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Editorial Team
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Asked: 2026-05-18T22:51:58+00:00

<html> <head> <script type=text/javascript src=jquery.js></script> </head> <body> <ul> <li><strong>list</strong> item 1 – one strong

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<html>
<head>
<script type="text/javascript" src="jquery.js"></script>
</head>
<body>
<ul>
  <li><strong>list</strong> item 1 -
    one strong tag</li>
  <li><strong>list</strong> item <strong>2</strong> -
    two <span>strong tags</span></li>
  <li>list item 3</li>
  <li>list item 4</li>
  <li>list item 5</li>
  <li>list item 6</li>
</ul>

<script type="text/javascript">
$('li').filter(function(index) {
  return $('strong', this).length == 1;
}).css('background-color','red');
</script>

</body>
</html>

Given the HTML above, what’s the meaning of the comma in the selector below?

return $('strong', this).length == 2;

What will happen if I remove the word ‘strong’?

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1 Answer

  1. Editorial Team

    It sets this as the context from which the query is performed.

    An equivalent (and slightly more efficient) way to write it is:

    return $(this).find('strong').length == 2;

    When I say equivalent, I mean behind the scenes, it is actually flipped around into the version above.

    If you remove the 'strong', you won’t have a valid selector. You’ll be doing:

    return $(this).find('').length == 2;

    Looks like it just returns an empty jQuery object, which means length will be 0, so you won’t get any elements out of the .filter().

    Reference:

    http://api.jquery.com/jQuery/

    jQuery( selector [, context ] )

    context

    Type: Element or jQuery

    A DOM Element, Document, or jQuery to use as context

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