Is there a simple way to allow a user to download the files in selected documents from a viewPanel?

问题

I have a portal where users sign in and see a bunch of documents sorted and categorized by year then category. They want a check box next to each document so they can select one or many documents then press a button to download all the files from the selected documents.

There is only one file per document.

Is there an easy way to program such a thing?

回答1:

You want to download attachments from selected documents all at once.

Create a zip file which contains all attachments and download the one zip file.

You can find the code for creating a zip file from document's attachments in Naveen Maurya's XSnippet.

Extend this code in a way that you run through all selected documents and grab the attachments from there.

Set a session scope variable with the the Ids of all selected documents in your XPage's button and open XPage zip.xsp (XSnippet's XAgent)

<xp:button
    id="button1"
    value="Download">
    <xp:eventHandler
        event="onclick"
        submit="true"
        refreshMode="norefresh">
        <xp:this.action>
            <xp:actionGroup>
                <xp:executeScript>
                    <xp:this.script><![CDATA[#{javascript:
                        var viewPanel = getComponent("viewPanel1");
                        sessionScope.selectedIds = viewPanel.getSelectedIds();
                        }]]></xp:this.script>
                </xp:executeScript>
                <xp:openPage name="/zip.xsp"></xp:openPage>
            </xp:actionGroup>
        </xp:this.action>
    </xp:eventHandler>
</xp:button>

Read the Ids from session scope in zip.xsp, get the documents and their attachments and put them all in one zip file.

...
var selectedIds = sessionScope.selectedIds;
for(i=0; i < selectedIds.length; i++) {
    var doc:NotesDocument = database.getDocumentByID(selectedIds[i]);
    var attachments:java.util.Vector = session.evaluate("@AttachmentNames", doc);
    // Loop through all the attachments
    for (var i = 0; i < attachments.size(); i++) {
        ...

As an alternative, you can download all files at once with multiple window.open(url) on client side:

collect all attachment's URLs on server side
write those in a hidden input field
execute CSJS code in onComplete event to open each URL in a separate window

This is a working example code:

<xp:button
    id="button1"
    value="Download">
    <xp:eventHandler
        event="onclick"
        submit="true"
        refreshMode="partial"
        refreshId="panelDownloadURLs">
        <xp:this.action><![CDATA[#{javascript:var viewPanel = getComponent("viewPanel1");
            var selectedIDs = viewPanel.getSelectedIds();
            var filesToDownload = "";
            for(i=0; i < selectedIDs.length; i++) {
                var doc:NotesDocument = database.getDocumentByID(selectedIDs[i]);
                var attachments:java.util.Vector = session.evaluate("@AttachmentNames", doc);
                for (var i = 0; i < attachments.size(); i++) {
                    var attachment = doc.getAttachment(attachments.get(i).toString());
                    if (attachment != null) {
                        filesToDownload += context.getUrl().getAddress().replace(view.getPageName(), '') + 
                            '/0/' + doc.getUniversalID() + '/$FILE/' + attachment.getName() + '#';
                    }
                }
            }
            getComponent("inputDownloadURLs").setValue(filesToDownload);}]]></xp:this.action>
        <xp:this.onComplete><![CDATA[
            var filesToDownload = dojo.byId("#{id:inputDownloadURLs}").value.split("#");
            for (var i = 0; i < filesToDownload.length; i++) {
                if (!filesToDownload[i].toString() == "") {
                    window.open(filesToDownload[i]);
                }
            }]]></xp:this.onComplete>
    </xp:eventHandler>
</xp:button>
<xp:panel
    id="panelDownloadURLs">
    <xp:inputHidden
        id="inputDownloadURLs"
        value=""></xp:inputHidden>
</xp:panel>

But, this alternative solution feels a bit messy if you have a lot of attachments...

回答2:

So I finally figured this out. Using a combination of the zip file code from in Naveen Maurya's XSnippet. and some java code found here. I will post my final code once finished.

It turns out I didn't need to download attached documents rather files from the servers file system.

来源：https://stackoverflow.com/questions/32954221/is-there-a-simple-way-to-allow-a-user-to-download-the-files-in-selected-document

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xpages