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Knockout JS Interview Questions and Answers

Ques 16. Explain the 'subscribe' method in Knockout JS.

The 'subscribe' method is used to register a callback function that will be called whenever the associated observable's value changes.

Example:

var myObservable = ko.observable('Initial value'); myObservable.subscribe(function(newValue) { console.log('New value:', newValue); });

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Ques 17. What is the purpose of the 'foreach' and 'as' combination in Knockout JS?

The 'foreach' and 'as' combination is used to alias the variable name used to represent each item in an array when using the 'foreach' binding.

Example:

; var items = ko.observableArray(['Item 1', 'Item 2']);

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Ques 18. How does the 'checked' binding work in Knockout JS?

The 'checked' binding is used to bind the checked state of a checkbox or radio input to an observable, enabling two-way data binding.

Example:

; var viewModel = { isChecked: ko.observable(true) };

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Ques 19. Explain the purpose of the 'hasfocus' binding in Knockout JS.

The 'hasfocus' binding is used to bind an observable to the focus state of an element, allowing you to track and control focus programmatically.

Example:

; var viewModel = { isFocused: ko.observable(true) };

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Ques 20. What is the purpose of the 'afterRender' callback in Knockout JS?

The 'afterRender' callback is used with the 'foreach' binding to execute a function after each item in the array is rendered in the UI.

Example:

; var items = ko.observableArray(['Item 1', 'Item 2']); function myCallback(elements) { console.log('Rendered elements:', elements); }

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