Turn a JavaScript object with CSS styles into a class in a stylesheet.
var buttonClass = mx.style({
color: "yellow",
padding: 10,
":hover" { color: "black" }
});
myButton.className = buttonClass;
// .mx__0 { color: yellow; padding: 10px }
// .mx__0:hover { color: black }
When writing an application where the DOM is generated by JavaScript, defining styles where you define your views are often convenient. Rather than applying de-facto inline styles with classes such as text-lowercase and pull-left, you might just as well embrace inline styles.
Using JavaScript to define your styles also gives you the full power of a familiar programming language to inherit, extend and manipulate your styles.
The style attribute has some limitations though, like the inability to add pseudo classes. Manipulating many individual style properties can also have performance implications. marcssist lets you write class-less styles, just as Marx intended, without giving away the power of CSS.
While created with React in mind, any JavaScript code/framework/library that accepts a class name when creating an element should work perfectly fine with marcssist.
marcssist exposes itself as a CommonJS module if in such an environment, and otherwise on window.marcssist. I always alias that to mx for convenience.
Add a style object, returning a class name used to apply the styles. If style is an array, the properties are added left-to-right, with the properties on the last object overriding previous ones.
mx.style([{ height: 1, width: 1 }, { width: 2 }]);
// .mx__1 { height: 1px; width: 2px }
If an object is passed as a value to a key, the key is considered a selector instead of a CSS property. It is simply treated as a new style block, but with the key appended to the returned class name. All selectors not starting with : or [ will automatically be separated by a space. You can nest styles as deep as you like.
mx.style({ background: "red", "a:hover": { "> span b": { color: "blue" }}});
// .mx__2 { background: red }
// .mx__2 a:hover > span b { color: blue }
Similar to the style method, values can also be an array of objects.
var buttonStyle = { textDecoration: "none", border: "1px solid grey" }
mx.style({ a: [ buttonStyle, { color: "blue" }]});
// .mx__3 a { text-decoration: none; border: 1px solid grey; color: blue }
Create a new instance of marcssist with the supplied options. Valid options and their defaults are:
- Vendor prefixing:
prefix = true - Auto units:
unit = "px"
The current vendor prefix is automatically detected, and then added to a number of pre-defined properties and property/value combinations. If you're missing a property, you can add it to the marcssist._prefixed(Props|Values) objects. See source code for format.
mx.style({ columnCount: 2 }});
// .mx__3 { -webkit-column-count: 2 }
Support for prefixed values is currently limited.
If a number is specified, it will be converted to a string with an appended unit. This is convenient for things like { padding: PADDING + 5 }.
What's remaining feature-wise is @at-rules, improved browser compatibility and performance. If you want other features, you should probably use a separate library.
Send a pull request, with usage examples, to add more libraries suitable for marcssist users.
mx.style({ background: tinycolor("hotpink").lighten() });
Copyright (c) 2014 Jacob Rask, <jacob@jacobrask.net>
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