Creating javascript hooks possible?

Question

Is it possible to create a hook system in javascript as like as php ?

for an example ----

function myjsfunction(){

    call_my_function('handle_name');

}

now whatever function people add with 'handle' name it should get executed there.

like

add_to_function('handle_name', function(){alert('hi')});
add_to_function('handle_name', function(){alert('hello')});

both these functions should execute

So you are looking for js and php answer?

Justinas
– Justinas

2017-07-12 10:16:06 +00:00
Commented Jul 12, 2017 at 10:16 — Justinas
– Justinas, Commented Jul 12, 2017 at 10:16
js anwer actually

Alice
– Alice

2017-07-12 10:18:37 +00:00
Commented Jul 12, 2017 at 10:18 — Alice
– Alice, Commented Jul 12, 2017 at 10:18

Jonas Wilms · Accepted Answer · 2018-09-11 05:47:08Z

4

var hooks = {};

function add_to_function(name, func) {
  if(!hooks[name]) hooks[name] = [];
  hooks[name].push(func);
}

function call_my_function(name, ...params){
  if(hooks[name]) 
     hooks[name].forEach(func => func(...params));
}

As functions are first class in js you can simply store them in an object.

Usecase:

add_to_function("log", console.log.bind(console, "this will log "));

call_my_function("log", "sth cool!");

Implementation with an IIFE:

http://jsbin.com/joxigabeyi/edit?console

edited Sep 11, 2018 at 5:47

answered Jul 12, 2017 at 10:14

Jonas Wilms

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3 Comments

Alice Over a year ago

WOW !!! going to try now, but is it possible avoiding that var hooks user defined variable ? means something global like dom or anything else... so that it will not be dependent of that user variable initialization

Alice Over a year ago

IIFE ? i am really not aware of this :(

Jonas Wilms Over a year ago

@alice see updated snippet. BTW Immediatly Invoked Function Expression...

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