Javascript

Front 1

What is the command to display a prompt?

Back 1

prompt("Text Here");

Front 2

How do you assign the value from a prompt to a string?

Back 2

var stringVar = prompt("Text Here");

Front 3

How do you assign the value from a prompt to a non-string variable?

Back 3

Using a parse. Example : var intVar = parseInt(prompt("Text Here"));

Front 4

How do you assign a default value to a prompt?

Back 4

Using the second parameter. Example: prompt("Enter Age:"

Front 5

How do you display an alert?

Back 5

alert("Alert Text Here");

Front 6

How do you test that a variable contains a valid number?

Back 6

isNaN(varHere); //Returns true or false.

Front 7

How do you display a confirmation?

Back 7

confirm("Message Text Here");

Front 8

What values can confirm() return?

Back 8

True or false

Front 9

How do you assign the return value of confirm() to a variable?

Back 9

var answerVar = confirm("Message Text Here");

Front 10

How do you access a page element by id?

Back 10

document.getElementById(id);

Front 11

How do you assign actions to the window onLoad event?

Back 11

window.onload = function() {//actions here}

Front 12

What are the four attributes of the <script> tag?

Back 12

Type

Front 13

In the <script> tag

Back 13

how is the Type attribute used?

Front 14

In the <script> tag

Back 14

how is the Src attribute used?

Front 15

In the <script> tag

Back 15

how is the Defer attribute used?

Front 16

What is the <noscript> tag used for?

Back 16

The text between the opening and closing tag is displayed if JavaScript is disabled or otherwise not available

Front 17

How do you write a line to the current element of the DOM?

Back 17

document.writeln("Text Here"); //Advances to new line after text

Front 18

What is the DOM?

Back 18

Document Object Model

Front 19

What is AJAX?

Back 19

Asynchronous JavaScript And XML

Front 20

Is JavaScript case sensitive?

Back 20

Yes

Front 21

How do statements end in JavaScript?

Back 21

With a semicolon ";"

Front 22

How do you create a single line comment in JavaScript?

Back 22

With two forward slashes "//"

Front 23

How do you create a multi-line comment in JavaScript?

Back 23

Start with a forward slash and asterisk

Front 24

What are the valid characters for an identifier in JavaScript?

Back 24

Letters

Front 25

How do you denote a string in JavaScript

Back 25

With either single or double quotes surrounding the data

Front 26

What is the string escape sequence to start a new line in JavaScript?

Back 26

\n

Front 27

How do you declare a variable in JavaScript?

Back 27

var variableName;

Front 28

How do you create a Date object in JavaScript?

Back 28

var dateVar = new Date();

Front 29

How do you create an Array object in JavaScript?

Back 29

var arrayVar = new Array();

Front 30

How do you view the current web address using JavaScript?

Back 30

window.location();

Front 31

How do you make the browser load a new page using JavaScript?

Back 31

window.location = "New Web Address Here";

Front 32

How do you write text to the current element of the DOM?

Back 32

document.write("Text Here"); //Remains on current line

Front 33

What method allows you to set the digit precision of a decimal number?

Back 33

toFixed(digitCount);

Front 34

For textboxes

Back 34

How do you get the current value?

Front 35

For textboxes

Back 35

How do you set the control to be disabled?

Front 36

For textboxes

Back 36

how do you set focus on the control?

Front 37

How do you code an If statement in JavaScript?

Back 37

if (condition) {}

Front 38

How do you code an If Else statement in JavaScript?

Back 38

if (condition){

Front 39

How do you code an If Else If statement in JavaScript?

Back 39

if (condition) {

Front 40

How do you code a while statement in JavaScript?

Back 40

while (condition) {}

Front 41

How do you code a for statement in JavaScript?

Back 41

for (counter; condition; incrementor) {}

Front 42

How do you create a function in JavaScript?

Back 42

var functionName = function(param1

Front 43

How do you create a function that returns a value in JavaScript?

Back 43

var functionName = function(param1

Front 44

What is an event handler?

Back 44

A function that is called with a certain event occurs. Examples of these include button.onclick and window.onload.

Front 45

How do you code a button.onclick event handler?

Back 45

document.getElementById("ButtonId").onclick = functionName;

Front 46

For radio buttons

Back 46

how do you get the text value of the control?

Front 47

For radio buttons

Back 47

how do you get the current checked status of the control?

Front 48

For checkboxes

Back 48

how do you get the text value of the control?

Front 49

For checkboxes

Back 49

how do you get the current checked status of the control?

Front 50

For lists

Back 50

how do you get the value or the currently selected item?

Front 51

For a text area

Back 51

how do you get the current value of the control?

Front 52

For a text area

Back 52

how do you get the current character count for the control?

Front 53

What are the two methods common to most controls?

Back 53

focus //Brings focus to the control

Front 54

What are the events common to most controls?

Back 54

onfocus //Fired when control receives focus

Front 55

How do you concatenate multiple parts into a string?

Back 55

var stringVar = "part 1:" + "part 2";

Front 56

How do you access the text element in a <span> tag?

Back 56

document.getElementById("spanId").firstChild;

Front 57

How do you alter the value of the text element in a span tag?

Back 57

document.getElementById("spanId").firstChild.nodeValue = "New Value";

Front 58

For radio buttons

Back 58

how do you set the current checked status of the control?

Front 59

For checkboxes

Back 59

how do you set the current checked status of the control?

Front 60

For a text area

Back 60

how do you set the current value of the control?

Front 61

What are the available properties for the Number object?

Back 61

Number.MAX_VALUE

Front 62

What are the 3 shortcuts for Number object properties?

Back 62

Infinity //Represents Number.POSITIVE_INFINITY

Front 63

What Number object method is used to round numbers to the specified number of decimal places?

Back 63

toFixed(digits);

Front 64

What Number object method is used to return a string with a given number base?

Back 64

toString(base); //Bases can range from 2 to 36

Front 65

What Number object method is used to return a number in exponential format with the specified number of decimal places?

Back 65

toExponential(digits);

Front 66

What Number object method is used to return a numerical string with the specified number of significant digits?

Back 66

toPrecision(precision);

Front 67

What is the syntax of a conditional operator?

Back 67

(Condition_Expression) ? Value_If_True : Value_If_False;

Front 68

What Math object method is used to return the absolute value of a given number?

Back 68

Math.abs(number);

Front 69

What Math object method is used to return a given number that has been rounded to the closes integer value?

Back 69

Math.round(number);

Front 70

What Math object method is used to return a given number rounded to the next highest integer value?

Back 70

Math.ceil(number);

Front 71

What Math object method is used to return a given number rounded to the next lowest integer value?

Back 71

Math.floor(number);

Front 72

What Math object method is used to return a given number raised to a given power?

Back 72

Math.pow(number

Front 73

What Math object method is used to return the square root of a given number?

Back 73

Math.sqrt(number);

Front 74

What Math object method is used to return the highest value from a set of supplied numbers?

Back 74

Math.max(var1

Front 75

What Math object method is used to return the lowest value for a set of supplied numbers?

Back 75

Math.min(var1

Front 76

What Math object method is used to return a random number?

Back 76

Math.random() //Returns a value >= 0.0 but <1.0

Front 77

What is the string escape sequence to insert a tab in JavaScript?

Back 77

\t

Front 78

What is the string escape sequence to insert a carriage return in JavaScript?

Back 78

\r

Front 79

What is the string escape sequence to insert a form feed in JavaScript?

Back 79

\f

Front 80

What is the string escape sequence to insert a vertical tab in JavaScript?

Back 80

\v

Front 81

What is the string escape sequence to insert a double quote in JavaScript?

Back 81

\"

Front 82

What is the string escape sequence to insert a single quote in JavaScript?

Back 82

\'

Front 83

What is the string escape sequence to insert a backslash in JavaScript?

Back 83

\\

Front 84

What is the escape sequence used to insert a Unicode character into a string in JavaScript?

Back 84

\udddd //"dddd" is replaced by the hexadecimal value for the Unicode character

Front 85

What String object method is used to get the character at a specified index position?

Back 85

charAt(position);

Front 86

What String object method is used to concatenate multiple strings?

Back 86

concat(var1

Front 87

What String object method is used return the position of the first instance of a specified search string

Back 87

starting from the specified index?

Front 88

What String object method is used to return a new string that contains part of the original string from the specified start position?

Back 88

substring(startIndex);

Front 89

What String object method is 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?

Back 89

substring(startIndex

Front 90

What String object method returns a new string containing the value of the original string but in all upper case?

Back 90

toUpperCase();

Front 91

What String object method returns a new string containing the value of the original string but in all lower case?

Back 91

toLowerCase();

Front 92

How do you create a new Date object?

Back 92

var dateObject = new Date(year

Front 93

What is the format to create a new Date object from a string?

Back 93

var dateObject = new Date("11/22/2012 18:25:35");

Front 94

What Date object method is used to return the number of milliseconds since the start of GMT?

Back 94

getTime();

Front 95

What are the available get methods for a Date object?

Back 95

getTime();

Front 96

getMonth(); //Returns months

Back 96

starts with 0 for January

Front 97

What are the available set methods for a Date object?

Back 97

setFullYear(); //Sets 4 digit year

Front 98

setMonth(); //Sets months

Back 98

starts with 0 for January

Front 99

What Date object method is used to return a string containing the date and time?

Back 99

toString();

Front 100

What Date object method is used to return a string containing the date?

Back 100

toDateString();

Front 101

What Date object method is used to return a string containing the time?

Back 101

toTimeString();

Front 102

What makes the identity operators different from the standard equality operators?

Back 102

They do not perform type coercion. //Eg. If data types don't match they fail the comparison

Front 103

What is the identity operator for equals?

Back 103

===

Front 104

What is the identity operator for not equal?

Back 104

!==

Front 105

What is the format for a switch statement in JavaScript?

Back 105

switch (inputVar) {