diff --git a/war/src/main/js/app.js b/war/src/main/js/app.js
index 63a35226d7d4..0ac9a97cce38 100644
--- a/war/src/main/js/app.js
+++ b/war/src/main/js/app.js
@@ -5,6 +5,7 @@ import Tooltips from "@/components/tooltips";
 import StopButtonLink from "@/components/stop-button-link";
 import ConfirmationLink from "@/components/confirmation-link";
 import Dialogs from "@/components/dialogs";
+import Autocomplete from "@/components/autocomplete";
 
 Dropdowns.init();
 Notifications.init();
@@ -13,3 +14,4 @@ Tooltips.init();
 StopButtonLink.init();
 ConfirmationLink.init();
 Dialogs.init();
+Autocomplete.init();
diff --git a/war/src/main/js/components/autocomplete/index.js b/war/src/main/js/components/autocomplete/index.js
new file mode 100644
index 000000000000..3f5a6367a285
--- /dev/null
+++ b/war/src/main/js/components/autocomplete/index.js
@@ -0,0 +1,88 @@
+import behaviorShim from "@/util/behavior-shim";
+import Utils from "@/components/dropdowns/utils";
+
+function init() {
+  function addValue(value, item, delimiter) {
+    const prev = value.includes(delimiter)
+      ? value.substring(0, value.lastIndexOf(delimiter) + 1) + " "
+      : "";
+    return prev + item + delimiter + " ";
+  }
+
+  function validate(e) {
+    if (e.targetUrl) {
+      var method = e.getAttribute("checkMethod") || "post";
+      try {
+        FormChecker.delayedCheck(e.targetUrl(), method, e.targetElement);
+      } catch (x) {
+        console.warn(x);
+        return;
+      }
+    }
+  }
+
+  function convertSuggestionToItem(suggestion, e) {
+    const delimiter = e.getAttribute("autoCompleteDelimChar");
+    return {
+      label: suggestion.name,
+      onClick: () => {
+        e.value = delimiter
+          ? addValue(e.value, suggestion.name, delimiter)
+          : suggestion.name;
+        validate(e);
+        e.focus();
+      },
+    };
+  }
+
+  function createAndShowDropdown(e, div, suggestions) {
+    const items = suggestions.map((s) => convertSuggestionToItem(s, e));
+    if (!e.dropdown) {
+      Utils.generateDropdown(
+        div,
+        (instance) => {
+          e.dropdown = instance;
+        },
+        true,
+      );
+    }
+    e.dropdown.setContent(Utils.generateDropdownItems(items, true));
+    e.dropdown.show();
+  }
+
+  function updateSuggestions(e, div) {
+    const text = e.value.trim();
+    const delimiter = e.getAttribute("autoCompleteDelimChar");
+    const word = delimiter ? text.split(delimiter).reverse()[0].trim() : text;
+    if (!word) {
+      if (e.dropdown) {
+        e.dropdown.hide();
+      }
+      return;
+    }
+    const url =
+      e.getAttribute("autoCompleteUrl") + "?value=" + encodeURIComponent(word);
+    fetch(url)
+      .then((rsp) => (rsp.ok ? rsp.json().suggestions : {}))
+      .then((response) => createAndShowDropdown(e, div, response));
+  }
+
+  behaviorShim.specify(
+    "INPUT.auto-complete",
+    "input-auto-complete",
+    0,
+    function (e) {
+      // form field with auto-completion support
+      // insert the auto-completion container
+      var div = document.createElement("DIV");
+      e.parentNode.insertBefore(div, e.nextElementSibling);
+      e.style.position = "relative";
+
+      e.addEventListener("input", (evt) => {
+        updateSuggestions(e, div);
+      });
+    },
+  );
+}
+
+export default { init };
diff --git a/war/src/main/js/components/dropdowns/utils.js b/war/src/main/js/components/dropdowns/utils.js
index 8a3677c939b1..5ef11b640c80 100644
--- a/war/src/main/js/components/dropdowns/utils.js
+++ b/war/src/main/js/components/dropdowns/utils.js
@@ -11,12 +11,12 @@ const SELECTED_ITEM_CLASS = "jenkins-dropdown__item--selected";
  * @param element - the element to generate the dropdown for
  * @param callback - called to retrieve the list of dropdown items
  */
-function generateDropdown(element, callback) {
+function generateDropdown(element, callback, immediate) {
   tippy(
     element,
     Object.assign({}, Templates.dropdown(), {
       onCreate(instance) {
-        instance.reference.addEventListener("mouseenter", () => {
+        const onload = () => {
           if (instance.loaded) {
             return;
           }
@@ -26,7 +26,12 @@ function generateDropdown(element, callback) {
           });
 
           callback(instance);
-        });
+        };
+        if (immediate) {
+          onload();
+        } else {
+          instance.reference.addEventListener("mouseenter", onload);
+        }
       },
     }),
   );
diff --git a/war/src/main/webapp/scripts/hudson-behavior.js b/war/src/main/webapp/scripts/hudson-behavior.js
index 8d1a0a9e8e8a..ef331e3fb2bb 100644
--- a/war/src/main/webapp/scripts/hudson-behavior.js
+++ b/war/src/main/webapp/scripts/hudson-behavior.js
@@ -1310,49 +1310,6 @@ function rowvgStartEachRow(recursive, f) {
     },
   );
 
-  Behaviour.specify(
-    "INPUT.auto-complete",
-    "input-auto-complete",
-    ++p,
-    function (e) {
-      // form field with auto-completion support
-      // insert the auto-completion container
-      var div = document.createElement("DIV");
-      e.parentNode.insertBefore(div, e.nextElementSibling);
-      e.style.position = "relative"; // or else by default it's absolutely positioned, making "width:100%" break
-
-      var ds = new YAHOO.util.XHRDataSource(e.getAttribute("autoCompleteUrl"));
-      ds.responseType = YAHOO.util.XHRDataSource.TYPE_JSON;
-      ds.responseSchema = {
-        resultsList: "suggestions",
-        fields: ["name"],
-      };
-
-      // Instantiate the AutoComplete
-      var ac = new YAHOO.widget.AutoComplete(e, div, ds);
-      ac.generateRequest = function (query) {
-        return "?value=" + query;
-      };
-      ac.autoHighlight = false;
-      ac.prehighlightClassName = "yui-ac-prehighlight";
-      ac.animSpeed = 0;
-      ac.formatResult = ac.formatEscapedResult;
-      ac.useShadow = true;
-      ac.autoSnapContainer = true;
-      ac.delimChar = e.getAttribute("autoCompleteDelimChar");
-      ac.doBeforeExpandContainer = function (textbox, container) {
-        // adjust the width every time we show it
-        container.style.width = textbox.clientWidth + "px";
-        var Dom = YAHOO.util.Dom;
-        Dom.setXY(container, [
-          Dom.getX(textbox),
-          Dom.getY(textbox) + textbox.offsetHeight,
-        ]);
-        return true;
-      };
-    },
-  );
-
   Behaviour.specify(
     "A.jenkins-help-button",
     "a-jenkins-help-button",