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FileDownload

FileDownload is used to stream binary contents like files stored in database to the client. FileDownload is used by attaching it to any Faces command component like button or a link. Additionally, presentation of download can be configured with the contentDisposition attribute that takes either "attachment" or "inline" as a value. When "inline" is used, the browser tries to open the file within itself if supported instead of downloading. Use "inline" together with the attribute store="true" to make sure that the opened file is proposed to be saved with its original name if the opened file shall be saved. Otherwise, Chrome and Edge, will use the screen's name as default for the file save.

FileDownload Tag Documentation

Traditionally, dynamic binary data was presented to the client by writing a servlet or filter to stream the data. FileDownload simplifies this process.

NameTypeRequiredDefaultDescription
value Object true A streamed content instance.
contentDisposition String false attachment Specifies display mode (non-ajax), valid values are "attachment" and "inline".
monitorKey String false Defines setting cookie key for monitorDownload method on client side.
store Boolean false Controls the 'no-store' attribute on the cache control header. Default false is to include 'no-store'.
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Usage


<script>
    //<![CDATA[
    function start() {
        PF('statusDialog').show();
    }

    function stop() {
        PF('statusDialog').hide();
    }
    //]]>
</script>

<div class="card">
    <p:dialog modal="true" widgetVar="statusDialog" header="Status" draggable="false" closable="false"
              resizable="false">
              <i class="pi pi-spinner pi-spin" style="font-size:3rem"></i>
    </p:dialog>

    <h:form>
        <p:commandButton value="Download" ajax="false" onclick="PrimeFaces.monitorDownload(start, stop);"
                         icon="pi pi-arrow-down" styleClass="mr-2">
            <p:fileDownload value="#{fileDownloadView.file}"/>
        </p:commandButton>

        <p:commandButton value="Inline Download" ajax="false" onclick="PrimeFaces.monitorDownload(start, stop);"
                         icon="pi pi-arrow-down" styleClass="mr-2">
            <p:fileDownload value="#{fileDownloadView.file}" contentDisposition="inline" store="true" />
        </p:commandButton>

        <p:commandButton value="Ajax Download" icon="pi pi-arrow-down" styleClass="ui-button-outlined">
            <p:fileDownload value="#{fileDownloadView.file}"/>
        </p:commandButton>
    </h:form>
</div>
PrimeFaces v17.0.0-SNAPSHOT