Term
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Definition
| a dialog box generated by JavaScript that displays a text message with an OK button, which a user clicks to close the dialog box |
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Term
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Definition
| declared, not initialized, in a function's parenthesis. It is initialized when the function is called just by including a value with the function call, inside the function's parenthesis. |
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Term
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Definition
| signle line that indicates an action for the browser to take and ends with a semicolon |
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Term
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Definition
| a value that indicates the truth or falsity of a statement |
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Term
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Definition
| What JavaScript is; must use correct characters |
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Term
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Definition
- programs run on each user's computer
- scripts are processed and executed by the web browser on the client's machine
- scripts are embedded in the HTML document or stored in an external file
- frees server from processing |
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Term
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Definition
- may be added as a single line
// single comment
- may be added after JavaScript statements
document.write // comment
- may be written over multiple lines
/* this is text
isn't it cool
studying for a test
*/ |
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Term
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Definition
| a language in which the program code must be submitted to a compiler that manipulates it, translating the code into a more basic language that machines can understand |
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Term
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Definition
| the type of information stored in a varaible |
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Term
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Definition
| the process of searching code to locate a source of trouble |
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Term
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Definition
| the process of telling the JavaScript interpreter to reserve memory space for a variable |
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Term
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Definition
| a collection of commands that perform an action or return a value |
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Term
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Definition
| text that identifies a function |
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Term
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Definition
a variable with a global scope
- variables not declared within functions |
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Term
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Definition
| a language in which the program code is executed directly without compiling |
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Term
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Definition
| a subscript of Java, meant to be easy for nonprogrammers to use |
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Term
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Definition
| a slightly different version of JavaScript, supported by Internet Explorer |
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Term
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Definition
| an error that occurs when a script is first loaded by the browser |
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Term
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Definition
a variable with local scope
- can be referenced only within that function |
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Term
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Definition
| an error that doesn't involve syntax and structural mistakes, but results in incorrect results |
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Term
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Definition
| a process by which JavaScript manipulates or acts upon the properties of an object; object; an action that an object performs |
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Term
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Definition
| code that entails breaking up a program's different tasks into smaller, more manageable chunks |
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Term
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Definition
| indicates that no value has yet been assigned to the variable |
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Term
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Definition
| any number, such as 13, 22.5, or -3.14159 |
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Term
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Definition
| any item from the browser window itself to a document displayed in the browser to an element displayed within the document. |
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Term
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Definition
| a variable associated with a function |
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Term
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Definition
| error that occurs after a script has been successfully loaded and is being executed; occurs when the browser cannot complete a line of code |
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Term
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Definition
| a property of a variable that indicates where you can reference the variable within the web page |
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Term
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Definition
- programs are placed on the server that hosts a web site
- scripts are processed and executed by the web server
- can be problematic, overload |
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Term
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Definition
| a single line that indicates an action for the browser to take |
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Term
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Definition
| a language that forces the programming to explicitly identify a variable's data type |
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Term
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Definition
| any group of characters, such as "happy holidays" or "hello" or "421 Sunrise lane" |
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Term
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Definition
| a named item in a program that stores information |
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Term
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Definition
| a lanaguage in which variables are not strictly tied to specific data types; JavaScript is an example |
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Term
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Definition
an operator that assigns a value to an item
used when assigning values to items within a JavaScript statement |
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Term
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Definition
| an operator that performs a simple mathematical calculation on two operands in an expression; also known as a arithmetic operator |
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Term
Comparison (relational) operator
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Definition
| an operator that compares the value of one expression to another |
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Term
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Definition
| a ternary operator that tests whether a certain condition is true and returns one value if the condition is true and a different value if the condition is not true |
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Term
(condition) ? trueValue : falseValue
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Term
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Definition
a method you can use to retrieve information from a date object or to change a date object's value
used with the variable names that store Date object information |
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Term
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Definition
| an object that contains information about a specified date and time |
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Term
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Definition
| the unary operator that decreases the operand's value by 1, indicated by the - symbol |
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Term
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Definition
| an action that occurs within a web browser or web document; an action undertaken by the user or the browser that impacts the object in some way |
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Term
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Definition
| a statement that tells browsers what code to run in response to a specified event |
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Term
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Definition
| the unary operator that increaes the value of the operand by 1, indicated by the ++ symbol |
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Term
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Definition
| an operator that allows you to connect two or more Boolean expressions |
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Term
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Definition
| a method that stores functions for performing advanced calculations and mathematical operatiosn such as generating random numbers, extracting square roots, and calculating trigonometric values |
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Term
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Definition
| an object that can be used for performing mathematical operatiosn and storing mathematical values |
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Term
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Definition
| the unary operator that changes the sign of (or negates) an item's value |
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Term
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Definition
| the variable or expression that operators act upon |
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Term
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Definition
| a symbol used to act upon an item or a variable within a JavaScript expression |
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Term
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Definition
parentheses: ()
multiply: *, division: /, and modulo/remainder: %
addition: +, subtraction: - |
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Term
Time-delayed command - setTimeout()
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Definition
| a command that is run after a specified amount of time has passed |
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Term
Time-interval command – setInterval()
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Definition
| a command that instructs the browser to run the same command repeatedly at specified intervals |
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Term
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Definition
| an operator that works on only one operand; can make code more compact and efficient |
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Term
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Definition
| may be embedded in head element or the body element of a web page |
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Term
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Definition
| an operator that performs a simple mathematical calculation on two operands in an expression; also known as a binary operator |
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Term
| code for assigning values variables |
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Definition
var firstname;
firstname = "bobby";
var lastname = "bearcat"; |
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Term
| code for writing functions |
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Definition
function name(parameters)
{
commands
return value;
} |
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Term
| code for calling functions |
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Definition
[script type = "text/javascript"]
functionName();
[/script]
* this is after declaration in head code |
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Term
| code for using external .js files |
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Definition
[script src = "demo.js" type = "text/javascript"]
[/script] |
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Term
code for using Math methods such as
Math.ceil(x) |
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Definition
| returns x rounded up to the next highest integer |
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Term
code for using math methods such as:
Math.floor(x) |
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Definition
| returns x rounded down to the next lowest integer |
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Term
code for using math methods such as:
Math.max(x,y) |
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Definition
| returns the larger value x or y |
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Term
code for using math methods such as:
Math.min(x.y) |
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Definition
| returns the smaller of x and y |
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Term
code for using math methods such as:
Math.pow(x,y) |
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Definition
| returns x raised to the y |
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Term
code for using math methods such as:
Math.random() |
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Definition
| returns a random number between 0 and 1 |
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Term
code for using math methods such as:
Math.round(x) |
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Definition
| returns x rounded to the nearest integer |
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Term
| code for referencing objects |
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Definition
| object.property = expression; |
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Term
code for using event handlers such as:
onload |
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Definition
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Term
code for using event handlers such as
onmouseover |
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Definition
| when mouse is moved - code is activated |
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Term
code for using event handlers such as:
onclick |
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Definition
| object is clicked with mouse button |
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Term
| code for using Data objects and methods |
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Definition
var variable = new Date("month day, year hours:minutes:seconds");
var currentDate = new Date();
variableName.dateObjectMethod(); |
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Term
code for using numeric functions and methods such as:
isFinite(value) |
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Definition
| returns a boolean value indicating whether value is finite and a legal number |
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Term
code for using numerical functions and methods such as:
isNaN(value) |
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Definition
| returns a boolean value, which has the value true if value isn't a number |
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Term
code for using numeric functions and methods such as:
parseFloat(string) |
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Definition
| extracts the first numeric value from a string |
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Term
code for using numeric functions and methods such as:
parseInt(string) |
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Definition
| extracts the first integer value from a text string |
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Term
code for numeric functions and methods such as:
value.toExponential(n) |
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Definition
| returns a text string displaying value in exponential notation with n digits to the right of the decimal point |
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Term
code for numeric functions and methods such as:
value.toFixed(n) |
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Definition
| returns a text string displaying value to n decimal places |
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Term
code for numeric functions and methods such as:
value.toPrecision(n) |
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Definition
| returns a text string displaying value to n significant digits either to the left or to the right of the decimal point |
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Term
code for evaluating expressions using:
arithmetic operators ( + - * / %) |
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Definition
sum = 4 + 5
answer = 4 * 9 / 6 + 2 - 1 * 3
question = 45 % 6
dif = 6 - 3
quo = 4 / 2
mult = 6 * 9 |
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Term
code for evaluating expressions using:
increment operator ( x++ ++x) |
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Definition
requires one operand
adds 1 to single operand
operand may be number |
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Term
code for evaluating expressions using:
decrement operator ( x-- --x) |
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Definition
requires one operand
subtracts 1 to single operand
operand may be number |
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Term
code for evaluating expressions using:
- assignment operators ( = += -= *= /= %= )
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Definition
used when assigning values to items within a JavaScript Statement
x = x + y;
x += y;
x++
y-- |
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Term
code for evaluating expressions using:
conditional operator
(condition) ? trueValue : falseValue |
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Definition
tests whether a certain condition is true or not
thisHour = (thisHour == 0) ? 12: thisHour; |
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Term
code evaluating expressions using:
comparison or relational operators
( == != < <= < <= ) |
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Definition
compares two expressions or variables and returns a Boolean value as a result
a = 3
d = 4
c = 10
d + 1 > 5
c % a < 2
c != 2
a <= d
c - 6 >= d |
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Term
code evaaluating expressions using:
logical operators ( ! && || ) |
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Definition
(x == 20) && (y==25)
(x == 20) || (y<10)
!(x = 20) |
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