Adds the ability to select single articles by entering their IDs. (#1591)

* Added the ability to select single articles by entering their IDs.

* Make sure empty spaces are stripped out.

engines/joomla/nucleus/particles/contentarray.html.twig

@@ -21,7 +21,12 @@
     {% set categories = joomla.finder('category', category_options).published(1).language().limit(0).find() %}
 
     {# Content Finder #}
-    {% set article_finder = joomla.finder('content').category(categories).published(1).language() %}
+    {% if filter.articles %}
+        {% set article_options = filter.articles ? {id: [filter.articles|replace(' ', '')|split(',')]} : {} %}
+        {% set article_finder = joomla.finder('content', article_options).published(1).language() %}
+    {% else %}
+        {% set article_finder = joomla.finder('content').category(categories).published(1).language() %}
+    {% endif %}
 
     {% set featured = filter.featured|default('include') %}
     {% if featured == 'exclude' %}

engines/joomla/nucleus/particles/contentarray.yaml

@@ -23,6 +23,12 @@ form:
               description: Select the categories the articles should be taken from.
               overridable: false
 
+            article.filter.articles:
+              type: input.text
+              label: Articles
+              description: Enter the Joomla articles that should be shown. It should be a list of article IDs separated with a comma (i.e. 1,2,3,4,5).
+              overridable: false
+
             article.filter.featured:
               type: select.select
               label: Featured Articles