JavaScript Event Handling
AddEventListener
addEventListener()
is a common BrightSign method that is used to listen for an event.
Syntax:
target.addEventListener(type, listener);
type
string:Â Specifies the type of event to listen forlistener
function:Â The object to be notified when the event (of the specifiedÂtype
) happensÂ
RemoveEventListener
removeEventListener()
is a common BrightSign method that is used to remove an event listener.
Syntax:
target.removeEventListener(type, listener);
type
string:Â Specifies the type of event to listen forlistener
function:Â Â The object to be notified when the event (of the specifiedÂtype
) happensÂ
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);