Add function to download pdf and download based the downloadBtn parameter

A new taxonomy for the download button should be added in the base configuration file.
eg downloadable = "downloadBtn"
When this downloadBtn is added in the front matter of any of the content files, it will be displayed.
eg downloadBtn: "true"
Adding it to the archetypes and setting it to false by default be awesome.

Signed-off-by: Ida Delphine <mida@unicef.org>

assets/js/script.js

@@ -127,4 +127,23 @@
     $(this).removeClass('active')
   })
 
+
+  // Download page to pdf format
+  window.onload = function() {
+      document.getElementById("generatePDF")
+          .addEventListener("click", () => {
+              const content = this.document.getElementById("content");
+              console.log(content);
+              console.log(window);
+              var opt = {
+                  margin: 1,
+                  filename: document.querySelector('#title').innerHTML,
+                  image: { type: 'jpeg', quality: 0.98 },
+                  html2canvas: { scale: 2 },
+                  jsPDF: { unit: 'in', format: 'letter', orientation: 'portrait' }
+              };
+              html2pdf().from(content).set(opt).save();
+          })
+    }
+
 })(jQuery);

layouts/partials/default.html

@@ -13,10 +13,12 @@
               {{ end }}
             {{ end }}
             {{ if .Content }}
+              {{ if eq .Params.downloadBtn "true" }}
                 <div>
                     <button class="btn btn-primary btn-block" id="generatePDF" > Get Pdf  </button>
                 </div>
               {{ end }}
+            {{ end }}
           </ul>
         </div>
       </div>