Further javascript improvements

app/static/js/forms/create-job-form.js

@@ -0,0 +1,25 @@
+Forms.CreateJobForm = class CreateJobForm extends Forms.BaseForm {
+  static autoInit() {
+    let createJobFormElements = document.querySelectorAll('.create-job-form');
+    for (let createJobFormElement of createJobFormElements) {
+      new Forms.CreateJobForm(createJobFormElement);
+    }
+  }
+
+  constructor(formElement) {
+    super(formElement);
+
+    let versionField = this.formElement.querySelector('#create-job-form-version');
+    versionField.addEventListener('change', (event) => {
+      let url = new URL(window.location.href);
+      url.search = `?version=${event.target.value}`;
+      window.location.href = url.toString();
+    });
+
+    this.addEventListener('requestLoad', (event) => {
+      if (event.target.status === 201) {
+        window.location.href = event.target.getResponseHeader('Location');
+      }
+    });
+  }
+};