How to achieve Post-Redirect-Get on Wordpress Plugin Admin Menu Page?

Question

I am writing a Wordpress plugin that adds an admin menu page. There is a form on the page. When the form is submitted, the plugin writes to the database. But then I came across a problem: whenever the user reloads the page, they ask him whether to send POSTDATA again. If the user clicks "Yes", the plugin writes to the database again.

After some searching, I found a solution, the "Post-Redirect-Get" template. Then, later, I found it difficult to implement this template in the Wordpress plugin.

• The plugin itself cannot send HTTP 301/302, because there is some content already issued by the Wordpress core.

• You can insert a meta tag in the HTML header (in order to issue a redirect). But according to the W3C, the meta redirect is out of date, so I think it's best not to use it.

• Use JavaScript window.location . But what if JavaScript is disabled in the user's browser?

Is there any other way to redirect?

Answer 1

You can try to do your plugin handling in the admin_init hook, which, I believe, is executed before any content is output.

Answer 2

To save a lot of work. Just use the WordPress api settings.

Codex Article → here

Otto's more useful article → here

Using the WordPress settings, the api will take care of the "Post-Redirect-Get" problem that you are describing.

Answer 3

• check if the table exists in the database or insert in sql if no exists for inaction, if the table exists in the database.

• option set_option, in which the plugin is activated.

• use register_activation_hook wordpress function to enable activation activation plugin

Sorry for my english, very bad, but I think you can understand