The install and uninstall functions will be called (i.e. re-installed) if the addon changes after installation.
Therefore your uninstall should not destroy data and install should consider that data may already exist.
-Future extensions may provide for "setup" amd "remove".
+Future extensions may provide for "setup" and "remove".
## PHP addon hooks
`$function` is a string and is the name of the function which will be executed when the hook is called.
### Arguments
-Your hook callback functions will be called with at least one and possibly two arguments
+Your hook callback functions will be called with at most one argument
- function <addon>_<hookname>(App $a, &$b) {
+ function <addon>_<hookname>(&$b) {
}
If you wish to make changes to the calling data, you must declare them as reference variables (with `&`) during function declaration.
-#### $a
-$a is the Friendica `App` class.
-It contains a wealth of information about the current state of Friendica:
-
-* which module has been called,
-* configuration information,
-* the page contents at the point the hook was invoked,
-* profile and user information, etc.
-
-It is recommeded you call this `$a` to match its usage elsewhere.
-
#### $b
$b can be called anything you like.
This is information specific to the hook currently being processed, and generally contains information that is being immediately processed or acted on that you can use, display, or alter.
Your addon can provide user-specific settings via the `addon_settings` PHP hook, but it can also provide node-wide settings in the administration page of your addon.
-Simply declare a `<addon>_addon_admin(App $a)` function to display the form and a `<addon>_addon_admin_post(App $a)` function to process the data from the form.
+Simply declare a `<addon>_addon_admin()` function to display the form and a `<addon>_addon_admin_post()` function to process the data from the form.0
## Global stylesheets
}
-function <addon>_head(App $a)
+function <addon>_head()
{
\Friendica\DI::page()->registerStylesheet(__DIR__ . '/relative/path/to/addon/stylesheet.css');
}
...
}
-function <addon>_footer(App $a)
+function <addon>_footer()
{
\Friendica\DI::page()->registerFooterScript(__DIR__ . '/relative/path/to/addon/script.js');
}
### JavaScript hooks
The main Friendica script provides hooks via events dispatched on the `document` property.
-In your Javascript file included as described above, add your event listener like this:
+In your JavaScript file included as described above, add your event listener like this:
```js
document.addEventListener(name, callback);
- *name* is the name of the hook and corresponds to a known Friendica JavaScript hook.
- *callback* is a JavaScript anonymous function to execute.
-More info about Javascript event listeners: https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener
+More info about JavaScript event listeners: https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener
#### Current JavaScript hooks
DI::args()->get(2); // = 'arg2'
```
-To display a module page, you need to declare the function `<addon>_content(App $a)`, which defines and returns the page body content.
-They may also contain `<addon>_post(App $a)` which is called before the `<addon>_content` function and typically handles the results of POST forms.
-You may also have `<addon>_init(App $a)` which is called before `<addon>_content` and should include common logic to your module.
+To display a module page, you need to declare the function `<addon>_content()`, which defines and returns the page body content.
+They may also contain `<addon>_post()` which is called before the `<addon>_content` function and typically handles the results of POST forms.
+You may also have `<addon>_init()` which is called before `<addon>_content` and should include common logic to your module.
## Templates
### logged_in
Called after a user has successfully logged in.
-`$b` contains the `$a->user` array.
+`$b` contains the `App->user` array.
### display_item
Called when formatting a post for display.
##### With multiple submit buttons
```php
$data = [
- 'addon' => 'catavar',
+ 'addon' => 'catavatar',
'title' => DI::l10n()->t('Cat Avatar Settings'),
'html' => $html,
'submit' => [
### profile_advanced
Called when the HTML is generated for the Advanced profile, corresponding to the Profile tab within a person's profile page.
`$b` is the HTML string representation of the generated profile.
-The profile array details are in `$a->profile`.
+The profile array details are in `App->profile`.
### directory_item
Called from the Directory page when formatting an item for display.
### home_content
Called prior to output home page content, shown to unlogged users.
-`$b` is the HTML sring of section region.
+`$b` is the HTML string of section region.
### contact_edit
Called when editing contact details on an individual from the Contacts page.
### footer
Called after HTML content functions have completed.
-Deferred Javascript files should be registered using this hook.
+Deferred JavaScript files should be registered using this hook.
`$b` is (string) HTML of footer div/element.
### avatar_lookup