Add telepath adapter for PageChooser widget

client/src/entrypoints/admin/telepath/widgets.js

@@ -58,3 +58,22 @@ class RadioSelect extends Widget {
     boundWidgetClass = BoundRadioSelect;
 }
 window.telepath.register('wagtail.widgets.RadioSelect', RadioSelect);
+
+
+class PageChooser {
+    constructor(html, idForLabel, config) {
+        this.html = html;
+        this.idForLabel = idForLabel;
+        this.config = config;
+    }
+
+    render(placeholder, name, id) {
+        var html = this.html.replace(/__NAME__/g, name).replace(/__ID__/g, id);
+        var dom = $(html);
+        $(placeholder).replaceWith(dom);
+        /* the chooser object returned by createPageChooser also serves as the JS widget representation */
+        // eslint-disable-next-line no-undef
+        return createPageChooser(id, null, this.config);
+    }
+}
+window.telepath.register('wagtail.widgets.PageChooser', PageChooser);

wagtail/admin/widgets/chooser.py

@@ -8,6 +8,7 @@ from django.utils.translation import gettext_lazy as _
 
 from wagtail.admin.staticfiles import versioned_static
 from wagtail.core.models import Page
+from wagtail.core.telepath import Adapter, register
 from wagtail.utils.widgets import WidgetWithScript
 
 
@@ -166,3 +167,23 @@ class AdminPageChooser(AdminChooser):
             versioned_static('wagtailadmin/js/page-chooser-modal.js'),
             versioned_static('wagtailadmin/js/page-chooser.js'),
         ])
+
+
+class PageChooserAdapter(Adapter):
+    js_constructor = 'wagtail.widgets.PageChooser'
+
+    def js_args(self, widget, context):
+        return [
+            widget.render_html('__NAME__', None, attrs={'id': '__ID__'}),
+            widget.id_for_label('__ID__'),
+            widget.client_options,
+        ]
+
+    @property
+    def media(self):
+        return AdminPageChooser().media + forms.Media(js=[
+            versioned_static('wagtailadmin/js/telepath/widgets.js')
+        ])
+
+
+register(PageChooserAdapter(), AdminPageChooser)

wagtail/core/blocks/field_block.py

@@ -721,6 +721,18 @@ class PageChooserBlock(ChooserBlock):
         return AdminPageChooser(target_models=self.target_models,
                                 can_choose_root=self.can_choose_root)
 
+    def get_form_state(self, value):
+        value_data = self.widget.get_value_data(value)
+        if value_data is None:
+            return None
+        else:
+            return {
+                'id': value_data['id'],
+                'parentId': value_data['parent_id'],
+                'adminTitle': value_data['display_title'],
+                'editUrl': value_data['edit_url'],
+            }
+
     def render_basic(self, value, context=None):
         if value:
             return format_html('<a href="{0}">{1}</a>', value.url, value.title)