New plugin hook: extra_body_script

datasette/hookspecs.py

@@ -25,6 +25,11 @@ def extra_js_urls():
     "Extra JavaScript URLs added by this plugin"
 
 
+@hookspec
+def extra_body_script(template, database, table, datasette):
+    "Extra JavaScript code to be included in <script> at bottom of body"
+
+
 @hookspec
 def publish_subcommand(publish):
     "Subcommands for 'datasette publish'"

datasette/templates/base.html

@@ -35,6 +35,11 @@
         {% endif %}
     {% endif %}
 </div>
+
+{% for body_script in body_scripts %}
+    <script>{{ body_script }}</script>
+{% endfor %}
+
 {% if select_templates %}<!-- Templates considered: {{ select_templates|join(", ") }} -->{% endif %}
 </body>
 </html>

datasette/views/base.py

@@ -52,6 +52,14 @@ class RenderMixin(HTTPMethodView):
             "{}{}".format("*" if template_name == template.name else "", template_name)
             for template_name in templates
         ]
+        body_scripts = []
+        for script in pm.hook.extra_body_script(
+            template=template.name,
+            database=context.get("database"),
+            table=context.get("table"),
+            datasette=self.ds
+        ):
+            body_scripts.append(jinja2.Markup(script))
         return response.html(
             template.render(
                 {
@@ -60,6 +68,7 @@ class RenderMixin(HTTPMethodView):
                         "app_css_hash": self.ds.app_css_hash(),
                         "select_templates": select_templates,
                         "zip": zip,
+                        "body_scripts": body_scripts,
                     }
                 }
             )