Is there a multiple inclusion guard for javascript/jquery file?

Question

I'm working on my first ASP.NET MVC 3 application with utilizes some JavaScript and jQuery here and there. I ran into a problem with a particular jQuery plugin that ended up being referenced multiple times and this resulted in a stackoverflow/too much recursion error when I tried to use the plugin on the page. Moving this out of my partial view file and into the _Layout.cshtml caused the error to go away, but I'm thinking this isn't really the solution either.

I'm still very new to JavaScript and jQuery and was wondering if there's a guard, like I would use in a C file to avoid multiple includes of a particular header file, to do likewise with a JavaScript file.

Or, if there's a better way to handle this, I'd be interested in hearing how. Perhaps it is an issue just with this particular plugin file. Any guidance on this?

Closing this as it's pretty much a duplicate of another - just missed it during my searching. — itsmatt
– itsmatt, Commented Nov 1, 2011 at 17:45
possible duplicate of How can I know if a javascript file has already been included in a top-level page? — itsmatt
– itsmatt, Commented Nov 1, 2011 at 17:45

Community · Accepted Answer · 2017-05-23 12:03:36Z

3

I used the code below to solve a similar issue.

function requireOnce(url) {    
if (!$("script[src='" + url + "']").length) {
    $('head').append("<script type='text/javascript' src='" + url + "'></script>"); 
}

}

Credit

Option 2

I just found this thread. I've yet to try it but if you are using razor it sounds like it could be perfect. I'll have to try this myself.

edited May 23, 2017 at 12:03

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answered Nov 1, 2011 at 17:42

boolean

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3 Comments

itsmatt Over a year ago

Thanks - missed the original question.

boolean Over a year ago

It's understandable, most of the results that are returned are for the RegisterClientScript which only works in webforms. Also, I had to go through a few other versions of similar scripts before I found one that works, so hopefully it works for you.

Will Over a year ago

NB: Small typo in the 2nd line where it says scr=

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