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 create a single line comment in JavaScript
Underscores
Two forward slashes "//"
var variableName;
Math.sqrt(number)

2. To get the text value of the control for radio buttons
document.getElementById("checkboxId").value;
Math.pow(number, power)
for (counter; condition; incrementor) {}
Two forward slashes "//"

3. To create a function that returns a value in JavaScript
var functionName = function(param1, param2, paramN) {}
string
event handler .
document.getElementById("TextBoxId").value;

4. To code a while statement in JavaScript
while (condition) {}
toString()
indexOf(searchValue, startPosition)
toDateString()

5. To display an alert
Math.pow(number, power)
alert("Alert Text Here")
getTime()
var answerVar = confirm("Message Text Here")

6. To write a line to the current element of the DOM (Document Object Model)
event handler .
var variableName;
Two forward slashes "//"
document.writeln("Text Here") //Advances to new line after text

7. The ________ tag is used to display the text between the opening and closing tag if JavaScript is disabled or otherwise not available
\
Math.sqrt(number)
<noscript>
var functionName = function(param1, param2, paramN) {}

8. The string escape sequence to insert a tab in JavaScript
\
window.location = "New Web Address Here";
event handler .
t

9. JavaScript is case _______
document.getElementById("listId").value;
Math.floor(number)
sensitive
toString(base)

10. What String object method returns a new string containing the value of the original string but in all lower case
Math.floor(number)
var dateVar = new Date()
charAt(position)
toLowerCase()

11. To test that a variable contains a valid number
var stringVar = prompt("Text Here")
Multi line
isNaN(varHere) //Returns true or false.
window.location()

12. To code a button.onclick event handler
window.location()
Objects
n
document.getElementById("ButtonId").onclick = functionName;

13. To assign actions to the window onLoad event
Use the second parameter. Example: prompt("Enter Age:", "18")
window.onload = function() {//actions here}
var functionName = function(param1, param2, paramN) {}
(Condition_Expression) ? Value_If_True : Value_If_False;

14. To access a page element by id
document.getElementById(id)
Math.min(var1, var2, varN)
document.getElementById("radioButtonId").checked;
Charset

15. To write text to the current element of the DOM
document.getElementById("radioButtonId").checked = true; //Could also be false
document.getElementById("TextBoxId").disabled = true;
prompt("Text Here")
document.write("Text Here") //Remains on current line

16. To create a function in JavaScript
var functionName = function(param1, param2, paramN) {}
standard equality operators
document.getElementById("checkboxId").value;
window.location()

17. The string escape sequence to insert a vertical tab in JavaScript
Math.ceil(number)
Math.max(var1, var2, varN)
v
Math.random() //Returns a value >= 0.0 but <1.0

18. To assign the return value of confirm() to a variable
Number.NEGATIVE_INFINITY
var answerVar = confirm("Message Text Here")
r
toFixed(digits)

19. String object method used to concatenate multiple strings
var functionName = function(param1, param2, paramN) {}
concat(var1, var2, varN)
expression
getFullYear()

20. To get the text value of the control for radio buttons
document.getElementById("radioButtonId").value;
var dateObject = new Date("11/22/2012 18:25:35")
udddd
alert("Alert Text Here")

21. ________ comments start with / and end with /.
Either single or double quotes surrounding the data
Number.NEGATIVE_INFINITY
Multi line
\

22. To create a new Date object
toString(base)
n
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
document.getElementById("radioButtonId").checked;

23. This returns only True or false values
toString(base)
semicolon ";"
n
confirm()

24. The four attributes of the <script> tag:Type - Src - _____ and Defer
Multi line
Underscores
concat(var1, var2, varN)
Charset

25. Date object method used to return a string containing the date
var stringVar = prompt("Text Here")
Use the second parameter. Example: prompt("Enter Age:", "18")
document.getElementById("spanId").firstChild.nodeValue = "New Value";
toDateString()

26. The available get methods for a Date object: getTime() - _________ - getMonth() - getDate() - getHours() - getMinutes() - getSeconds() - getMilliseconds()
getFullYear()
toLowerCase()
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
document.getElementById("radioButtonId").checked = true; //Could also be false

27. The identity operator for not equal
toPrecision(precision)
!==
document.getElementById("textAreaId").value = "Text Value";
window.location = "New Web Address Here";

28. Statements end in JavaScript with a ________
document.getElementById("radioButtonId").value;
semicolon ";"
v
var answerVar = confirm("Message Text Here")

29. To display a confirmation
Either single or double quotes surrounding the data
confirm("Message Text Here")
toDateString()
Underscores

30. Math object method used to return the square root of a given number
Math.round(number)
Math.sqrt(number)
t
window.location()

31. To set the digit precision of a decimal number
document.getElementById("checkboxId").checked;
Number.NEGATIVE_INFINITY
var arrayVar = new Array()
toFixed(digitCount)

32. The valid characters for an identifier in JavaScript: Letters - Numbers - ________ and Dollar Signs
udddd
window.location()
var stringVar = "part 1:" + "part 2";
Underscores

33. Number object method used to return a string with a given number base
Math.sqrt(number)
document.getElementById(id)
standard equality operators
toString(base)

34. Math object method used to return the lowest value for a set of supplied numbers
focus
toString()
Math.min(var1, var2, varN)
redeclare

35. The string escape sequence to insert a backslash in JavaScript
udddd
\
focus
Charset

36. A list-like construct that has properties which corresponds to JavaScript values or variables or other objects.
toLowerCase()
'
Objects
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))

37. String object method used to get the character at a specified index position
Objects
charAt(position)
document.getElementById("TextBoxId").disabled = true;
indexOf(searchValue, startPosition)

38. The two methods common to most controls: ______ //Brings focus to the control blur //Removes focus from the control
var arrayVar = new Array()
var functionName = function(param1, param2, paramN) {}
document.getElementById("checkboxId").checked;
focus

39. To get the current value of the control for a text area
document.getElementById("radioButtonId").checked;
toString(base)
document.getElementById("textAreaId").value;
var variableName;

40. To concatenate multiple parts into a string
var stringVar = "part 1:" + "part 2";
Objects
'
focus

41. To set the control to be disabled for textboxes
document.getElementById("radioButtonId").value;
Multi line
document.getElementById("TextBoxId").disabled = true;
toString(base)

42. To make the browser load a new page using JavaScript
Math.random() //Returns a value >= 0.0 but <1.0
toFixed(digitCount)
"
window.location = "New Web Address Here";

43. The format to create a new Date object from a string
substring(startIndex)
Two forward slashes "//"
var dateObject = new Date("11/22/2012 18:25:35")
getTime()

44. A function that is called with a certain event occurs - e.g. button.onclick and window.onload.
var arrayVar = new Array()
Math.max(var1, var2, varN)
prompt("Text Here")
event handler .

45. To set the current value of the control for a text area
var functionName = function(param1, param2, paramN) {}
document.getElementById("textAreaId").value = "Text Value";
document.getElementById("TextBoxId").disabled = true;
Math.ceil(number)

46. When you add a string and a number the result will be a ____
string
<noscript>
Multi line
standard equality operators

47. Math object method used to return the highest value from a set of supplied numbers
udddd
Math.max(var1, var2, varN)
var answerVar = confirm("Message Text Here")
global

48. The available set methods for a Date object: setFullYear() - setMonth() - setDate() - setHours() - setMinutes() - setSeconds() - _________
var dateVar = new Date()
document.getElementById("TextBoxId").value;
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
setMilliseconds()

49. To get the current checked status of the control for radio buttons
Math.ceil(number)
document.getElementById("radioButtonId").checked;
document.getElementById("spanId").firstChild.nodeValue = "New Value";
confirm()

50. Math object method used to return a given number rounded to the next highest integer value
document.getElementById("ButtonId").onclick = functionName;
Use the second parameter. Example: prompt("Enter Age:", "18")
\
Math.ceil(number)