How can I trigger actions when the close (X) button is clicked in a dialog?

Sean17 -Currently, there isn't a direct event for the close button itself, you can handle the dialog's lifecycle through the Teams SDK.

Here's how you can detect when the dialog is closed (including via the close button) and trigger an API call in a React application:

Ensure you have the Microsoft Teams JavaScript SDK installed and initialized in your React application.
Use the microsoftTeams.tasks.startTask method to open the dialog and handle its closure. The closure can be detected in the callback function provided to startTask, which will handle both cases when the dialog is submitted or closed.

Example Implementation in React

1. Install the SDK: Ensure you have the SDK installed via npm if you haven't already:

    

   npm install @microsoft/teams-js

2. Open Dialog and Handle Closure:

   jsx

   import React from 'react';
   import * as microsoftTeams from '@microsoft/teams-js';
   
   const MyComponent = () => {
     const handleOpenDialog = () => {
       microsoftTeams.initialize();
   
       microsoftTeams.tasks.startTask({
         title: "My Dialog",
         height: 300,
         width: 400,
         url: "https://your-web-app-url.com", // URL to your web app or React component
       }, (result) => {
         if (result) {
           // Dialog was submitted, handle the result if necessary
           console.log("Dialog was submitted with result:", result);
         } else {
           // Dialog was cancelled or closed
           console.log("Dialog was cancelled or closed.");
           handleApiCall(); // Trigger API call on dialog close
         }
       });
     };
   
     const handleApiCall = async () => {
       try {
         const response = await fetch('https://your-api-endpoint.com/trigger', {
           method: 'POST',
           headers: {
             'Content-Type': 'application/json',
           },
           body: JSON.stringify({ message: 'Dialog closed' }),
         });
         const data = await response.json();
         console.log("API call successful:", data);
       } catch (error) {
         console.error("Error during API call:", error);
       }
     };
   
     return (
       <div>
         <button onClick={handleOpenDialog}>Open Dialog</button>
       </div>
     );
   };
   
   export default MyComponent;