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Au-Class custom attribute for simplifying bound CSS declarations
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<template> | |
<h1>${message}</h1> | |
</template> |
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export class App { | |
message = 'Hello World!'; | |
} |
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import {customAttribute} from 'aurelia-framework'; | |
/** | |
* The au-class custom attribute is intended to simplify aurelia binding code in the standard html class attribute. | |
* | |
* This is an unofficial community proposal to add to Aurelia (aurelia.io) | |
* | |
* Before: | |
<div class="base-class ${foo} ${someVMProp < 10 ? 'red' : ''} ${!otherVMProp ? 'blue' : ''}"></div> | |
* After: | |
<div au-class.bind="['base-class', foo, {red: someVMProp < 10, blue: !otherVMProp}]"></div> | |
*/ | |
@customAttribute('au-class') | |
export class AuClass { | |
classes = new Set(); | |
static inject = [Element]; | |
constructor(element: Element) { | |
this.element = element; | |
} | |
valueChanged(newVal = {}) { | |
let newClasses = new Set(AuClass._extractClasses(newVal)); | |
let removedClasses = [...this.classes].filter(x => !newClasses.has(x)); | |
let addedClasses = [...newClasses].filter(x => !this.classes.has(x)); | |
this.removeClasses(removedClasses); | |
this.addClasses(addedClasses); | |
this.classes = newClasses; | |
} | |
addClasses(classes) { | |
classes.forEach(c => this.element.classList.add(c)) | |
} | |
removeClasses(classes) { | |
classes.forEach(c => this.element.classList.remove(c)) | |
} | |
static _extractClasses(args) { | |
let classesFound; | |
if (args && typeof args === 'string') { | |
classesFound = [args]; | |
} | |
if (Array.isArray(args)) { | |
classesFound = args.reduce((acc, arg) => acc.concat(AuClass._extractClasses(arg)), []); | |
} | |
else if (typeof args === 'object') { | |
classesFound = Object.keys(args).filter(p => args[p]); | |
} | |
return classesFound; | |
} | |
} |
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<!doctype html> | |
<html> | |
<head> | |
<title>Aurelia</title> | |
<link rel="stylesheet" href="styles.css"> | |
<meta name="viewport" content="width=device-width, initial-scale=1"> | |
</head> | |
<body aurelia-app="main"> | |
<h1>Loading...</h1> | |
<script src="https://cdn.rawgit.com/jdanyow/aurelia-bundle/v1.0.3/jspm_packages/system.js"></script> | |
<script src="https://cdn.rawgit.com/jdanyow/aurelia-bundle/v1.0.3/config.js"></script> | |
<script> | |
System.import('aurelia-bootstrapper'); | |
</script> | |
</body> | |
</html> |
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export function configure(aurelia) { | |
aurelia.use | |
.standardConfiguration() | |
.developmentLogging(); | |
aurelia.start().then(a => a.setRoot()); | |
} |
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/* styles */ |
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