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How To Test If jQuery Is Working Explained In Detail

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How To Test If jQuery Is Working Explained In Detail

jQuery is not only an open-source but free JavaScript library. Plus, its API is a breeze to use. It simplifies functions such as AJAX, event handling, and HTML document transversal and manipulation.

jQuery appears as a single JavaScript file. This single file features all the jQuery interfaces such as DOM, AJAX and events.

The jQuery team released the first version in 2016. It is now the most widely used JavaScript library. At least 73% of the internet currently uses jQuery.

jQuery is available for download on jQuery’s official website.

So, how do you test if it is working?

How To Test If Jquery Is Working

To test if jQuery is loaded and working on your page, follow the steps below.

Go to your browser JavaScript console: On your browser, go to “Options.” In “Options,” go to “Developer tools.” In “Developer tools,” find the JavaScript console.

1. Use the “$().jquery” call:

Enter the “$().jquery” command in the console.

The “$().jquery” command is useful for two reasons. Firstly, it confirms whether jQuery is active on your site’s JavaScript. Secondly, it tells you which version is loaded.

The web consoles of modern browsers already have a built-in dollar sign functionality ($()). As a result, it can be difficult to know which function you’re using. You could be using the built-in dollar sign function or the jQuery selector function.

If jQuery is not loaded, the “$().jquery” call will generate a ‘TypeError.’ The reason is that the built-in dollar sign function will give a ‘null’ result when there is no argument provided. 

To avoid this error, check “type of jQuery”. A “function” response indicates that jQuery is working. An “undefined” response means that jQuery is not loaded.

So, how does jQuery work? Continue reading for more information.

How jQuery Works

jQuery makes JavaScript easier to use on your website. Usually, you will require many lines of JavaScript code to execute routine tasks.

jQuery wraps these lines of code into elements. You can call these elements using a single line of code.

jQuery library supports and simplifies CSS manipulation, HTML event methods, DOM manipulation, AJAX, effects and animations, and utilities.

jQuery also has plugins for these and many more other tasks.

Basic jQuery Concepts

There are basic concepts one should understand before delving into the world of jQuery.Let us consider them.

The “$/jQuery” object

The “$/jQuery” object is a global object that grants access to all jQuery functions.

The “$()jQuery”function

The $()jQuery function selects a group of wrapped elements in the document object model (DOM). Another name for this function is the “wrapper function.”

The “$()jQuery” function parameter is a selector with a CSS style syntax.

Wrapped sets

Wrapped sets are structures in an array-like form containing selected DOM elements. The “$()jQuery” function always returns a wrapped element set.

You can work with the wrapped set as an array or with the individual elements. Use an indexer to access the set individually.

How the “$()jQuery” Function Works

To understand how this function works, you need to see how jQuery defines the “$/jQuery” object.

We mentioned earlier that the $/jQuery object is the doorway to all jQuery functions.

The source code jQuery uses to define the “$/jQuery” object is

“window.jQuery=window. $ = jQuery”

The window object in the code represents an open browser window. When you put “$/jQuery” under this window, it becomes a global object accessible from the open window. 

So, what does the jQuery at the end of the source code represent?

Observe that function is declared at the beginning of the jQuery library:

“var jQuery = (function() {”

Therefore, an anonymous function call determines how jQuery defines and assigns the jQuery function.

You now understand how jQuery works. But what is the history behind jQuery, and why is it so popular? What does the future hold for jQuery?

Continue reading for more information.

History And Evolution Of jQuery

jQuery is currently the most popular JavaScript library in the world. jQuery received wide acceptance from the web development community following its release in 2016.

As a result, developers have created a vast ecosystem of jQuery tools such as plugins and frameworks.

However, jQuery’s popularity is diminishing in recent years.

Let us look at how jQuery has evolved and what the future holds for this popular JavaScript library.

John Resig created the first jQuery version in 2005. However, jQuery launched formally in 2006 during a BarCampNYC event. 

The primary purpose of jQuery was to provide a smooth API to handle web tasks. jQuery was a powerful tool for selecting elements. 

The selection criteria were beyond differences in id and class values. jQuery can select elements based on how they interact with each other. 

jQuery helped to streamline code across several browsers. Before that time, codes needed tweaking to function seamlessly across different browsers.

In no time, jQuery developed to enable browsers to adopt AJAX and animations.

The jQuery team announced the appointment of a jQuery Board in 2011. In 2012, the novel jQuery Board created the jQuery Foundation.

jQuery has been the go-to JavaScript library for more than a decade. However, current trends indicate that jQuery’s popularity is declining.

GitHub has taken jQuery off their website’s front end. Bootstrap will soon follow suit.

What are the current trends happening in the web development world that are responsible for jQuery’s decline?

Read on to know more.

Why The Popularity Of jQuery Is Declining

The following factors have contributed to the decline in jQuery’s popularity.

Browsers Are Developing To Make jQuery Irrelevant:

Variances still exist across different browsers. However, they are now evolving to provide solutions to existing problems.

Browser features can now replicate jQuery functions using native code. Below are some typical examples.

  1. The Fetch API can handle the task of a jQuery AJAX function.
  2. Browsers now have methods that can replicate the selection capability of jQuery.The “query selector” function is an example. 
  3. Browsers can now manipulate elements using “ClassList.”
  4. CSS can now execute animation effects more efficiently than jQuery, making it redundant for this purpose.

Browser updates have become more seamless and frequent:

Browsers updates now occur more frequently than in the past. Sometimes, updates go on seamlessly in the background without any intervention from the users.

As a result, users quickly adopt bug fixes and new functionalities. It also helps developers, as they do not need to load jQuery to use these features.

Internet explorer is becoming defunct:

Internet Explorer was the most popular browser of the 2000s. However, it had limitations. Bugs specific to IE were common. It also lacked regular updates.

Microsoft eventually ended support for 1E10 and lower versions. As a result, web developers found it convenient to ignore addressing compatibility issues with IE. jQuery was the solution to this problem.

jQuery has even dropped support for IE 8 and below. Though some legacy websites still use IE, the browser is fast losing relevance.

New web frameworks have emerged to edge jQuery:

Since jQuery’s release, new web frameworks have entered the fray. The most popular ones are Vue, Angular and React. 

These frameworks have the edge over jQuery in two ways.

First, these new frameworks can render and update a page at the same time. jQuery could only produce updates to a page. It depends on the server to supply the initial page.

These new frameworks make the splitting of UI into several components easier. This ability makes for more efficient building and maintenance of complex websites.

Secondly, with these new frameworks, a developer needs to write only the UI description. The framework will automatically apply it. With jQuery, the developer approach is more imperative. You will need to write both the description and the steps to execute it.

However, jQuery is still a convenient choice for simple websites. jQuery code is less verbose than native code.

The Future Of jQuery

jQuery made web development easier in many respects.

jQuery is still under active development. It will continue to remain popular in the coming years.

Many developers still prefer using jQuery’s API despite the availability of native methods.

Novel frameworks have now emerged with better features, edging jQueryinto a slow and steady decline. 

Unless there is a significant development to its API, jQuery’s popularity will continue to wane. Developers now build new websites using modern frameworks.

Conclusion

jQuery is an open-source JavaScript library you can have access to for free. Its API also supports and simplifies AJAX, event handling, and HTML document transversal and manipulation functions.

To test if jQuery is loaded, and it’s working on your page, consider using the jQuery call “$().jquery” in the JavaScript console of your page developer tools.

If jQuery is not loaded, the “$().jquery” call will yield a ‘TypeError.’ The reason is that the built-in dollar sign function will give a ‘null’ result when there is no argument provided. 

To avoid this error, check “type of jQuery”. A “function” response indicates that jQuery is working. An “undefined” response means that jQuery is not loaded.

jQuery made web development simple. However, novel frameworks have now emerged with better features. 

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