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 set the current checked status of the control for checkboxes
!==
var variableName;
document.getElementById("CheckboxId").checked = true; //Could also be false
if (condition) {}

2. To access the text element in a <span> tag
document.getElementById("spanId").firstChild;
Number.NEGATIVE_INFINITY
focus
setMilliseconds()

3. Statements end in JavaScript with a ________
Charset
document.getElementById("radioButtonId").checked;
semicolon ";"
var arrayVar = new Array()

4. Number object method used to return a string with a given number base
ondblclick
document.getElementById("checkboxId").value;
toFixed(digits)
toString(base)

5. The string escape sequence to insert a vertical tab in JavaScript
<noscript>
t
v
document.write("Text Here") //Remains on current line

6. To assign actions to the window onLoad event
window.location()
window.onload = function() {//actions here}
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
expression

7. Math object method used to return a given number rounded to the next lowest integer value
toFixed(digits)
Math.floor(number)
window.onload = function() {//actions here}
toString()

8. The ________ tag is used to display the text between the opening and closing tag if JavaScript is disabled or otherwise not available
Underscores
var arrayVar = new Array()
var functionName = function(param1, param2, paramN) {}
<noscript>

9. The escape sequence used to insert a Unicode character into a string in JavaScript
concat(var1, var2, varN)
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
Number.NEGATIVE_INFINITY
udddd

10. The available properties for the Number object: Number.MAX_VALUE - Number.MIN_VALUE - Number.POSITIVE_INFINITY - _______ - Number.NaN
Two forward slashes "//"
redeclare
toLowerCase()
Number.NEGATIVE_INFINITY

11. The string escape sequence to insert a tab in JavaScript
Number.NEGATIVE_INFINITY
n
t
document.writeln("Text Here") //Advances to new line after text

12. To get the current value for textboxes
confirm("Message Text Here")
document.getElementById("TextBoxId").value;
window.location = "New Web Address Here";
confirm()

13. The syntax of a conditional operator
confirm("Message Text Here")
document.write("Text Here") //Remains on current line
while (condition) {}
(Condition_Expression) ? Value_If_True : Value_If_False;

14. Math object method used to return a given number raised to a given power
document.getElementById("spanId").firstChild;
while (condition) {}
for (counter; condition; incrementor) {}
Math.pow(number, power)

15. To create a function in JavaScript
document.writeln("Text Here") //Advances to new line after text
confirm("Message Text Here")
document.getElementById("TextBoxId").disabled = true;
var functionName = function(param1, param2, paramN) {}

16. The available set methods for a Date object: setFullYear() - setMonth() - setDate() - setHours() - setMinutes() - setSeconds() - _________
concat(var1, var2, varN)
setMilliseconds()
n
var stringVar = "part 1:" + "part 2";

17. To set focus on the control for textboxes
document.getElementById("TextBoxId").focus;
Objects
semicolon ";"
standard equality operators

18. To make the browser load a new page using JavaScript
window.location = "New Web Address Here";
Two forward slashes "//"
window.onload = function() {//actions here}
Math.random() //Returns a value >= 0.0 but <1.0

19. When you __________ a javascript variable it retains its original value
redeclare
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
document.getElementById("CheckboxId").checked = true; //Could also be false
setMilliseconds()

20. A function that is called with a certain event occurs - e.g. button.onclick and window.onload.
event handler .
Either single or double quotes surrounding the data
toString(base)
document.getElementById("spanId").firstChild;

21. To declare a variable in JavaScript
window.location = "New Web Address Here";
toUpperCase()
concat(var1, var2, varN)
var variableName;

22. The four attributes of the <script> tag:Type - Src - _____ and Defer
Charset
var dateObject = new Date("11/22/2012 18:25:35")
document.getElementById(id)
substring(startIndex, stopIndex)

23. To denote a string in JavaScript
document.getElementById("TextBoxId").focus;
Either single or double quotes surrounding the data
toFixed(digits)
string

24. To code an If statement in JavaScript
if (condition) {}
Charset
event handler .
document.getElementById("radioButtonId").value;

25. To alter the value of the text element in a span tag
document.getElementById("spanId").firstChild.nodeValue = "New Value";
'
global
Either single or double quotes surrounding the data

26. A _______ variable can be changed and accessed from within and without a function or object.
Number.NEGATIVE_INFINITY
global
Underscores
<noscript>

27. To set the current value of the control for a text area
document.getElementById(id)
Src - e.g. <script src="fileName.js"> //
document.getElementById("textAreaId").value = "Text Value";
document.getElementById("TextBoxId").value;

28. Number object method used to return a numerical string with the specified number of significant digits
document.getElementById("listId").value;
substring(startIndex, stopIndex)
toPrecision(precision)
document.writeln("Text Here") //Advances to new line after text

29. Math object method used to return a random number
getFullYear()
toString(base)
document.getElementById("ButtonId").onclick = functionName;
Math.random() //Returns a value >= 0.0 but <1.0

30. To write a line to the current element of the DOM (Document Object Model)
toPrecision(precision)
string
document.writeln("Text Here") //Advances to new line after text
Math.sqrt(number)

31. The identity operator for equals
===
document.getElementById("TextBoxId").disabled = true;
udddd
<noscript>

32. Date object method used to return a string containing the date and time
n
Either single or double quotes surrounding the data
Objects
toString()

33. To assign the value from a prompt to a non-string variable
Math.sqrt(number)
document.getElementById("spanId").firstChild;
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
document.getElementById("textAreaId").value = "Text Value";

34. To get the current checked status of the control for checkboxes
t
Number.NEGATIVE_INFINITY
while (condition) {}
document.getElementById("checkboxId").checked;

35. Math object method used to return the lowest value for a set of supplied numbers
Math.min(var1, var2, varN)
!==
var arrayVar = new Array()
"

36. To concatenate multiple parts into a string
Math.min(var1, var2, varN)
toLowerCase()
document.getElementById("checkboxId").checked;
var stringVar = "part 1:" + "part 2";

37. Math object method used to return the absolute value of a given number
document.getElementById("ButtonId").onclick = functionName;
Math.min(var1, var2, varN)
var dateVar = new Date()
Math.abs(number)

38. The string escape sequence to start a new line in JavaScript
prompt("Text Here")
Two forward slashes "//"
document.getElementById("CheckboxId").checked = true; //Could also be false
n

39. To get the value or the currently selected item for lists
isNaN(varHere) //Returns true or false.
document.getElementById("textAreaId").value;
confirm("Message Text Here")
document.getElementById("listId").value;

40. To code a for statement in JavaScript
Number.NEGATIVE_INFINITY
toUpperCase()
expression
for (counter; condition; incrementor) {}

41. To create a single line comment in JavaScript
document.getElementById(id)
var functionName = function(param1, param2, paramN) {}
===
Two forward slashes "//"

42. What Date object method is used to return the number of milliseconds since the start of GMT
toTimeString()
getTime()
toDateString()
document.getElementById("TextBoxId").value;

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

44. To insert Javascript into a web page
<script type="text/javascript">.....</script>
Math.sqrt(number)
toTimeString()
toPrecision(precision)

45. To write text to the current element of the DOM
document.write("Text Here") //Remains on current line
document.getElementById("radioButtonId").value;
Number.NEGATIVE_INFINITY
Objects

46. The two methods common to most controls: ______ //Brings focus to the control blur //Removes focus from the control
var dateObject = new Date("11/22/2012 18:25:35")
if (condition) {}
focus
Math.max(var1, var2, varN)

47. The available get methods for a Date object: getTime() - _________ - getMonth() - getDate() - getHours() - getMinutes() - getSeconds() - getMilliseconds()
getFullYear()
Src - e.g. <script src="fileName.js"> //
indexOf(searchValue, startPosition)
toUpperCase()

48. To display a confirmation
var answerVar = confirm("Message Text Here")
confirm("Message Text Here")
r
confirm()

49. To set the control to be disabled for textboxes
focus
t
document.getElementById("TextBoxId").disabled = true;
toUpperCase()

50. The format to create a new Date object from a string
<script type="text/javascript">.....</script>
var dateObject = new Date("11/22/2012 18:25:35")
Two forward slashes "//"
document.getElementById("textAreaId").value = "Text Value";