assets/resource-browser.js in jekyll-theme-isotc211-0.4.9 vs assets/resource-browser.js in jekyll-theme-isotc211-0.5.0

@@ -13,14 +13,67 @@
         item.classList.add('selected');
       }
 
       for (var el of browser.querySelectorAll('.bp3-tree-node-label a')) {
         el.addEventListener('click', function (evt) {
+          iframe.setAttribute('src', 'about:blank');
+
+          var itemUrl = evt.target.getAttribute('href');
+          // var extension = itemUrl.slice('-1');
+          fetchResource(itemUrl, function () {
+            if (this.responseXML) {
+              try {
+                iframe.setAttribute('src', 'about:blank');
+                iframe.contentWindow.document.open();
+                iframe.contentWindow.document.write(
+                  '<pre>' +
+                  new Option(prettyPrintXML(this.responseXML)).innerHTML +
+                  '</pre>');
+                iframe.contentWindow.document.close();
+
+              } catch (e) {
+                iframe.setAttribute('src', itemUrl);
+              }
+            } else {
+              iframe.setAttribute('src', itemUrl);
+            }
+          });
+
           selectItem(evt.target);
+
           evt.preventDefault();
-          iframe.setAttribute('src', evt.target.getAttribute('href'));
           return false;
         });
       }
     }
   }
+
+  function fetchResource(url, handleResourceResponse) {
+    var oReq = new XMLHttpRequest();
+    oReq.addEventListener("load", handleResourceResponse);
+    oReq.open("GET", url);
+    // oReq.overrideMimeType("text/plain; charset=x-user-defined");
+    oReq.send();
+  }
+
+  function prettyPrintXML(xmlDoc) {
+    var xsltDoc = new DOMParser().parseFromString([
+      // describes how we want to modify the XML - indent everything
+      '<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform">',
+      '  <xsl:strip-space elements="*"/>',
+      '  <xsl:template match="para[content-style][not(text())]">', // change to just text() to strip space in text nodes
+      '    <xsl:value-of select="normalize-space(.)"/>',
+      '  </xsl:template>',
+      '  <xsl:template match="node()|@*">',
+      '    <xsl:copy><xsl:apply-templates select="node()|@*"/></xsl:copy>',
+      '  </xsl:template>',
+      '  <xsl:output indent="yes"/>',
+      '</xsl:stylesheet>',
+    ].join('\n'), 'application/xml');
+
+    var xsltProcessor = new XSLTProcessor();    
+    xsltProcessor.importStylesheet(xsltDoc);
+    var resultDoc = xsltProcessor.transformToDocument(xmlDoc);
+    var resultXml = new XMLSerializer().serializeToString(resultDoc);
+    return resultXml;
+  };
 }());