How to execute multiple functions on multiple button clicks?

Question

I have a list of buttons, each of these when clicked should console log the results of a different function.

<button>Log baseData</button>
<button>Log baseData in reverse</button>
<button>Log baseData without first item</button>
<button>Log each baseData entry as a new log</button>

I have tried a forEach loop, but can't figure out how to select each of these and fire different functions without adding an onClick attribute to the selected element. Any ideas? Thanks

let btns = document.querySelectorAll('button');

btns.forEach((i)=>{
  i.addEventListener('click', ()=>{
    console.log(baseData, i);
  });
});

It's not clear to me what you mean. Are you looking to assign different functions to each button? If so, how will you know which function to assign to which button? And where are those functions? — David
– David, Commented Aug 25, 2021 at 16:38
Hi David, I'm looking to assign different functions to each button. E.g. if first buttons is clicked => console.log (baseData), if second button is clicked => console.log (somethingElse) — Norbert Girch
– Norbert Girch, Commented Aug 25, 2021 at 16:40
The easiest way would be to assign a unique id to each button then in js select the button with the id and link the correct function — litelite
– litelite, Commented Aug 25, 2021 at 16:41
@NaomiGirch: Then why not something like: btns[0].addEventListener(...); btns[1].addEventListener(...); and so on? — David
– David, Commented Aug 25, 2021 at 16:42

David · Accepted Answer · 2021-08-25 16:46:40Z

You have a collection of button elements:

let btns = document.querySelectorAll('button');

According to comments on the question:

I'm looking to assign different functions to each button. E.g. if first buttons is clicked => console.log (baseData), if second button is clicked => console.log (somethingElse)

and:

I'll have to go with the current markup.

Then the "first button" is btns[0], the "second button" is btns[1], and so on. You can just assign handlers to each one:

let btns = document.querySelectorAll('button');

btns[0].addEventListener('click', ()=>{
  console.log(baseData);
});

btns[1].addEventListener('click', ()=>{
  console.log(somethingElse);
});

// etc.

This generally isn't a recommended approach because if the markup ever changes then you could be assigning the wrong functionality to each button. But if you are indeed tightly coupled to the exact markup you have then this is probably all you can do. At a business level the responsibility of that coupling is held by whatever prevents the markup from being modified.

Michal Karbownik · Accepted Answer · 2021-08-27 07:49:49Z

0

You can define an object with connections buttonId-functionName and do something like:

function handler1() {
  console.log(1);
}

function handler2() {
  console.log(2);
}

function handler3() {
  console.log(3);
}

function handler4() {
  console.log(4);
}

const btns = document.querySelectorAll('button');
const handlers = {
  func1: handler1,
  func2: handler2,
  func3: handler3,
  func4: handler4,
}

btns.forEach(btn => {
  const id = btn.getAttribute('id');
  btn.addEventListener('click', handlers[id]);
});

<button id="func1">Log baseData</button>
<button id="func2">Log baseData in reverse</button>
<button id="func3">Log baseData without first item</button>
<button id="func4">Log each baseData entry as a new log</button>

edited Aug 27, 2021 at 7:49

Michal Karbownik

1,47719 silver badges32 bronze badges

answered Aug 25, 2021 at 16:48

Tina Gordienko_Drog

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