Index: openacs-4/packages/acs-subsite/www/resources/core.js
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-subsite/www/resources/core.js,v
diff -u -r1.17.2.5 -r1.17.2.6
--- openacs-4/packages/acs-subsite/www/resources/core.js	8 Oct 2022 19:50:02 -0000	1.17.2.5
+++ openacs-4/packages/acs-subsite/www/resources/core.js	7 Aug 2023 14:53:57 -0000	1.17.2.6
@@ -155,13 +155,59 @@
 }
 
 function acs_ListBulkActionClick(formName, url) {
-  if (document.forms == null) return;
-  if (document.forms[formName] == null) return;
+    const form = document.querySelector('form[name=' + formName + ']');
+    if (!form) {
+        return;
+    }
 
-  var form = document.forms[formName];
+    //
+    // Sometimes is convenient to have a single page serving the
+    // purpose of multiple bulk-actions, for instance
+    // "do-bulk-stuff?action=1" and "do-bulk-stuff?action=2".
+    //
+    // To do so, we parse the URL searching for query parameters. If
+    // there are, we inject them into the bulk-actions form together
+    // with the rest of the request.
+    //
+    // Note that the variables specified this way have total
+    // precedence and will override those specified differently.
+    //
 
-  form.action = url;
-  form.submit();
+    //
+    // Parse the URL
+    //
+    const queryString = url.split('?')[1];
+    const searchParams = new window.URLSearchParams(queryString);
+
+    //
+    // Cleanup pre-existing variable conflicting with the URL ones
+    //
+    for (const [name, value] of searchParams) {
+        for (const e of form.querySelectorAll('[name=' + name + ']')) {
+            form.removeChild(e);
+        }
+    }
+
+    //
+    // Inject the variables in the form.
+    //
+    // Note that most browsers now support the "formdata" event, that
+    // can be use to manipulate the FormData object directly on the
+    // form before this is submitted. However, Safari only introduced
+    // support for it in 2021, so we resort to this method.
+    //
+    // See https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/formdata_event
+    //
+    for (const [name, value] of searchParams) {
+        const i = document.createElement('input');
+        i.setAttribute('type', 'hidden');
+        i.setAttribute('name', name);
+        i.value = value;
+        form.appendChild(i);
+    }
+
+    form.action = url;
+    form.submit();
 }
 
 //