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Use #state with taxonomy reference field (multiple terms)

If we add a “taxonomy” reference field, we have a field in the form that lists the terms. If I dump $form, I get for this field:

field_zone" => array:7 [▼     "#type" => "container"     "#parents" => array:1 [▶]     "#attributes" => array:1 [▶]     "widget" => array:15 [▼       "#title" => "Zone"       "#description" => ""       "#field_parents" => []       "#required" => false       "#delta" => 0       "#weight" => 0       "#element_validate" => array:1 [▶]       "#key_column" => "target_id"       "#type" => "checkboxes"       "#default_value" => []       "#options" => array:12 [▼         433 => DrupalCoreFieldFieldFilteredMarkup {#6483 ▼           #string: "Asie-Pacifique"         }         434 => DrupalCoreFieldFieldFilteredMarkup {#6580 ▼           #string: "-Asie de l’Est"         }         10 => DrupalCoreFieldFieldFilteredMarkup {#6703 ▼           #string: "Afrique"         }         11 => DrupalCoreFieldFieldFilteredMarkup {#6704 ▼           #string: "-Afrique de l’Ouest"         }         12 => DrupalCoreFieldFieldFilteredMarkup {#6705 ▼           #string: "-Afrique Centrale"         }         13 => DrupalCoreFieldFieldFilteredMarkup {#6706 ▶}         14 => DrupalCoreFieldFieldFilteredMarkup {#6707 ▶}         15 => DrupalCoreFieldFieldFilteredMarkup {#6708 ▶}         16 => DrupalCoreFieldFieldFilteredMarkup {#6709 ▶}         17 => DrupalCoreFieldFieldFilteredMarkup {#6710 ▶}         18 => DrupalCoreFieldFieldFilteredMarkup {#6711 ▶}         19 => DrupalCoreFieldFieldFilteredMarkup {#6712 ▶}       ]       "#after_build" => array:1 [▶]       "#field_name" => "field_zone_expertise"       "#parents" => array:1 [▶]       "#tree" => true     ]

We can therefore see that the field is of the container type and that each taxonomy term is an option. In front, it appears as checkboxes.

Is it possible to use #states with these options? I have tried many things without success.

I know how to do it with a single field but not with this multiple field. I would like when we check on the parent term that the child terms are checked.

I tried to do it with custom JS but I encounter problems when I add the “checked” attribute :

$('#edit-field-zone-11').attr('checked', true);

It works but not always well because Drupal doesn’t use this attribute.

This article was republished from its original source.
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Use #state with taxonomy reference field (multiple terms)

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