Guide on attaching an event to every dynamically created element in JavaScript

I'm currently generating 'li' elements dynamically using a loop and running into issues when it comes to assigning events to each generated element. My goal is to assign an onclick event to every li element that is created.

Check out the code snippet below:


var notifications = [{
  "event": "It's your friend's Birthday. Wish him luck!!!",
  "view": "unread",
  "status": "read",
  "image": "<img src='cake.jpg' style='height:80px;width:80px'>"
}]

var ids = ["id1", "id2", "id3", "id4", "id5"];
var lis = new Array(10);
var i = 0;

for (i; i < notifications.length; i++) {
  lis[i] = document.createElement("li");
  var obj = document.createTextNode(notifications[i].event);
  lis[i].appendChild(obj);
  document.body.appendChild(lis[i]);
  lis[i].setAttribute('id', ids[i]);
  var x = document.getElementById(ids[i]);
  x.addEventListener("click", func('ids[i]'));
  document.body.appendChild(ids[i]);

}

function func(a) {
  document.getElementById(a).innerHTML = "hello";
}

There are also additional objects similar to the one above.

Answer №1

Consider using

x.addEventListener("click", func);

rather than

x.addEventListener("click", func());

When you use func(), the function is called and its return value is sent instead of passing the function itself.

Answer №2

One solution is to utilize the .bind method, which allows you to bind a value to an event listener. Instead of

x.addEventListener("click", func('ids[i])');
  1. By using this syntax, you are assigning the return value of func to the event listener.
  2. The string 'ids[i]' does not represent a variable, but rather a string literal.

To rectify this issue, make the following replacement:

x.addEventListener("click", func.bind(ids[i]));

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