How Can I Trigger a JSF Managed Bean from a Native JavaScript HTML DOM Event?

Invoking a JSF Managed Bean on a HTML DOM Event Using Native JavaScript

Manipulating JavaServer Faces managed beans during HTML DOM events using native JavaScript can be achieved through various methods. While jQuery offers an easy solution with its $(document).ready() function, JSF provides different approaches that integrate seamlessly with its framework.

Using h:commandScript (JSF 2.3)

The component enables executing bean actions within JavaScript without relying on an external library like jQuery. It creates a JS function that can be invoked manually or automatically during the DOM load event by setting autorun="true". For example:

<form>
    <commandscript name="commandName" action="#%7Bbean.action%7D" render=":results" autorun="true"></commandscript>
</form>

Using p:remoteCommand (PrimeFaces)

PrimeFaces provides , a component that seamlessly integrates with its jQuery-based Ajax engine. Compared to , it uses jQuery to trigger the Ajax request.

<form>
    <remotecommand name="commandName" action="#%7Bbean.action%7D" update=":results" autorun="true"></remotecommand>
</form>

Using o:commandScript (OmniFaces)

If your application utilizes OmniFaces, you can substitute with , which offers identical functionality but is compatible with older JSF 2.x versions.

<form>
    <commandscript name="commandName" action="#%7Bbean.action%7D" render=":results" autorun="true"></commandscript>
</form>

Hidden Form Trick

Another option involves a "hidden form" trick, where a form containing a command button is rendered on the page but hidden using CSS. The button can be triggered using JavaScript's onclick() method.

<form></form>

document.getElementById("form:button").onclick();

Custom UIComponent

For advanced scenarios, you can create a custom UIComponent extending UICommand that generates JSF's native jsf.ajax.request() call. This approach provides full customization and control over the Ajax behavior.

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