I must to add new options and functions in post pages in admin panel. I call a new function in edit-form-advanced.php and edded this function in template.php file. The question is this wrong? Becouse my function is in one file with functions on wordpress. Or maybe must be in other file? but where i must call it?
For wp-content part i know and i make a child theme of parent theme, but i do not know what to do when i must add code in wp-admin part.
example:
edit-form-advanced.php
do_custom_boxes( null, $post );
and in template.php
function do_custom_boxes( $screen, $object ) {
global $wpdb;
$appTable = $wpdb->prefix . "post_panel";
$query = $wpdb->prepare("SELECT * FROM $appTable WHERE post_id = ".$_GET['post']." ", $screen);
$applications = $wpdb->get_results($query);
......
}
Short answer: Yes, it's wrong to do so. Whenever you update your WordPress you'll loose all your changes.
WordPress allows you to hook into its code, modify its behavior and many things.
Please read about actions and filters.
Basically, Actions allow you to fire a function when something happens in WordPress.
For example:
<?php
function do_something_when_admin_pages_init() {
// Do something here
}
add_action('admin_init', 'do_something_when_admin_pages_init')
Filters allow you to modify data/output of another function. It's like it let you step in the middle, do something with the data and then continue.
Example from the WordPress page:
<?php
function wporg_filter_title($title) {
return 'The ' . $title . ' was filtered';
}
add_filter('the_title', 'wporg_filter_title');
This modifies the title before it's printed.
So with those two ways of 'hooking' into the WordPress code, you can write your code in your theme's functions.php file, or write a Plugin (it's up to you).
Related
I have the following code in my plugin file:
// SET UP REWITE RULES FOR LISTING PERMALINKS //
function my_rewrite_tags() {
add_rewrite_tag('%listingId%', '([^&]+)');
}
add_action('init', 'my_rewrite_tags', 10, 0);
function my_rewrite_rules() {
add_rewrite_rule('^listing/([^/]*)/?','index.php?pagename=listing&listingId=$matches[1]','top');
}
add_action('init', 'my_rewrite_rules', 10, 0);
This idea is that I have a page called "Listing" with the permalink "listing" and I want to be able to have the listing's ID number after it (i.e., /listing/12345/)
I then have a shortcode running on the "Listing" page
// SHORTCODE FOR SINGLE LISTING PAGE //
function my_single_listing(){
ob_start();
include('templates/single-listing.php');
return ob_get_clean();
}
add_shortcode('listing','my_single_listing');
...and the first thing it does is try to get that listing ID with the code:
$listingId = $wp_query->query_vars['listingId'];
I've done this with other plugins I've written in the past, but in this case it's decided to not work. In fact, if I enter the code:
print_r($wp_query);
I get absolutely nothing returned from it at all. (All other content on the page is displaying fine though.)
Any ideas?
Your issue with $wp_query being blank might be due to it not being accessed as a global variable. Prefacing it with a global declaration will allow it to access the global query:
global $wp_query;
print_r( $wp_query )
The issue with the listing ID not being picked up has to do with it not being declared as a possible custom query var. WordPress requires you to declare them before it loads them into the global wp_query for the page (presumably for security). $_GET was able to access them since that bypasses WordPress and just uses it with PHP.
function so_71685702_add_query_vars( $query_vars ) {
$query_vars[] = 'listingId';
return $qvars;
}
add_filter( 'query_vars', 'so_71685702_add_query_vars' );
Once you've got that, $wp_query->query_vars( 'listingid' ) should return a value.
Here's the query_vars hook information page, and the get_query_var hook information page which might be useful for further reading - might cover some things you'll run into based on the way you're setting up custom rewrites and query vars.
I am new to WordPress.org and I figured out that I can add HTML, CSS and Javascript to a page via a code block. But my question is, can I also make a call to the WordPress database from a page? Or do I need to make a plugin for that?
You can do this with a shortcode that calls a php function in your (child-themes) functions.php.
This is a good guide to start from:
https://www.wpbeginner.com/wp-tutorials/how-to-add-a-shortcode-in-wordpress/
// function that runs when shortcode is called
function wpb_demo_shortcode() {
// Things that you want to do.
$message = 'Hello world!';
// Output needs to be return
return $message;
}
// register shortcode
add_shortcode('greeting', 'wpb_demo_shortcode');
And then call it within your post/page (in a Gutenberg shortcode block)
[greeting]
This is a good way because you can re-use and maintain it easily.
Tom
Using page you can call database you can do it using
Creating a template and assign that template in wordpress page
Or you can create short code in function.php and add shortcode in your wordpress page
Create page template
1) Create file in your theme folder and name it 'custom.php' you can name it anything.
2) Open file and add this
3) Start editing in that page you can call database using
global $wpdb;
$result = $wpdb->get_results('SELECT * FROM wp_posts LIMIT 10');
4) After editing 'custom.php' you can assign this template in your custom page
note: please refer this link to know more about page template
https://www.cloudways.com/blog/creating-custom-page-template-in-wordpress/
Create short code in function.php
1) You can create shortcode using
// function that runs when shortcode is called
function wpb_demo_shortcode() {
global $wpdb;
$result = $wpdb->get_results('SELECT * FROM wp_posts LIMIT 10');
return $result;
}
// register shortcode
add_shortcode('get_post_shortcode', 'wpb_demo_shortcode');
2) you can call shortcode in any page of wordpress.
<?php echo do_shortcode("[get_post_shortcode]"); ?>
I am having a bit of trouble here understanding how to do the following. I have searched for weeks now but cannot seem to find what I am looking for.
I have a custom post type 'product' and want to change which template gets loaded for the single product page as well as the archive for the products. I am using the following code to load include and load templates.
add_filter('template_include', function() {
if (is_post_type_archive('product')) {
$templatefilename = 'archive-product.php';
$template = WPVS_PATH . 'templates/' . $templatefilename;
return $template;
}
if ('product' == get_post_type() ){
$templatefilename = 'single-product.php';
$template = WPVS_PATH . 'templates/' . $templatefilename;
return $template;
}
});
The problem I am having is that it replaces the current theme's template instead of just the inner part of the content and archive areas.
Here is what I want to achieve:
Create a custom post type 'product' in a plugin - DONE (Was kinda easy!)
When opening a single product only change the content part. - I can do this with the_content filter hook. Simple enough. Any other suggestions is welcome.
When I go to the archive view for the 'product' custom post type I don't want to have it load the theme's default archive (list) view but instead a grid view from my plugin which I cannot seem to get right. I only want to change the inner part of the template, not the whole page.
I have created this plugin a few weeks ago using only shortcodes which works good but want to see if I can do it without the use of shortcodes by means of creating the custom post type and changing the inner template parts of the current active theme.
Can anybody steer me into the right direction here?
If I create a theme I can do what I am looking for but I want to create this into a plugin instead without adding or making changes to the active theme. The plugin should handle what is needed.
The same issue is discussed here but what I want is to develop something that is theme independent. No changes should be made in theme files and no theme files should be copied to the plugin.
WP - Use file in plugin directory as custom Page Template?
Recently I also had the same problem. Here's how I worked it out.
template_include filter accepts a parameter which is the selected template that you want to override (this what you are missing in your code).
I don't know but sometimes the filter hook need higher priority to work like 9999. But first check if it work with default priority, if don't change it.
I assume your both archive and single product template both have include get_header() and get_footer() which can be used for default selected theme (Or if the theme has different setup, setup accordingly).
This is simplified code:
add_filter('template_include', function($default_template) {
if (is_post_type_archive('product')) {
$templatefilename = 'archive-product.php';
$template = WPVS_PATH . 'templates/' . $templatefilename;
$default_template = $template;
} else if ('product' == get_post_type() ) {
$templatefilename = 'single-product.php';
$template = WPVS_PATH . 'templates/' . $templatefilename;
$default_template = $template;
}
// Load new template also fallback if both condition fails load default
return $default_template;
}, 9999); // set priority, only if not worked with default one
The best option in this case is to provide a shortcode to the user. So they can place it on any page that they want (or that you auto generate). That way you will place your content inside their theme.
Something like this:
add_shortcode( 'slotsl-game', 'embed_game' );
/**
* Print the game
* #return false|string
*/
function embed_game(){
ob_start();
$game = get_post();
include_once SLOTSL_PLUGIN_DIR . 'templates/slotsl-single-game.php';
return ob_get_clean();
}
is there a way (plugin) to insert html/css/images ect.. automatically into every wordpress post? most of my posts are going to be very similar so is there a plugin that will automatically insert the pre written html/css/ ect in every post as opposed to me entering it manually every time.
Thank you in advance ;-)
You can write your own simple function for this, see my example below:
add_filter( 'default_content', 'my_editor_content' );
function my_editor_content( $content ) {
global $post_type;
if( $post_type == 'post') { /* Or your custom post type, pages etc. */
$content = 'Your custom HTML/CSS content here';
}
return $content;
}
Place this in functions.php and it will be the default content of every new post/page/custom post type you create.
For a list of available post types, please refer to the Codex
You could use a plugin such as Ad injection, it will allow you to do what you need without having to alter / amend / ad any code to the templates or files
I am writing a plugin that will take advantage of other plugin's features (think about a plugin for a plugin).
My file lies in /plugins/new-plugin/new-plugin.php
and I need to make a
include(/plugins/OLD_plugin/old-plugin.php)
so I can use a couple of functions from the old-plugin.php file.
What is the correct way to do this? I could maybe make the functions in old-plugin.php available globally, but I don't want to change the old-plugin.php file.
I've already tried several ways to do this, but none worked. The new-plugin will only show some info in an options page, not viewable for the general public and does not interact with any public page or post in my site.
I've already tried $_SERVER, WP_PLUGIN_DIR, WP_CONTENT_DIR, the absolute server path, relative paths and even some black magic, but nothing seems to work good.
With some of this solutions the plugin's options page shows good but the blog's pages do not render. With other solutions the inverse happens, and with some other solutions nothing even render, be it admin pages or blog's pages, all with errors regarding to file not found.
The new-plugin.php is as simple as
<?php
/*
WP Common Headers
*/
global $wpdb;
if ( ! defined( 'WP_CONTENT_DIR' ) )
define( 'WP_CONTENT_DIR', ABSPATH . 'wp-content' );
if ( ! defined( 'WP_PLUGIN_DIR' ) )
define( 'WP_PLUGIN_DIR', WP_CONTENT_DIR . '/plugins' );
include '/server-absolute-path/public_html/gameblogs/wp-content/plugins/old-plugin/old-plugin.php';
add_action('admin_menu', 'new_plugin_menu');
function new_plugin_menu() {
$page_title = 'New Plugin';
$menu_title = 'New Plugin';
$function = 'new_plugin_admin_page';
$menu_slug = 'new_plugin';
add_menu_page($page_title, $menu_title, 0, __FILE__, $function);
}
function new_plugin_admin_page() {
$result = old_plugin_link_data(" WHERE link_destination NOT LIKE '/%' AND link_destination NOT LIKE '%gameblogs%'");
$total = count($result);
old_plugin_list_links($result, $total, FALSE, FALSE);
*/
}
?>
thanks for any ideas!
check the old plugin files and see if there are any do_actions or apply_filters in it. If there are then you can hook into the old plugin script with your new plugin using add_action and apply_filters and execute other things you want to do.
see http://codex.wordpress.org/Function_Reference/do_action
and http://codex.wordpress.org/Function_Reference/apply_filters
For example (very basic example):
If in old plugin you find a:
do_action('some_type_of_reference);`
In your new plugin you can hook into it by doing:
`add_action('some_type_of_reference', 'name_of_my_function');
function name_of_my_function() {
//executed code here
}`
If in old plugin you find a:
apply_filters('some_type_of_reference', $variable);
Then in your new plugin you can hook into the filter by doing:
apply_filter('some_type_of_reference', 'my_function');
function my_function( $variable ) {
//act on the variable from the filter.
return $variable;
}
Have you looked at the plugins_url function? I haven't had an in-depth read through your code, but it might help.
The plugins_url template tag retrieves the url to the plugins directory or to a specific file within that directory. You can hardcode the plugin slug in $path or pass FILE as a second argument to get the correct folder name.
Hope this helps!