diff --git a/docassemble/AssemblyLine/al_document.py b/docassemble/AssemblyLine/al_document.py
index fe72dfc9..35b9ba46 100644
--- a/docassemble/AssemblyLine/al_document.py
+++ b/docassemble/AssemblyLine/al_document.py
@@ -1,6 +1,8 @@
-import re
-import os
+import json
 import mimetypes
+import os
+import re
+from html import escape
 from typing import Any, Dict, List, Literal, Union, Callable, Optional
 from docassemble.base.util import (
     Address,
@@ -175,6 +177,14 @@ def html_safe_str(the_string: str) -> str:
     return re.sub(r"[^A-Za-z0-9]+", "_", the_string)
 
 
+def _javascript_href(function_name: str, *args: Any) -> str:
+    """Build a JavaScript URL that is safe to use in an HTML href attribute."""
+    return escape(
+        f"javascript:{function_name}({','.join(json.dumps(arg) for arg in args)})",
+        quote=True,
+    )
+
+
 def table_row(title: str, button_htmls: List[str] = []) -> str:
     """
     Generate an HTML row string for an AL document-styled table.
@@ -2408,10 +2418,11 @@ def send_email_table_row(
         al_email_input_id = "_ignore_al_doc_email_" + name
         al_send_button_id = "al_send_email_button_" + name
 
-        javascript_string = (
-            f"javascript:aldocument_send_action("
-            f"'{self.attr_name('send_email_action_event')}',"
-            f"'{al_wants_editable_input_id}','{al_email_input_id}')"
+        javascript_string = _javascript_href(
+            "aldocument_send_action",
+            str(self.attr_name("send_email_action_event")),
+            al_wants_editable_input_id,
+            al_email_input_id,
         )
 
         # Label "email" and input field for the 1st column of the table row
@@ -2474,23 +2485,23 @@ def send_button_to_html(
         name = html_safe_str(self.instanceName) + random_suffix()
         al_send_button_id = "al_send_email_to_button_" + name
 
+        formats_value: Optional[Union[str, List[str]]]
         if isinstance(preferred_formats, (list, tuple)):
-            formats_js = "[" + ",".join(f"'{fmt}'" for fmt in preferred_formats) + "]"
+            formats_value = [str(fmt) for fmt in preferred_formats]
         elif preferred_formats:
-            formats_js = f"'{preferred_formats}'"
+            formats_value = str(preferred_formats)
         else:
-            formats_js = "null"
-
-        javascript_string = (
-            f"javascript:aldocument_send_to_action("
-            f"'{self.attr_name('send_email_to_action_event')}',"
-            f"'{editable}',"
-            f"'{email}',"
-            f"'{al_send_button_id}',"
-            f"'{template_name}',"
-            f"'{key}',"
-            f"{formats_js}"
-            f")"
+            formats_value = None
+
+        javascript_string = _javascript_href(
+            "aldocument_send_to_action",
+            str(self.attr_name("send_email_to_action_event")),
+            str(editable),
+            str(email),
+            al_send_button_id,
+            str(template_name),
+            str(key),
+            formats_value,
         )
         send_button = action_button_html(
             javascript_string,
@@ -2560,22 +2571,15 @@ def send_button_html(
         al_email_input_id = "_ignore_al_doc_email_" + name
         al_send_button_id = "al_send_email_button_" + name
 
-        if isinstance(preferred_formats, (list, tuple)):
-            formats_js = "[" + ",".join(f"'{fmt}'" for fmt in preferred_formats) + "]"
-        elif preferred_formats:
-            formats_js = f"'{preferred_formats}'"
-        else:
-            formats_js = "null"
-
-        javascript_string = (
-            f"javascript:aldocument_send_action("
-            f"'{self.attr_name('send_email_action_event')}',"
-            f"'{al_wants_editable_input_id}',"
-            f"'{al_email_input_id}',"
-            f"'{template_name}',"
-            f"'{key}',"
-            f"{formats_js}"
-            ")"
+        formats_value = [str(fmt) for fmt in preferred_formats]
+        javascript_string = _javascript_href(
+            "aldocument_send_action",
+            str(self.attr_name("send_email_action_event")),
+            al_wants_editable_input_id,
+            al_email_input_id,
+            str(template_name),
+            str(key),
+            formats_value,
         )
 
         # Container of whole email section with header
diff --git a/docassemble/AssemblyLine/test_al_document.py b/docassemble/AssemblyLine/test_al_document.py
index f8a1c063..da6cab34 100644
--- a/docassemble/AssemblyLine/test_al_document.py
+++ b/docassemble/AssemblyLine/test_al_document.py
@@ -1,8 +1,37 @@
 # do not pre-load
 
+import json
 import unittest
+from html import unescape
 from docassemble.base.util import DAFile, DATemplate
-from .al_document import ALDocument, ALDocumentBundle, ALAddendumField
+from .al_document import ALDocument, ALDocumentBundle, ALAddendumField, _javascript_href
+
+
+class TestJavascriptHref(unittest.TestCase):
+    def test_escapes_javascript_strings_inside_html_href(self):
+        result = _javascript_href(
+            "aldocument_send_action",
+            "template_request.requestee_bundles['4167e36be7f04794ad30770e865afe68']",
+            "_ignore_al_wants_editable_bundle",
+            "_ignore_al_doc_email_bundle",
+        )
+
+        self.assertEqual(
+            result,
+            "javascript:aldocument_send_action("
+            ""template_request.requestee_bundles['4167e36be7f04794ad30770e865afe68']","
+            ""_ignore_al_wants_editable_bundle","
+            ""_ignore_al_doc_email_bundle")",
+        )
+
+    def test_preserves_javascript_value_types(self):
+        result = unescape(_javascript_href("send", "None", None, ["pdf", "docx"]))
+        args_json = result.removeprefix("javascript:send(").removesuffix(")")
+
+        self.assertEqual(
+            json.loads(f"[{args_json}]"),
+            ["None", None, ["pdf", "docx"]],
+        )
 
 
 class test_dont_assume_pdf(unittest.TestCase):