---
sourceType: api-reference
sourceTypeMatchedRule: api-prefix
slug: MA/api/media/camera/cameraContext/flip
title: CameraContext.flip
---
Chuyển camera trước/sau

### Code sample — JS

```js
import React, { useEffect, useRef } from "react";
import { Box, Button, Page } from "zmp-ui";
import { createCameraContext, FacingMode } from "zmp-sdk/apis";

const HomePage = () => {
  const cameraRef = useRef(null);
  const videoRef = useRef(null);
  useEffect(() => {
    const videoElement = videoRef.current;
    if (!videoElement) {
      console.log("Media component not ready");
      return;
    }
    if (!cameraRef.current) {
      cameraRef.current = createCameraContext({
        videoElement: videoElement,
        mediaConstraints: {
          width: 640,
          height: 480,
          facingMode: FacingMode.BACK,
          audio: false,
        },
      });
    }
  }, []);

  return (
    <Page>
      <Box>
        
      </Box>

      <Box mt={5} flex alignContent={"center"}>
        <Button
          size={"small"}
          variant="primary"
          onClick={async () => await cameraRef.current?.start()}
        >
          Start Stream
        </Button>
        <Button
          size={"small"}
          variant="primary"
          onClick={async () => await cameraRef.current?.flip()}
        >
          Flip Camera
        </Button>
      </Box>
    </Page>
  );
};

export default HomePage;
```

### Code sample — TS

```ts
import React, { useEffect, useRef } from "react";
import { Box, Button, Page } from "zmp-ui";
import { createCameraContext, FacingMode, ZMACamera, MediaDevice } from "zmp-sdk/apis";

const HomePage = () => {
  const cameraRef = useRef<ZMACamera | null>(null);
  const videoRef = useRef<HTMLVideoElement>(null);
  const [cameraList, setCameraList] = useState<MediaDevice[]>([]);

  useEffect(() => {
    const videoElement = videoRef.current;
    if (!videoElement) {
      console.log("Media component not ready");
      return;
    }
    if (!cameraRef.current) {
      cameraRef.current = createCameraContext({
        videoElement: videoElement,
        mediaConstraints: {
          width: 640,
          height: 480,
          facingMode: FacingMode.BACK,
          audio: false,
        },
      });
    }
  }, []);

  return (
    <Page>
      <Box>
        
      </Box>

      <Box mt={5} flex alignContent={"center"}>
        <Button
          size={"small"}
          variant="primary"
          onClick={async () => await cameraRef.current?.start()}
        >
          Start Stream
        </Button>
        <Button
          size={"small"}
          variant="primary"
          onClick={async () => await cameraRef.current?.flip()}
        >
          Flip Camera
        </Button>
      </Box>
    </Page>
  );
};

export default HomePage;
```