How to Improve jQuery Performance

How to Improve jQuery Performance

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Guide: How to Improve jQuery Performance

jQuery is one of the most popular JavaScript libraries today. The API is very easy to use which leads to a not so steep learning curve. Many projects use jQuery code instead of directly using the vanilla JavaScript to bring in dynamic functionality.

But jQuery also has its shortcomings. If used improperly, it can lead to performance problems just like the language on which it is based. This post lists some of the best practices for using jQuery that can help us avoid performance issues.

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1. Lazy load scripts if needed

Browsers run JavaScript before creating the DOM tree and painting the pixels on the screen, because scripts can add new elements to the page or change the layout or style of some DOM nodes. So on causing the browser to have fewer scripts to run while the page is loading, we can shortens the time it takes for the final DOMboom create and paint, after which the user will be see the page

One way to do this in jQuery is to use $ .getScript to load a script file the moment it is needed instead of when the page loads.

$ .getScript (“scripts / gallery.js”, callback);

It’s an ajax function that will get a single script file when you want it, but keep in mind that the fetched file will not be cached. To enable caching for getScript, you have to enable the same for all ajax requests. You can do this by using the code below:

$ .ajaxSetup ({cache: true});

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2. Avoid $ (window) .load () if your script does not require sub-resources of the page

The $ (document) .ready () is equivalent to DOMContentLoaded (where DOMContentLoaded is available) and $ (window) .load () to load. The former is triggered when a page’s own DOM is loaded, but not external assets such as images and style sheets. The second is activated when everything has been made from a page up from, including its own content and its sub-sources.

So if you’re writing a script that depends on a page’s sub-resources, like changing the background color of a div formatted by an external stylesheet, it’s best to use $ (window) .load ().

But if not, better to stick with $ (document) .ready () because jQuery will call its ready event handler regardless of whether you use $ (document) .ready () or not, so use it when you can.

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3. Use detach to remove elements from DOM that needed to be changed.

‘Reflow’ is a term that refers to layout changes in a web page, it is when the browser rearranges the elements of a page to accommodate a new element, adapts to structural changes of an element, fills the gap left by a deleted element or some other action that requires a formatting change on the page. reflow is an expensive browser process

We can reduce the number. of reflows caused by structural changes to an element by performing the changes on it after get it out of the page stream and restore it when it is doneIf you add multiple rows to a table one by one, it will cause a lot of reflows. So it is better to get the table from the DOMboom, add the rows and put them back in the DOMThis will reduce reflows.

jQuery’s detach () let us remove an element from the page, it differs from remove () because it stores the data associated with the element for when it should be added to the page later. A disconnected element can then be placed back on the page after modification.

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4. Use css () to set height or width instead of height () and width ()

If you are setting the height or width of an element in jQuery I recommend using the css () function as setting those values ​​with height () and width () will cause additional reflows due to access to some layout type properties in the computeStyleTests function in jQuery (tested in the latest version).

For the code p.height (“300px”); here are the reflows.

reflow at height

For p.css ({“height”: “300px”});

reflow by css

computeStyleTests is used to run some support tests. It is also called when getting the height and width using both css () and height () / width (), but for setting it is only called for height () / width () which may not be needed, so use css () instead.

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5. Do not use the layout properties unnecessarily

Opening layout properties such as height, width, margin, etc. Will trigger page reflow. The reason is that when you ask the browser for one of the layout properties, it ensures that you get the updated value (in case the value was previously invalidated) by recalculate the values ​​and apply any layout changes

So whether you are using jQuery or vanilla JavaScript, beware of unnecessary access to layout properties especially in a loop or so after making style changes.

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6. Use caching whenever possible

Some functions of jQuery come with caching mechanisms that are good to use. Ajax requests cache the resources, but it’s not available for script and jsonp, so if you want to cache all your ajax requests, you might want to set it globally as below.

Also note that if you fetch resources using post, they won’t be cached even if you enable caching with the above settings.

As I said before, detach () cache the data associated with the element to be deleted, unlike remove (); hide () stores the initial CSS display value of an element before hiding it so that it can be restored later without losing the data.

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One way you can be sure that you are using the most effective jQuery code for your need is to wait until you actually run your code and notice whether there is a performance issue or not. If so, use the performance and debugging tools to detect the cause of the problem

Because jQuery is a kind of cocoon for JavaScript with extra functionality for browser compatibility and features, it can be difficult to diagnose the problems without these tools.

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How to Improve jQuery Performance: benefits

  • The How to Improve jQuery Performance tutorial is free .
  • This guide already helps so many users follow up with interest in a timely manner.
  • The price of the How to Improve jQuery Performance guide is free.

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Tutorial summary of How to Improve jQuery Performance

In this guide, we told you about the How to Improve jQuery Performance; please read all steps so that you understand How to Improve jQuery Performance in case if you need any assistance from us, then contact us.

How this tutorial helping you?

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What is actual time in which this method complete?

The time to complete the How to Improve jQuery Performance tutorial is 10+ minutes.

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