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Timeline Lazy loading of events

Timeline supports lazy loading of events during moving / zooming in the timeline. This makes sense when event's loading is time-consuming. Events are loaded lazy when p:ajax with event="lazyload" is attached to the p:timeline tag. The event class TimelineLazyLoadEvent contains one or two time ranges the events should be loaded for (two times ranges occur when you zoom out the timeline).

Note: The "lazyload" listener is not invoked again when the visible time range (incl. some hidden ranges defined by preloadFactor) already has lazy loaded events.


<div class="card">
    <h:form id="form">
        <p:growl id="growl" showSummary="true" showDetail="false">
            <p:autoUpdate/>
        </p:growl>

        <div id="loadingText" style="font-weight:bold; margin:-5px 0 5px 0; visibility:hidden;">Loading ...
        </div>

        <p:timeline id="timeline" value="#{lazyTimelineView.model}"
                    preloadFactor="#{lazyTimelineView.preloadFactor}"
                    zoomMax="#{lazyTimelineView.zoomMax}" minHeight="170">
            <p:ajax event="lazyload" update="@none" listener="#{lazyTimelineView.onLazyLoad}"
                    onstart="$('#loadingText').css('visibility', 'visible')"
                    oncomplete="$('#loadingText').css('visibility', 'hidden')"/>
        </p:timeline>

        <h:panelGrid columns="2" style="margin-top:15px">
            <p:spinner id="spinner" value="#{lazyTimelineView.preloadFactor}"
                       min="0" max="1" stepFactor="0.05"/>
            <p:commandButton value="Update Preload Factor" process="@this spinner" update="timeline"
                             action="#{lazyTimelineView.clearTimeline}"
                             style="margin-left:5px"/>
        </h:panelGrid>
    </h:form>
</div>