Closure classic

Developer
Nick Williams
Size
1,842 Kb
Views
36,432
  1. Closure classic Previews
  2. Closure classic HTML Codes
  3. Closure classic JS Codes

How do I make an closure classic?

What is a closure classic? How do you make a closure classic? This script and codes were developed by Nick Williams on 27 August 2022, Saturday.

Closure classic Previews
IQ Test

Closure classic - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>closure classic</title>
</head>
<body> <p>This is a classic example of where you need a closure. Notice that every button reports the same value (the final value of <code>i</code>). The reason for this is each function shares the same scope, so each callback refers to the exact same variable <code>i</code>.</p>
<button class="without-closure">Click</button>
<button class="without-closure">Click</button>
<button class="without-closure">Click</button>
<button class="without-closure">Click</button>
<button class="without-closure">Click</button>
<p>The problem is sharing of scope, so the solution is of course to create a new scope (via a closure) for each event listener. This sounds complex but the solution is always the same: <em>create your callback/event listener within another function:</em></p>
<button class="with-closure">Click</button>
<button class="with-closure">Click</button>
<button class="with-closure">Click</button>
<button class="with-closure">Click</button>
<button class="with-closure">Click</button>
<p>The reason for this is that JavaScript (confusingly) has function-level scope, so we call another function to create a new scope.</p> <script src="js/index.js"></script>
</body>
</html>

Closure classic - Script Codes JS Codes

var buttons = document.querySelectorAll(".without-closure");
for(var i = 0, length = buttons.length; i < length; i++) { buttons[i].addEventListener("click", function() { alert(i); },false);
}
buttons = document.querySelectorAll(".with-closure");
function createCallback(value) { return function() { alert(value); }
}
for(var i = 0, length = buttons.length; i < length; i++) { buttons[i].addEventListener("click", createCallback(i),false);
}
Closure classic - Script Codes
Closure classic - Script Codes
Home Page Home
Developer Nick Williams
Username WickyNilliams
Uploaded August 27, 2022
Rating 3
Size 1,842 Kb
Views 36,432
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