Change sass variables with javascript

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Change sass variables with javascript

Recently I was working on building a new website and found that I wanted to be able to access my Sass variables directly from within my JavaScript. With this in mind I thought, someone else must have had this idea so I did a quick search on NPM to see if there was anything that did this but turned up nothing a rare occurrence as NPM has practically everything you can imagine.

I therefore decided to stop procrastinating with searches and to build something myself, the result was 2 tools. With these tools, as a developer you have the option to simply use the command line tool to generate your Sass variables from a JSON file or you can automate this as part of your Gulp build pipeline by using the Gulp plugin.

change sass variables with javascript

For the following tutorial I am going to use the command line tool. You should now be able to see Sass file, opening it in your text editor will result in the following:. So this has been a brief introduction to sharing variables between your Sass and JavaScript. If you want to automate this compilation process simply use the gulp json-to-scss plugin instead, full documentation is available on NPM.

I work as an Engineering Manager at Beamly where we are currently looking for both Frontend and Full Stack software engineers based in our London office. Are you looking for your next role? Find out more.Learn Development at Frontend Masters.

Frontend Masters has an in-depth course on Advanced CSS Layouts that digs into the big stuff like grid and flexbox, and then more like custom properties and calcusing them for advanced layouts and practical solutions.

Is it more powerful than setting directly the top and left style of an element?

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I see at least two advantages. One is the CSS readability: If you want to pin an element to the position of your cursor, left: var --mouse-x just makes total sense to me. Mixed with a few other CSS techniques this pretty much opens up for a whole lot of new opportunities. Yeas, I already use these powers evry day actually! So great… until your client asks for IE compatibility. My question was more about performance : is it more performant to set a CSS variable than setting the top and left styles directly?

Wanna learn modern CSS layout? Permalink to comment September 16, Matt Wood. Permalink to comment September 18, Permalink to comment September 24, Permalink to comment September 25, Anders Grimsrud. Permalink to comment October 1, This comment thread is closed. If you have important information to share, please contact us.With the rise of large single page applications, Javascript and CSS have become increasingly intertwined.

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However, maintaining two copies of the same value inevitably leads to updating only one and ending up with a frustrating bug. Luckily, with webpack and CSS modulesthere is a better way. Next, we need to configure webpack to use sass-loader so we can access our Sass code from Javascript. Now for the interesting part.

How to Get and Set CSS Variable Values with JavaScript

We define the actual variable value in Sass and export it to Javascript. CSS Modules have a neat utility called :export. Your Sass code will export an object containing the variable name to use in Javascript and its associated value. These values are all exported as strings.

Now, in Javascript, we just need to import the styles from the stylesheet, and parse an int out of the variable we exported! This method is incredibly easy, but it will pay off in spades when you avoid the headache of syncing changes between Javascript and Sass. AWS monitoring. Kubernetes monitoring. Serverless monitoring. Azure monitoring.

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Pricing How it works Customers. About us Careers Contact. All Rights Reserved. Sharing variables between environments is the holy grail of programming. The first step is to install our dependencies: npm install sass-loader node-sass webpack --save-dev Next, we need to configure webpack to use sass-loader so we can access our Sass code from Javascript.

What to Read Next. Subscribe to get blog updates in your inbox. Get started with alert automation See how it'll save you time and toil.CSS variables are a very welcome addition to the language, despite them being incredibly basic. Sure we could use SASS or stylus but languages should never count on developers relying on frameworks and toolkits to accomplish what we know we need. And just like every other part of a webpage, you can get and manipulate CSS variable values -- let's check out how!

I had anticipated the need for disgusting hacks to accomplish CSS variable manipulation with JavaScript so I'm happy it's as easy as described above! Back in late it was not easy to find open source projects using requestAnimationFrame - this is the hook that allows Javascript code to synchronize with a web browser's native paint loop.

Animations using this method can run at 60 fps and deliver fantastic As much as developers now loathe Flash, we're still playing a bit of catch up to natively duplicate the animation capabilities that Adobe's old technology provided us. Another technology available One thing I love doing is duplicating OS functionalities. One of the things your OS allows you to do easily is move from one item to another.

Most of the time you're simply trying to get to the next or the previous item. Oh the frameworks backfire sometimes! Clearly, a group of people were working with insufficient consumption of caffeinated liquids as this is not intuitive. The set and the gets always seem to correspond with each other. By David Walsh July 15, By David Walsh January 26, Discussion Ben C.

This is great! You use document. But contrary to intuition, you use: getComputedStyle document. Then again; in about six months I will have forgotten that I posted comment.Dart Sass is distributed as the pure-Javascript sass packageand LibSass is distributed as a native extension in the node-sass package.

This function synchronously compiles a Sass file to CSS. When using Dart Sass, renderSync is almost twice as fast as render by default, due to the overhead of making the entire evaluation process asynchronous. The compiled CSSas a Buffer. An array of the absolute paths of all Sass files loaded during compilation.

The number of milliseconds it took to compile the Sass file. A string representation of the error. The stylesheet where the error occurred. The column of error. Node Sass and older versions of Dart Sass support loading files with the extension. This string option is the path to the file for Sass to load and compile. This string option provides the contents of the stylesheet to compile. By default, this stylesheet is parsed as SCSS. This flag controls whether the data option is parsed as the indented syntax or not.

It defaults to false.

How to use your Sass variables inside your JavaScript

This string option controls the output style of the resulting CSS. Despite the name, Sass does not write the CSS output to this file. Versions of Node Sass before 3. Versions of Node Sass before 2. Versions of Dart Sass before 1. All versions of Node Sass currently pass imports to importers before loading them relative to the file in which the import appears.

This behavior is considered incorrect and should not be relied on because it violates the principle of localitywhich says that it should be possible to reason about a stylesheet without knowing everything about how the entire system is set up. If a user tries to import a stylesheet relative to another stylesheet, that import should always work. All value types support methods that modify the value objects. Returns the units of the number as a string.

Sets the units of the number, independent of its numeric value. Returns the contents of the string. Sets the red channel of the color. Sets the green channel of the color. Sets the blue channel of the color. Sets the alpha channel of the color.

Creates a new Sass list with the given number of elements. The initial values of the list elements are undefined.

change sass variables with javascript

This map type is represented as a list of key-value pairs rather than a mapping from keys to values. The initial keys and values of the map are undefined.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I have a Sass file which is generating a CSS file. I have used many variables in my sass file for background color, font-size, now I want to control my all variables through JavaScript. You can't. With JS you can set a class to body, ex. Now, if your body will have the default class, the color inside someClass will be red, and if body will have the blue class the color will be blue.

I find sass-extract-loader especially helpful for using with Create-React-App. JavaScript runs client-side in the web browserwhile Sass is generated server-side, so you have to find some way to bridge that gap. One way to do this would be to set up some AJAX-style listening to send JavaScript events over to your server, and then have the server edit and re-compile your style. Learn more. How to control Sass Variable with javascript Ask Question. Asked 6 years, 8 months ago.

Active 1 month ago. Viewed 24k times. For example, in style. JA9 JA9 1, 2 2 gold badges 9 9 silver badges 16 16 bronze badges. Active Oldest Votes.

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Thanks GJK. You're going to have to do it server-side via Node. I also needed this functionality, here's what worked for me: With JS you can set a class to body, ex. Ziarno Ziarno 5, 4 4 gold badges 25 25 silver badges 33 33 bronze badges. Skandix 1, 5 5 gold badges 17 17 silver badges 24 24 bronze badges. Krull Krull 69 1 1 silver badge 3 3 bronze badges.

I don't think so. If you're looking to do what bootstrap do ie editing fields to download a theme. You'd have to: Have the files on hand that you want to edit Store these variables as a string, and use. I'd personally do this with php. Shannon Hochkins Shannon Hochkins 8, 11 11 gold badges 45 45 silver badges 78 78 bronze badges. Chase Oliphant Chase Oliphant 4 4 bronze badges.

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Tudor Morar Tudor Morar 2, 15 15 silver badges 16 16 bronze badges. Sam Borick 2 2 gold badges 10 10 silver badges 23 23 bronze badges. KatieK KatieK In this example, xyand zare variables:. In this example, price1price2and totalare variables:. All JavaScript variables must be identified with unique names. The value of x is incremented by 5. After the declaration, the variable has no value technically it has the value of undefined.

In the example below, we create a variable called carName and assign the value "Volvo" to it. Start the statement with var and separate the variables by comma :. In computer programs, variables are often declared without a value. The value can be something that has to be calculated, or something that will be provided later, like user input. A variable declared without a value will have the value undefined.

The variable carName will have the value undefined after the execution of this statement:. The variable carName will still have the value "Volvo" after the execution of these statements:.

If you put a number in quotes, the rest of the numbers will be treated as strings, and concatenated. Using the dollar sign is not very common in JavaScript, but among professional programmers often use it as an alias for the main function a JavaScript library. Using the underscore is not very common in JavaScript, but a convention among professional programmers is to use it as an alias for "private hidden " variables.

change sass variables with javascript

Create a variable called carName and assign the value Volvo to it. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:. It's a good programming practice to declare all variables at the beginning of a script.

Exercise: Create a variable called carName and assign the value Volvo to it. HOW TO. Your message has been sent to W3Schools. W3Schools is optimized for learning, testing, and training. Examples might be simplified to improve reading and basic understanding.

Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. While using this site, you agree to have read and accepted our terms of usecookie and privacy policy. Copyright by Refsnes Data.


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