Add Admin JavaScript Plugin

Ever want to introduce custom dynamic functionality to your WordPress admin pages and otherwise harness the power of JavaScript? Any modification you may want to do with JavaScript can be facilitated via this plugin.

Using this plugin you’ll easily be able to define additional JavaScript (inline and/or by URL) to be added to all administration pages. You can define JavaScript to appear inline in the admin head, admin footer (recommended), or in the admin footer within a jQuery jQuery(document).ready(function($)) {} section, or reference JavaScript files to be linked in the page header. The referenced JavaScript files will appear in the admin head first, listed in the order defined in the plugin’s settings. Then any inline admin head JavaScript is added to the admin head. All values can be filtered for advanced customization (see Filters section).

Links: Plugin Homepage | Plugin Directory Page | GitHub | Author Homepage

Hooks

The plugin exposes four filters for hooking. Typically, code making use of filters should ideally be put into a mu-plugin or site-specific plugin (which is beyond the scope of this readme to explain). Bear in mind that most of the features controlled by these filters are configurable via the plugin’s settings page. These filters are likely only of interest to advanced users able to code.

c2c_add_admin_js_files (filter)

The ‘c2c_add_admin_js_files’ filter allows programmatic modification of the list of JavaScript files to enqueue in the admin.

Arguments:

• $files (array): Array of JavaScript files.

Example:

/** * Adds a JavaScript file to be enqueued in the WP admin. * * @param array $files Array of files. * @return array */ function my_admin_js_files( $files ) { $files[] = 'http://ajax.googleapis.com/ajax/libs/yui/2.8.1/build/yuiloader/yuiloader-min.js'; return $files; } add_filter( 'c2c_add_admin_js_files', 'my_admin_js_files' ); 

c2c_add_admin_js_head (filter)

The ‘c2c_add_admin_js_head’ filter allows customization of the JavaScript that should be added directly to the admin page head.

Arguments:

• $js (string): JavaScript code (without <script> tags).

Example:

/** * Adds JavaScript code to be added to the admin page head. * * @param string $js JavaScript code. * @return string */ function my_add_head_js( $js ) { $js .= "alert('Hello');"; return $js; } add_filter( 'c2c_add_admin_js_head', 'my_add_head_js' ); 

c2c_add_admin_js_footer (filter)

The ‘c2c_add_admin_js_footer’ filter allows customization of the JavaScript that should be added directly to the admin footer.

Arguments:

• $js (string): JavaScript code (without <script> tags).

Example:

/** * Adds JavaScript code to be added to the admin footer. * * @param string $js JavaScript code. * @return string */ function my_add_footer_js( $js ) { $js .= "alert('Hello');"; return $js; } add_filter( 'c2c_add_admin_js_footer', 'my_add_footer_js' ); 

c2c_add_admin_js_jq (filter)

The ‘c2c_add_admin_js_jq’ filter allows customization of the JavaScript that should be added directly to the admin footer within a jQuery document ready function.

Arguments:

• $jq_js (string): JavaScript code (without <script> tags or jQuery document ready function).

Example:

/** * Adds jQuery code to be added to the admin footer. * * @param string $jq_js jQuery code. * @return string */ function my_add_jq( $js_jq ) { $js_jq .= "$('.hide_me').hide();"; return $js_jq; } add_filter( 'c2c_add_admin_js_jq', 'my_add_jq' ); 

1. Install via the built-in WordPress plugin installer. Or download and unzip add-admin-javascript.zip inside the plugins directory for your site (typically wp-content/plugins/)
2. Activate the plugin through the ‘Plugins’ admin menu in WordPress
3. Go to “Settings” -> “Admin JavaScript” and add some JavaScript to be added into all admin pages. (You can also use the “Settings” link in the plugin’s entry on the admin “Plugins” page).

1. 

   A screenshot of the plugin's admin settings page.

2.0 (2021-05-08)

Highlights:

This recommended minor release updates its plugin framework, restructures unit test files, notes compatibility through 5.7+, and minor behind-the-scenes tweaks.

Details:

• Change: Outright support HTML5 rather than check for theme support of HTML5, since that isn’t relevant to admin
• Change: Update plugin framework to 061
  • 061:
  • Fix bug preventing settings from getting saved
  • 060:
  • Rename class from c2c_{PluginName}_Plugin_051 to c2c_Plugin_060
  • Move string translation handling into inheriting class making the plugin framework code plugin-agnostic
    • Add abstract function get_c2c_string() as a getter for translated strings
    • Replace all existing string usage with calls to get_c2c_string()
  • Handle WordPress’s deprecation of the use of the term “whitelist”
    • Change: Rename whitelist_options() to allowed_options()
    • Change: Use add_allowed_options() instead of deprecated add_option_whitelist() for WP 5.5+
    • Change: Hook allowed_options filter instead of deprecated whitelist_options for WP 5.5+
  • New: Add initial unit tests (currently just covering is_wp_version_cmp() and get_c2c_string())
  • Add is_wp_version_cmp() as a utility to compare current WP version against a given WP version
  • Refactor contextual_help() to be easier to read, and correct function docblocks
  • Don’t translate urlencoded donation email body text
  • Add inline comments for translators to clarify purpose of placeholders
  • Change PHP package name (make it singular)
  • Tweak inline function description
  • Note compatibility through WP 5.7+
  • Update copyright date (2021)
  • 051:
  • Allow setting integer input value to include commas
  • Use number_format_i18n() to format integer value within input field
  • Update link to coffee2code.com to be HTTPS
  • Update readme_url() to refer to plugin’s readme.txt on plugins.svn.wordpress.org
  • Remove defunct line of code
• Change: Prevent appending newline to value of setting passed to filter unless an actual value was configured
• Change: Add separator character between merged strings used for the script handle when enqueuing
• Change: Move translation of all parent class strings into main plugin file
• Change: Tweak conditional checks to be more succinct
• Change: Ensure there’s a current screen before attempting to get one of its properties
• Change: Note compatibility through WP 5.7+
• Change: Update copyright date (2021)
• Change: Tweak some inline function documentation
• Unit tests:
  • New: Add tests for JS files getting registered and enqueued
  • New: Add tests for add_codemirror()
  • Change: Restructure unit test directories and files into tests/ top-level directory
  • Change: In bootstrap, store path to plugin file constant so its value can be used within that file and in test file

1.9.1 (2020-09-26)

• Change: Update plugin framework to 051
  • Allow setting integer input value to include commas
  • Use number_format_i18n() to format integer value within input field
  • Update link to coffee2code.com to be HTTPS
  • Update readme_url() to refer to plugin’s readme.txt on plugins.svn.wordpress.org
  • Remove defunct line of code
• Change: Note compatibility through WP 5.5+
• Change: Restructure unit test file structure
  • New: Create new subdirectory phpunit/ to house all files related to unit testing
  • Change: Move bin/ to phpunit/bin/
  • Change: Move tests/bootstrap.php to phpunit/
  • Change: Move tests/ to phpunit/tests/
  • Change: Rename phpunit.xml to phpunit.xml.dist per best practices
• Change: Add missing changelog entry for v1.9 release into readme.txt

1.9 (2020-06-26)

Highlights:

This minor release updates its plugin framework, adds a TODO.md file, updates a few URLs to be HTTPS, expands unit testing, updates compatibility to be WP 4.9 through 5.4+, and minor behind-the-scenes tweaks.

Details:

• Change: Change class names used for admin notice to match current WP convention
• Change: Update plugin framework to 050
  • Allow a hash entry to literally have ‘0’ as a value without being entirely omitted when saved
  • Output donation markup using printf() rather than using string concatenation
  • Update copyright date (2020)
  • Note compatibility through WP 5.4+
  • Drop compatibility with version of WP older than 4.9
• New: Add TODO.md and move existing TODO list from top of main plugin file into it (and add more items to it)
• Change: Tweak help text for ‘files’ setting for better phrasing and to remove extra sentence spaces
• Change: Note compatibility through WP 5.4+
• Change: Drop compatibility for version of WP older than 4.9
• Change: Update links to coffee2code.com to be HTTPS
• Unit tests:
  • New: Add tests for options_page_description()
  • New: Add test for default hooks
  • New: Add tests for setting and query param names
  • New: Label groupings of tests
  • Change: Remove unnecessary unregistering of hooks in tearDown()
  • Change: Move test_turn_on_admin() until just before first needed now that other tests can run before it
  • Change: Store plugin instance in class variable to simplify referencing it
  • Change: Use HTTPS for link to WP SVN repository in bin script for configuring unit tests (and delete commented-out code)

Full changelog is available in CHANGELOG.md.