1 result found

1. UXP, InDesign: WebView postMessage does not work in 20.4

   Since version 20.4 of InDesign, sending messages to the WebView element no longer works. Here is a dummy plugin to reproduce the behavior.

   https://kdrive.infomaniak.com/app/share/1606376/dbdbc8c1-10c3-4c9a-b4ce-d048fc2864fd

   How to test?
   Click on the “Send message” button.

   Expected behavior?
   The message “Hello form panel!” appears in the Webview element (white background).

   In InDesign 20.3 it works, from 20.4 no longer.

   Why is this important?
   This affects the functionality of one of my published plugins.

   Code:

   Plugin:
   const sendMessageButtonElem = document.getElementById("send-message-button");
   sendMessageButtonElem?.addEventListener("click", () => {
   /* Send message to WebView */
   const webviewElem = document.getElementById("webview") ;
   webviewElem.postMessage({
   "message": "Hello from panel!"
   });
   });

   ---

   Webview:
   /**
   * Window message event listener
   * Receive messages from Plugin
   */
   window.addEventListener("message", panelMessageHandler);

   /**
   * Panel message handler
   * @param evt
   * @returns
   */
   async function panelMessageHandler(evt: MessageEvent) {
   const webviewMessageOutputElem = document.getElementById("webview-message-output") as HTMLElement;
   webviewMessageOutputElem.textContent = evt.data.message;
   }

   Since version 20.4 of InDesign, sending messages to the WebView element no longer works. Here is a dummy plugin to reproduce the behavior.

   https://kdrive.infomaniak.com/app/share/1606376/dbdbc8c1-10c3-4c9a-b4ce-d048fc2864fd

   How to test?
   Click on the “Send message” button.

   Expected behavior?
   The message “Hello form panel!” appears in the Webview element (white background).

   In InDesign 20.3 it works, from 20.4 no longer.

   Why is this important?
   This affects the functionality of one of my published plugins.

   Code:

   Plugin:
   const sendMessageButtonElem = document.getElementById("send-message-button");
   sendMessageButtonElem?.addEventListener("click", () => {
   /* Send message to WebView */
   const webviewElem = document.getElementById("webview") ;
   webviewElem.postMessage({
   "message": "Hello from panel!"
   });
   });

   ---

   Webview:
   /**… more

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   2 comments  ·  UXP plugins  ·  Delete…  ·  Admin →
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   FIXED  ·  AdminSanyam Talwar (Senior Lead Software Engineer, Adobe InDesign) responded

   The fix of the issue is now available in the latest InDesign 2026(v21.0.0.192). We recommend you upgrade to the latest version for the fix.

   If you are unable to see the update, go to the Creative Cloud application, click on the context menu on the top right, and click on Check for App Updates.

   —

   Adobe InDesign Team