DOM Enlightenment Book

HTML

<script src="https://getfirebug.com/firebug-lite-debug.js"></script>
<a href='#' title="title" data-foo="dataFoo" style="margin:0;" class="yes" foo></a>







































<h4 style="border-top:1px solid #ADADAD;padding-top:20px;margin-top:20px;"><strong>&larr; Code Example from <a href="http://www.domenlightenment.com/" target="_blank">DOM Enlightenment Book</a> by <a href="http://www.codylindley.com" target="_blank">Cody Lindley</a></strong></h4>

<p>JavaScript code is executed on page load. Click the "Run" button in the top bar to re-run the JavaScript code. All <code>console.log()'s</code> are logged to the <a href="http://getfirebug.com/firebuglite" target="_blank">Firebug Lite</a> console below &darr;.</p>

JavaScript

var atts = document.querySelector('a');
console.log(atts.constructor);
console.log(
    atts.hasAttribute('href'),
    atts.hasAttribute('title'),
    atts.hasAttribute('style'),
    atts.hasAttribute('data-foo'),
    atts.hasAttribute('class'),
    atts.hasAttribute('foo') //Notice this is true regardless if a value is defined 
)