eventBus.once¶
The once method allows to listen to an event only until it fires once. Then the listener is being removed.
Input parameters¶
messageName¶
messageName is a mandatory parameter of the string type which represents the name of the message to listen to.
listener¶
listener is a mandatory parameter of type TMessageListener which represents a callback for the event emission.
Example¶
To listen to the event until it fires once by the Event Bus you can use the once method:
useStorefront(async (storefront) => {
storefront.eventBus.once('example-event', () => {
console.log('Listening to the event...')
});
});
Example¶
You can have multiple listeners for every event:
useStorefront(async (storefront) => {
storefront.eventBus.on('example-event', () => {
console.log('Listening to the event...')
});
storefront.eventBus.on('example-event', () => {
console.log('Listening to the event twice...')
});
storefront.eventBus.once('example-event', () => {
console.log('Listening to the event thrice...')
});
});