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
var arrayVar = new Array()
document.getElementById(id)
setMilliseconds()
window.location()

2. The string escape sequence to insert a form feed in JavaScript
confirm("Message Text Here")
var dateVar = new Date()
(Condition_Expression) ? Value_If_True : Value_If_False;
f

3. The events common to most controls: onfocus - onblur - onclick - _______ - onchange - onselect
var functionName = function(param1, param2, paramN) {}
charAt(position)
ondblclick
alert("Alert Text Here")

4. To create an Array object in JavaScript
document.getElementById("radioButtonId").checked = true; //Could also be false
window.location()
Multi line
var arrayVar = new Array()

5. To assign the value from a prompt to a string
toFixed(digitCount)
var stringVar = prompt("Text Here")
document.getElementById("checkboxId").value;
Math.sqrt(number)

6. 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
document.getElementById("radioButtonId").value;
while (condition) {}
confirm()
substring(startIndex, stopIndex)

7. To get the current checked status of the control for checkboxes
document.getElementById("TextBoxId").value;
window.onload = function() {//actions here}
document.getElementById("ButtonId").onclick = functionName;
document.getElementById("checkboxId").checked;

8. The valid characters for an identifier in JavaScript: Letters - Numbers - ________ and Dollar Signs
Math.ceil(number)
'
redeclare
Underscores

9. The syntax of a conditional operator
ondblclick
(Condition_Expression) ? Value_If_True : Value_If_False;
var dateVar = new Date()
var dateObject = new Date("11/22/2012 18:25:35")

10. Math object method used to return a random number
Math.random() //Returns a value >= 0.0 but <1.0
Charset
alert("Alert Text Here")
(Condition_Expression) ? Value_If_True : Value_If_False;

11. The two methods common to most controls: ______ //Brings focus to the control blur //Removes focus from the control
focus
document.getElementById("CheckboxId").checked = true; //Could also be false
var functionName = function(param1, param2, paramN) {}
Use the second parameter. Example: prompt("Enter Age:", "18")

12. To make the browser load a new page using JavaScript
substring(startIndex, stopIndex)
r
window.location = "New Web Address Here";
Src - e.g. <script src="fileName.js"> //

13. Math object method used to return the absolute value of a given number
Math.abs(number)
Math.max(var1, var2, varN)
Two forward slashes "//"
Math.pow(number, power)

14. The _____ attribute is used to denote external file for script use
toPrecision(precision)
Objects
charAt(position)
Src - e.g. <script src="fileName.js"> //

15. Math object method used to return a given number raised to a given power
focus
ondblclick
document.getElementById(id)
Math.pow(number, power)

16. To create a new Date object
document.getElementById(id)
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
getFullYear()
t

17. The string escape sequence to insert a carriage return in JavaScript
window.location()
r
Math.min(var1, var2, varN)
<noscript>

18. To assign a default value to a prompt
'
Use the second parameter. Example: prompt("Enter Age:", "18")
v
var stringVar = "part 1:" + "part 2";

19. To create a single line comment in JavaScript
document.getElementById("radioButtonId").checked;
Two forward slashes "//"
confirm("Message Text Here")
semicolon ";"

20. Command to display a prompt
Math.ceil(number)
substring(startIndex)
window.location()
prompt("Text Here")

21. String object method used to return a new string that contains part of the original string from the specified start position
substring(startIndex)
document.getElementById("TextBoxId").value;
event handler .
alert("Alert Text Here")

22. Math object method used to return a given number rounded to the next highest integer value
toTimeString()
Math.random() //Returns a value >= 0.0 but <1.0
var stringVar = prompt("Text Here")
Math.ceil(number)

23. To assign the return value of confirm() to a variable
document.writeln("Text Here") //Advances to new line after text
toLowerCase()
\
var answerVar = confirm("Message Text Here")

24. The format to create a new Date object from a string
document.getElementById("textAreaId").value = "Text Value";
confirm()
var dateObject = new Date("11/22/2012 18:25:35")
Objects

25. Number object method used to return a numerical string with the specified number of significant digits
toPrecision(precision)
for (counter; condition; incrementor) {}
toLowerCase()
expression

26. To get the text value of the control for radio buttons
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
prompt("Text Here")
document.getElementById("radioButtonId").value;
toString()

27. Math object method used to return the lowest value for a set of supplied numbers
Math.min(var1, var2, varN)
toFixed(digitCount)
document.getElementById("textAreaId").value;
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)

28. What String object method returns a new string containing the value of the original string but in all upper case
var variableName;
toUpperCase()
!==
document.getElementById("radioButtonId").value;

29. To create a function that returns a value in JavaScript
document.getElementById("TextBoxId").focus;
getTime()
var functionName = function(param1, param2, paramN) {}
for (counter; condition; incrementor) {}

30. The string escape sequence to insert a tab in JavaScript
t
semicolon ";"
!==
document.getElementById("checkboxId").checked;

31. To display an alert
confirm("Message Text Here")
alert("Alert Text Here")
toString()
focus

32. The four attributes of the <script> tag:Type - Src - _____ and Defer
Charset
document.getElementById("radioButtonId").checked;
toString()
redeclare

33. The available set methods for a Date object: setFullYear() - setMonth() - setDate() - setHours() - setMinutes() - setSeconds() - _________
document.getElementById("TextBoxId").focus;
setMilliseconds()
getTime()
document.getElementById("checkboxId").checked;

34. When you add a string and a number the result will be a ____
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
document.getElementById("ButtonId").onclick = functionName;
<noscript>
string

35. To set the digit precision of a decimal number
substring(startIndex)
\
"
toFixed(digitCount)

36. To code a while statement in JavaScript
while (condition) {}
var dateVar = new Date()
toExponential(digits)
string

37. Number object method used to round numbers to the specified number of decimal places
toFixed(digits)
Math.abs(number)
toFixed(digitCount)
event handler .

38. When you __________ a javascript variable it retains its original value
Objects
redeclare
document.getElementById("radioButtonId").value;
document.getElementById("TextBoxId").disabled = true;

39. To insert Javascript into a web page
toUpperCase()
<script type="text/javascript">.....</script>
while (condition) {}
confirm()

40. To display a confirmation
confirm("Message Text Here")
isNaN(varHere) //Returns true or false.
document.getElementById("TextBoxId").value;
Two forward slashes "//"

41. To declare a variable in JavaScript
var variableName;
n
charAt(position)
toString()

42. To set the control to be disabled for textboxes
redeclare
Math.pow(number, power)
document.getElementById("TextBoxId").disabled = true;
var dateObject = new Date("11/22/2012 18:25:35")

43. To set focus on the control for textboxes
focus
Math.abs(number)
toExponential(digits)
document.getElementById("TextBoxId").focus;

44. To test that a variable contains a valid number
expression
Underscores
isNaN(varHere) //Returns true or false.
if (condition) {}

45. To assign actions to the window onLoad event
window.onload = function() {//actions here}
Math.pow(number, power)
if (condition) {}
Objects

46. String object method used to concatenate multiple strings
toExponential(digits)
toString()
redeclare
concat(var1, var2, varN)

47. A _______ variable can be changed and accessed from within and without a function or object.
global
alert("Alert Text Here")
toString(base)
while (condition) {}

48. To get the current checked status of the control for radio buttons
Math.random() //Returns a value >= 0.0 but <1.0
\
var stringVar = "part 1:" + "part 2";
document.getElementById("radioButtonId").checked;

49. ________ comments start with / and end with /.
document.getElementById(id)
toDateString()
Multi line
document.getElementById("spanId").firstChild.nodeValue = "New Value";

50. JavaScript is case _______
window.location()
alert("Alert Text Here")
sensitive
global