Screenshot handling on the diff/preview section refactor (#630)

changedetectionio/__init__.py

@@ -809,7 +809,13 @@ def changedetection_app(config=None, datastore_o=None):
 
         screenshot_url = datastore.get_screenshot(uuid)
 
-        output = render_template("diff.html", watch_a=watch,
+        system_uses_webdriver = datastore.data['settings']['application']['fetch_backend'] == 'html_webdriver'
+
+        is_html_webdriver = True if watch.get('fetch_backend') == 'html_webdriver' or (
+                    watch.get('fetch_backend', None) is None and system_uses_webdriver) else False
+
+        output = render_template("diff.html",
+                                 watch_a=watch,
                                  newest=newest_version_file_contents,
                                  previous=previous_version_file_contents,
                                  extra_stylesheets=extra_stylesheets,
@@ -820,7 +826,8 @@ def changedetection_app(config=None, datastore_o=None):
                                  current_diff_url=watch['url'],
                                  extra_title=" - Diff - {}".format(watch['title'] if watch['title'] else watch['url']),
                                  left_sticky=True,
-                                 screenshot=screenshot_url)
+                                 screenshot=screenshot_url,
+                                 is_html_webdriver=is_html_webdriver)
 
         return output
 
@@ -881,6 +888,11 @@ def changedetection_app(config=None, datastore_o=None):
             content.append({'line': "No history found", 'classes': ''})
 
         screenshot_url = datastore.get_screenshot(uuid)
+        system_uses_webdriver = datastore.data['settings']['application']['fetch_backend'] == 'html_webdriver'
+
+        is_html_webdriver = True if watch.get('fetch_backend') == 'html_webdriver' or (
+                watch.get('fetch_backend', None) is None and system_uses_webdriver) else False
+
         output = render_template("preview.html",
                                  content=content,
                                  extra_stylesheets=extra_stylesheets,
@@ -889,8 +901,9 @@ def changedetection_app(config=None, datastore_o=None):
                                  current_diff_url=watch['url'],
                                  screenshot=screenshot_url,
                                  watch=watch,
-                                 uuid=uuid)
+                                 uuid=uuid,
-        
+                                 is_html_webdriver=is_html_webdriver)
+
         return output
 
     @app.route("/settings/notification-logs", methods=['GET'])

changedetectionio/static/js/diff-overview.js

@@ -0,0 +1,14 @@
+$(document).ready(function () {
+    // Load it when the #screenshot tab is in use, so we dont give a slow experience when waiting for the text diff to load
+    window.addEventListener('hashchange', function (e) {
+        toggle(location.hash);
+    }, false);
+
+    toggle(location.hash);
+
+    function toggle(hash_name) {
+        if (hash_name === '#screenshot') {
+            $("img#screenshot-img").attr('src', screenshot_url);
+        }
+    }
+});

changedetectionio/templates/diff.html

@@ -1,6 +1,11 @@
 {% extends 'base.html' %}
 
 {% block content %}
+<script>
+    const screenshot_url="{{url_for('static_content', group='screenshot', filename=uuid)}}";
+</script>
+<script type="text/javascript" src="{{url_for('static_content', group='js', filename='diff-overview.js')}}" defer></script>
+
 <div id="settings">
     <h1>Differences</h1>
     <form class="pure-form " action="" method="GET">
@@ -39,6 +44,7 @@
 <div class="tabs">
     <ul>
         <li class="tab" id="default-tab"><a href="#text">Text</a></li>
+        <li class="tab" id="screenshot-tab"><a href="#screenshot">Screenshot</a></li>
     </ul>
 </div>
 
@@ -60,6 +66,21 @@
          </table>
          Diff algorithm from the amazing <a href="https://github.com/kpdecker/jsdiff">github.com/kpdecker/jsdiff</a>
      </div>
+     <div class="tab-pane-inner" id="screenshot">
+         <div class="tip">
+             For now, Differences are performed on text, not graphically, only the latest screenshot is available.
+         </div>
+         </br>
+         {% if is_html_webdriver %}
+           {% if screenshot|length >1 %}
+             <img style="max-width: 80%" id="screenshot-img" alt="Current screenshot from most recent request"/>
+           {% else %}
+              No screenshot available just yet! Try rechecking the page.
+           {% endif %}
+         {% else %}
+           <strong>Screenshot requires Playwright/WebDriver enabled</strong>
+         {% endif %}
+     </div>
 </div>
 
 

changedetectionio/templates/preview.html

@@ -1,6 +1,10 @@
 {% extends 'base.html' %}
 
 {% block content %}
+<script>
+    const screenshot_url="{{url_for('static_content', group='screenshot', filename=uuid)}}";
+</script>
+<script type="text/javascript" src="{{url_for('static_content', group='js', filename='diff-overview.js')}}" defer></script>
 
 <div id="settings">
     <h1>Current - {{watch.last_checked|format_timestamp_timeago}}</h1>
@@ -10,6 +14,7 @@
 <div class="tabs">
     <ul>
         <li class="tab" id="default-tab"><a href="#text">Text</a></li>
+        <li class="tab" id="screenshot-tab"><a href="#screenshot">Screenshot</a></li>
     </ul>
 </div>
 
@@ -28,5 +33,20 @@
             </tbody>
         </table>
     </div>
+     <div class="tab-pane-inner" id="screenshot">
+         <div class="tip">
+             For now, Differences are performed on text, not graphically, only the latest screenshot is available.
+         </div>
+         </br>
+         {% if is_html_webdriver %}
+           {% if screenshot|length >1 %}
+             <img style="max-width: 80%" id="screenshot-img" alt="Current screenshot from most recent request"/>
+           {% else %}
+              No screenshot available just yet! Try rechecking the page.
+           {% endif %}
+         {% else %}
+           <strong>Screenshot requires Playwright/WebDriver enabled</strong>
+         {% endif %}
+     </div>
 </div>
 {% endblock %}