Understanding Web Services

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Questions and Answers

Which of the following best describes the primary function of a web service?

  • To directly control operating system functions.
  • To manage hardware resources on a local computer.
  • To enable data exchange between different applications or systems over a network. (correct)
  • To provide a graphical user interface for desktop applications.

Web services primarily use binary code for data exchange to ensure high performance.

False (B)

What is the role of HTTP/HTTPS in web services?

Transport protocol

_______ is a directory service that allows developers to locate and use web services.

<p>UDDI</p>
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Match the following terms with their corresponding descriptions:

<p>WSDL = Describes the interface of a web service. SOAP = A protocol that uses XML for data exchange. REST = An architectural style that uses HTTP for data exchange. JSON = A lightweight data interchange format using key-value pairs.</p>
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Which data format is known for its lightweight nature and use of key-value pairs?

<p>JSON (C)</p>
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A service consumer is responsible for creating and publishing web services.

<p>False (B)</p>
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What type of document is WSDL?

<p>XML</p>
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The _______ event is triggered when a user changes the value of an input field.

<p>onChange</p>
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Match each event handler with its corresponding trigger:

<p>onClick = Element is clicked onMouseOver = Mouse hovers over an element onKeyDown = A key is pressed down onSubmit = A form is submitted</p>
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Which event handler is triggered when the user leaves a webpage?

<p>onUnload (A)</p>
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The onMove event only triggers when the mouse cursor is moved.

<p>False (B)</p>
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Which event is specifically designed to handle form submissions?

<p>onSubmit</p>
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The _______ event is triggered when a JavaScript error occurs.

<p>onError</p>
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Match the event to what causes it to trigger:

<p>onBlur = Element loses focus onFocus = Element gains focus onMouseDown = Mouse button is pressed onMouseUp = Mouse button is released</p>
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Which event handler is triggered when an image fails to load?

<p>onError (C)</p>
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The onKeyPress event triggers only when a non-character key (like Shift or Ctrl) is pressed.

<p>False (B)</p>
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What event is triggered when a user cancels the loading of an image?

<p>onAbort</p>
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The _______ event fires when the browser window is resized.

<p>onResize</p>
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Match each event handler with its corresponding mouse action:

<p>onMouseMove = Mouse is moved onMouseOut = Mouse leaves an element onMouseOver = Mouse hovers over an element onDblClick = Element is double-clicked</p>
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Flashcards

Web Service

A set of open protocols that enable data exchange between different applications over the internet using web protocols like HTTP/HTTPS.

XML (in Web Services)

A markup language using tags to describe the structure of data for web services.

JSON (in Web Services)

A lightweight data interchange format that uses key-value pairs for web services.

SOAP (Simple Object Access Protocol)

A protocol that uses XML for data exchange and relies on specific messaging formats in web services.

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REST (Representational State Transfer)

An architectural style that uses HTTP for data exchange and can be accessed through simple HTTP requests in web services.

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WSDL (Web Services Description Language)

An XML-based language used to describe the interface of a web service, including operations, parameters, and data types.

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UDDI (Universal Description, Discovery, and Integration)

A directory service used to publish and discover web services, allowing developers to locate and use services.

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Service Provider

An entity that creates and publishes the web service.

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Service Consumer

An entity that accesses the web service.

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onAbort

An event that is triggered when the loading of an image is canceled.

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onBlur

An event that fires when an element loses focus.

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onChange

An event that happens when a user modifies the value of an input field.

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onClick

An event that executes when an element is clicked.

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onDblClick

An event that fires on a double-click of an element.

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onDragDrop

An event that is triggered when an icon is dragged and dropped.

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onError

An event that runs when a JavaScript error occurs.

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onFocus

An event that fires when an element gains focus.

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onLoad

An event that occurs when a page or image is fully loaded.

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onMouseMove

An event that executes when the mouse is moved.

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onSubmit

An event that executes when a form is submitted.

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Study Notes

  • Web services are a set of open protocols enabling data exchange between applications or systems.
  • Web services use protocols like HTTP/HTTPS to exchange data, often in XML format, over the internet.
  • They process client requests over HTTP, retrieve or modify data, and respond in XML.
  • This enables cross-platform communication.

Components of Web Services

  • XML and JSON are primary data formats for encoding data and messages.
  • XML is a markup language using tags to describe data structure.
  • JSON is a lightweight data interchange format using key-value pairs.
  • SOAP and REST are the main protocols for data exchange.
  • SOAP (Simple Object Access Protocol) uses XML and specific messaging formats.
  • REST (Representational State Transfer) uses HTTP and can be accessed via HTTP requests.
  • WSDL (Web Services Description Language), an XML-based language describes a web service interface.
  • WSDL specifics operations, parameters, and data types.
  • UDDI (Universal Description, Discovery, and Integration) is a directory service for publishing and discovering web services.
  • Allows developers to locate and use web services and service providers to advertise services.
  • Service providers create and publish web services, and service consumers access them.
  • They communicate using specified protocols and data formats

Event Handlers

  • onAbort: Triggered when image loading is canceled.
  • onBlur: Fires when an element loses focus.
  • onChange: Happens when a user changes the value of an input.
  • onClick: Executes when an element is clicked.
  • onDblClick: Fires on double-click of an element.
  • onDragDrop: Triggered when an icon is dragged and dropped.
  • onError: Runs when a JavaScript error occurs.
  • onFocus: Fires when an element gains focus.
  • onKeyDown: Triggered when a key is pressed down.
  • onKeyPress: Fires when a key is pressed or held.
  • onLoad: Occurs when a page or image fully loads.
  • onMouseDown: Fires when a mouse button is pressed.
  • onMouseMove: Executes when the mouse is moved.
  • onMouseOut: Fires when the mouse leaves an element.
  • onMouseOver: Fires when the mouse hovers over an element.
  • onMouseUp: Executes when a mouse button is released.
  • onMove: Fires when the browser window/frame is moved.
  • onReset: Triggered when a form's reset button is clicked.
  • onResize: Happens when the browser window is resized.
  • onSelect: Executes when text is selected in a text field.
  • onSubmit: Triggered when a form is submitted.
  • onUnload: Fires when the user leaves the page.

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