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I'm passing the entire HTML contents of an external web page to a javascript variable ("myHTML"). Next, I'm trying to determine whether two different tags with specific attributes exist within the myHTML variable. I'm looking for the existence of a certain <div> tag and <script> tag. I am able to identify the <div> tag:

alert($(myHTML).find('div[id^="myID"]').length)

The above code returns the correct count. However, I am unable to find the <script> tag (even though it does exist on the page / in the myHTML variable):

alert($(myHTML).find('script[src*="example.com"]').length)

The above code always returns zero, even though there is a <script> tag with a src attribute pointing to "...example.com/...".

Can anyone explain why the first line of code works, while the second line fails? Is there any solution to this issue?

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  • What do you get if you just try console.log($(myHTML).find('script').length) ? Commented May 10, 2011 at 17:30

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It was discussed before in here: jquery: Keep <script> tag after .find()

jQuery strips all script tags whenever you create a jQuery object from a string. The solution is to parse the string using regular expressions before you turn it into an object.

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Thanks for the info. If I use a regex to find the desired script tag, is there any way to ensure that I am not matching a script tag that is commented out (unlikely to happen, but possible)?
You can use a pre-processing regex to remove all commented out parts from your HTML before searching for the script.

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