All the js files in a particular plugin must be registered for it to have effect on the plugin. The file that register the js file is ‘loader.php’ located inside the plugin.
If for example the plugin name is ‘test’, to register a js file for test plugin, go to ‘loader.php’ in the test plugin directory and enter the following code (assuming the js filename is ‘test.js’):
The test:: is the name of the plugin in which the js folder is located.
The js/ is the js folder
The test.js is the js filename.
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