replace media, shared state, better category options

files/widgets.py

@@ -0,0 +1,39 @@
+import json
+
+from django import forms
+from django.utils.safestring import mark_safe
+
+
+class CategoryModalWidget(forms.SelectMultiple):
+    """Two-panel category selector with modal"""
+
+    class Media:
+        css = {'all': ('css/category_modal.css',)}
+        js = ('js/category_modal.js',)
+
+    def render(self, name, value, attrs=None, renderer=None):
+        # Get all categories as JSON
+        categories = []
+        for opt_value, opt_label in self.choices:
+            if opt_value:  # Skip empty choice
+                categories.append({'id': str(opt_value), 'title': str(opt_label)})
+
+        all_categories_json = json.dumps(categories)
+        selected_ids_json = json.dumps([str(v) for v in (value or [])])
+
+        html = f'''<div class="category-widget" data-name="{name}">
+  <div class="category-content">
+    <div class="category-panel">
+      <input type="text" class="category-search" placeholder="Search categories...">
+      <div class="category-list scrollable" data-panel="left"></div>
+    </div>
+    <div class="category-panel">
+      <h3>Selected Categories</h3>
+      <div class="category-list scrollable" data-panel="right"></div>
+    </div>
+  </div>
+  <div class="hidden-inputs"></div>
+  <script type="application/json" class="category-data">{{"all":{all_categories_json},"selected":{selected_ids_json}}}</script>
+</div>'''
+
+        return mark_safe(html)