JavaScript Event Handling

Owned by BrightSign TechDocs

Last updated: Jun 13, 2023

1 min read

AddEventListener

addEventListener() is a common BrightSign method that is used to listen for an event.

Syntax:

target.addEventListener(type, listener);

type string: Specifies the type of event to listen for
listener function: The object to be notified when the event (of the specified type) happens

RemoveEventListener

removeEventListener()is a common BrightSign method that is used to remove an event listener.

Syntax:

target.removeEventListener(type, listener);

type string: Specifies the type of event to listen for
listener function: The object to be notified when the event (of the specified type) happens

Example

function GPIOcontrolDown(msg){

    console.log(JSON.stringify(msg)); 
    console.log(" GPIO : " + msg.detail)
}

// to add an event listener for the "controldown" GPIO event

control_port.addEventListener("controldown", GPIOcontrolDown);

// to remove the "controldown" GPIO event listener

control_port.removeEventListener("controldown", GPIOcontrolDown);