htmx integration

static/packages/htmx/ext/include-vals.js

@@ -0,0 +1,28 @@
+(function(){
+    if (htmx.version && !htmx.version.startsWith("1.")) {
+        console.warn("WARNING: You are using an htmx 1 extension with htmx " + htmx.version +
+            ".  It is recommended that you move to the version of this extension found on https://htmx.org/extensions")
+    }
+
+    function mergeObjects(obj1, obj2) {
+        for (var key in obj2) {
+            if (obj2.hasOwnProperty(key)) {
+                obj1[key] = obj2[key];
+            }
+        }
+        return obj1;
+    }
+
+    htmx.defineExtension('include-vals', {
+        onEvent: function (name, evt) {
+            if (name === "htmx:configRequest") {
+                var includeValsElt = htmx.closest(evt.detail.elt, "[include-vals],[data-include-vals]");
+                if (includeValsElt) {
+                    var includeVals = includeValsElt.getAttribute("include-vals") || includeValsElt.getAttribute("data-include-vals");
+                    var valuesToInclude = eval("({" + includeVals + "})");
+                    mergeObjects(evt.detail.parameters, valuesToInclude);
+                }
+            }
+        }
+    });
+})();