How to Partially Reload a ui:repeat Component in JSF?

What are the best practices to partially reload a ui:repeat component in JSF?

<h:form id="myForm">
    <ui:repeat value="#{myBean.items}" var="item">
        <h:outputText value="#{item.name}" />
    </ui:repeat>
    <h:commandButton value="Refresh" action="#{myBean.refreshItems}" update="myForm" />
</h:form>

Partially reloading a `ui:repeat` component in JavaServer Faces (JSF) is essential for improving performance and user experience without needing a full page refresh. This process can be efficiently achieved using AJAX capabilities provided by JSF.

<h:form id="myForm">
    <ui:repeat value="#{myBean.items}" var="item">
        <h:outputText value="#{item.name}" />
    </ui:repeat>
    <h:commandButton value="Refresh" action="#{myBean.refreshItems}">
        <f:ajax render="@form" /> <!-- Only refreshes content in the form -->
    </h:commandButton>
</h:form>

Causes

• Dynamic content updates require refreshing only part of the user interface.
• Full page reloads can degrade performance and disrupt user experience.

Solutions

• Use the `<h:commandButton>` with the `update` attribute specified to target the `ui:repeat` component directly.
• Implement AJAX capabilities with the use of `<f:ajax>` within your component to refresh the specific area on client actions.

Mistake: Not specifying the correct update ID, leading to the wrong component being refreshed.

Solution: Ensure that the `update` attribute correctly references the ID of the `ui:repeat` or enclosing form.

Mistake: Forgetting to include `<f:ajax>` for AJAX communication, resulting in full-page reload.

Solution: Incorporate `<f:ajax>` tags to enable AJAX calls, thus allowing partial page rendering.