DOM custom events are events created by developers to trigger specific actions or behaviors in JavaScript code. These events are defined by developers and can be triggered by code, unlike standard DOM events that are built into the browser and triggered by user actions or the browser itself.
Custom events are created by using the 'CustomEvent()' constructor. It has two parameters, eventType and options, an object that has the detail property that contains any custom information about the event. After creating a custom event, you need to attach the event to a DOM element and trigger it by using the 'dispatchEvent()' method.
The use of custom events allows for you to decouple the code that you want to execute after another piece of code completes. An example being that you can separate the event listeners in a seperate script. You could also have multiple event listeners to the same custom event. Custom events are great for testing. By using custom events in a testing environment, developers can ensure their code behaves as expected.
Custom events are created by developers to trigger specific actions or behaviors in JavaScript code. Custom events allow developers to decouple code, separate event listeners, and perform testing to ensure expected behavior.