Show Stylesheet only on Plugin page WordPress - php

Question

I have a lot of CSS scripts in my WordPress plugin which may affect the other WordPress tags, such as form as an example:
.form {
padding:30px;
background-color:#fff;
}
I can change the CSS, but I want to have a script which only allows the stylesheet to show on the plugin page.
So to clear it up, currently the stylesheet <link> is always in the source code of the admin panel, but I want a script which only puts the stylesheet <link> in the source code when the user is on the plugin page.

Answer 1

You can use get_current_screen:
$screen = get_current_screen();
if ( $screen->id == 'your_plugin_page' ) ){
$custom_css = ".form {.....}";
wp_add_inline_style( 'your_main_style_handle', $custom_css );
}
Update 1:
To add a submenu to your admin menu:
add_action( 'admin_menu', 'your_plugin_admin_menu' );
//Add this to register you styles
add_action( 'admin_init', 'your_plugin_admin_init' );
then:
/**
* Register your stylesheet.
*/
function wpdocs_plugin_admin_init() {
wp_register_style('your-style', plugins_url('scripts/jquery-ui.css',__FILE__ ));
wp_register_script( 'jquery-ui', plugins_url('scripts/jquery-ui.js',__FILE__ ));
}
/**
* Register your plugin page and hook stylesheet loading.
*/
function your_plugin_admin_menu() {
$page = add_submenu_page(...., 'your_plugin_manage_menu' );
//Call 'your_plugin_admin_styles' only on the plugin’s options page
add_action( "admin_print_styles-{$page}", 'your_plugin_admin_styles');
}
/**
* Enqueue our stylesheet.
*/
function your_plugin_admin_styles() {
wp_enqueue_style('your-style');
wp_enqueue_script('jquery-ui');
$custom_css = ".form {.....}";
wp_add_inline_style( 'your-style', $custom_css );
}
/**
* Output our admin page.
*/
function your_plugin_manage_menu() {
// ...
}

Answer 2

you can create style-sheet, and create hook for that style-sheet reference. Then you can add WordPress using add_action(), within plugin call, where you like to call that script. So it will be referenced at head of page for on specified page as needed.
Read more on
https://developer.wordpress.org/reference/functions/wp_enqueue_script/
https://developer.wordpress.org/reference/functions/add_action/