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 write a line to the current element of the DOM (Document Object Model)
<noscript>
var answerVar = confirm("Message Text Here")
document.writeln("Text Here") //Advances to new line after text
Math.abs(number)

2. The string escape sequence to insert a vertical tab in JavaScript
var stringVar = "part 1:" + "part 2";
v
prompt("Text Here")
semicolon ";"

3. Date object method used to return a string containing the date and time
var arrayVar = new Array()
toString()
if (condition) {}
for (counter; condition; incrementor) {}

4. Number object method used to return a string with a given number base
toString(base)
Either single or double quotes surrounding the data
Objects
window.location = "New Web Address Here";

5. The events common to most controls: onfocus - onblur - onclick - _______ - onchange - onselect
toString(base)
ondblclick
Math.sqrt(number)
var functionName = function(param1, param2, paramN) {}

6. Statements end in JavaScript with a ________
Objects
'
document.getElementById(id)
semicolon ";"

7. To set the current checked status of the control for checkboxes
var stringVar = "part 1:" + "part 2";
document.getElementById("CheckboxId").checked = true; //Could also be false
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
window.location()

8. To set focus on the control for textboxes
document.getElementById("TextBoxId").focus;
toFixed(digitCount)
toString()
while (condition) {}

9. To create a single line comment in JavaScript
Two forward slashes "//"
confirm("Message Text Here")
getTime()
document.getElementById("TextBoxId").value;

10. Number object method used to return a numerical string with the specified number of significant digits
Math.max(var1, var2, varN)
sensitive
document.write("Text Here") //Remains on current line
toPrecision(precision)

11. To create a function that returns a value in JavaScript
var functionName = function(param1, param2, paramN) {}
document.getElementById("ButtonId").onclick = functionName;
concat(var1, var2, varN)
document.getElementById("listId").value;

12. A _______ variable can be changed and accessed from within and without a function or object.
confirm("Message Text Here")
<script type="text/javascript">.....</script>
global
toLowerCase()

13. The two methods common to most controls: ______ //Brings focus to the control blur //Removes focus from the control
document.getElementById("spanId").firstChild;
window.onload = function() {//actions here}
focus
<script type="text/javascript">.....</script>

14. To access the text element in a <span> tag
document.getElementById("spanId").firstChild;
getTime()
substring(startIndex)
document.writeln("Text Here") //Advances to new line after text

15. To code an If statement in JavaScript
confirm("Message Text Here")
toPrecision(precision)
Underscores
if (condition) {}

16. To make the browser load a new page using JavaScript
document.getElementById(id)
setMilliseconds()
window.location()
window.location = "New Web Address Here";

17. To write text to the current element of the DOM
document.write("Text Here") //Remains on current line
concat(var1, var2, varN)
t
Math.abs(number)

18. Math object method used to return the highest value from a set of supplied numbers
Math.ceil(number)
string
Math.max(var1, var2, varN)
Math.sqrt(number)

19. String object method used to return the position of the first instance of a specified search string starting from the specified index
indexOf(searchValue, startPosition)
document.getElementById("listId").value;
isNaN(varHere) //Returns true or false.
Objects

20. To alter the value of the text element in a span tag
toUpperCase()
isNaN(varHere) //Returns true or false.
document.getElementById("radioButtonId").value;
document.getElementById("spanId").firstChild.nodeValue = "New Value";

21. The escape sequence used to insert a Unicode character into a string in JavaScript
alert("Alert Text Here")
udddd
document.getElementById("TextBoxId").focus;
ondblclick

22. The four attributes of the <script> tag:Type - Src - _____ and Defer
Charset
f
window.location()
var variableName;

23. The string escape sequence to insert a form feed in JavaScript
event handler .
f
charAt(position)
ondblclick

24. To create a function in JavaScript
var functionName = function(param1, param2, paramN) {}
Number.NEGATIVE_INFINITY
Math.random() //Returns a value >= 0.0 but <1.0
document.writeln("Text Here") //Advances to new line after text

25. Math object method used to return the lowest value for a set of supplied numbers
standard equality operators
Math.floor(number)
substring(startIndex)
Math.min(var1, var2, varN)

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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

27. To denote a string in JavaScript
Either single or double quotes surrounding the data
toExponential(digits)
Math.min(var1, var2, varN)
Number.NEGATIVE_INFINITY

28. The _____ attribute is used to denote external file for script use
document.getElementById("listId").value;
udddd
Src - e.g. <script src="fileName.js"> //
n

29. To get the current value for textboxes
confirm()
toString()
Math.round(number)
document.getElementById("TextBoxId").value;

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
document.getElementById("spanId").firstChild.nodeValue = "New Value";
var stringVar = prompt("Text Here")
substring(startIndex, stopIndex)
expression

31. This returns only True or false values
confirm()
Underscores
t
var dateObject = new Date("11/22/2012 18:25:35")

32. The string escape sequence to start a new line in JavaScript
toPrecision(precision)
n
getTime()
document.writeln("Text Here") //Advances to new line after text

33. To access a page element by id
document.getElementById(id)
document.getElementById("TextBoxId").value;
toPrecision(precision)
substring(startIndex, stopIndex)

34. The identity operator for equals
expression
(Condition_Expression) ? Value_If_True : Value_If_False;
document.writeln("Text Here") //Advances to new line after text
===

35. The valid characters for an identifier in JavaScript: Letters - Numbers - ________ and Dollar Signs
Underscores
setMilliseconds()
document.getElementById("CheckboxId").checked = true; //Could also be false
toFixed(digitCount)

36. The format to create a new Date object from a string
document.getElementById("checkboxId").checked;
"
Underscores
var dateObject = new Date("11/22/2012 18:25:35")

37. To create a Date object in JavaScript
var dateVar = new Date()
Math.max(var1, var2, varN)
toUpperCase()
document.getElementById("spanId").firstChild.nodeValue = "New Value";

38. To assign a default value to a prompt
t
document.getElementById("ButtonId").onclick = functionName;
Use the second parameter. Example: prompt("Enter Age:", "18")
confirm()

39. To get the current checked status of the control for radio buttons
<noscript>
toFixed(digitCount)
semicolon ";"
document.getElementById("radioButtonId").checked;

40. The string escape sequence to insert a carriage return in JavaScript
expression
charAt(position)
r
document.getElementById("listId").value;

41. A list-like construct that has properties which corresponds to JavaScript values or variables or other objects.
window.onload = function() {//actions here}
Objects
Math.random() //Returns a value >= 0.0 but <1.0
document.getElementById("spanId").firstChild.nodeValue = "New Value";

42. To set the digit precision of a decimal number
===
global
toFixed(digitCount)
document.getElementById("checkboxId").value;

43. JavaScript is case _______
Underscores
Either single or double quotes surrounding the data
getFullYear()
sensitive

44. A function that is called with a certain event occurs - e.g. button.onclick and window.onload.
document.getElementById(id)
event handler .
toExponential(digits)
window.onload = function() {//actions here}

45. To test that a variable contains a valid number
Math.pow(number, power)
Math.abs(number)
var stringVar = prompt("Text Here")
isNaN(varHere) //Returns true or false.

46. To assign the value from a prompt to a non-string variable
sensitive
===
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
var stringVar = "part 1:" + "part 2";

47. To code a for statement in JavaScript
document.getElementById("TextBoxId").focus;
for (counter; condition; incrementor) {}
sensitive
document.getElementById("checkboxId").checked;

48. Math object method used to return a random number
standard equality operators
Math.random() //Returns a value >= 0.0 but <1.0
event handler .
toString(base)

49. The string escape sequence to insert a double quote in JavaScript
Objects
"
===
Math.sqrt(number)

50. When you __________ a javascript variable it retains its original value
var stringVar = "part 1:" + "part 2";
redeclare
if (condition) {}
var variableName;