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. This returns only True or false values
for (counter; condition; incrementor) {}
toString(base)
<script type="text/javascript">.....</script>
confirm()

2. Math object method used to return the square root of a given number
charAt(position)
document.getElementById("ButtonId").onclick = functionName;
Underscores
Math.sqrt(number)

3. The escape sequence used to insert a Unicode character into a string in JavaScript
confirm()
udddd
document.getElementById("checkboxId").checked;
var dateVar = new Date()

4. The ________ tag is used to display the text between the opening and closing tag if JavaScript is disabled or otherwise not available
<noscript>
document.write("Text Here") //Remains on current line
alert("Alert Text Here")
toFixed(digits)

5. A list-like construct that has properties which corresponds to JavaScript values or variables or other objects.
concat(var1, var2, varN)
Objects
document.write("Text Here") //Remains on current line
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))

6. The string escape sequence to insert a backslash in JavaScript
Math.sqrt(number)
\
document.write("Text Here") //Remains on current line
toFixed(digits)

7. To test that a variable contains a valid number
isNaN(varHere) //Returns true or false.
global
document.getElementById("radioButtonId").checked;
n

8. Number object method used to round numbers to the specified number of decimal places
n
isNaN(varHere) //Returns true or false.
toFixed(digits)
'

9. The format to create a new Date object from a string
toFixed(digitCount)
document.getElementById("checkboxId").value;
for (counter; condition; incrementor) {}
var dateObject = new Date("11/22/2012 18:25:35")

10. What String object method returns a new string containing the value of the original string but in all lower case
toLowerCase()
var dateObject = new Date("11/22/2012 18:25:35")
var functionName = function(param1, param2, paramN) {}
while (condition) {}

11. To set the current value of the control for a text area
n
toTimeString()
document.getElementById("textAreaId").value = "Text Value";
Objects

12. What String object method returns a new string containing the value of the original string but in all upper case
n
for (counter; condition; incrementor) {}
toUpperCase()
document.getElementById("ButtonId").onclick = functionName;

13. To write a line to the current element of the DOM (Document Object Model)
setMilliseconds()
var stringVar = "part 1:" + "part 2";
Math.floor(number)
document.writeln("Text Here") //Advances to new line after text

14. String object method used to concatenate multiple strings
concat(var1, var2, varN)
getFullYear()
var answerVar = confirm("Message Text Here")
setMilliseconds()

15. To insert Javascript into a web page
<script type="text/javascript">.....</script>
Multi line
f
event handler .

16. To get the current value for textboxes
document.getElementById("TextBoxId").value;
var arrayVar = new Array()
getFullYear()
alert("Alert Text Here")

17. What Date object method is used to return the number of milliseconds since the start of GMT
Math.abs(number)
getTime()
document.getElementById("listId").value;
toDateString()

18. The string escape sequence to start a new line in JavaScript
var dateObject = new Date("11/22/2012 18:25:35")
n
document.getElementById("CheckboxId").checked = true; //Could also be false
charAt(position)

19. To assign actions to the window onLoad event
window.onload = function() {//actions here}
document.getElementById("CheckboxId").checked = true; //Could also be false
document.getElementById("ButtonId").onclick = functionName;
charAt(position)

20. The two methods common to most controls: ______ //Brings focus to the control blur //Removes focus from the control
document.getElementById("TextBoxId").disabled = true;
document.getElementById("radioButtonId").checked;
var arrayVar = new Array()
focus

21. To set the control to be disabled for textboxes
document.getElementById("TextBoxId").disabled = true;
Underscores
Math.sqrt(number)
Math.max(var1, var2, varN)

22. To assign the return value of confirm() to a variable
focus
while (condition) {}
var answerVar = confirm("Message Text Here")
Math.abs(number)

23. ________ comments start with / and end with /.
Either single or double quotes surrounding the data
Multi line
Math.max(var1, var2, varN)
setMilliseconds()

24. To create a new Date object
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
if (condition) {}
toFixed(digits)
semicolon ";"

25. To write text to the current element of the DOM
document.write("Text Here") //Remains on current line
confirm("Message Text Here")
toTimeString()
indexOf(searchValue, startPosition)

26. To assign the value from a prompt to a non-string variable
document.getElementById("spanId").firstChild;
isNaN(varHere) //Returns true or false.
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
var variableName;

27. Number object method used to return a number in exponential format with the specified number of decimal places
toExponential(digits)
<noscript>
t
var stringVar = prompt("Text Here")

28. To get the value or the currently selected item for lists
for (counter; condition; incrementor) {}
document.getElementById("listId").value;
Underscores
n

29. The identity operator for equals
toExponential(digits)
===
(Condition_Expression) ? Value_If_True : Value_If_False;
concat(var1, var2, varN)

30. 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
Math.max(var1, var2, varN)
document.getElementById("TextBoxId").value;
Math.sqrt(number)
substring(startIndex, stopIndex)

31. Math object method used to return the lowest value for a set of supplied numbers
var stringVar = prompt("Text Here")
Math.min(var1, var2, varN)
f
document.getElementById("radioButtonId").checked = true; //Could also be false

32. To get the current checked status of the control for checkboxes
\
document.getElementById("checkboxId").checked;
Charset
document.getElementById("CheckboxId").checked = true; //Could also be false

33. The string escape sequence to insert a tab in JavaScript
document.getElementById("spanId").firstChild;
t
document.getElementById("TextBoxId").value;
var answerVar = confirm("Message Text Here")

34. The string escape sequence to insert a vertical tab in JavaScript
v
var stringVar = prompt("Text Here")
toPrecision(precision)
while (condition) {}

35. The string escape sequence to insert a form feed in JavaScript
f
prompt("Text Here")
semicolon ";"
indexOf(searchValue, startPosition)

36. Command to display a prompt
document.getElementById("listId").value;
t
prompt("Text Here")
var functionName = function(param1, param2, paramN) {}

37. The _____ attribute is used to denote external file for script use
===
document.getElementById("TextBoxId").focus;
toLowerCase()
Src - e.g. <script src="fileName.js"> //

38. To get the text value of the control for radio buttons
ondblclick
document.getElementById("checkboxId").value;
document.getElementById("radioButtonId").value;
concat(var1, var2, varN)

39. Math object method used to return the absolute value of a given number
toFixed(digits)
while (condition) {}
document.getElementById("textAreaId").value = "Text Value";
Math.abs(number)

40. To denote a string in JavaScript
Either single or double quotes surrounding the data
Multi line
document.writeln("Text Here") //Advances to new line after text
document.getElementById("TextBoxId").focus;

41. When you __________ a javascript variable it retains its original value
redeclare
alert("Alert Text Here")
toDateString()
Math.sqrt(number)

42. To set focus on the control for textboxes
alert("Alert Text Here")
document.getElementById("TextBoxId").focus;
!==
var functionName = function(param1, param2, paramN) {}

43. To get the current value of the control for a text area
'
toLowerCase()
document.getElementById("textAreaId").value;
window.onload = function() {//actions here}

44. To view the current web address using JavaScript
window.location()
event handler .
document.getElementById("textAreaId").value;
setMilliseconds()

45. To get the text value of the control for radio buttons
document.getElementById("textAreaId").value = "Text Value";
redeclare
document.getElementById("checkboxId").value;
t

46. To code an If statement in JavaScript
document.getElementById("radioButtonId").checked = true; //Could also be false
indexOf(searchValue, startPosition)
if (condition) {}
===

47. JavaScript is case _______
window.onload = function() {//actions here}
var variableName;
sensitive
Math.random() //Returns a value >= 0.0 but <1.0

48. Math object method used to return the highest value from a set of supplied numbers
alert("Alert Text Here")
Math.max(var1, var2, varN)
concat(var1, var2, varN)
Math.sqrt(number)

49. Math object method used to return a given number rounded to the next highest integer value
getFullYear()
f
Math.ceil(number)
document.getElementById("checkboxId").value;

50. The string escape sequence to insert a carriage return in JavaScript
'
r
toUpperCase()
document.getElementById("CheckboxId").checked = true; //Could also be false