Questions and Answers of Programming World Wide

If you have a variable that has the id of an HTML element, how can you get the DOM address of that element in JavaScript?
If you know the id of an HTML element, how can you get the DOM address of that element in JavaScript?
Define a dynamic HTML document.
What purpose does the navigator object have?
Explain the parameters to the arc method.
What exactly does the moveTo method do?
What is the purpose of the canvas element?
What exactly do the clientX and clientY properties store?
How can an event handler be unregistered?
How is an event handler registered so that it will be called during the capturing phase?
Explain the first two parameters of the addEventListener method.
Give two examples of default actions of events.
Explain the three phases of event processing in the DOM 2 event model.
What event propagation takes place in the DOM 0 event model?
What event is used to trigger an event handler that checks the validity of input for a text button in a form?
What happens when an event handler for the onsubmit event returns false?
What three things should be done when a form input element is found to have incorrectly formatted data?
Why is it good to use JavaScript to check the validity of form inputs before the form data is sent to the server?
What are the advantages of assigning event handlers to event properties?
What is the disadvantage of assigning event handlers to event properties?
Develop and test an HTML document and a JavaScript script to draw the Olympics logo.
Describe the approach to addressing HTML elements using getElementById.
Develop and test an HTML document and a JavaScript script to draw a filled square with an empty circle inside it.
Describe the approach to addressing HTML elements using name attributes.
Revise the document of Exercise 5.3 to use the DOM 2 event model.Data from exercise 5.3Develop and test an HTML document that has checkboxes for apple (59 cents each), orange (49 cents each), and
Describe the approach to addressing HTML elements using forms and elements.
Revise the document of Exercise 5.1 to use the DOM 2 event model.Data from exercise 5.1Modify the radio_click.html example to have five buttons, labeled red, blue, green, yellow, and orange. The
In what ways can an HTML form element acquire focus?
Develop and test an HTML document that collects the following information from the user: last name, first name, middle initial, age (restricted to be greater than 17), and weight (restricted to the
Why should document. write not be used in an event handler?
What are the two ways in which an event handler can be associated with an event generated by a specific HTML element in the DOM 0 event model?
What is the origin of the DOM 0 event model?
What is an event handler?
Develop and test an HTML document that has checkboxes for apple (59 cents each), orange (49 cents each), and banana (39 cents each), along with a Submit button. Each of the checkboxes should have its
How are HTML elements and attributes represented in the JavaScript binding to DOM?
Global variables in JavaScript are properties of what object?
What exactly does the String method match do?
What exactly does the String method replace do?
What does the i pattern modifier do?
Describe the two end-of-line anchors.
What are the symbolic quantifiers, and what do they mean?
What are the predefined character classes, and what do they mean?
What is a character class in a pattern?
In JavaScript, what exactly does a constructor do?
What is one way in which primitive variables can be passed by reference to a function?
How can a function access actual parameter values for those actual parameters that do not correspond to any formal parameter?
Does JavaScript check the types of actual parameters against the types of their corresponding formal parameters?
What parameter-passing method does JavaScript use?
What is the advantage of using local variables in functions?
Is it possible to reference global variables in a JavaScript function?
Define the scope of a variable in a JavaScript script embedded in an HTML document when the variable is not declared in a function.
What value is returned by a function that contains no return statement?
What is the form of a nested array literal?
Describe the semantics of the slice method when it is given just one parameter.
Describe the semantics of the join method of Array.
What is the relationship between the value of the length property of an Array object and the actual number of existing elements in the object?
Describe the two ways an Array object can be created.
Describe the semantics of the for-in statement.
How is a new property of an object created?
Describe the two ways the properties of an object can be referenced.
What are the properties of an object created with a new operator and the Object constructor?
What is the difference between a constructor in Java and one in JavaScript?
When is a JavaScript constructor called?
What is the difference between a while statement and a do-while statement?
What is the semantics of a break statement?
What does short-circuit evaluation of an expression mean?
What are the three possible forms of control expressions in JavaScript?
What is a control construct?
Describe the operation of the prompt method.
What is the usual end-of-line punctuation for the string operand passed to alert?
What is the usual end-of-line punctuation for the string operand passed to document.write?
What value does type of return for an object operand?
Why is parseInt not used more often?
Describe the purpose and characteristics of NaN.
What purpose do rules of operator associativity serve in a programming language?
Function: row_averagesParameter: An array of arrays of numbers.Returns: An array of the averages of each of the rows of the given matrix.Write, test, and debug (if necessary) JavaScript scripts for
Function: tst_nameParameter: A string.Returns: true if the given string has the formstring1, string2 letterwhere both strings must be all lowercase letters except for the firstletter and letter must
Function: counterParameter: An array of numbers.Returns: The numbers of negative elements, zeros, and values greaterthan zero in the given array.You must use a switch statement in the function.Write,
Function: first_vowelParameter: A string.Returns: The position in the string of the leftmost vowel.Write, test, and debug (if necessary) JavaScript scripts for the problem that above. When required
What purpose do rules of operator precedence serve in a programming language?
If the value undefined is used as a Boolean expression, is it interpreted as true or false?
In what circumstances would a variable have the value undefined?
Do single-quoted string literals have any characteristics different from those of double-quoted string literals?
What are the five primitive data types in JavaScript?
Function: no_zerosParameter: An array of numbers.Result: The given array must be modified to remove all zero values.Returns: true if the given array included zero values; false otherwise.Write, test,
Why are JavaScript scripts sometimes hidden in HTML documents by putting them into HTML comments?
What are the two forms of JavaScript comments?
Describe the two ways to embed a JavaScript script in an HTML document.
Input: A text string, using prompt.Output: Either "Valid name" or "Invalid name", depending on whether the input names fit the required format, which isLast name, first name, middle initialwhere
Why does JavaScript have two categories of data variables, namely, primitives and objects?
What are the two categories of properties in JavaScript?
Describe briefly the basic process of event-driven computation.
Describe briefly three major uses of JavaScript on the client side.
Describe briefly three major differences between Java and JavaScript.
If there are two conflicting specifications in a document-level style sheet, which of the two has precedence?
Which has higher precedence, a user-origin specification or a browser specification?
Which has higher precedence, an id selector or a universal selector (*)?
What is the purpose of the div element?
What layout information does a tag by itself indicate to the browser?
What is the purpose of the border-collapse property?

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