Added support for `dependsOn` with relationships (#3539)

Credit to @tobias-kuendig. Added $.oc.relationBehavior.changed function. To keep track of changes made using the relation controller this new "changed" function is called every time a record is created, added, removed or deleted. The function triggers the change.oc.formwidget event on the form field that belongs to this relation controller so other form fields are notified about the changes.

modules/backend/behaviors/relationcontroller/assets/js/october.relation.js

@@ -59,6 +59,15 @@
             })
         }
 
+        /*
+         * This function is called every time a record is created, added, removed
+         * or deleted using the relation widget. It triggers the change.oc.formwidget
+         * event to notify other elements on the page about the changed form state.
+         */
+        this.changed = function(relationId, event) {
+            $('[data-field-name="' + relationId + '"]').trigger('change.oc.formwidget', {event: event});
+        }
+
         /*
          * This function transfers the supplied variables as hidden form inputs,
          * to any popup that is spawned within the supplied container. The spawned 

modules/backend/behaviors/relationcontroller/partials/_button_delete.htm

@@ -3,6 +3,7 @@
         class="btn btn-sm btn-secondary oc-icon-trash-o"
         data-request="onRelationButtonDelete"
         data-request-confirm="<?= e(trans('backend::lang.relation.delete_confirm')) ?>"
+        data-request-success="$.oc.relationBehavior.changed('<?= e($this->vars['relationField']) ?>', 'deleted')"
         data-stripe-load-indicator>
         <?= e(trans('backend::lang.relation.delete')) ?>
     </button>
@@ -15,6 +16,7 @@
         disabled="disabled"
         data-request="onRelationButtonDelete"
         data-request-confirm="<?= e(trans('backend::lang.relation.delete_confirm')) ?>"
+        data-request-success="$.oc.relationBehavior.changed('<?= e($this->vars['relationField']) ?>', 'deleted')"
         data-trigger-action="enable"
         data-trigger="#<?= $this->relationGetId('view') ?> .control-list input[type=checkbox]"
         data-trigger-condition="checked"

modules/backend/behaviors/relationcontroller/partials/_button_remove.htm

@@ -2,6 +2,7 @@
     <button
         class="btn btn-sm btn-secondary oc-icon-minus"
         data-request="onRelationButtonRemove"
+        data-request-success="$.oc.relationBehavior.changed('<?= e($this->vars['relationField']) ?>', 'removed')"
         data-stripe-load-indicator>
         <?= e(trans('backend::lang.relation.remove')) ?>
     </button>
@@ -13,6 +14,7 @@
         })"
         disabled="disabled"
         data-request="onRelationButtonRemove"
+        data-request-success="$.oc.relationBehavior.changed('<?= e($this->vars['relationField']) ?>', 'removed')"
         data-trigger-action="enable"
         data-trigger="#<?= $this->relationGetId('view') ?> .control-list input[type=checkbox]"
         data-trigger-condition="checked"

modules/backend/behaviors/relationcontroller/partials/_button_unlink.htm

@@ -2,6 +2,7 @@
     href="javascript:;"
     class="btn btn-sm btn-secondary oc-icon-unlink"
     data-request="onRelationButtonUnlink"
+    data-request-success="$.oc.relationBehavior.changed('<?= e($this->vars['relationField']) ?>', 'removed')"
     data-request-confirm="<?= e(trans('backend::lang.relation.unlink_confirm')) ?>"
     data-stripe-load-indicator>
     <?= e(trans('backend::lang.relation.unlink')) ?>

modules/backend/behaviors/relationcontroller/partials/_manage_form.htm

@@ -47,7 +47,11 @@
 
     <?php else: ?>
 
-        <?= Form::ajax('onRelationManageCreate', ['data-popup-load-indicator' => true, 'sessionKey' => $newSessionKey]) ?>
+        <?= Form::ajax('onRelationManageCreate', [
+            'data-popup-load-indicator' => true,
+            'data-request-success' => "$.oc.relationBehavior.changed('" . e($this->vars['relationField']) . "', 'created')",
+            'sessionKey' => $newSessionKey
+        ]) ?>
 
             <!-- Passable fields -->
             <input type="hidden" name="_relation_field" value="<?= $relationField ?>" />

modules/backend/behaviors/relationcontroller/partials/_manage_list.htm

@@ -21,6 +21,7 @@
                     class="btn btn-primary"
                     data-request="onRelationManageAdd"
                     data-dismiss="popup"
+                    data-request-success="$.oc.relationBehavior.changed('<?= e($this->vars['relationField']) ?>', 'added')"
                     data-stripe-load-indicator>
                     <?= e(trans('backend::lang.relation.add_selected')) ?>
                 </button>