Test your basic knowledge |

Javascript Basics

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. To access a page element by id
charAt(position)
toFixed(digits)
Multi line
document.getElementById(id)

2. A function that is called with a certain event occurs - e.g. button.onclick and window.onload.
event handler .
standard equality operators
!==
toLowerCase()

3. To assign the value from a prompt to a string
Math.pow(number, power)
prompt("Text Here")
Charset
var stringVar = prompt("Text Here")

4. To set the digit precision of a decimal number
Math.round(number)
toFixed(digitCount)
toUpperCase()
window.onload = function() {//actions here}

5. A _______ variable can be changed and accessed from within and without a function or object.
global
document.getElementById("radioButtonId").checked = true; //Could also be false
toString()
substring(startIndex)

6. What String object method returns a new string containing the value of the original string but in all upper case
Math.round(number)
toUpperCase()
var dateObject = new Date("11/22/2012 18:25:35")
document.getElementById("spanId").firstChild.nodeValue = "New Value";

7. Command to display a prompt
document.getElementById("checkboxId").checked;
prompt("Text Here")
substring(startIndex, stopIndex)
var dateVar = new Date()

8. To display a confirmation
substring(startIndex, stopIndex)
"
focus
confirm("Message Text Here")

9. Math object method used to return a given number that has been rounded to the closes integer value
Either single or double quotes surrounding the data
Math.min(var1, var2, varN)
Math.round(number)
isNaN(varHere) //Returns true or false.

10. The syntax of a conditional operator
isNaN(varHere) //Returns true or false.
Number.NEGATIVE_INFINITY
(Condition_Expression) ? Value_If_True : Value_If_False;
expression

11. To alter the value of the text element in a span tag
standard equality operators
Math.pow(number, power)
f
document.getElementById("spanId").firstChild.nodeValue = "New Value";

12. Number object method used to round numbers to the specified number of decimal places
udddd
getFullYear()
standard equality operators
toFixed(digits)

13. To assign the return value of confirm() to a variable
Math.random() //Returns a value >= 0.0 but <1.0
var answerVar = confirm("Message Text Here")
Underscores
var dateVar = new Date()

14. To create an Array object in JavaScript
document.getElementById("listId").value;
var arrayVar = new Array()
Number.NEGATIVE_INFINITY
\

15. Math object method used to return the lowest value for a set of supplied numbers
Math.min(var1, var2, varN)
Math.random() //Returns a value >= 0.0 but <1.0
window.onload = function() {//actions here}
Math.floor(number)

16. To code an If statement in JavaScript
document.getElementById("textAreaId").value = "Text Value";
if (condition) {}
v
Use the second parameter. Example: prompt("Enter Age:", "18")

17. To assign a default value to a prompt
for (counter; condition; incrementor) {}
<script type="text/javascript">.....</script>
toTimeString()
Use the second parameter. Example: prompt("Enter Age:", "18")

18. When you __________ a javascript variable it retains its original value
redeclare
Underscores
toPrecision(precision)
f

19. Number object method used to return a numerical string with the specified number of significant digits
isNaN(varHere) //Returns true or false.
substring(startIndex, stopIndex)
toPrecision(precision)
f

20. The string escape sequence to insert a form feed in JavaScript
document.getElementById("radioButtonId").checked = true; //Could also be false
f
document.getElementById(id)
Two forward slashes "//"

21. To create a Date object in JavaScript
Math.random() //Returns a value >= 0.0 but <1.0
var dateVar = new Date()
document.getElementById("checkboxId").value;
toString()

22. String object method used to get the character at a specified index position
Number.NEGATIVE_INFINITY
document.getElementById("spanId").firstChild.nodeValue = "New Value";
document.writeln("Text Here") //Advances to new line after text
charAt(position)

23. To insert Javascript into a web page
document.getElementById("textAreaId").value = "Text Value";
toFixed(digits)
<script type="text/javascript">.....</script>
standard equality operators

24. To create a function in JavaScript
substring(startIndex, stopIndex)
v
document.getElementById("radioButtonId").value;
var functionName = function(param1, param2, paramN) {}

25. Math object method used to return a given number rounded to the next lowest integer value
var dateObject = new Date("11/22/2012 18:25:35")
"
document.getElementById("listId").value;
Math.floor(number)

26. The string escape sequence to insert a vertical tab in JavaScript
v
toString()
semicolon ";"
===

27. To create a single line comment in JavaScript
Two forward slashes "//"
sensitive
substring(startIndex, stopIndex)
document.getElementById(id)

28. To write text to the current element of the DOM
document.write("Text Here") //Remains on current line
confirm()
Objects
Src - e.g. <script src="fileName.js"> //

29. The identity operator for equals
charAt(position)
var arrayVar = new Array()
===
indexOf(searchValue, startPosition)

30. ________ comments start with / and end with /.
expression
prompt("Text Here")
Use the second parameter. Example: prompt("Enter Age:", "18")
Multi line

31. Math object method used to return a given number raised to a given power
Math.pow(number, power)
Math.min(var1, var2, varN)
document.getElementById("checkboxId").checked;
event handler .

32. Math object method used to return a given number rounded to the next highest integer value
Math.ceil(number)
var variableName;
focus
toTimeString()

33. To get the current value for textboxes
document.getElementById("TextBoxId").value;
document.getElementById("checkboxId").value;
alert("Alert Text Here")
setMilliseconds()

34. The string escape sequence to start a new line in JavaScript
toLowerCase()
event handler .
Math.pow(number, power)
n

35. Date object method used to return a string containing the date and time
toLowerCase()
toString()
document.getElementById("textAreaId").value;
r

36. To get the text value of the control for radio buttons
window.onload = function() {//actions here}
Math.round(number)
document.getElementById("checkboxId").value;
Math.max(var1, var2, varN)

37. To get the value or the currently selected item for lists
window.location()
document.getElementById(id)
document.getElementById("listId").value;
sensitive

38. Math object method used to return the square root of a given number
Math.sqrt(number)
setMilliseconds()
r
substring(startIndex, stopIndex)

39. The four attributes of the <script> tag:Type - Src - _____ and Defer
var arrayVar = new Array()
global
Charset
document.getElementById("TextBoxId").focus;

40. The available get methods for a Date object: getTime() - _________ - getMonth() - getDate() - getHours() - getMinutes() - getSeconds() - getMilliseconds()
document.writeln("Text Here") //Advances to new line after text
event handler .
getFullYear()
'

41. To code a for statement in JavaScript
toFixed(digitCount)
for (counter; condition; incrementor) {}
document.getElementById("TextBoxId").disabled = true;
toExponential(digits)

42. The string escape sequence to insert a single quote in JavaScript

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

43. To write a line to the current element of the DOM (Document Object Model)
Underscores
document.writeln("Text Here") //Advances to new line after text
Multi line
string

44. JavaScript is case _______
sensitive
document.getElementById("CheckboxId").checked = true; //Could also be false
document.write("Text Here") //Remains on current line
udddd

45. To make the browser load a new page using JavaScript
document.getElementById("spanId").firstChild.nodeValue = "New Value";
window.location = "New Web Address Here";
toFixed(digits)
Objects

46. To display an alert
alert("Alert Text Here")
prompt("Text Here")
for (counter; condition; incrementor) {}
n

47. To test that a variable contains a valid number
redeclare
isNaN(varHere) //Returns true or false.
Math.abs(number)
document.getElementById("listId").value;

48. The events common to most controls: onfocus - onblur - onclick - _______ - onchange - onselect
focus
(Condition_Expression) ? Value_If_True : Value_If_False;
ondblclick
toPrecision(precision)

49. To access the text element in a <span> tag
focus
Two forward slashes "//"
document.getElementById("spanId").firstChild;
standard equality operators

50. The ________ tag is used to display the text between the opening and closing tag if JavaScript is disabled or otherwise not available
<script type="text/javascript">.....</script>
<noscript>
document.getElementById("listId").value;
var stringVar = "part 1:" + "part 2";