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 code a button.onclick event handler
<script type="text/javascript">.....</script>
document.getElementById("spanId").firstChild.nodeValue = "New Value";
document.getElementById("ButtonId").onclick = functionName;
isNaN(varHere) //Returns true or false.

2. The _____ attribute is used to denote external file for script use
var stringVar = "part 1:" + "part 2";
Src - e.g. <script src="fileName.js"> //
global
Math.abs(number)

3. The available set methods for a Date object: setFullYear() - setMonth() - setDate() - setHours() - setMinutes() - setSeconds() - _________
Math.sqrt(number)
var variableName;
document.getElementById("radioButtonId").checked = true; //Could also be false
setMilliseconds()

4. To get the current value of the control for a text area
document.getElementById("checkboxId").checked;
document.getElementById("textAreaId").value;
document.getElementById(id)
var functionName = function(param1, param2, paramN) {}

5. To access the text element in a <span> tag
toTimeString()
Src - e.g. <script src="fileName.js"> //
semicolon ";"
document.getElementById("spanId").firstChild;

6. To view the current web address using JavaScript
toTimeString()
window.location()
while (condition) {}
var variableName;

7. To display an alert
concat(var1, var2, varN)
alert("Alert Text Here")
document.getElementById("TextBoxId").value;
document.getElementById("checkboxId").checked;

8. To insert Javascript into a web page
Src - e.g. <script src="fileName.js"> //
<script type="text/javascript">.....</script>
toPrecision(precision)
charAt(position)

9. To make the browser load a new page using JavaScript
while (condition) {}
window.location = "New Web Address Here";
sensitive
for (counter; condition; incrementor) {}

10. A list-like construct that has properties which corresponds to JavaScript values or variables or other objects.
Objects
document.getElementById("radioButtonId").checked = true; //Could also be false
var dateVar = new Date()
Math.abs(number)

11. To declare a variable in JavaScript
window.onload = function() {//actions here}
var variableName;
toUpperCase()
event handler .

12. Math object method used to return the absolute value of a given number
Multi line
Either single or double quotes surrounding the data
Math.abs(number)
!==

13. To code an If statement in JavaScript
global
Math.max(var1, var2, varN)
if (condition) {}
var dateVar = new Date()

14. The format to create a new Date object from a string
\
document.getElementById("spanId").firstChild;
confirm("Message Text Here")
var dateObject = new Date("11/22/2012 18:25:35")

15. What Date object method is used to return the number of milliseconds since the start of GMT
Either single or double quotes surrounding the data
"
toDateString()
getTime()

16. To test that a variable contains a valid number
isNaN(varHere) //Returns true or false.
toLowerCase()
var functionName = function(param1, param2, paramN) {}
focus

17. To assign actions to the window onLoad event
window.onload = function() {//actions here}
toString(base)
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
toString()

18. To write text to the current element of the DOM
Math.pow(number, power)
v
document.write("Text Here") //Remains on current line
substring(startIndex, stopIndex)

19. Math object method used to return a random number
document.getElementById("TextBoxId").focus;
Math.random() //Returns a value >= 0.0 but <1.0
Objects
toLowerCase()

20. Date object method used to return a string containing the time
document.getElementById("textAreaId").value = "Text Value";
toUpperCase()
toDateString()
toTimeString()

21. Date object method used to return a string containing the date
document.getElementById("textAreaId").value;
Math.round(number)
redeclare
toDateString()

22. To set the control to be disabled for textboxes
document.getElementById("TextBoxId").disabled = true;
var functionName = function(param1, param2, paramN) {}
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
document.write("Text Here") //Remains on current line

23. To create a Date object in JavaScript
document.getElementById(id)
var dateVar = new Date()
Math.ceil(number)
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)

24. The ________ tag is used to display the text between the opening and closing tag if JavaScript is disabled or otherwise not available
toDateString()
var dateVar = new Date()
<noscript>
document.write("Text Here") //Remains on current line

25. The identity operator for equals
toTimeString()
document.writeln("Text Here") //Advances to new line after text
===
Math.round(number)

26. A statement that yields a value
n
var dateObject = new Date("11/22/2012 18:25:35")
expression
document.getElementById("spanId").firstChild;

27. To get the current checked status of the control for checkboxes
toLowerCase()
Math.min(var1, var2, varN)
document.getElementById("checkboxId").checked;
concat(var1, var2, varN)

28. Date object method used to return a string containing the date and time
charAt(position)
toString()
Two forward slashes "//"
n

29. Statements end in JavaScript with a ________
focus
semicolon ";"
"
redeclare

30. To create a single line comment in JavaScript
Two forward slashes "//"
<noscript>
alert("Alert Text Here")
f

31. To concatenate multiple parts into a string
var dateVar = new Date()
var stringVar = "part 1:" + "part 2";
var variableName;
Objects

32. To get the current checked status of the control for radio buttons
document.getElementById("radioButtonId").checked;
document.getElementById("TextBoxId").value;
Two forward slashes "//"
<script type="text/javascript">.....</script>

33. The available get methods for a Date object: getTime() - _________ - getMonth() - getDate() - getHours() - getMinutes() - getSeconds() - getMilliseconds()
<script type="text/javascript">.....</script>
getFullYear()
alert("Alert Text Here")
toFixed(digitCount)

34. The four attributes of the <script> tag:Type - Src - _____ and Defer
n
Math.max(var1, var2, varN)
Two forward slashes "//"
Charset

35. The two methods common to most controls: ______ //Brings focus to the control blur //Removes focus from the control
focus
prompt("Text Here")
var stringVar = "part 1:" + "part 2";
confirm()

36. A _______ variable can be changed and accessed from within and without a function or object.
\
redeclare
substring(startIndex, stopIndex)
global

37. The escape sequence used to insert a Unicode character into a string in JavaScript
udddd
substring(startIndex)
Number.NEGATIVE_INFINITY
Math.floor(number)

38. Number object method used to return a string with a given number base
Math.floor(number)
getTime()
Either single or double quotes surrounding the data
toString(base)

39. To set the current checked status of the control for checkboxes
<noscript>
if (condition) {}
document.getElementById("CheckboxId").checked = true; //Could also be false
document.getElementById("listId").value;

40. Number object method used to return a number in exponential format with the specified number of decimal places
toTimeString()
Math.floor(number)
Two forward slashes "//"
toExponential(digits)

41. Unlike ________________ identity operators do not perform type coercion.
toFixed(digits)
Objects
standard equality operators
Math.round(number)

42. To assign the value from a prompt to a non-string variable
\
toTimeString()
document.getElementById("checkboxId").value;
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))

43. When you __________ a javascript variable it retains its original value
redeclare
document.getElementById("ButtonId").onclick = functionName;
var dateVar = new Date()
standard equality operators

44. To alter the value of the text element in a span tag
document.getElementById("spanId").firstChild.nodeValue = "New Value";
document.getElementById("radioButtonId").checked = true; //Could also be false
!==
toTimeString()

45. The string escape sequence to insert a tab in JavaScript
window.onload = function() {//actions here}
window.location()
t
Either single or double quotes surrounding the data

46. To get the text value of the control for radio buttons
document.getElementById("checkboxId").value;
var arrayVar = new Array()
document.getElementById("listId").value;
indexOf(searchValue, startPosition)

47. The events common to most controls: onfocus - onblur - onclick - _______ - onchange - onselect
ondblclick
toFixed(digitCount)
setMilliseconds()
toUpperCase()

48. String object method used to concatenate multiple strings
document.getElementById("listId").value;
concat(var1, var2, varN)
document.getElementById(id)
var functionName = function(param1, param2, paramN) {}

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

50. This returns only True or false values
var answerVar = confirm("Message Text Here")
Use the second parameter. Example: prompt("Enter Age:", "18")
prompt("Text Here")
confirm()