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. The available properties for the Number object: Number.MAX_VALUE - Number.MIN_VALUE - Number.POSITIVE_INFINITY - _______ - Number.NaN
isNaN(varHere) //Returns true or false.
var dateVar = new Date()
Number.NEGATIVE_INFINITY
document.getElementById("checkboxId").value;

2. To assign the return value of confirm() to a variable
document.getElementById("textAreaId").value;
var answerVar = confirm("Message Text Here")
n
r

3. Math object method used to return a random number
Math.random() //Returns a value >= 0.0 but <1.0
substring(startIndex, stopIndex)
document.writeln("Text Here") //Advances to new line after text
Math.abs(number)

4. Number object method used to return a numerical string with the specified number of significant digits
toFixed(digitCount)
document.getElementById("ButtonId").onclick = functionName;
toPrecision(precision)
document.getElementById("checkboxId").value;

5. To assign actions to the window onLoad event
substring(startIndex, stopIndex)
document.getElementById(id)
string
window.onload = function() {//actions here}

6. To display an alert
toExponential(digits)
alert("Alert Text Here")
document.getElementById("textAreaId").value;
getFullYear()

7. To test that a variable contains a valid number
window.location = "New Web Address Here";
t
!==
isNaN(varHere) //Returns true or false.

8. To get the current checked status of the control for checkboxes
Number.NEGATIVE_INFINITY
toPrecision(precision)
redeclare
document.getElementById("checkboxId").checked;

9. To assign the value from a prompt to a non-string variable
confirm()
toString()
<noscript>
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))

10. String object method used to return a new string that contains part of the original string from the specified start position
confirm("Message Text Here")
substring(startIndex)
document.getElementById("spanId").firstChild.nodeValue = "New Value";
window.location()

11. Date object method used to return a string containing the date and time
Src - e.g. <script src="fileName.js"> //
toString()
var functionName = function(param1, param2, paramN) {}
toString(base)

12. The events common to most controls: onfocus - onblur - onclick - _______ - onchange - onselect
v
Math.floor(number)
ondblclick
Math.max(var1, var2, varN)

13. To get the text value of the control for radio buttons
document.getElementById("spanId").firstChild.nodeValue = "New Value";
document.getElementById("checkboxId").value;
Src - e.g. <script src="fileName.js"> //
toDateString()

14. Math object method used to return the highest value from a set of supplied numbers
Math.max(var1, var2, varN)
for (counter; condition; incrementor) {}
Number.NEGATIVE_INFINITY
var dateObject = new Date("11/22/2012 18:25:35")

15. To get the text value of the control for radio buttons
document.getElementById("listId").value;
var dateVar = new Date()
global
document.getElementById("radioButtonId").value;

16. To insert Javascript into a web page
string
toString(base)
var answerVar = confirm("Message Text Here")
<script type="text/javascript">.....</script>

17. The valid characters for an identifier in JavaScript: Letters - Numbers - ________ and Dollar Signs
toString(base)
concat(var1, var2, varN)
Underscores
substring(startIndex)

18. To assign the value from a prompt to a string
\
var stringVar = prompt("Text Here")
Math.min(var1, var2, varN)
'

19. To get the value or the currently selected item for lists
document.getElementById("listId").value;
substring(startIndex, stopIndex)
alert("Alert Text Here")
Math.pow(number, power)

20. A function that is called with a certain event occurs - e.g. button.onclick and window.onload.
event handler .
if (condition) {}
document.getElementById("CheckboxId").checked = true; //Could also be false
var dateObject = new Date("11/22/2012 18:25:35")

21. Math object method used to return a given number that has been rounded to the closes integer value
Charset
redeclare
Math.round(number)
===

22. To access a page element by id
window.location()
toExponential(digits)
document.getElementById(id)
var answerVar = confirm("Message Text Here")

23. What String object method returns a new string containing the value of the original string but in all lower case
window.location = "New Web Address Here";
toLowerCase()
document.getElementById("checkboxId").value;
sensitive

24. The string escape sequence to insert a carriage return in JavaScript
document.getElementById("radioButtonId").checked;
semicolon ";"
'
r

25. To access the text element in a <span> tag
confirm("Message Text Here")
Objects
document.getElementById("spanId").firstChild;
var dateVar = new Date()

26. To display a confirmation
concat(var1, var2, varN)
toString(base)
Use the second parameter. Example: prompt("Enter Age:", "18")
confirm("Message Text Here")

27. To code an If statement in JavaScript
if (condition) {}
document.writeln("Text Here") //Advances to new line after text
sensitive
'

28. To set the current checked status of the control for checkboxes
v
document.getElementById("CheckboxId").checked = true; //Could also be false
confirm("Message Text Here")
var dateVar = new Date()

29. JavaScript is case _______
toPrecision(precision)
Math.max(var1, var2, varN)
sensitive
Underscores

30. The _____ attribute is used to denote external file for script use
var arrayVar = new Array()
var functionName = function(param1, param2, paramN) {}
Src - e.g. <script src="fileName.js"> //
document.writeln("Text Here") //Advances to new line after text

31. Unlike ________________ identity operators do not perform type coercion.
===
Math.max(var1, var2, varN)
standard equality operators
udddd

32. To create a single line comment in JavaScript
Number.NEGATIVE_INFINITY
window.location = "New Web Address Here";
Two forward slashes "//"
===

33. What Date object method is used to return the number of milliseconds since the start of GMT
Math.sqrt(number)
\
getTime()
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))

34. The ________ tag is used to display the text between the opening and closing tag if JavaScript is disabled or otherwise not available
Math.max(var1, var2, varN)
window.onload = function() {//actions here}
<noscript>
Src - e.g. <script src="fileName.js"> //

35. The available set methods for a Date object: setFullYear() - setMonth() - setDate() - setHours() - setMinutes() - setSeconds() - _________
document.getElementById("CheckboxId").checked = true; //Could also be false
setMilliseconds()
Use the second parameter. Example: prompt("Enter Age:", "18")
toString(base)

36. To set the current value of the control for a text area
toTimeString()
var answerVar = confirm("Message Text Here")
Use the second parameter. Example: prompt("Enter Age:", "18")
document.getElementById("textAreaId").value = "Text Value";

37. The syntax of a conditional operator
(Condition_Expression) ? Value_If_True : Value_If_False;
document.getElementById("radioButtonId").checked;
n
"

38. The two methods common to most controls: ______ //Brings focus to the control blur //Removes focus from the control
indexOf(searchValue, startPosition)
semicolon ";"
focus
document.getElementById("listId").value;

39. String object method used to return a new string that contains part of the original string from the specified start position and up to but not including the specified stop index
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
f
string
substring(startIndex, stopIndex)

40. Math object method used to return the square root of a given number
document.getElementById("spanId").firstChild;
Math.sqrt(number)
confirm()
standard equality operators

41. The string escape sequence to insert a backslash in JavaScript
toFixed(digitCount)
global
document.getElementById("spanId").firstChild;
\

42. To code a for statement in JavaScript
document.getElementById(id)
<noscript>
document.getElementById("TextBoxId").disabled = true;
for (counter; condition; incrementor) {}

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

44. Math object method used to return the lowest value for a set of supplied numbers
document.getElementById("ButtonId").onclick = functionName;
Math.min(var1, var2, varN)
Two forward slashes "//"
toFixed(digits)

45. To set the digit precision of a decimal number
Math.min(var1, var2, varN)
var answerVar = confirm("Message Text Here")
toFixed(digitCount)
Multi line

46. Math object method used to return the absolute value of a given number
document.getElementById("radioButtonId").value;
toUpperCase()
Math.max(var1, var2, varN)
Math.abs(number)

47. To view the current web address using JavaScript
window.location()
Math.abs(number)
n
toFixed(digitCount)

48. To write text to the current element of the DOM
document.write("Text Here") //Remains on current line
toLowerCase()
concat(var1, var2, varN)
Math.pow(number, power)

49. To create a Date object in JavaScript
while (condition) {}
var dateVar = new Date()
indexOf(searchValue, startPosition)
string

50. The string escape sequence to insert a vertical tab in JavaScript
toTimeString()
Two forward slashes "//"
document.write("Text Here") //Remains on current line
v