Using jQuery .on() and .off()

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Select2 is licensed under MIT. Select2 will trigger a few different events when different actions are taken using the component, allowing you to add custom hooks and perform actions. You may also manually trigger these events on a Select2 control using. Jquery select option event handler can attach to them using the.

Any additional data for the selection that was provided in the data source will be included in this object as well. You can jquery select option event handler trigger events on a Select2 control using the jQuery trigger method. However, if you want to pass some data to any handlers for the event, you need to construct a new jQuery Event object and trigger jquery select option event handler that:.

It's common for other components to be listening to the change event, or for custom event handlers to be attached that may have side effects. To limit the scope to only notify Select2 of the change, use the. Select2 has an internal event system that jquery select option event handler independently of the DOM event system, allowing adapters to communicate with each other.

This internal event system is only accessible from plugins and adapters that are connected to Select2 - not through the jQuery event system. You can find more information on the public events triggered by individual adapters in the advanced chapter. Getting Started Installation Basic usage Builds and modules 2. Troubleshooting Getting Help Common problems 3. Data sources The Select2 data format Ajax remote data Arrays 7. Dynamic option creation Programmatic control Add, select, or clear items Retrieving selections Methods Events Upgrading What's new in 4.

Docs maintained by Alexander Weissman. Getting Started Programmatic control Events. Events Select2 will trigger a few different events when different actions are taken using the component, allowing you to add custom hooks and perform actions. Event Description change Triggered whenever an option is selected or removed. See below for more details. This event can be prevented. However, if you want to pass some data to any handlers for the event, you need to construct a new jQuery Event object and trigger on that: Scoped version of change.

Triggered whenever the dropdown is closed. Triggered whenever the dropdown is opened. Triggered whenever a result is selected. Triggered whenever a selection is removed.

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With the release of jQuery 1. Like everything in jQuery, the official documentation for. The on event handler is designed to replace both the. It looks like this:. If you are currently using. This has the added benefit of allowing you to remove individual handlers later on using.

This was useful functionality for pages that dynamically generate or load content, but this method has been considered bad practice for some time now.

There are a number of problems with. Unfortunately there are still a large number of developers using. So what should you use instead for dynamically generated content? You should delegate your handlers using the new. This will attach your event to any anchors within the div container element, reducing the scope of having to check the whole document element tree and increasing efficiency.

Please note - the narrower your selector matches are, the more efficient your code will be. Although this example uses an anchor, try to avoid attaching a handler to every anchor.

It is better to give a class or id where possible. If you were using. If you wanted to remove a particular handler and you have created a separate handler function you can use:. As you are no longer using. As with live , die has been deprecated. I hope this article has provided a good starter and encouraged you to investigate these new additions.

Andi Smith is a web developer from London, United Kingdom. He likes to build highly performant websites which innovate with genuine value. Home About Blog Contact. It looks like this: