Online Knockout Test to Assess and Hire KnockoutJS Developer

Candidates Assessed

11274+

Organizations Served

112+

About Knockout Online Skills Assessment Test

Knockout Test helps Hiring Managers & Recruiting Teams to validate the KnockoutJS coding skills of Knockout JS Developer. Knockout.JS is a language which is written under Javascript and helps to develop a rich and responsive website. Knockout JS is independent of any other framework and provides an easy way to handle complex data-driven interfaces. It gives easy templates to create high-level UI structures and also gives easy custom. Knockout.JS online test is specially designed to check application, practical skills of a KnockoutJS developer – as per Industry Standards.

Knockout JS skills test is designed by our subject matter experts to evaluate knowledge of Knockout JS developer before hiring. Using powerful reporting, you can have a detailed analysis of the test results to help you make a better hiring decision and predict the candidate’s performance.

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Test Duration: 20 minutes

No. of Questions: 10

Level of Expertise: Entry/Mid/Expert

Data Binding Syntax

iMocha’s online Knockout JS test helps employers to assess candidate’s ability to use data binding syntax which allows to link data to the UI

Creating a View Model

This test evaluates candidate’s ability to create view model which represents data and operations on a user interface

ViewModels with Parameters

This Knockout JS test assesses candidate’s knowledge about ViewModel that contains the data to bind to the view with specified parameters

Event Data Bindings

Our test evaluates candidate’s knowledge about event binding which allows to add event handler for an event in JavaScript

Extending Observables

This test helps to assess candidate’s understanding about extending observable which supports reading/writing of values and record of changed values

Binding Knockout Template

Our Knockout Js online test evaluates candidate’s ability to bind HTML templates to render it

Showing and Hiding Elements

This test assesses candidate’s understanding about visible binding that shows or hides elements when required

Sample Questions

Choose from our 100,000+ question library or add your own questions to make powerful custom tests

Question types:

Multiple Answer

Topic:

Difficulty:

Easy

Q 1. You need to provide binding true / false to radio buttons in Knockout JS. Which of the following codes will work?
Male

Female

Note: There can be multiple correct answers to this question.

<label>Male
<input type="radio" name="IsMale" value="1" data-bind="checked:IsMale"/>
</label>
<label>Female
<input type="radio" name="IsMale" value="0" data-bind="checked:IsMale"/>
</label>
<div data-bind="text: !!+IsMale()"/>
var vm = {
IsMale: ko.observable(false)
};
ko.applyBindings(vm);

<label>Male
<input type="radio" name="IsMale" value="true" data-bind="checked:IsMale"/>
</label>
<label>Female
<input type="radio" name="IsMale" value="false" data-bind="checked:IsMale"/>
</label>

<label>Male
<input type="radio" name="IsMale" value="true" data-bind="checked:IsMale()"/>
</label>
<label>Female
<input type="radio" name="IsMale" value="false" data-bind="checked:IsMale()"/>
</label>

Question types:

Multiple Answer

Topic:

Difficulty:

Easy

Q 2. Person {
int Id;
string Name;
Book[] Books;
}
Book {
int Id;
string Name;
}
function viewModel() {
var self = this;
self.persons = ko.observableArray();
// persons are retrieved via AJAX...
ko.mapping.fromJS(persons, {}, self.persons);
}
jQuery(function( $ ) {
ko.applyBindings(new viewModel());
});

How can you extend persons observableArray to set validation rules and message?

Note: There can be multiple correct answers to this question.

Use the mapping options to attach the validation rules when certain properties are created.
<input data-bind="value: name" />
var data = { name: "Joe Shmo" };
var validationMapping = {
// customize the creation of the name property so that it provides validation
name: {
create: function(options) {
return ko.observable(options.data).extend( {required: true} );
}
}
};
var viewModel = ko.validatedObservable(ko.mapping.fromJS(data, validationMapping)); ko.applyBindings(viewModel);

Use HTML5 attributes. This is only supported for some validations (i.e. required, pattern).
<input data-bind="value: name" required />
ko.validation.configure({
parseInputAttributes: true
});
var data = { name: "Joe Shmo" };
var viewModel = ko.validatedObservable(ko.mapping.fromJS(data));
ko.applyBindings(viewModel);

function viewModel() {
var self = this;
self.persons = ko.observableArray();
// persons are retrieved via AJAX...
ko.mapping.fromJS(persons, {}, self.persons);
self.Name.extend({ required: true });
}

Question types:

Multiple Answer

Topic:

Difficulty:

Easy

Q 3. In your app you need to show validation messages for user, which of the following ways is correct for this?

Note: There can be multiple correct answers to this question.

Set ko.validation.configure to use deep grouping because the default value is false.
and implement logic validation in viewmodel. for example
viewmodel.save = function(){
var result = ko.validation.group(viewModel, {deep: true});
if (!viewModel.isValid())
{
alert("Please fix all errors before preceding");
result.showAllMessages(true);
return false;
}}

Set ko.validation.configure to use deep grouping because the default value is false.
and implement logic validation in viewmodel. for example
viewmodel.save = function(){
var result = ko.validation.group(viewModel, {deep: true});
if (result().length > 0)
{
alert("Please fix all errors before preceding");
result.showAllMessages(true);
return false;
}}

Use jquery validate plugin for it.

Implement viewModel.errors.showAllMessages() function to viewModel;

Sample Report

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Knockout Online Skills Assessment Test

11274+

112+

About Knockout Online Skills Assessment Test

Test Summary

Useful for hiring

Topics Covered

Data Binding Syntax

Creating a View Model

ViewModels with Parameters

Event Data Bindings

Extending Observables

Binding Knockout Template

Showing and Hiding Elements

Sample Questions

Sample Report

Hire job-fit candidates using this test now

You can customize this test by

Setting difficulty level of test

Combining multiple skills into one test

Adding your own questions to the test

Requesting a tailor-made test

Related Skills

Trusted By

Vipin Sharma, Mobile Programming

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