How to Invoke JSF Managed Beans on HTML DOM Events Using JavaScript?

Invoking JSF Managed Bean on HTML DOM Event using Native JavaScript

In web development, it becomes necessary to execute server-side actions based on specific events occurring on the client-side. This is achievable in JavaServer Faces (JSF) by employing various approaches. One such approach is to invoke a JSF managed bean action method using Ajax during an HTML DOM load event.

JSF 2.3's

In JSF 2.3 and above, the component provides a direct solution:

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

This script can be invoked using plain JavaScript:

commandName();

Setting autorun="true" triggers it during DOM load.

PrimeFaces

If PrimeFaces is utilized, consider employing its :

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

Invocation is similar to :

commandName();

PrimeFaces uses jQuery for AJAX calls, not JSF native jsf.ajax.request().

OmniFaces

For JSF versions older than 2.3, OmniFaces offers , which serves the same purpose as :

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

Simply replace h:commandScript with o:commandScript.

'Hidden Form' Trick

An alternative approach involves utilizing a hidden form with a :

<form></form>

Invocation:

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

Custom UIComponent

As a last resort, one can develop a custom UIComponent that extends UICommand and leverages jsf.ajax.request().

In summary, these approaches empower developers to invoke JSF managed beans on HTML DOM events using native JavaScript. The choice of method depends on factors such as JSF version, library usage, and project constraints.

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