Check twig file field is empty or not.

For check Twig file field is empty or not, look at the syntax..

 

{% if content.field_machine_name[0] is not empty %}
           /* write comment here */
{% else %}
          /* write comment here */
{% endif %}

                                 OR

{% if content.field_machine_name|render %}
       /* write comment here */
{% endif %}


Note: If have any suggestions or issue regarding 'Check twig file field is empty or not' then you can ask by comments.

Twig file feature in Drupal 8.

We use '.tpl.php' extension for druapl 7 but now in case of drupal 8 extension is '.html.twig'.
Lets talk about twig file..

1. For node id in twig file syntax..  {{ node.id }}
2. For node title in twig file syntax.. {{ node.label }}
3. For node body in twig file syntax.. {{ node.body }} 
4. For node any field.. {{ content.field_machine_name[0] }} or {{ content.field_machine_name.0 }}

if else syntax..

{% if ... %}
            /* write comment here */
{% else %}
           /* write comment here */
{% endif %}

For create variable in twig file syntax..

 

{% set variable name = "variable value" %}  then write {{  variable name }} and use it easily.

 Note: If have any suggestions or issue regarding 'Twig file feature in Drupal 8' then you can ask by comments.