refactor switch into a key value handler object

tidy up - remove logs and comments

update windowed modals to use postMessage

packages/builder/src/components/design/AppPreview/CurrentItemPreview.svelte

@@ -33,6 +33,16 @@
     .instanceName("Content Placeholder")
     .json()
   
+  // Messages that can be sent from the iframe preview to the builder
+  // Budibase events are and initalisation events
+  const MessageTypes = {
+    IFRAME_LOADED: "iframe-loaded",
+    READY: "ready",
+    ERROR: "error",
+    BUDIBASE: "type",
+    KEYDOWN: "keydown"
+  }
+
   // Construct iframe template
   $: template = iframeTemplate.replace(
     /\{\{ CLIENT_LIB_PATH }}/,
@@ -80,46 +90,44 @@
   // Refresh the preview when required
   $: refreshContent(strippedJson)
 
-  onMount(() => {
-    // Initialise the app when mounted
-    iframe.contentWindow.addEventListener(
-      "ready",
-      () => {
+  function receiveMessage(message) {
+    const handlers = {
+      [MessageTypes.READY]: () => {
+        // Initialise the app when mounted
         // Display preview immediately if the intelligent loading feature
         // is not supported
+        if (!loading) return
+
         if (!$store.clientFeatures.intelligentLoading) {
           loading = false
         }
         refreshContent(strippedJson)
       },
-      { once: true }
-    )
-
-    // Catch any app errors
-    iframe.contentWindow.addEventListener(
-      "error",
-      event => {
+      [MessageTypes.ERROR]: event => {
+        // Catch any app errors
         loading = false
-        error = event.detail || "An unknown error occurred"
+        error = event.error || "An unknown error occurred"
       },
-      { once: true }
-    )
+      [MessageTypes.KEYDOWN]: handleKeydownEvent
+    }
 
-    // Add listener for events sent by client library in preview
-    iframe.contentWindow.addEventListener("bb-event", handleBudibaseEvent)
-    iframe.contentWindow.addEventListener("keydown", handleKeydownEvent)
+    const messageHandler = handlers[message.data.type] || handleBudibaseEvent
+    messageHandler(message)
+  }
+
+  onMount(() => {
+    window.addEventListener("message", receiveMessage)
   })
 
   // Remove all iframe event listeners on component destroy
   onDestroy(() => {
     if (iframe.contentWindow) {
-      iframe.contentWindow.removeEventListener("bb-event", handleBudibaseEvent)
-      iframe.contentWindow.removeEventListener("keydown", handleKeydownEvent)
+      window.removeEventListener("message", receiveMessage) //
     }
   })
 
   const handleBudibaseEvent = event => {
-    const { type, data } = event.detail
+    const { type, data } = event.data
     if (type === "select-component" && data.id) {
       store.actions.components.select({ _id: data.id })
     } else if (type === "update-prop") {
@@ -151,13 +159,14 @@
         store.actions.components.paste(destination, data.mode)
       }
     } else {
-      console.warning(`Client sent unknown event type: ${type}`)
+      console.warn(`Client sent unknown event type: ${type}`)
     }
   }
 
   const handleKeydownEvent = event => {
+    const { key } = event.data
     if (
-      (event.key === "Delete" || event.key === "Backspace") &&
+      (key === "Delete" || key === "Backspace") &&
       selectedComponentId &&
       ["input", "textarea"].indexOf(
         iframe.contentWindow.document.activeElement?.tagName.toLowerCase()

packages/builder/src/components/design/AppPreview/iframeTemplate.js

@@ -84,17 +84,20 @@ export default `
           if (window.loadBudibase) {
             window.loadBudibase()
             document.documentElement.classList.add("loaded")
-            window.dispatchEvent(new Event("iframe-loaded"))
+            window.parent.postMessage({ type: "iframe-loaded" })
           } else {
             throw "The client library couldn't be loaded"
           }
         } catch (error) {
-          window.dispatchEvent(new CustomEvent("error", { detail: error }))
+          window.parent.postMessage({ type: "error", error })
         }
       }
 
       window.addEventListener("message", receiveMessage)
-      window.dispatchEvent(new Event("ready"))
+      window.addEventListener("keydown", evt => {
+        window.parent.postMessage({ type: "keydown", key: event.key })
+      })
+      window.parent.postMessage({ type: "ready" })
     </script>
   </head>
   <body/>

packages/client/src/components/overlay/PeekScreenDisplay.svelte

@@ -8,6 +8,12 @@
   import { Modal, ModalContent, ActionButton } from "@budibase/bbui"
   import { onDestroy } from "svelte"
 
+  const MessageTypes = {
+    NOTIFICATION: "notification",
+    CLOSE_SCREEN_MODAL: "close-screen-modal",
+    INVALIDATE_DATASOURCE: "invalidate-datasource",
+  }
+
   let iframe
   let listenersAttached = false
 
@@ -21,32 +27,33 @@
     notificationStore.actions.send(message, type, icon)
   }
 
+  function receiveMessage(message) {
+    const handlers = {
+      [MessageTypes.NOTIFICATION]: () => {
+        proxyNotification(message.data)
+      },
+      [MessageTypes.CLOSE_SCREEN_MODAL]: peekStore.actions.hidePeek,
+      [MessageTypes.INVALIDATE_DATASOURCE]: () => {
+        invalidateDataSource(message.data)
+      },
+    }
+
+    const messageHandler = handlers[message.data.type]
+    if (messageHandler) {
+      messageHandler(message)
+    } else {
+      console.warning("Unknown event type", message?.data?.type)
+    }
+  }
+
   const attachListeners = () => {
     // Mirror datasource invalidation to keep the parent window up to date
-    iframe.contentWindow.addEventListener(
-      "invalidate-datasource",
-      invalidateDataSource
-    )
-    // Listen for a close event to close the screen peek
-    iframe.contentWindow.addEventListener(
-      "close-screen-modal",
-      peekStore.actions.hidePeek
-    )
-    // Proxy notifications back to the parent window instead of iframe
-    iframe.contentWindow.addEventListener("notification", proxyNotification)
+    window.addEventListener("message", receiveMessage)
   }
 
   const handleCancel = () => {
     peekStore.actions.hidePeek()
-    iframe.contentWindow.removeEventListener(
-      "invalidate-datasource",
-      invalidateDataSource
-    )
-    iframe.contentWindow.removeEventListener(
-      "close-screen-modal",
-      peekStore.actions.hidePeek
-    )
-    iframe.contentWindow.removeEventListener("notification", proxyNotification)
+    window.removeEventListener("message", receiveMessage)
   }
 
   const handleFullscreen = () => {

packages/client/src/stores/builder.js

@@ -4,11 +4,7 @@ import { findComponentById, findComponentPathById } from "../utils/components"
 import { pingEndUser } from "../api"
 
 const dispatchEvent = (type, data = {}) => {
-  window.dispatchEvent(
-    new CustomEvent("bb-event", {
-      detail: { type, data },
-    })
-  )
+  window.parent.postMessage({ type, data })
 }
 
 const createBuilderStore = () => {

packages/client/src/stores/notification.js

@@ -26,11 +26,19 @@ const createNotificationStore = () => {
 
     // If peeking, pass notifications back to parent window
     if (get(routeStore).queryParams?.peek) {
-      window.dispatchEvent(
-        new CustomEvent("notification", {
-          detail: { message, type, icon },
-        })
-      )
+      window.parent.postMessage({
+        type: "notification",
+        detail: {
+          message,
+          type,
+          icon,
+        },
+      })
+      // window.dispatchEvent(
+      //   new CustomEvent("notification", {
+      //     detail: { message, type, icon },
+      //   })
+      // )
       return
     }
 

packages/server/src/integrations/utils.ts

@@ -124,7 +124,10 @@ function copyExistingPropsOver(
   return table
 }
 
-export function finaliseExternalTables(tables: { [key: string]: any }, entities: { [key: string]: any }) {
+export function finaliseExternalTables(
+  tables: { [key: string]: any },
+  entities: { [key: string]: any }
+) {
   const finalTables: { [key: string]: any } = {}
   const errors: { [key: string]: string } = {}
   for (let [name, table] of Object.entries(tables)) {