpress shortcode?

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If you want it to show on 3-rd website, wich is not wordpress or isn’t using your plugin than the only way is to use iframe

Aldought there might be better solutions, i would do it these way:

  1. Create ajax action ( wp_ajax_nopriv_.... )
  2. in callback write the code that should echo ( your shortcode ). see example under a list
  3. add some feature that will generate url and redirect it to your ajax calls, for ex. instead of yoursite.com/wp-admin/admin-ajax.php?action=iframe&arg1=test you’ll have something like yoursite.com?blahblah wich in .htaccess or php will redirect it to ajax url ( the first one ) [ these step is not nesseccery ]
  4. Provide your visitors an link builder or something like it, so they could just copy-paste embedded code

The callback ex.:

$arg1 = $_GET['arg1']; // get all variables that cann be used in shortcode
?>
<html><head>....</head><body><?php echo do_shortcode( '[your_shortcode arg1="' . $arg1 . '"]' ); ?></body></html>
<?php die();

in head, or before </body> you should do wp_enqueue_script( 'your_script' ... ) and wp_enqueue_style( 'your_style' .. ) related to your shortcode, for their proper look atc.

And generated code ( without 3 step ) should look like these:

<iframe src="http://yoursite.com/wp-admin/admin-ajax.php?action=iframe&arg1=test"></iframe>

And it should show your shortcode on every website