Here i am developing an examination system. I want to apply full screen when i launch exam component. While doing student strict to remain in full screen. When he/she exit from full screen then automatically call a function to save exam result.
There are some limitations when it comes to displaying things fullscreen but I suggest you to use https://github.com/sindresorhus/screenfull.js . It's quite well maintained and makes it easier for you to support multiple browsers.
In React you could do something like this:
// import/exports depend on your setup, this is just an example
const screenfull = require('screenfull');
class MyComponent extends React.Component {
componentDidMount() {
if (screenfull.isEnabled) {
screenfull.on('change', () => {
console.log('Am I fullscreen?', screenfull.isFullscreen ? 'Yes' : 'No');
});
}
}
// enabling fullscreen has to be done after some user input
toggleFullScreen = () => {
if (screenfull.isEnabled) {
screenfull.toggle();
}
}
render() {
return (
<button onClick={this.toggleFullScreen}>Toggle fullscreen</button>
)
}
}
LE:
To detect a fullscreen change you can use the screenfull.on('change')
event: https://github.com/sindresorhus/screenfull.js#detect-fullscreen-change
Added code for this in the above example.