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. Number object method used to return a string with a given number base
toString(base)
document.getElementById(id)
setMilliseconds()
focus

2. The string escape sequence to insert a double quote in JavaScript
"
setMilliseconds()
toTimeString()
var answerVar = confirm("Message Text Here")

3. To access the text element in a <span> tag
var functionName = function(param1, param2, paramN) {}
document.getElementById("spanId").firstChild;
isNaN(varHere) //Returns true or false.
toUpperCase()

4. Number object method used to round numbers to the specified number of decimal places
Math.min(var1, var2, varN)
toFixed(digits)
"
window.onload = function() {//actions here}

5. When you add a string and a number the result will be a ____
document.writeln("Text Here") //Advances to new line after text
string
Math.sqrt(number)
document.getElementById("spanId").firstChild.nodeValue = "New Value";

6. To get the text value of the control for radio buttons
event handler .
f
document.getElementById("checkboxId").value;
var answerVar = confirm("Message Text Here")

7. Math object method used to return a given number that has been rounded to the closes integer value
Math.round(number)
toLowerCase()
getTime()
Underscores

8. Math object method used to return a random number
document.getElementById("listId").value;
isNaN(varHere) //Returns true or false.
document.getElementById(id)
Math.random() //Returns a value >= 0.0 but <1.0

9. To create a Date object in JavaScript
confirm()
getTime()
var dateVar = new Date()
global

10. To get the current checked status of the control for radio buttons
var answerVar = confirm("Message Text Here")
document.getElementById("CheckboxId").checked = true; //Could also be false
document.getElementById("radioButtonId").checked;
Math.random() //Returns a value >= 0.0 but <1.0

11. To get the current checked status of the control for checkboxes
'
document.getElementById("checkboxId").checked;
semicolon ";"
toString(base)

12. To test that a variable contains a valid number
t
toString()
isNaN(varHere) //Returns true or false.
\

13. To create a new Date object
(Condition_Expression) ? Value_If_True : Value_If_False;
n
charAt(position)
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)

14. A function that is called with a certain event occurs - e.g. button.onclick and window.onload.
string
f
ondblclick
event handler .

15. A statement that yields a value
expression
document.getElementById("TextBoxId").disabled = true;
'
toString()

16. To get the current value for textboxes
Src - e.g. <script src="fileName.js"> //
toLowerCase()
Use the second parameter. Example: prompt("Enter Age:", "18")
document.getElementById("TextBoxId").value;

17. To set the control to be disabled for textboxes
ondblclick
Math.ceil(number)
document.getElementById("TextBoxId").disabled = true;
Src - e.g. <script src="fileName.js"> //

18. When you __________ a javascript variable it retains its original value
toString()
redeclare
document.getElementById("radioButtonId").checked;
focus

19. ________ comments start with / and end with /.
Multi line
toString()
var dateObject = new Date("11/22/2012 18:25:35")
document.getElementById("ButtonId").onclick = functionName;

20. To denote a string in JavaScript
<noscript>
Either single or double quotes surrounding the data
window.location()
Use the second parameter. Example: prompt("Enter Age:", "18")

21. To code a while statement in JavaScript
while (condition) {}
Use the second parameter. Example: prompt("Enter Age:", "18")
window.location()
Multi line

22. Math object method used to return the square root of a given number
document.getElementById("CheckboxId").checked = true; //Could also be false
document.getElementById("radioButtonId").checked = true; //Could also be false
Math.sqrt(number)
var answerVar = confirm("Message Text Here")

23. The identity operator for equals
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
focus
toString(base)
===

24. To get the current value of the control for a text area
document.getElementById("textAreaId").value;
Either single or double quotes surrounding the data
charAt(position)
var variableName;

25. To assign the return value of confirm() to a variable
Math.abs(number)
var answerVar = confirm("Message Text Here")
var stringVar = prompt("Text Here")
var functionName = function(param1, param2, paramN) {}

26. What String object method returns a new string containing the value of the original string but in all lower case
substring(startIndex, stopIndex)
t
toLowerCase()
var variableName;

27. What Date object method is used to return the number of milliseconds since the start of GMT
ondblclick
standard equality operators
document.getElementById("spanId").firstChild.nodeValue = "New Value";
getTime()

28. To set the digit precision of a decimal number
setMilliseconds()
Math.floor(number)
var arrayVar = new Array()
toFixed(digitCount)

29. This returns only True or false values
confirm()
global
ondblclick
document.getElementById("textAreaId").value = "Text Value";

30. To declare a variable in JavaScript
var variableName;
document.getElementById(id)
Two forward slashes "//"
document.getElementById("textAreaId").value;

31. To display an alert
'
var variableName;
alert("Alert Text Here")
Math.pow(number, power)

32. Math object method used to return the absolute value of a given number
document.write("Text Here") //Remains on current line
Math.abs(number)
Charset
concat(var1, var2, varN)

33. To get the value or the currently selected item for lists
var dateObject = new Date(year, month, day, hours, minutes, seconds, milliseconds)
t
document.getElementById("listId").value;
Math.min(var1, var2, varN)

34. Command to display a prompt
prompt("Text Here")
document.getElementById("checkboxId").value;
t
var dateObject = new Date("11/22/2012 18:25:35")

35. The two methods common to most controls: ______ //Brings focus to the control blur //Removes focus from the control
document.getElementById("radioButtonId").checked;
focus
document.write("Text Here") //Remains on current line
for (counter; condition; incrementor) {}

36. 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
Math.round(number)
substring(startIndex, stopIndex)
document.getElementById("CheckboxId").checked = true; //Could also be false
for (counter; condition; incrementor) {}

37. To set the current value of the control for a text area
document.getElementById("radioButtonId").value;
document.getElementById("ButtonId").onclick = functionName;
document.getElementById("textAreaId").value = "Text Value";
document.getElementById("checkboxId").checked;

38. Math object method used to return a given number rounded to the next lowest integer value
Number.NEGATIVE_INFINITY
'
Math.floor(number)
var arrayVar = new Array()

39. The string escape sequence to insert a vertical tab in JavaScript
toExponential(digits)
Use the second parameter. Example: prompt("Enter Age:", "18")
v
substring(startIndex, stopIndex)

40. To create a function that returns a value in JavaScript
document.getElementById("listId").value;
focus
var functionName = function(param1, param2, paramN) {}
document.getElementById("textAreaId").value;

41. To assign actions to the window onLoad event
document.getElementById(id)
toUpperCase()
document.getElementById("TextBoxId").focus;
window.onload = function() {//actions here}

42. The available properties for the Number object: Number.MAX_VALUE - Number.MIN_VALUE - Number.POSITIVE_INFINITY - _______ - Number.NaN
var variableName;
Two forward slashes "//"
document.getElementById("TextBoxId").disabled = true;
Number.NEGATIVE_INFINITY

43. To write text to the current element of the DOM
alert("Alert Text Here")
Either single or double quotes surrounding the data
document.write("Text Here") //Remains on current line
var variableName;

44. The _____ attribute is used to denote external file for script use
semicolon ";"
Src - e.g. <script src="fileName.js"> //
document.getElementById("spanId").firstChild.nodeValue = "New Value";
document.getElementById("textAreaId").value;

45. String object method used to return a new string that contains part of the original string from the specified start position
redeclare
substring(startIndex)
for (counter; condition; incrementor) {}
toUpperCase()

46. Number object method used to return a numerical string with the specified number of significant digits
toString()
toPrecision(precision)
redeclare
Either single or double quotes surrounding the data

47. The valid characters for an identifier in JavaScript: Letters - Numbers - ________ and Dollar Signs
Math.max(var1, var2, varN)
if (condition) {}
Underscores
v

48. To set the current checked status of the control for checkboxes
document.getElementById("CheckboxId").checked = true; //Could also be false
document.getElementById(id)
toFixed(digitCount)
window.location = "New Web Address Here";

49. To access a page element by id
t
Multi line
isNaN(varHere) //Returns true or false.
document.getElementById(id)

50. The escape sequence used to insert a Unicode character into a string in JavaScript
var dateVar = new Date()
var stringVar = "part 1:" + "part 2";
ondblclick
udddd