Refactor client-side fetch logic (#693)

* extract generic behaviors

* preserve query string when refreshing content

* refactor details modal refresh

* refactor bulk edit

* update tests

* restore tag modal

* Make IntelliJ aware of custom attributes

* improve e2e test coverage

bookmarks/frontend/behaviors/fetch.js

@@ -0,0 +1,25 @@
+import { fireEvents, registerBehavior, swap } from "./index";
+
+class FetchBehavior {
+  constructor(element) {
+    this.element = element;
+    const eventName = element.getAttribute("ld-on");
+
+    element.addEventListener(eventName, this.onFetch.bind(this));
+  }
+
+  async onFetch(event) {
+    event.preventDefault();
+    const url = this.element.getAttribute("ld-fetch");
+    const html = await fetch(url).then((response) => response.text());
+
+    const target = this.element.getAttribute("ld-target");
+    const select = this.element.getAttribute("ld-select");
+    swap(this.element, html, { target, select });
+
+    const events = this.element.getAttribute("ld-fire");
+    fireEvents(events);
+  }
+}
+
+registerBehavior("ld-fetch", FetchBehavior);