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jQuery - each method usage examples

14 points
Created by:
maryam
791

In this quick article, we are going to discuss how to use jQuery each method. There are two cases where we can use $.each method: arrays and objects.

Quick overview:

  • each method with arrays
var array = ['item 1', 'item 2', 'item 3'];

$.each(array, function(index, item) {
    console.log(index + ': ' + item);
});
  • each method with objects
var object = {
	'key 1': 'item 1',
	'key 2': 'item 2',
	'key 3': 'item 3'
};

$.each(object, function(key, item) {
	console.log(key + ': ' + item);
});
  • each method with jQuery objects
var $elements = $('.some-class-name'); // by any css selector
        
$elements.each(function(index, element) {
    console.log(index + ': ' + $(element).text());
});

More detailed method description is placed below.

1. Iterating over array example

jQuery does not add each method to array. It is necessary to access it via $.each call.

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
<head>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script>
</head>
<body>
  <script>

    $(document).ready(function() {
        var array = ['item 1', 'item 2', 'item 3'];

        $.each(array, function(index, item) {
            console.log(index + ': ' + item);
        });
    });
   
  </script>
</body>
</html>

2. Iterating over object example

jQuery does not add each method to object. It is necessary to access it via $.each call.

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
<head>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script>
</head>
<body>
  <script>

    $(document).ready(function() {
        var object = {
            'key 1': 'item 1',
            'key 2': 'item 2',
            'key 3': 'item 3'
        };

        $.each(object, function(key, item) {
            console.log(key + ': ' + item);
        });
    });
   
  </script>
</body>
</html>

3. Iterating over jQuery object example

jQuery object used on DOM is able to keep many element handles. It is possible to iterate over them with $.prototype.each method call. Below example shows how to iterate with jQuery for each over html unordered list and print it to browser console. Run below example to see the results.

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
<head>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script>
</head>
<body>
  <ul>
    <li>item 1</li>
    <li>item 2</li>
    <li>item 3</li>
  </ul>
  <script>

    $(document).ready(function() {
        var $elements = $('li'); // all li tags
        
        $elements.each(function(index, element) {
            var $element = $(element); // $(this)
            console.log(index + ': ' + $element.text());
        });
    });
   
  </script>
</body>
</html>

 

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