add submitter completed redirect url

app/javascript/form.js

@@ -19,6 +19,7 @@ window.customElements.define('submission-form', class extends HTMLElement {
       withTypedSignature: this.dataset.withTypedSignature !== 'false',
       values: reactive(JSON.parse(this.dataset.values)),
       completedButton: JSON.parse(this.dataset.completedButton),
+      completedRedirectUrl: this.dataset.completedRedirectUrl,
       attachments: reactive(JSON.parse(this.dataset.attachments)),
       fields: JSON.parse(this.dataset.fields)
     })

app/javascript/submission_form/form.vue

@@ -332,9 +332,9 @@
         v-else
         :is-demo="isDemo"
         :attribution="attribution"
-        :completed-button="completedButton"
-        :with-send-copy-button="withSendCopyButton"
-        :with-download-button="withDownloadButton"
+        :completed-button="completedRedirectUrl ? {} : completedButton"
+        :with-send-copy-button="withSendCopyButton && !completedRedirectUrl"
+        :with-download-button="withDownloadButton && !completedRedirectUrl"
         :with-confetti="withConfetti"
         :can-send-email="canSendEmail && !!submitter.email"
         :submitter-slug="submitterSlug"
@@ -496,6 +496,11 @@ export default {
       required: false,
       default: true
     },
+    completedRedirectUrl: {
+      type: String,
+      required: false,
+      default: ''
+    },
     completedButton: {
       type: Object,
       required: false,
@@ -784,6 +789,10 @@ export default {
             if (respData) {
               this.onComplete(JSON.parse(respData))
             }
+
+            if (this.completedRedirectUrl) {
+              window.location.href = this.completedRedirectUrl
+            }
           }
         }).catch(error => {
           console.error(error)