Ignore viz.image on screenshooting (#329)

Author: roll

ckanext/querytool/fanstatic/javascript/public_query.js

@@ -237,6 +237,10 @@
             });
 
             html2canvas(document.body, {
+              //fix images
+              ignoreElements: function(element) {
+                if (element.className == 'html2canvas-ignore') return true;
+              },
             }).then(function(canvas) {
                 Canvas2Image.saveAsPNG(canvas);
             });

ckanext/querytool/templates/querytool/public/read.html

@@ -163,7 +163,7 @@
         {% endif %}
         {% if item.type == 'image' %}
           <div class="item-content" >
-            <img src="{{ item.url }}">
+            <img src="{{ item.url }}" class="html2canvas-ignore">
           </div>
         {% endif %}
         {% if item.type == 'map'  %}