Why is addClass not recognised as a function in this case?

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I'm trying to add a class to a bunch of links whose suffix ends in .pdf as follows:

var pdfs = jQuery("a[href$='.pdf']"); //Choosing .pdf links
pdfs.each(addClass("pdf")); // Adding the class

This doesn't work, however, as the browser console prints this error when I try to reload the HTML file calling the .js file:

ReferenceError: addClass is not defined

Why is this happening?

jQuery allows you to perform it's API methods not only on single elements, but also on collections of elements (which is one of the nice advantages over the native DOM API).

The easiest way to achieve your goal is to capitalize on that:

var pdfs = jQuery("a[href$='.pdf']"); //Choosing .pdf links
pdfs.addClass("pdf"); // Adding the class

jQuery $.each() function is for those cases where you want to do something with each element in the collection that is not available as an API method in jQuery. It expects you pass it a function that gets passed the current element in each iteration as this:

var pdfs = jQuery("a[href$='.pdf']"); //Choosing .pdf links
pdfs.each(function() { console.log(this.href); }) // perform something jQuery doesn't offer as an API method

If you insist on using $.each(), the code is this:

var pdfs = jQuery("a[href$='.pdf']"); //Choosing .pdf links
pdfs.each(function() { $(this).addClass("pdf"); }); // Adding the class

[Solved] Why jquery method addClass() is not working?, The class 'red' is added to the div when the mouse leaves. However because you are adding in-line CSS styling during the mouseenter  It should be pdfs.addClass("pdf") Why is this happening? because You have not defined the function addClass() – Satpal Sep 12 '18 at 10:56 2 It's because you're calling addClass() as if it were an externally defined function, not as though it's part of a jQuery object.

https://api.jquery.com/addClass/

After choosing the pdf links you can directly call the addClass method on the variable pdfs because this is a jquery object and the class will be applied to all the links.

var pdfs = jQuery("a[href$='.pdf']"); //Choosing .pdf links
pdfs.addClass("pdf"); // Adding the class

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So... in whole:

$("a[href$='.pdf']").each(function () {
   $(this).addClass("pdf");
})

.addClass(), Within the function, this refers to the current element in the set. It's important to note that this method does not replace a class. It simply adds the class, appending it  Unfortunately, you did not specify the DevExtreme version you are using. Nevertheless, I assume that it is v17.2 due to the "addClass" issue. If so, it looks like you have faced the following Breaking Change: BC4148 - The jQuery integration module should now be imported manually when using the modular approach

.each needs a function (delegate) for calling it for per item of jQuery result, but func() (in this case: addClass(..)) will call addClass function (that is not defined in current scope) and pass result of calling it to each function.

you can access to addClass function of per item, like this:

pdfs.each(function(index, pdf){
   $(pdf).addClass(...);
});

or for all:

pdfs.addClass(...);

addClass and removeClass in a switch case, By using our site, you acknowledge that you have read and understand our Also your default case is calling removeClass on a string as selection is the '#​Andres' } var showImage = function() { var selection = $(this).val(); if (selection You lose the default case, but I'm not sure that you really needed it. When you press a function key on a Microsoft keyboard, the function key does not work as expected. Alternatively, certain keys do not work when you press them. These keys may include the following: The NUM LOCK key; The INSERT key; The PRINT SCREEN key; The SCROLL LOCK key; The BREAK key; The F1 key through the F12 FUNCTION keys

addClass(className) is a method of DOM element object. Must be called with element object. when we call addClass() without DOM object reference it look for local function, and thus throw the reference error.

var pdfs = jQuery("a[href$='.pdf']"); 
pdfs.each(function() {
  $(this).addClass( "foo" );
});

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Error: $(".drupal-tabs:not(.tabs-processed)", context).addClass is not , $(".drupal-tabs:not(.tabs-processed)", context).addClass is not a function addClass('tabs-processed'). It seems js does not recognise jQuery but  Click OK and then restart your computer. Try to reconnect the USB device and see if it is recognized. If not, go back to the power management tab for each one and check the box again. If it does recognize the device, then leave them unchecked. Method 5 – Connect Directly to PC

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Comments
  • It should be pdfs.addClass("pdf") Why is this happening? because You have not defined the function addClass()
  • It's because you're calling addClass() as if it were an externally defined function, not as though it's part of a jQuery object. Note that you don't even need the each() here, just $("a[href$='.pdf']").addClass('pdf'); will work.
  • Please take the time to describe what the issues are and why this solution helps. Remember, we're here to educate people, not just dump code on them.
  • It's also available for jQuery collection objects, which makes jQuery so convenient. pdfs.addClass("pdf"); does the job.
  • Yes, @connexo. But I explained about native addClass() method