How can I resize the Zoom embedded component to fit the full width and height of its parent div in React? When I try to pass container dimensions to the Zoom client.init function, the width and height are 0. What is the best approach to ensure the Zoom component takes up 100% of its parent container’s dimensions?
Brief Answer
To make the Zoom embedded component fill its parent container in React, you need to use a combination of React refs, useEffect hooks, and ResizeObserver to detect container dimensions when they’re available. The issue occurs because the container dimensions are 0 during initial render, so you must wait for the DOM to be ready before initializing the Zoom component.
Contents
- Why container dimensions are 0 initially
- Solution using refs and useEffect
- Responsive approach with ResizeObserver
- Complete implementation example
- Handling window resizing
- Best practices and considerations
Why container dimensions are 0 initially
In React, the component rendering process happens in phases. When you try to access the dimensions of a parent div during the initial render, React hasn’t yet painted the DOM to the screen, so the dimensions are 0. This is particularly problematic with third-party SDKs like Zoom that require immediate knowledge of their container size.
The Zoom SDK’s client.init() function expects valid width and height parameters. If you pass 0 values, it either fails or renders at a default size that doesn’t match your container.
When working with React:
- The first render happens with empty refs
- The DOM is updated after render
- The parent div dimensions become available
- Only then can you properly initialize the Zoom component
Solution using refs and useEffect
The most reliable approach is to use React’s ref system to access the DOM element and useEffect to run code after the component has mounted to the DOM.
import React, { useRef, useEffect, useState } from 'react';
const ZoomMeeting = () => {
const containerRef = useRef(null);
const [zoomClient, setZoomClient] = useState(null);
const [dimensions, setDimensions] = useState({ width: 0, height: 0 });
useEffect(() => {
// Only proceed if the container is available and we haven't initialized yet
if (containerRef.current && !zoomClient) {
const { width, height } = containerRef.current.getBoundingClientRect();
setDimensions({ width, height });
// Initialize Zoom client with actual dimensions
const client = ZoomMtg.init({
debug: true,
zoomJSDomain: "your_zoom_domain",
language: "en-US",
customize: {
meetingInfo: ['topic', 'host', 'mn', 'pwd', 'telPwd', 'participant', 'dc', 'time', 'recording'],
toolbar: {
buttons: [
{
text: 'Custom Button',
className: 'CustomButton',
onClick: () => console.log('Custom button clicked')
}
]
}
},
// Use the actual container dimensions
width: width,
height: height
});
setZoomClient(client);
}
}, [containerRef, zoomClient]);
return (
<div ref={containerRef} style={{ width: '100%', height: '500px' }}>
{/* Zoom component will be rendered here */}
</div>
);
};
Responsive approach with ResizeObserver
For a truly responsive solution that handles container resizing after initial render, use the ResizeObserver API:
import React, { useRef, useEffect, useState } from 'react';
const ZoomMeeting = () => {
const containerRef = useRef(null);
const [zoomClient, setZoomClient] = useState(null);
const [dimensions, setDimensions] = useState({ width: 0, height: 0 });
const resizeObserverRef = useRef(null);
useEffect(() => {
const updateDimensions = () => {
if (containerRef.current) {
const { width, height } = containerRef.current.getBoundingClientRect();
setDimensions({ width, height });
// Reinitialize Zoom client if it already exists
if (zoomClient) {
zoomClient.join({
signature: 'your_signature',
sdkKey: 'your_sdk_key',
meetingNumber: 'your_meeting_number',
passWord: 'your_password',
userName: 'React User',
userEmail: 'user@example.com',
zak: 'your_zak',
success: (success) => {
console.log(success);
},
error: (error) => {
console.error(error);
}
});
}
}
};
// Initialize ResizeObserver
if (containerRef.current) {
resizeObserverRef.current = new ResizeObserver(updateDimensions);
resizeObserverRef.current.observe(containerRef.current);
updateDimensions(); // Initial dimension update
}
return () => {
if (resizeObserverRef.current) {
resizeObserverRef.current.disconnect();
}
};
}, [zoomClient]);
// Initialize Zoom client when dimensions are available
useEffect(() => {
if (dimensions.width > 0 && dimensions.height > 0 && !zoomClient) {
const client = ZoomMtg.init({
debug: true,
zoomJSDomain: "your_zoom_domain",
language: "en-US",
width: dimensions.width,
height: dimensions.height
});
setZoomClient(client);
}
}, [dimensions, zoomClient]);
return (
<div ref={containerRef} style={{ width: '100%', height: '500px' }}>
{/* Zoom component will be rendered here */}
</div>
);
};
Complete implementation example
Here’s a complete, production-ready implementation that handles all aspects of the Zoom component resizing:
import React, { useRef, useEffect, useState } from 'react';
import ZoomMtg from '@zoomus/websdk';
const ZoomResponsive = ({
meetingNumber,
passWord,
userName,
sdkKey,
signature,
zak,
style = {}
}) => {
const containerRef = useRef(null);
const [zoomClient, setZoomClient] = useState(null);
const [dimensions, setDimensions] = useState({ width: 0, height: 0 });
const [isInitialized, setIsInitialized] = useState(false);
const resizeObserverRef = useRef(null);
// Update dimensions when container resizes
useEffect(() => {
const updateDimensions = () => {
if (containerRef.current) {
const { width, height } = containerRef.current.getBoundingClientRect();
setDimensions({ width, height });
}
};
// Initialize ResizeObserver
if (containerRef.current) {
resizeObserverRef.current = new ResizeObserver(updateDimensions);
resizeObserverRef.current.observe(containerRef.current);
updateDimensions(); // Initial dimension update
}
return () => {
if (resizeObserverRef.current) {
resizeObserverRef.current.disconnect();
}
};
}, []);
// Initialize Zoom client when dimensions are available
useEffect(() => {
if (dimensions.width > 0 && dimensions.height > 0 && !zoomClient) {
try {
// Initialize Zoom client
const client = ZoomMtg.init({
debug: false,
zoomJSDomain: "zoom.us",
language: "en-US",
customize: {
meetingInfo: ['topic', 'host', 'mn', 'pwd', 'telPwd', 'participant', 'dc', 'time'],
toolbar: {
buttons: [
{
text: 'Leave Meeting',
className: 'CustomLeaveButton',
onClick: () => {
if (zoomClient) {
zoomClient.leaveMeeting();
}
}
}
]
}
},
width: dimensions.width,
height: dimensions.height
});
setZoomClient(client);
} catch (error) {
console.error("Failed to initialize Zoom client:", error);
}
}
}, [dimensions, zoomClient]);
// Join meeting when client is ready and meeting details are provided
useEffect(() => {
if (zoomClient && meetingNumber && sdkKey && signature && !isInitialized) {
try {
// Set up the meeting
zoomClient.join({
signature: signature,
sdkKey: sdkKey,
meetingNumber: meetingNumber,
passWord: passWord,
userName: userName || 'React User',
userEmail: 'user@example.com',
zak: zak,
success: (success) => {
console.log("Successfully joined meeting:", success);
setIsInitialized(true);
},
error: (error) => {
console.error("Error joining meeting:", error);
}
});
} catch (error) {
console.error("Failed to join meeting:", error);
}
}
}, [zoomClient, meetingNumber, sdkKey, signature, passWord, userName, zak, isInitialized]);
// Clean up Zoom client on unmount
useEffect(() => {
return () => {
if (zoomClient && isInitialized) {
try {
zoomClient.leaveMeeting();
} catch (error) {
console.error("Error leaving meeting:", error);
}
}
};
}, [zoomClient, isInitialized]);
return (
<div
ref={containerRef}
style={{
width: '100%',
height: '100%',
...style
}}
>
{/* Zoom component will be rendered here */}
</div>
);
};
export default ZoomResponsive;
Handling window resizing
If the container size changes due to window resizing, you need to ensure the Zoom component adapts accordingly. The ResizeObserver approach already handles this, but you might need additional logic if your container size is dependent on window size:
// Add this to the component with ResizeObserver
useEffect(() => {
const handleWindowResize = () => {
// The ResizeObserver will handle the resizing,
// but you might want to add custom logic here
};
window.addEventListener('resize', handleWindowResize);
return () => {
window.removeEventListener('resize', handleWindowResize);
};
}, []);
Best practices and considerations
-
Use ResizeObserver for responsive containers: This is the most reliable way to handle dynamic container sizes.
-
Debounce resize events: If you’re handling window resize events directly, debounce them to avoid performance issues:
javascriptconst debouncedHandleResize = debounce(() => { // Handle resize logic }, 100); -
Handle component unmounting: Always clean up the Zoom client when the component unmounts to prevent memory leaks.
-
Error boundaries: Wrap your Zoom component in an error boundary to handle SDK initialization failures gracefully.
-
CSS considerations: Make sure the parent container has explicit dimensions. Using percentage heights might require additional CSS:
css.zoom-container { position: absolute; top: 0; left: 0; width: 100%; height: 100%; } -
SDK version compatibility: Different versions of the Zoom SDK might have different initialization requirements. Check the documentation for your specific version.
-
Performance optimization: For complex applications, consider memoizing the Zoom component or using React’s
useCallbackfor event handlers. -
Testing: Test your implementation across different screen sizes and devices to ensure consistent behavior.
-
Accessibility: Ensure your implementation follows accessibility guidelines, especially if you’re adding custom controls.
-
Security: Keep your API keys and signatures secure and don’t expose them in client-side code when possible.
Conclusion
To properly resize the Zoom embedded component to fit its parent container in React:
- Use React refs to access the DOM element
- Initialize the Zoom client in useEffect after the DOM is mounted
- Use ResizeObserver to handle responsive resizing
- Implement proper cleanup to avoid memory leaks
- Consider performance optimizations and error handling
The key insight is that container dimensions are 0 during initial render in React, so you must wait for the DOM to be available before initializing the Zoom component. The ResizeObserver approach provides the most robust solution for handling container resizing after initial render.
For production use, implement the complete example that includes error handling, proper cleanup, and responsive behavior to ensure a smooth user experience across different devices and screen sizes.