WithoutBook LIVE Mock Interviews

Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before interview

Experienced / Expert level questions & answers

Ques 1. Explain the concept of computed observables.

Computed observables in Knockout JS are functions that automatically update whenever the underlying observables they depend on change.

Example:

var firstName = ko.observable('John'); var lastName = ko.observable('Doe'); var fullName = ko.computed(function() { return firstName() + ' ' + lastName(); });

Save For Revision

Bookmark this item, mark it difficult, or place it in a revision set.

Open My Learning Library

Is it helpful? Ja Nein Add Comment View Comments

Ques 2. Explain the concept of custom bindings in Knockout JS.

Custom bindings in Knockout JS allow you to create reusable, encapsulated behaviors for handling specific aspects of the UI.

Example:

ko.bindingHandlers.fadeVisible = { init: function(element, valueAccessor) { var value = valueAccessor(); $(element).toggle(ko.unwrap(value)); }, update: function(element, valueAccessor) { var value = valueAccessor(); ko.unwrap(value) ? $(element).fadeIn() : $(element).fadeOut(); } };

Save For Revision

Bookmark this item, mark it difficult, or place it in a revision set.

Open My Learning Library

Is it helpful? Ja Nein Add Comment View Comments

Ques 3. 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); }

Save For Revision

Bookmark this item, mark it difficult, or place it in a revision set.

Open My Learning Library

Is it helpful? Ja Nein Add Comment View Comments

Ques 4. Explain the 'templateOptions' property in Knockout JS.

The 'templateOptions' property allows you to pass additional options to a template specified in the 'template' binding.

Example:


;  Details; var viewModel = { person: { name: 'John' } };

Save For Revision

Bookmark this item, mark it difficult, or place it in a revision set.

Open My Learning Library

Is it helpful? Ja Nein Add Comment View Comments

Baue deine Fahigkeiten mit fokussierten Lernpfaden, Probetests und interviewreifem Inhalt aus.

Interview Questions and Answers

Experienced / Expert level questions & answers

Ques 1. Explain the concept of computed observables.

Save For Revision

Ques 2. Explain the concept of custom bindings in Knockout JS.

Save For Revision

Ques 3. What is the purpose of the 'afterRender' callback in Knockout JS?

Save For Revision

Ques 4. Explain the 'templateOptions' property in Knockout JS.

Save For Revision

Related interview subjects

All interview subjects

WithoutBook