Passing data into components in Knockout

Question

ICSM Computer · Answer

You can create components (kind of like reusable UI modules) and pass data into them using the
params binding — similar to how you'd pass props in frameworks like 
Reactor Vue.
Let’s go step-by-step and learn how to create and use components with data-binding support.and 
What Are Knockout Components?
Reusable templates + ViewModelsEncapsulate functionalityAccept input via params
Basic Example: A hello-user component
Register the Component
ko.components.register('hello-user', {
  viewModel: function(params) {
    this.name = ko.observable(params.name); // passed from parent
  },
  template: `andlt;divandgt;Hello, andlt;strong data-bind="text: name"andgt;andlt;/strongandgt;!andlt;/divandgt;`
});
Use It in HTML
andlt;hello-user params="name: userName"andgt;andlt;/hello-userandgt;
Parent ViewModel
function AppViewModel() {
  this.userName = ko.observable("Alice");
}
ko.applyBindings(new AppViewModel());
Now it’ll show: Hello, Alice!
params — How It Works
You can pass any data into the component:
Primitive valuesObservablesObjectsFunctions
Example:
andlt;my-card params="title: 'Product', price: 99.99, inStock: true"andgt;andlt;/my-cardandgt;
Working with Multiple Params
ko.components.register('my-card', {
  viewModel: function(params) {
    this.title = params.title;
    this.price = params.price;
    this.inStock = params.inStock;
  },
  template: `
    andlt;divandgt;
      andlt;h3 data-bind="text: title"andgt;andlt;/h3andgt;
      andlt;pandgt;Price: $andlt;span data-bind="text: price"andgt;andlt;/spanandgt;andlt;/pandgt;
      andlt;span data-bind="visible: inStock"andgt;In stockandlt;/spanandgt;
      andlt;span data-bind="visible: !inStock()"andgt;Out of stockandlt;/spanandgt;
    andlt;/divandgt;
  `
});
Bonus: Passing Observable vs. Value
If you pass an observable, the component will react to changes.If you pass a plain value, it's fixed at that time.
Example:
andlt;hello-user params="name: userName"andgt;andlt;/hello-userandgt;
If userName is observable and gets updated, the component will automatically reflect the change.
Summary
Feature
Description
ko.components.register
Defines the component
params
Used to pass data from parent to component
template
Inline or external HTML
Reactive props
Use observables for dynamic updates
and

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Passing data into components in Knockout

ICSM Computer

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1 Answers

What Are Knockout Components?

Basic Example: A `hello-user` component

Register the Component

Use It in HTML

Parent ViewModel

`params` — How It Works

Working with Multiple Params

Bonus: Passing Observable vs. Value

Summary

Liked By

Feature	Description
`ko.components.register`	Defines the component
`params`	Used to pass data from parent to component
`template`	Inline or external HTML
Reactive props	Use observables for dynamic updates