diff --git a/src/main/resources/hudson/plugins/release/pipeline/ReleaseStep/config.jelly b/src/main/resources/hudson/plugins/release/pipeline/ReleaseStep/config.jelly
index 29555a6..0b147e7 100644
--- a/src/main/resources/hudson/plugins/release/pipeline/ReleaseStep/config.jelly
+++ b/src/main/resources/hudson/plugins/release/pipeline/ReleaseStep/config.jelly
@@ -25,30 +25,16 @@ THE SOFTWARE.
 
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:f="/lib/form" xmlns:st="jelly:stapler">
+    <st:adjunct includes="hudson.plugins.release.pipeline.ReleaseStep.load-params"/>
     <j:set var="jobFieldId" value="${h.generateId()}"/>
+    <span
+            class="release-params-data"
+            data-descriptor-url="${descriptor.descriptorUrl}"
+            data-context="${descriptor.context}"/>
     <f:entry field="job" title="${%Job to Release}">
-        <f:textbox onblur="loadParams()" id="${jobFieldId}"/>
+        <f:textbox clazz="release-load-params" id="${jobFieldId}"/>
     </f:entry>
     <f:entry title="${%Parameters}">
         <div id="params"/>
-        <script>
-            function loadParams() {
-                const div = document.getElementById('params');
-                const parametersTextBox = document.getElementById('${jobFieldId}')
-
-                const url = '${descriptor.descriptorUrl}/parameters?job=' + encodeURIComponent(parametersTextBox.value) + '&amp;context=' + encodeURIComponent('${descriptor.context}')
-                fetch(url)
-                    .then(rsp => {
-                        if (rsp.ok) {
-                            rsp.text().then(responseText => {
-                                div.innerHTML = responseText;
-                                Behaviour.applySubtree(div);
-                            })
-                        } else {
-                            div.innerHTML = "<b>ERROR</b>: Failed to load parameter definitions: " + rsp.statusText;
-                        }
-                    })
-            }
-        </script>
     </f:entry>
 </j:jelly>
\ No newline at end of file
diff --git a/src/main/resources/hudson/plugins/release/pipeline/ReleaseStep/load-params.js b/src/main/resources/hudson/plugins/release/pipeline/ReleaseStep/load-params.js
new file mode 100644
index 0000000..d733ab2
--- /dev/null
+++ b/src/main/resources/hudson/plugins/release/pipeline/ReleaseStep/load-params.js
@@ -0,0 +1,25 @@
+Behaviour.specify('.release-load-params', 'release-load-params', 0, function(e) {
+    e.addEventListener('blur', function() {
+        const dataSpan = document.querySelector('.release-params-data');
+        const div = document.getElementById('params');
+
+        const url = dataSpan.dataset.descriptorUrl + '/parameters?job=' +
+            encodeURIComponent(this.value) +
+            '&context=' + encodeURIComponent(dataSpan.dataset.context);
+
+        fetch(url)
+            .then(rsp => {
+                if (rsp.ok) {
+                    return rsp.text();
+                }
+                throw new Error(rsp.statusText);
+            })
+            .then(responseText => {
+                div.innerHTML = responseText;
+                Behaviour.applySubtree(div);
+            })
+            .catch(error => {
+                div.innerHTML = '<b>ERROR</b>: Failed to load parameter definitions: ' + error.message;
+            });
+    });
+});