Include jQuery, if not included already

Question

I want to include the jquery in file, if not included already in the page.
How can I do this?

I wrote this, but it's giving undesired output.

<script type="text/javascript">

if ('undefined' == typeof window.jQuery) {

    // jQuery not present

//  alert("Jquery Unavailable");

<?php echo '<script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.7.1.min.js"></script>'; ?>

} else {

    // jQuery present

    alert("Jquery Available");

}

</script>

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Answer 1

you cant do that in PHP. Try this instead

<script type="text/javascript">

if(typeof jQuery == 'undefined'){
        document.write('<script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.7.1.min.js"></'+'script>');
  }

</script>

Include jQuery, if not included already

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