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 alter the value of the text element in a span tag
document.getElementById("TextBoxId").value;
Use a parse. Example : var intVar = parseInt(prompt("Text Here"))
document.getElementById("spanId").firstChild.nodeValue = "New Value";
var dateObject = new Date("11/22/2012 18:25:35")

2. Math object method used to return a given number raised to a given power
document.getElementById("TextBoxId").disabled = true;
document.writeln("Text Here") //Advances to new line after text
document.getElementById("textAreaId").value = "Text Value";
Math.pow(number, power)

3. To create a Date object in JavaScript
<noscript>
document.getElementById(id)
var dateVar = new Date()
document.write("Text Here") //Remains on current line

4. The string escape sequence to insert a carriage return in JavaScript
document.getElementById("textAreaId").value = "Text Value";
expression
r
\

5. Math object method used to return a given number rounded to the next highest integer value
Math.ceil(number)
Objects
(Condition_Expression) ? Value_If_True : Value_If_False;
document.getElementById("ButtonId").onclick = functionName;

6. To code a button.onclick event handler
Objects
document.getElementById("ButtonId").onclick = functionName;
focus
document.getElementById("TextBoxId").value;

7. To access the text element in a <span> tag
Number.NEGATIVE_INFINITY
document.getElementById("spanId").firstChild;
toLowerCase()
Underscores

8. To access a page element by id
\
(Condition_Expression) ? Value_If_True : Value_If_False;
document.getElementById(id)
Objects

9. The available get methods for a Date object: getTime() - _________ - getMonth() - getDate() - getHours() - getMinutes() - getSeconds() - getMilliseconds()
document.getElementById("textAreaId").value;
string
getFullYear()
Multi line

10. To create a single line comment in JavaScript
toExponential(digits)
f
Two forward slashes "//"
ondblclick

11. Math object method used to return the highest value from a set of supplied numbers
Use the second parameter. Example: prompt("Enter Age:", "18")
Math.max(var1, var2, varN)
redeclare
document.writeln("Text Here") //Advances to new line after text

12. Date object method used to return a string containing the date
concat(var1, var2, varN)
toDateString()
Math.pow(number, power)
Use the second parameter. Example: prompt("Enter Age:", "18")

13. Number object method used to return a numerical string with the specified number of significant digits
Multi line
setMilliseconds()
Math.round(number)
toPrecision(precision)

14. Number object method used to return a number in exponential format with the specified number of decimal places
sensitive
indexOf(searchValue, startPosition)
toExponential(digits)
document.getElementById("spanId").firstChild.nodeValue = "New Value";

15. Math object method used to return a given number that has been rounded to the closes integer value
document.getElementById("radioButtonId").value;
Math.abs(number)
Math.round(number)
document.getElementById("TextBoxId").value;

16. Date object method used to return a string containing the time
window.location()
toTimeString()
semicolon ";"
document.getElementById(id)

17. Date object method used to return a string containing the date and time
toString()
var stringVar = prompt("Text Here")
Src - e.g. <script src="fileName.js"> //
var stringVar = "part 1:" + "part 2";

18. To concatenate multiple parts into a string
t
!==
var stringVar = "part 1:" + "part 2";
event handler .

19. The string escape sequence to insert a tab in JavaScript
document.getElementById("checkboxId").value;
t
toString()
window.location()

20. To set the control to be disabled for textboxes
document.getElementById("TextBoxId").disabled = true;
confirm()
document.write("Text Here") //Remains on current line
var variableName;

21. To test that a variable contains a valid number
isNaN(varHere) //Returns true or false.
getFullYear()
prompt("Text Here")
Math.floor(number)

22. To view the current web address using JavaScript
document.getElementById("TextBoxId").focus;
Either single or double quotes surrounding the data
window.location()
Math.abs(number)

23. To display a confirmation
redeclare
substring(startIndex)
focus
confirm("Message Text Here")

24. The string escape sequence to insert a backslash in JavaScript
Math.abs(number)
\
document.getElementById("TextBoxId").focus;
var answerVar = confirm("Message Text Here")

25. The syntax of a conditional operator
toDateString()
(Condition_Expression) ? Value_If_True : Value_If_False;
r
document.getElementById(id)

26. To display an alert
window.location()
document.getElementById("radioButtonId").value;
alert("Alert Text Here")
concat(var1, var2, varN)

27. To set the current value of the control for a text area
\
!==
document.getElementById("textAreaId").value = "Text Value";
Objects

28. The string escape sequence to insert a vertical tab in JavaScript
v
getTime()
global
document.getElementById("CheckboxId").checked = true; //Could also be false

29. To create an Array object in JavaScript
var arrayVar = new Array()
document.getElementById("TextBoxId").value;
toUpperCase()
t

30. The string escape sequence to insert a double quote in JavaScript
string
toFixed(digits)
document.getElementById("checkboxId").value;
"

31. Math object method used to return a random number
var functionName = function(param1, param2, paramN) {}
<script type="text/javascript">.....</script>
setMilliseconds()
Math.random() //Returns a value >= 0.0 but <1.0

32. To make the browser load a new page using JavaScript
toPrecision(precision)
toFixed(digitCount)
Math.round(number)
window.location = "New Web Address Here";

33. ________ comments start with / and end with /.
charAt(position)
Multi line
document.getElementById("radioButtonId").checked = true; //Could also be false
global

34. To get the text value of the control for radio buttons
Two forward slashes "//"
<noscript>
document.getElementById("checkboxId").value;
document.writeln("Text Here") //Advances to new line after text

35. The escape sequence used to insert a Unicode character into a string in JavaScript
toPrecision(precision)
udddd
toLowerCase()
document.getElementById("checkboxId").value;

36. To write a line to the current element of the DOM (Document Object Model)
document.getElementById("spanId").firstChild.nodeValue = "New Value";
document.getElementById("CheckboxId").checked = true; //Could also be false
window.onload = function() {//actions here}
document.writeln("Text Here") //Advances to new line after text

37. Command to display a prompt
toLowerCase()
prompt("Text Here")
Src - e.g. <script src="fileName.js"> //
for (counter; condition; incrementor) {}

38. To get the value or the currently selected item for lists
document.getElementById("listId").value;
Charset
redeclare
toFixed(digitCount)

39. The identity operator for equals
Charset
===
var functionName = function(param1, param2, paramN) {}
semicolon ";"

40. Unlike ________________ identity operators do not perform type coercion.
getFullYear()
document.getElementById("ButtonId").onclick = functionName;
standard equality operators
if (condition) {}

41. To get the current value of the control for a text area
ondblclick
r
document.getElementById("textAreaId").value;
Math.max(var1, var2, varN)

42. To set the digit precision of a decimal number
global
toFixed(digitCount)
document.getElementById("spanId").firstChild.nodeValue = "New Value";
Math.max(var1, var2, varN)

43. To get the current checked status of the control for radio buttons
document.getElementById("radioButtonId").checked;
global
document.getElementById("textAreaId").value;
r

44. 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)
standard equality operators
window.location = "New Web Address Here";
"

45. Math object method used to return the square root of a given number
var functionName = function(param1, param2, paramN) {}
Math.sqrt(number)
document.getElementById(id)
r

46. The four attributes of the <script> tag:Type - Src - _____ and Defer
var answerVar = confirm("Message Text Here")
Math.abs(number)
udddd
Charset

47. To get the current value for textboxes
substring(startIndex, stopIndex)
===
document.getElementById("TextBoxId").value;
ondblclick

48. To get the current checked status of the control for checkboxes
toString()
var stringVar = prompt("Text Here")
Math.random() //Returns a value >= 0.0 but <1.0
document.getElementById("checkboxId").checked;

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

50. When you add a string and a number the result will be a ____
string
Math.ceil(number)
Math.max(var1, var2, varN)
Multi line