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JavaScript - simple pagination / pager component example in Vanilla JS

6 points
Created by:
Saim-Mccullough
388

In this article, we are going to show how to create a simple pagination component with pure JavaScript.

Let's suppose we have few variables that describe pages:

  • pageNumber - current pageĀ number counted from 1 to upĀ (1, 2, 3, ...),
  • pagesCount - total number of pages,
  • radiusSize - maximal number of buttons visible on both sides of active page button.
Custom pager component example in Vanilla JS.
Custom pager component example in Vanilla JS.

DOM API based example

As radius, we understand a number of items displayed on the left and right side of the current page button.

Note: using component, replaceĀ /path/to/page/... with correct url.

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
<head>
  <style>

    div.pager {
    	padding: 20px 0;
    }
    
    a.link { 
    	padding: 5px 10px;
      	text-decoration: none;
      	color: #007bff;
    }

    a.button { 
      	padding: 5px 10px;
      	border: 1px solid;
      	border-radius: 3px;
      	text-decoration: none;
    }
    
    a.button + a.button {
    	margin-left: 5px;
    }
    
    a.button.default {
      	border-color: #66b0ff;
    	background-color: white;
      	color: #007bff;
    }
    
    a.button.default:hover {
    	border-color: #007bff;
        background-color: #e0efff;
    }
    
    a.button.selected {
    	border-color: #007bff;
        background-color: #007bff;
      	color: white;
    }

  </style>
</head>
<body>
  <div id="pager-container"></div>
  <script>
    
    function calculateRange(pageNumber, pagesCount, radiusSize) {
        var start = pageNumber - radiusSize;
        if (start < 1) {
            return {
                start: 1,
                stop: Math.min(2 * radiusSize + 1, pagesCount),
            };
        }
        var stop = pageNumber + radiusSize;
        if (stop > pagesCount) {
            return {
                start: Math.max(1, pagesCount - 2 * radiusSize),
                stop: pagesCount,
            };
        }
        return { start, stop };
    }

    function addButton(parent, style, path, text) {
        var button = document.createElement('a');
      
        button.className = style;
        button.innerText = text;
        button.href = path;
      
        parent.appendChild(button);
    };
    
    function addPager(parent, pageNumber, pagesCount, radiusSize) {
    	var range = calculateRange(pageNumber, pagesCount, radiusSize);
      
      	var pager = document.createElement('div');
      	pager.className = 'pager';
      
      	addButton(pager, 'link', '/path/to/page/1', 'First');
      
      	for (var i = range.start; i <= range.stop; ++i) {
          	var style = 'button ' + (i === pageNumber ? 'selected' : 'default');
          	addButton(pager, style, '/path/to/page/' + i, i);
        }
      
      	addButton(pager, 'link', '/path/to/page/' + pagesCount, 'Last');
      
      	parent.appendChild(pager);
    }
    
    // Usage example:
    
    var container = document.querySelector('#pager-container');

    addPager(container, 1, 6, 2);
	addPager(container, 3, 6, 2);
	addPager(container, 4, 6, 2);
	addPager(container, 6, 6, 2);

  </script>
</body>
</html>

HTML based example

As radius, we understand the number of items displayed on the left and right sides of the current page button.

Note: using component, replaceĀ /path/to/page/... with correct url.

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
<head>
  <style>

    div.pager {
    	padding: 20px 0;
    }
    
    a.link { 
    	padding: 5px 10px;
      	text-decoration: none;
      	color: #007bff;
    }

    a.button { 
      	padding: 5px 10px;
      	border: 1px solid;
      	border-radius: 3px;
      	text-decoration: none;
    }
    
    a.button + a.button {
    	margin-left: 5px;
    }
    
    a.button.default {
      	border-color: #66b0ff;
    	background-color: white;
      	color: #007bff;
    }
    
    a.button.default:hover {
    	border-color: #007bff;
        background-color: #e0efff;
    }
    
    a.button.selected {
    	border-color: #007bff;
        background-color: #007bff;
      	color: white;
    }

  </style>
</head>
<body>
  <div id="pager-container"></div>
  <script>
    
    function calculateRange(pageNumber, pagesCount, radiusSize) {
        var start = pageNumber - radiusSize;
        if (start < 1) {
            return {
                start: 1,
                stop: Math.min(2 * radiusSize + 1, pagesCount),
            };
        }
        var stop = pageNumber + radiusSize;
        if (stop > pagesCount) {
            return {
                start: Math.max(1, pagesCount - 2 * radiusSize),
                stop: pagesCount,
            };
        }
        return { start, stop };
    }
    
    function renderPager(pageNumber, pagesCount, radiusSize) {
      	var pager = '';
    	var range = calculateRange(pageNumber, pagesCount, radiusSize);
      
      	pager += '<div class="pager">';
      	pager +=	'<a class="link" href="/path/to/page/1">First</a>';
      
      	for (var i = range.start; i <= range.stop; ++i) {
          	var style = 'button ' + (i === pageNumber ? 'selected' : 'default');
          	var path = '/path/to/page/' + i;
        	pager += '<a class="' + style + '" href="' + path + '">' +
                        i +
                     '</a>'
        }
      
      	pager += '<a class="link" href="/path/to/page/' + pagesCount + '">Last</a>';
      	pager += '</div>';
      
      	return pager;
    }
    
    // Usage example:
    
    var container = document.querySelector('#pager-container');

    container.innerHTML += renderPager(1, 6, 2);
	container.innerHTML += renderPager(3, 6, 2);
	container.innerHTML += renderPager(4, 6, 2);
	container.innerHTML += renderPager(6, 6, 2);

  </script>
</body>
</html>

See also

  1. React - simple pagination / pager componentĀ 
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