When to inline javascript?

Asked by: Jeremy Johnson  |  Last update: 29 June 2021
Score: 4.1/5 (11 votes)

When should I use an Inline script and when to use external JavaScript file? To enhance performance, try to keep JavaScript external. The separate code makes it easier for web browsers to cache. However, use inline scripts only when you're making single page websites.

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In respect to this, Is it OK to use inline JavaScript?

Note: Using Inline JavaScript is a bad practice and it is not recommended. It can be used for demonstration purposes so that the demonstrator doesn't have to deal with 2 separate files at a time. ... js file and then link the same using src attribute in the script tag.

One may also ask, Why is inline JavaScript bad?. Inline scripting is bad and should be avoided because it makes the code more difficult to read. Code that is difficult to read is difficult to maintain. If you can't easily read it and understand what's going on, you won't be able to easily spot bugs.

Herein, What is JavaScript inline?

Description. The "Inline JavaScript" filter reduces the number of requests made by a web page by inserting the contents of small external JavaScript resources directly into the HTML document. This can reduce the time it takes to display content to the user, especially in older browsers.

Why is it a bad practice to use inline script tags?

It's not recommended to inline static resources (in your case, the inline javascript) since you can't cache them. Caching a static resource reduces the size of page loads – thus increasing the page load speed – for returning visitors. However it comes at the cost of an additional HTTP request which should be avoided.

37 related questions found

Why is the use of inline CSS often considered bad practice in web design?

Inline styles, while they have a purpose, generally are not the best way to maintain your website. They go against every one of the best practices: Inline styles don't separate content from design: Inline styles are exactly the same as embedded font and other clunky design tags that modern developers rail against.

Are inline scripts cached?

Chrome does try to cache inline scripts, by attaching their cache to the HTML document's resource, but these caches then become dependent on the entire HTML document not changing, and are not shared between pages.

How do I stop an inline script?

One of the best ways that I can think of to avoid using inline JavaScript is to simply not script inline JavaScript. By putting the JavaScript in an externel JS file, you are not writing JavaScript inline on your HTML doc.

How do you apply inline style?

An inline style may be used to apply a unique style for a single element. To use inline styles, add the style attribute to the relevant element. The style attribute can contain any CSS property.

What do you mean by inline functions?

An inline function is one for which the compiler copies the code from the function definition directly into the code of the calling function rather than creating a separate set of instructions in memory. This eliminates call-linkage overhead and can expose significant optimization opportunities.

What is inline CSS?

An inline CSS is used to apply a unique style to a single HTML element. An inline CSS uses the style attribute of an HTML element.

What is inline code in HTML?

Alternatively referred to as in-line, inline is any element contained within a program, document, or message. For example, with HTML, inline code is anything built into the web page, instead of being loaded from an external file.

What is inline script tag?

Inline and External Scripts

The <script> tag allows code to either be embedded directly into HTML, or included from external script files. Inline scripts are created by placing code between <script> and </script> tags in an HTML file. ... The external files are referenced via a URL specified by the “src” attribute.

Why unsafe inline is bad?

Why 'unsafe-inline' in script - src is bad

But when you put in 'unsafe-inline' you are allowing javascript back into the HTML, which makes XSS possible again. ... If an attacker is technical enough to find an XSS on your website, they're technical enough to abuse an 'unsafe-inline' in your policy.

What does unsafe inline do?

When properly configured, modern browsers will block any script or style that is not explicitly whitelisted. The use of 'unsafe-inline' basically allows unknown scripts and styles to be executed and thereby weakens the whole system.

How do I enable inline execution?

Allow Inline Style Attribute using a hash

Either the 'unsafe-inline' keyword, a hash ('sha256-nMxMqdZhkHxz5vAuW/PAoLvECzzsmeAxD/BNwG15HuA='), or a nonce ('nonce-...') is required to enable inline execution.

Is inline JavaScript cached?

The answer to both your questions is no. Unless the whole page is being cached. A browser can't cache part of a file, since it would have to download it to know which parts it had cached and by that time it's downloaded them all anyways.

Should JavaScript be cached?

In general, most modern browsers will cache JavaScript files. This is standard practice for modern browsers and ensures an optimized loading experience. Cached assets such as JavaScript will typically be served from the browser's cache instead of making another request for a resource that has already been retrieved.

How do I force a browser to reload JavaScript?

Clear the cache or force reload in the browser.
  1. Hit CTRL-F5 or CTRL-SHIFT-R in most modern browsers to force reload.
  2. Use the developer's console to clear the cache.