Node.js Event Handling
Node.js Event
Handling
Hans Yip
Format of Node.js API/function call
API_function("data_here", callback_function_name(var_data));Callback_function_name(var_data) {// function content
}
OR (No name function)
API_function("data_here", (var_data) => {// function content
});
Examples of Event
•
Examples of event: phone_ring, door_bell_ring
•
We need to create event handler (function/program) to take care of the
event:
phone_ring_handler () {Pick up the phone;
Ask the person’s name;
Write down the message;
Hang up the phone;
Return message;
}
Examples of Event
•
Start the event:
when phone_ring (phone_ring_handler(), callback_function1(msg));
•
Define callback function:
callback_function1(msg) {send “msg” to hans;
exit;
}
Note:
You can re-write callback_function1 to be a no-name function.
Explore Node.js event handling with examples of creating event handlers, defining callback functions, and starting events like phone ringing. Learn how to effectively manage events in Node.js programming.
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Presentation Transcript
Node.js Event Handling Hans Yip
Format of Node.js API/function call API_function("data_here", callback_function_name(var_data)); Callback_function_name(var_data) { // function content } OR (No name function) API_function("data_here", (var_data) => { // function content });
Examples of Event Examples of event: phone_ring, door_bell_ring We need to create event handler (function/program) to take care of the event: phone_ring_handler () { Pick up the phone; Ask the person s name; Write down the message; Hang up the phone; Return message; }
Examples of Event Start the event: when phone_ring (phone_ring_handler(), callback_function1(msg)); Define callback function: callback_function1(msg) { send msg to hans; exit; } Note: You can re-write callback_function1 to be a no-name function.
