FlexPaper Integration into XMLUI Brainstorming

This page is intended to document brainstorming for the following ticket: Unable to locate Jira server for this macro. It may be due to Application Link configuration. .

Goal

Provide an html5 PDF document viewer with page-turning capabilities.

Pre-requisites

FlexPaper Zine Commercial License: http://flexpaper.devaldi.com/download/
Copy css, js, and locale data into /dspace/modules/xmlui/src/main/webapp/static/flexpaper

Create a flexpaper viewer landing page

/dspace/modules/xmlui/src/main/webapp/static/flexpaper/template.html

This solution described below assumes that no pre-compiled assets exist. A modified version of this script would be needed to open up a pre-compiled asset.

<!doctype html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="initial-scale=1,user-scalable=0,maximum-scale=1,width=device-width" />

    <style type="text/css" media="screen">
      html, body { height:100%; }
      body { margin:0; padding:0; overflow:auto; }
      #flashContent { display:none; }
    </style>
    <link rel="stylesheet" type="text/css" href="css/flexpaper.css?r57627" />
    <script type="text/javascript" src="js/jquery.min.js?r57627"></script>
    <script type="text/javascript" src="js/jquery.extensions.min.js?r57627"></script>
    <script type="text/javascript" src="js/flexpaper.js?r57627"></script>
    <script type="text/javascript" src="js/flexpaper_handlers.js?r57627"></script>
    <script type="text/javascript">
    $(document).ready(function(){
      var loc = document.location.search;
 
      //Pull the path attribute from the URL
      loc = loc.replace(/.*path=/,"");
 
      //Load the dynamic html5 viewer from FlexPaper.
      //The full pdf must be downloaded to the browser before the document will be rendered
      $('#documentViewer').FlexPaperViewer(
        { config : {
          PDFFile : loc,
          RenderingOrder : 'html5',
          key : '<<License key goes here>>',
        }}
      );
 
      //define a callback to be run once the document viewer has loaded
      $('#documentViewer').bind('onDocumentLoaded',function(e,totalPages){
        //this callback is executed before the rendering has completed
        //therefore insert a short time delay before hiding the message at the top of the screen
        setTimeout(function(){
          $("#message").hide();
        }, 1000);
      });
    });
    </script>
   </head>
   <body>
     <h4 id="message">The document viewer is being prepared. Please be patient while your document is loaded.</h4>
     <div id="documentViewer" class="flexpaper_viewer" style="position:absolute;;width:100%;height:100%;background-color:#222222;;"></div>
   </body>
 </html>

XMLUI Theme Change

Modify the following template rule to include a link to the book viewer <xsl:template match="mets:file">.

<xsl:variable name="bitstreamurl" select="mets:FLocat[@LOCTYPE='URL']/@xlink:href"/>
<xsl:variable name="bitstreamid" select="@ID"/>
<td>
  <xsl:choose>
    <xsl:when test="contains($bitstreamurl, 'isAllowed=n')"/>
    <xsl:when test="@MIMETYPE='application/pdf'">
      <a target="bookView">
        <xsl:attribute name="href">
          <xsl:text>/static/flexpaper/template.html?path=</xsl:text>
          <xsl:value-of select="$bitstreamurl"/>
        </xsl:attribute>
        <xsl:text>Book View</xsl:text>
      </a>
    </xsl:when>
  </xsl:choose>
  <xsl:text>&#160;</xsl:text>
</td>

Sitemap.xmap changes

The following changes may be needed to ensure that static resources within the flexpaper folder are loaded.

<map:match pattern="static/**.pdf">
  <map:read type="ConcatenationReader" src="static/{1}.pdf">
    <map:parameter name="requestQueryString" value="{request:queryString}"/>
  </map:read>
</map:match>
<map:match pattern="static/**.jpg">
  <map:read type="ConcatenationReader" src="static/{1}.jpg">
    <map:parameter name="requestQueryString" value="{request:queryString}"/>
  </map:read>
</map:match>
<map:match pattern="static/**.js">
  <map:read type="ConcatenationReader" src="static/{1}.js">
    <map:parameter name="requestQueryString" value="{request:queryString}"/>
  </map:read>
</map:match>

Pre-compilation Process

For very large PDF's that will be accessed frequently, it might make sense to pre-compile the document viewer.

This solution presumes that pre-compiled assets have been made accessible under the following path.

/bookview/<handle>/<seq>/index.html

Add the following code to template.xml (above)

//Isolate the handle and sequence number from the bitstream path
var matchArr = /\/bitstream\/handle\/([\d\.]+)\/([\d\.]+)\/.+\.pdf\?sequence=(\d+)/.exec(loc);

if (matchArr != null) {
  if (matchArr.length > 3) {
    //pre-compiled assets must conform to the following structure in order to be opened as an 
    //alternative
    var precomp = "/bookview/" + matchArr[1] + "/" + matchArr[2] + "/" +
         matchArr[3] + "/index.html";

    //make ajax call to determine if a pre-compiled asset exists. 
    //If so, redirect to that page (which will terminate the load of the dynamic viewer) 
    //Otherwise the client-side html5 viewer will load as normal.
    $.get(precomp, function(){
      //if the get operation is successful, the following callback will be executed
      //note that the remainder of this script will process 
      document.location=precomp;
    });
  }
}

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