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 test that a variable contains a valid number
window.location()
isNaN(varHere) //Returns true or false.
toFixed(digitCount)
document.writeln("Text Here") //Advances to new line after text

2. The string escape sequence to insert a tab in JavaScript
t
document.getElementById("TextBoxId").disabled = true;
Either single or double quotes surrounding the data
redeclare

3. Command to display a prompt
prompt("Text Here")
<script type="text/javascript">.....</script>
document.getElementById("textAreaId").value = "Text Value";
document.getElementById("listId").value;

4. 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

5. The identity operator for equals
standard equality operators
Either single or double quotes surrounding the data
expression
===

6. To set the digit precision of a decimal number
confirm("Message Text Here")
v
toFixed(digitCount)
toString(base)

7. ________ comments start with / and end with /.
document.writeln("Text Here") //Advances to new line after text
toString()
Multi line
Charset

8. String object method used to concatenate multiple strings
toExponential(digits)
document.getElementById("ButtonId").onclick = functionName;
"
concat(var1, var2, varN)

9. To write text to the current element of the DOM
document.getElementById("textAreaId").value = "Text Value";
document.write("Text Here") //Remains on current line
Two forward slashes "//"
<script type="text/javascript">.....</script>

10. Date object method used to return a string containing the time
var dateVar = new Date()
toExponential(digits)
document.getElementById("spanId").firstChild.nodeValue = "New Value";
toTimeString()

11. To create a new Date object
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
window.location = "New Web Address Here";
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
document.getElementById("TextBoxId").disabled = true;

12. To assign actions to the window onLoad event
<noscript>
window.onload = function() {//actions here}
!==
<script type="text/javascript">.....</script>

13. To get the current value for textboxes
document.writeln("Text Here") //Advances to new line after text
alert("Alert Text Here")
document.getElementById("TextBoxId").value;
prompt("Text Here")

14. The available properties for the Number object: Number.MAX_VALUE - Number.MIN_VALUE - Number.POSITIVE_INFINITY - _______ - Number.NaN
Number.NEGATIVE_INFINITY
while (condition) {}
indexOf(searchValue, startPosition)
Math.pow(number, power)

15. Number object method used to return a number in exponential format with the specified number of decimal places
'
toExponential(digits)
Math.min(var1, var2, varN)
Charset

16. Math object method used to return the square root of a given number
var dateObject = new Date("11/22/2012 18:25:35")
Math.pow(number, power)
r
Math.sqrt(number)

17. To insert Javascript into a web page
<script type="text/javascript">.....</script>
Math.sqrt(number)
toTimeString()
toDateString()

18. To display an alert
t
alert("Alert Text Here")
document.getElementById("TextBoxId").disabled = true;
Math.max(var1, var2, varN)

19. To create a function in JavaScript
<noscript>
var functionName = function(param1, param2, paramN) {}
toUpperCase()
toExponential(digits)

20. Number object method used to return a numerical string with the specified number of significant digits
document.getElementById("spanId").firstChild.nodeValue = "New Value";
document.getElementById("textAreaId").value = "Text Value";
toPrecision(precision)
toFixed(digits)

21. To denote a string in JavaScript
document.getElementById("checkboxId").value;
sensitive
Either single or double quotes surrounding the data
while (condition) {}

22. The available get methods for a Date object: getTime() - _________ - getMonth() - getDate() - getHours() - getMinutes() - getSeconds() - getMilliseconds()
Math.round(number)
toUpperCase()
setMilliseconds()
getFullYear()

23. To assign the return value of confirm() to a variable
===
var answerVar = confirm("Message Text Here")
document.getElementById("TextBoxId").focus;
Math.random() //Returns a value >= 0.0 but <1.0

24. To create an Array object in JavaScript
sensitive
document.getElementById("checkboxId").value;
window.location = "New Web Address Here";
var arrayVar = new Array()

25. JavaScript is case _______
sensitive
Math.max(var1, var2, varN)
Src - e.g. <script src="fileName.js"> //
!==

26. Statements end in JavaScript with a ________
Math.floor(number)
semicolon ";"
document.writeln("Text Here") //Advances to new line after text
charAt(position)

27. The format to create a new Date object from a string
var functionName = function(param1, param2, paramN) {}
event handler .
var dateObject = new Date("11/22/2012 18:25:35")
t

28. A _______ variable can be changed and accessed from within and without a function or object.
toLowerCase()
global
var functionName = function(param1, param2, paramN) {}
===

29. To assign the value from a prompt to a non-string variable
document.getElementById("spanId").firstChild.nodeValue = "New Value";
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
document.getElementById("TextBoxId").disabled = true;
Math.ceil(number)

30. To write a line to the current element of the DOM (Document Object Model)
substring(startIndex, stopIndex)
Either single or double quotes surrounding the data
document.writeln("Text Here") //Advances to new line after text
focus

31. To code a while statement in JavaScript
var functionName = function(param1, param2, paramN) {}
document.getElementById("radioButtonId").checked;
document.getElementById("textAreaId").value;
while (condition) {}

32. 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;
toExponential(digits)
sensitive

33. To get the text value of the control for radio buttons
var functionName = function(param1, param2, paramN) {}
document.getElementById("radioButtonId").value;
standard equality operators
toTimeString()

34. The events common to most controls: onfocus - onblur - onclick - _______ - onchange - onselect
document.getElementById("spanId").firstChild.nodeValue = "New Value";
ondblclick
Math.ceil(number)
Math.pow(number, power)

35. To set the control to be disabled for textboxes
toDateString()
document.getElementById("TextBoxId").disabled = true;
confirm()
toString(base)

36. To set the current checked status of the control for checkboxes
document.getElementById("checkboxId").checked;
t
Math.min(var1, var2, varN)
document.getElementById("CheckboxId").checked = true; //Could also be false

37. To get the current checked status of the control for radio buttons
Math.abs(number)
t
document.getElementById("radioButtonId").checked;
semicolon ";"

38. To declare a variable in JavaScript
var variableName;
semicolon ";"
var functionName = function(param1, param2, paramN) {}
string

39. The ________ tag is used to display the text between the opening and closing tag if JavaScript is disabled or otherwise not available
var variableName;
<noscript>
confirm()
confirm("Message Text Here")

40. String object method used to return the position of the first instance of a specified search string starting from the specified index
window.location = "New Web Address Here";
document.getElementById("TextBoxId").value;
v
indexOf(searchValue, startPosition)

41. The string escape sequence to start a new line in JavaScript
n
var functionName = function(param1, param2, paramN) {}
alert("Alert Text Here")
r

42. Math object method used to return the highest value from a set of supplied numbers
Math.max(var1, var2, varN)
document.getElementById("spanId").firstChild;
Math.min(var1, var2, varN)
Math.sqrt(number)

43. To set focus on the control for textboxes
var functionName = function(param1, param2, paramN) {}
document.getElementById("TextBoxId").focus;
document.getElementById("CheckboxId").checked = true; //Could also be false
document.writeln("Text Here") //Advances to new line after text

44. Math object method used to return the absolute value of a given number
toString(base)
Two forward slashes "//"
sensitive
Math.abs(number)

45. The string escape sequence to insert a form feed in JavaScript
v
f
Math.floor(number)
semicolon ";"

46. To make the browser load a new page using JavaScript
redeclare
window.location = "New Web Address Here";
for (counter; condition; incrementor) {}
(Condition_Expression) ? Value_If_True : Value_If_False;

47. To create a single line comment in JavaScript
Two forward slashes "//"
document.getElementById("checkboxId").checked;
Math.min(var1, var2, varN)
var stringVar = prompt("Text Here")

48. To create a function that returns a value in JavaScript
var functionName = function(param1, param2, paramN) {}
document.getElementById("TextBoxId").disabled = true;
var answerVar = confirm("Message Text Here")
document.getElementById("checkboxId").checked;

49. The syntax of a conditional operator
setMilliseconds()
var functionName = function(param1, param2, paramN) {}
Src - e.g. <script src="fileName.js"> //
(Condition_Expression) ? Value_If_True : Value_If_False;

50. Date object method used to return a string containing the date and time
expression
toString()
isNaN(varHere) //Returns true or false.
!==