Difference between setCallBack and getCallBack function?
Please tell the difference between setCallBack and getCallBack function? Also, If possible can someone please tell me why what is .this function and what does this code is actually doing. (Its related to Instant Notification App https://trailhead.salesforce.com/content/learn/projects/workshop-platform-events/platform-event-subscribe)
const callback = function (message) {
console.log('Event Received : ' + JSON.stringify(message));
helper.onReceiveNotification(component, message);
};
// Subscribe to the channel and save the returned subscription object.
empApi.subscribe(channel, replayId, $A.getCallback(callback)).then($A.getCallback(function (newSubscription) {
console.log('Subscribed to channel ' + channel);
component.set('v.subscription', newSubscription);
}));
lightning-aura-components
asked 1 hour ago
Sukruti
326
add a comment |
Please tell the difference between setCallBack and getCallBack function? Also, If possible can someone please tell me why what is .this function and what does this code is actually doing. (Its related to Instant Notification App https://trailhead.salesforce.com/content/learn/projects/workshop-platform-events/platform-event-subscribe)
const callback = function (message) {
console.log('Event Received : ' + JSON.stringify(message));
helper.onReceiveNotification(component, message);
};
// Subscribe to the channel and save the returned subscription object.
empApi.subscribe(channel, replayId, $A.getCallback(callback)).then($A.getCallback(function (newSubscription) {
console.log('Subscribed to channel ' + channel);
component.set('v.subscription', newSubscription);
}));
lightning-aura-components
asked 1 hour ago
Sukruti
326
add a comment |
Please tell the difference between setCallBack and getCallBack function? Also, If possible can someone please tell me why what is .this function and what does this code is actually doing. (Its related to Instant Notification App https://trailhead.salesforce.com/content/learn/projects/workshop-platform-events/platform-event-subscribe)
const callback = function (message) {
console.log('Event Received : ' + JSON.stringify(message));
helper.onReceiveNotification(component, message);
};
// Subscribe to the channel and save the returned subscription object.
empApi.subscribe(channel, replayId, $A.getCallback(callback)).then($A.getCallback(function (newSubscription) {
console.log('Subscribed to channel ' + channel);
component.set('v.subscription', newSubscription);
}));
lightning-aura-components
asked 1 hour ago
Sukruti
326
Please tell the difference between setCallBack and getCallBack function? Also, If possible can someone please tell me why what is .this function and what does this code is actually doing. (Its related to Instant Notification App https://trailhead.salesforce.com/content/learn/projects/workshop-platform-events/platform-event-subscribe)
const callback = function (message) {
console.log('Event Received : ' + JSON.stringify(message));
helper.onReceiveNotification(component, message);
};
// Subscribe to the channel and save the returned subscription object.
empApi.subscribe(channel, replayId, $A.getCallback(callback)).then($A.getCallback(function (newSubscription) {
console.log('Subscribed to channel ' + channel);
component.set('v.subscription', newSubscription);
}));
lightning-aura-components
lightning-aura-components
asked 1 hour ago
Sukruti
326
asked 1 hour ago
Sukruti
326
edited 1 hour ago
asked 1 hour ago
Sukruti
326
asked 1 hour ago
Sukruti
326
asked 1 hour ago
Sukruti
326
326
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
action.setCallback() is used to provide a callback function when making a call to a server-side Apex controller:
var action = component.get("c.someMethod");
action.setParams({ param: cmp.get("v.aParameter") });
action.setCallback(this, function(response) {
// Do things.
}
$A.enqueueAction(action);
$A.getCallback() is used when passing a callback function to a function outside the Lightning framework that might interact with a component outside the normal rendering lifecycle, such as setTimeout():
window.setTimeout(
$A.getCallback(function() {
cmp.set("v.visible", true);
}), 5000
);
You do not need to use $A.getCallback() when interacting with Apex server controller methods.
The code that you posted is using the <lightning:empApi> component to subscribe to a Platform Event. The subscription is handled by a JavaScript library that speaks the CometD protocol and callbacks are performed asynchronously at any time. Hence the use case falls into the realm of $A.getCallback() as described above.
answered 1 hour ago
David Reed
29.5k61746
Thanks David for explanation. So the getCallBack method will execute when we are calling a method that is not part of aura framework. If possible can tell please tell me how below code is working:
– Sukruti
1 hour ago
If you have specific code, please edit it into your question.
– David Reed
1 hour ago
Hi David, Please let me know if you can help here.
– Sukruti
1 hour ago
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
action.setCallback() is used to provide a callback function when making a call to a server-side Apex controller:
var action = component.get("c.someMethod");
action.setParams({ param: cmp.get("v.aParameter") });
action.setCallback(this, function(response) {
// Do things.
}
$A.enqueueAction(action);
$A.getCallback() is used when passing a callback function to a function outside the Lightning framework that might interact with a component outside the normal rendering lifecycle, such as setTimeout():
window.setTimeout(
$A.getCallback(function() {
cmp.set("v.visible", true);
}), 5000
);
You do not need to use $A.getCallback() when interacting with Apex server controller methods.
The code that you posted is using the <lightning:empApi> component to subscribe to a Platform Event. The subscription is handled by a JavaScript library that speaks the CometD protocol and callbacks are performed asynchronously at any time. Hence the use case falls into the realm of $A.getCallback() as described above.
answered 1 hour ago
David Reed
29.5k61746
Thanks David for explanation. So the getCallBack method will execute when we are calling a method that is not part of aura framework. If possible can tell please tell me how below code is working:
– Sukruti
1 hour ago
If you have specific code, please edit it into your question.
– David Reed
1 hour ago
Hi David, Please let me know if you can help here.
– Sukruti
1 hour ago
add a comment |
action.setCallback() is used to provide a callback function when making a call to a server-side Apex controller:
var action = component.get("c.someMethod");
action.setParams({ param: cmp.get("v.aParameter") });
action.setCallback(this, function(response) {
// Do things.
}
$A.enqueueAction(action);
$A.getCallback() is used when passing a callback function to a function outside the Lightning framework that might interact with a component outside the normal rendering lifecycle, such as setTimeout():
window.setTimeout(
$A.getCallback(function() {
cmp.set("v.visible", true);
}), 5000
);
You do not need to use $A.getCallback() when interacting with Apex server controller methods.
The code that you posted is using the <lightning:empApi> component to subscribe to a Platform Event. The subscription is handled by a JavaScript library that speaks the CometD protocol and callbacks are performed asynchronously at any time. Hence the use case falls into the realm of $A.getCallback() as described above.
answered 1 hour ago
David Reed
29.5k61746
Thanks David for explanation. So the getCallBack method will execute when we are calling a method that is not part of aura framework. If possible can tell please tell me how below code is working:
– Sukruti
1 hour ago
If you have specific code, please edit it into your question.
– David Reed
1 hour ago
Hi David, Please let me know if you can help here.
– Sukruti
1 hour ago
add a comment |
action.setCallback() is used to provide a callback function when making a call to a server-side Apex controller:
var action = component.get("c.someMethod");
action.setParams({ param: cmp.get("v.aParameter") });
action.setCallback(this, function(response) {
// Do things.
}
$A.enqueueAction(action);
$A.getCallback() is used when passing a callback function to a function outside the Lightning framework that might interact with a component outside the normal rendering lifecycle, such as setTimeout():
window.setTimeout(
$A.getCallback(function() {
cmp.set("v.visible", true);
}), 5000
);
You do not need to use $A.getCallback() when interacting with Apex server controller methods.
The code that you posted is using the <lightning:empApi> component to subscribe to a Platform Event. The subscription is handled by a JavaScript library that speaks the CometD protocol and callbacks are performed asynchronously at any time. Hence the use case falls into the realm of $A.getCallback() as described above.
answered 1 hour ago
David Reed
29.5k61746
action.setCallback() is used to provide a callback function when making a call to a server-side Apex controller:
var action = component.get("c.someMethod");
action.setParams({ param: cmp.get("v.aParameter") });
action.setCallback(this, function(response) {
// Do things.
}
$A.enqueueAction(action);
$A.getCallback() is used when passing a callback function to a function outside the Lightning framework that might interact with a component outside the normal rendering lifecycle, such as setTimeout():
window.setTimeout(
$A.getCallback(function() {
cmp.set("v.visible", true);
}), 5000
);
You do not need to use $A.getCallback() when interacting with Apex server controller methods.
The code that you posted is using the <lightning:empApi> component to subscribe to a Platform Event. The subscription is handled by a JavaScript library that speaks the CometD protocol and callbacks are performed asynchronously at any time. Hence the use case falls into the realm of $A.getCallback() as described above.
answered 1 hour ago
David Reed
29.5k61746
edited 1 hour ago
answered 1 hour ago
David Reed
29.5k61746
answered 1 hour ago
David Reed
29.5k61746
answered 1 hour ago
David Reed
29.5k61746
29.5k61746
Thanks David for explanation. So the getCallBack method will execute when we are calling a method that is not part of aura framework. If possible can tell please tell me how below code is working:
– Sukruti
1 hour ago
If you have specific code, please edit it into your question.
– David Reed
1 hour ago
Hi David, Please let me know if you can help here.
– Sukruti
1 hour ago
add a comment |
Thanks David for explanation. So the getCallBack method will execute when we are calling a method that is not part of aura framework. If possible can tell please tell me how below code is working:
– Sukruti
1 hour ago
If you have specific code, please edit it into your question.
– David Reed
1 hour ago
Hi David, Please let me know if you can help here.
– Sukruti
1 hour ago
Thanks David for explanation. So the getCallBack method will execute when we are calling a method that is not part of aura framework. If possible can tell please tell me how below code is working:
– Sukruti
1 hour ago
Thanks David for explanation. So the getCallBack method will execute when we are calling a method that is not part of aura framework. If possible can tell please tell me how below code is working:
– Sukruti
1 hour ago
If you have specific code, please edit it into your question.
– David Reed
1 hour ago
If you have specific code, please edit it into your question.
– David Reed
1 hour ago
Hi David, Please let me know if you can help here.
– Sukruti
1 hour ago
Hi David, Please let me know if you can help here.
– Sukruti
1 hour ago
add a comment |
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