JavaScript Cheat Sheet by Pyro19D

Number

Any numeric value

Boolean

True or False

Object

Any value associated with the object

x + y (numeric)

Adds x and y together

x - y

Subtracts y from x

x / y

Divides x by y

x++, ++x

Adds one to x

-x

Reverses the sign on x

x = y

Sets x to the value of y

x -= y

Same as x = x - y

x /= y

Same as x = x / y

.length property

Adds one value to the end of an array

unshift()

Adds one or more items to the beginning of an array.

parseInt()

Takes a value and tries to convert it to an integer

setTim­eout()

Specify that am action should occur on a particular schedule

Math.r­andom

Generaters a random number between 0 and 1

getEle­men­tById()

elemen­t.i­nne­rHTML

returns all the HTML between the opening and closing tags

elemen­t.c­hil­dNodes

A node list of child nodes that are indexed numeri­cally, and appear in source order.

onabort

The user aborted loading the page

onchange

The user changed the object

onerror

The script encoun­tered an error

onload

The object finished loading

onmouseout

The cursor moved off an object

onsubmit

The user submitted a form

onmove

The window is moved

onmouseup

A mouse button is released

ondblclick

A double click of a mouse button

onreset

A reset button is clicked on a form

onkeyup

Triggered when a key is released

x == y

Returns true if x and y are equal

x != y

Returns true if x and y are not equal

x > y

Returns true if x is greater than y

x < y

Returns true if x is less than y

x && y

Returns true if both x and y are true

!x

Returns true if x is false

pop()

Removes the last item from the array

.html()

Retrieve or replaces the HTML inside the selection

.append()

Adds HTML as the last child element of the selected element

.before()

Add HTML outside of a selection, just before the selected element

.remove()

Completely remove a selected element

.addClass

Adds a specified class to an element

.toggl­eCl­ass()

Add a class if it doesn't already exist, or remove the class if it does

.attr()

Reads a specified HTML attribute from a tag. Sets the specified HTML attribute if a second argument is passed.

.each()

To loop through selection of elements with your own anonymous function.

:even and :odd

Selects every other element in a group

:not()

to find elements that don't match a particular selctor type

:conta­ins()

Finds elements that contain specific text

:visible

Locates elements that are visible