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knockout-decorators
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Decorators for use Knockout JS in TypeScript and ESNext environments
Decorators for use Knockout JS in TypeScript and ESNext environments
import { observable, computed, component } from "knockout-decorators";
@component("person-view", `
<div>Name: <span data-bind="text: fullName"></span></div>
<div>Age: <span data-bind="text: age"></span></div>
`)
class PersonView {
@observable firstName: string;
@observable lastName: string;
@observable age: string;
@computed get fullName() {
return this.firstName + " " + this.lastName;
}
constructor({ firstName, lastName, age }, element, templateNodes) {
this.firstName = firstName;
this.lastName = lastName;
this.age = age;
}
}
Property decorator that creates hidden ko.observable
with ES6 getter and setter for it
class Model {
@observable field = 123;
};
let model = new Model();
ko.computed(() => { console.log(model.field); }); // [console] ➜ 123
model.field = 456; // [console] ➜ 456
Accessor decorator that wraps ES6 getter and setter (if defined) to hidden (maybe writeable) ko.pureComputed
class Person {
@observable firstName = "";
@observable lastName = "";
@computed
get fullName() { return this.firstName + " " + this.lastName; }
set fullName(value) { [this.firstName, this.lastName] = value.trim().split(/\s+/g); }
}
let person = new Person();
ko.pureComputed(() => person.fullName).subscribe(console.log.bind(console));
person.fullName = " John Smith " // [console] ➜ "John Smith"
@component(name: string, options?: Object);
@component(name: string, template: any, options?: Object);
@component(name: string, template: any, styles: any, options?: Object);
Shorthand for registering Knockout component by decorating ViewModel class
argument | description |
---|---|
name | Name of component |
template | Knockout template definition |
styles | Ignored parameter (used for require() styles by webpack etc.) |
options | Another options that passed directly to ko.components.register() |
By default components registered with synchronous
flag.
It can be overwritten by passing { synchronous: false }
as options.
If template is not specified then it will be replaced by HTML comment <!---->
If ViewModel constructor accepts zero or one arguments,
then it will be registered as viewModel:
in config object.
@component("my-component")
class Component {
constructor(params: any) {}
}
// ▼▼▼ results to ▼▼▼
ko.components.register("my-component", {
viewModel: Component,
template: "<!---->",
synchronous: true,
});
If ViewModel constructor accepts two or three arguments,
then createViewModel:
factory is created and
{ element, templateNodes }
are passed as arguments to ViewModel constructor.
@component("my-component",
require("./my-component.html"),
require("./my-component.css"), {
synchronous: false,
additionalData: { foo: "bar" } // consider non-standard field
})
class Component {
constructor(
private params: any,
private element: Node,
private templateNodes: Node[]
) {}
}
// ▼▼▼ results to ▼▼▼
ko.components.register("my-component", {
viewModel: {
createViewModel(params, { element, templateNodes }) {
return new Component(params, element, templateNodes);
}
},
template: require("./my-component.html"),
synchronous: false,
additionalData: { foo: "bar" } // consider non-standard field
});
FAQs
Decorators for use Knockout JS in TypeScript and ESNext environments
The npm package knockout-decorators receives a total of 153 weekly downloads. As such, knockout-decorators popularity was classified as not popular.
We found that knockout-decorators demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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