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I'm building a normal webpage which requires me to load about five CSS files and ten Javascript files.

• When loading them separately in the HTML page, my webpage loads fine.

• Now for production, I concatenated all the Javascript into a single file, in the order needed, and all the CSS into another file. But when I try to run the web page with the concatenated files it throws an error saying:

  Uncaught TypeError: undefined is not a function

On the line where jquery.min.js is being loaded in the concatenated Javascript file.

What can I do to mitigate this? I want to concatenate all files and minify them for production. Please help.

EDIT: I merged the Javascript and CSS in the order they were when they were being loaded individually and were working fine.

I'm building a normal webpage which requires me to load about five CSS files and ten Javascript files.

• When loading them separately in the HTML page, my webpage loads fine.

• Now for production, I concatenated all the Javascript into a single file, in the order needed, and all the CSS into another file. But when I try to run the web page with the concatenated files it throws an error saying:

  Uncaught TypeError: undefined is not a function

On the line where jquery.min.js is being loaded in the concatenated Javascript file.

What can I do to mitigate this? I want to concatenate all files and minify them for production. Please help.

EDIT: I merged the Javascript and CSS in the order they were when they were being loaded individually and were working fine.

• javascript
• jquery
• minify

Share Improve this question Follow edited Mar 4, 2013 at 4:38 Perception 80.6k1919 gold badges188188 silver badges196196 bronze badges asked May 3, 2012 at 10:48 ghostCoderghostCoder 7,65599 gold badges5252 silver badges7474 bronze badges 3

• 5 how can we know what is undefined if you got no code to show? – Joseph Commented May 3, 2012 at 10:51
• the undefined is coming in the jquery-1.6.1.min.js that im loading. maybe jquery is not being loaded properly or something? – ghostCoder Commented May 3, 2012 at 10:53
• 1 I reckon this question isn't clear/narrow enough. This is based on the fact that several of the answers are creeping out of the scope of the OP's question. This page needs some TLC. Either the question needs a clarifying edit, or these divergent answers need to be purged / moved somewhere else. – mickmackusa Commented Nov 10, 2020 at 0:02

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13 Answers 13

Sorted by: Reset to default 180

Assuming this problem still has not be resolved, a lot of individual files don't end their code with a semicolon. Most jQuery scripts end with (jQuery) and you need to have (jQuery);.

As separate files the script will load just fine but as one individual file you need the semicolons.

You might have to re-check the order in which you are merging the files, it should be something like:

1. jquery.min.js
2. jquery-ui.js
3. any third party plugins you loading
4. your custom JS

This solution worked for me

    ;(function($){
        // your code
    })(jQuery);

Move your code inside the closure and use $ instead of jQuery

I found the above solution in https://magento.stackexchange.com/questions/33348/uncaught-typeerror-undefined-is-not-a-function-when-using-a-jquery-plugin-in-ma

after seraching too much

I got the same error from having two references to different versions of jQuery.

In my master page:

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>

And also on the page:

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"> </script>

I had this problem recently with the jQuery Validation plug-in, using Squishit, also getting the js error:

"undefined is not a function"

I fixed it by changing the reference to the unminified jquery.validate.js file, rather than jquery.validate.min.js.

@MvcHtmlString.Create(
    @SquishIt.Framework.Bundle.JavaScript()
        .Add("~/Scripts/Libraries/jquery-1.8.2.min.js")
        .Add("~/Scripts/Libraries/jquery-ui-1.9.1.custom.min.js")
        .Add("~/Scripts/Libraries/jquery.unobtrusive-ajax.min.js")
        .Add("~/Scripts/Libraries/jquery.validate.js")
        .Add("~/Scripts/Libraries/jquery.validate.unobtrusive.js")
         ... more files

I think that the minified version of certain files, when further compressed using Squishit, for example, might in some cases not deal with missing semi-colons and the like, as @Dustin suggests, so you might have to experiment with which files you can doubly compress, and which you just leave to Squishit or whatever you're bundling with.

For those out there who still couldn't fix this, I did so by changing my 'this' to '$(this)' when using jQuery.

E.G:

$('.icon').click(function() {
    this.fadeOut();
});

Fixed:

$('.icon').click(function() {
    $(this).fadeOut();
});

I've run into the very same issue, when mistakenly named variable with the very same name, as function.

So this:

isLive = isLive(data);

failed, generating OP's mentioned error message.

Fix to this was as simple as changing above line to:

isItALive = isLive(data);

I don't know, how much does it helps in this situation, but I decided to put this answer for others looking for a solution for similar problems.

Yes, i also I fixed it changing in the js libraries to the unminified.

For example, in the tag, change:

<script type="text/javascript" src="js/jquery.ui.core.min.js"></script>
<script type="text/javascript" src="js/jquery.ui.widget.min.js"></script>
<script type="text/javascript" src="js/jquery.ui.rcarousel.min.js"></script>

For:

<script type="text/javascript" src="js/jquery.ui.core.js"></script>
<script type="text/javascript" src="js/jquery.ui.widget.js"></script>
<script type="text/javascript" src="js/jquery.ui.rcarousel.js"></script>

Quiting the 'min' as unminified.

Thanks for the idea.

Remember: Javascript functions are CASE SENSITIVE.

I had a case where I'm pretty sure that my code would run smoothly. But still, got an error and I checked the Javascript console of Google Chrome to check what it is.

My error line is

opt.SetAttribute("value",values[a]);

And got the same error message:

Uncaught TypeError: undefined is not a function

Nothing seems wrong with the code above but it was not running. I troubleshoot for almost an hour and then compared it with my other running code. My error is that it was set to SetAttribute, which should be setAttribute.

In case there are any morons out there like me, I had this frustrating problem because I forgot a simple

new

keyword before instantiating a new object.

I just had the same message with the following code (in IcedCoffeeScript):

f = (err,cb) ->
  cb null, true

await f defer err, res
console.log err if err  

This seemed to me like regular ICS code. I unfolded the await-defer construct to regular CoffeeScript:

f (err,res) ->
  console.log err if err

What really happend was that I tried to pass 1 callback function( with 2 parameters ) to function f expecting two parameters, effectively not setting cb inside f, which the compiler correctly reported as undefined is not a function.

The mistake happened because I blindly pasted callback-style boilerplate code. f doesn't need an err parameter passed into it, thus should simply be:

f = (cb) ->
  cb null, true
f (err,res) ->
  console.log err if err

In the general case, I'd recommend to double-check function signatures and invocations for matching arities. The call-stack in the error message should be able to provide helpful hints.

In your special case, I recommend looking for function definitions appearing twice in the merged file, with different signatures, or assignments to global variables holding functions.

Make sure you have commented out any commentaries. Sometimes when copying and pasting you will leave out the "/*!"

Also when you go into the console they will list your errors and you should take it one at a time. If you see "Uncaught SyntaxError: Unexpected token * " That might mean it is reading your js file and it isn't getting past the first line.

/*! * jquery.tools 1.1.2 - The missing UI library for the Web * * [tools.tabs-1.0.4, tools.tooltip-1.1.2, tools.scrollable-1.1.2, tools.overlay-1.1.2, tools.expose-1.0.5] * * Copyright (c) 2009 Tero Piirainen * http://flowplayer.org/tools/ * File generated: Wed Oct 07 09:40:16 GMT 2009 */

I got this when I accidentally passed too many parameters into a jquery function that only expected one callback parameter.

For others troubleshooting: make sure you check all your jquery function calls for extra parameters.

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