How to use settimeout function in the lightning component?
I am new to the lightning components and trying to understand how can I use the settimeout function inside my component.
I'm trying to do this, but always getting errors and the component is crashing.
Thanks for the help in advance!
My code:
({ init : function(component, event, helper) { helper.showSpinner(component); var isValid; var recordId = component.get("v.recordId"); var action = component.get("c.functionFromClass"); action.setParams({ Id : recordId }); action.setCallback(this, function(response){ var state = response.getState(); if (state === "SUCCESS"){ isValid = response.getReturnValue(); alert(isValid); $A.get("e.force:closeQuickAction").fire(); $A.get('e.force:refreshView').fire(); } else{ console.log("Unknown error"); component.set("v.errorMessage", "Unknown error"); } helper.hideSpinner(component); }); $A.enqueueAction(action); }
}
What are settimeout function?
Settimeout Function
The setTimeout function is a native JavaScript function. It sets a timer (a countdown set in milliseconds) for the execution of a callback function, calling the function upon completion of the timer.
As per doc, Use $A.getCallback() to wrap any code that modifies a component outside the normal rerendering lifecycle, such as in a setTimeout() call. The $A.getCallback() call ensures that the framework rerenders the modified component and processes any enqueued actions.
An example of where you need to use $A.getCallback() is calling window.setTimeout() in an event handler to execute some logic after a time delay. This puts your code outside the framework's call stack.
This sample sets the visible attribute on a component to true after a five-second delay.
window.setTimeout( $A.getCallback(function() { cmp.set("v.visible", true); }), 5000 );In your case, You can do like this:-
action.setCallback(this, function(response){ var state = response.getState(); if (state === "SUCCESS"){ isValid = response.getReturnValue(); window.setTimeout( $A.getCallback(function() { alert(isValid); }), 5000 ); $A.get("e.force:closeQuickAction").fire(); $A.get('e.force:refreshView').fire(); } else{ console.log("Unknown error"); component.set("v.errorMessage", "Unknown error"); } helper.hideSpinner(component); });
Answer (1)
In Salesforce Lightning Components, you cannot use JavaScript's setTimeout() function directly because of the Lightning Component framework's event-driven architecture. However, you can achieve similar functionality using the setTimeout() function within a JavaScript controller/helper file associated with your Lightning Component.
Here's how you can use the setTimeout() function in a Lightning Component:
Create a JavaScript Controller or Helper:
If you haven't already, create a JavaScript controller or helper file for your Lightning Component. You can do this by navigating to the Developer Console or your IDE where you're developing your Salesforce code.
Write the JavaScript Function:
In your controller or helper file, define a function that contains the logic you want to execute after a certain delay using setTimeout(). For example:
({ myFunction: function(component, event, helper) {
// Logic to be executed after a delay
setTimeout(function() {
// Your code here
console.log('Delayed function executed');
}, 3000); // Delay in milliseconds (e.g., 3000 ms = 3 seconds)
}
})Call the Function from Your Lightning Component:
Once you've defined your function, you can call it from your Lightning Component's markup or controller code. For example:
Handle any Required Logic:
Inside the setTimeout() function, you can include any logic you want to execute after the specified delay. This could include updating component attributes, making server calls, or performing any other actions as needed.
Testing and Debugging:
Test your Lightning Component to ensure that the setTimeout() function behaves as expected. Use browser developer tools (e.g., Chrome DevTools) to debug any issues that may arise.
By following these steps, you can effectively use the setTimeout() function within a Lightning Component to execute code after a specified delay.