Image Captions

Dunstan Orchard Dec 29, 2006

General

This script uses the text from the title attribute of an image as a caption for the image. If your title attribute contains a URL then the caption becomes a link, otherwise it's presented as plain text.

Example 1: Plain text caption, style 1

Example 2: Plain text caption, style 2

Example 3: URL caption

Notes

Created by: Dunstan Orchard
Web Site: http://1976design.com/

Source Code

Paste this source code into the designated areas.

External file

Paste this code into an external JavaScript file named: extractImageTitles.js

function extractImageTitles() 	{
 	images = document.getElementsByTagName('img');
	 for (var i = 0; i < images.length; i++) {
		  var title = images[i].getAttribute('title');
		  if ((title) && (title != '')) {
			   if (title.match('http://', 'i')) {
    				newlink = document.createElement('a');
    				newlink.setAttribute('href', title);
    				newlink.setAttribute('title', ('Go to ' + title));
    				newlink.appendChild(document.createTextNode('Image source'));
    				var newdiv = document.createElement('div');
    				newdiv.className = 'caption';
    				newdiv.appendChild(newlink);
    				images[i].parentNode.appendChild(newdiv);
    				images[i].removeAttribute('title');
				  } else {
    				var newdiv = document.createElement('div');
    				newdiv.className = 'caption';
    				newdiv.appendChild(document.createTextNode(title));
    				images[i].parentNode.appendChild(newdiv);
    				images[i].removeAttribute('title');
  				}
		 	}
 	}
}

// Created by: Simon Willison
// http://simon.incutio.com/archive/2004/05/26/addLoadEvent
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

// addLoadEvent(nameOfSomeFunctionToRunOnPageLoad);
addLoadEvent(function(e) {
  extractImageTitles();
});

CSS

Paste this code into your external CSS file or in the <style> section within the HEAD section of your HTML document.

div.image1, div.image3 {
 	margin: 1.5em 0 20px 0;
	 width: 215px;
	 text-align: center;
}

div.image2 {
 	border: 1px solid #888;
	 padding: 5px;
	 margin: 1.5em 0 20px 0;
	 width: 235px;
	 text-align: center;
}

div.image1 img, div.image3 img {
 	border: 1px solid #888;
	 padding: 5px;
}

div.image2 img {
 	border: 1px solid #888;
	 padding: 0;
}

div.caption {
 	color: #555;
	 font: normal 90% "Trebuchet MS", Verdana, Arial, sans-serif;
 	margin: 0;
	 text-align: center;

Head

Paste this code into the HEAD section of your HTML document.


<script type="text/javascript" src="extractImageTitles.js"></script>

Body

Paste this code into the BODY section of your HTML document


<h3>Example 1: Plain text caption, style 1</h3>
<div class="image1"><img src="ff.jpg" width="102" height="99" alt="You really need to get Firefox" title="You really need to get Firefox"></div>

<h3>Example 2: Plain text caption, style 2</h3>
<div class="image2"><img src="ff.jpg" width="102" height="99" alt="You really need to get Firefox" title="You really need to get Firefox"></div>

<h3>Example 3: URL caption</h3>
<div class="image3"><img src="ff.jpg" width="102" height="99" alt="You really need to get Firefox" title="http://www.mozilla.com/en-US/firefox/"></div>

Leave a Response

(2 comments)

Nice script to have in our work. Being a web developer its very useful for me.[br /]One suggestion is that, can make the image enlargeable when clicked. If added with the script it will be more useful and fine.[br /][br /]Thanks for giving me a opportunity to write to your site.

Yuvaraj Aug 23, 2007

Incredible!

Watch TV Online Jan 2, 2007

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