# Parallax

Animate CSS properties depending on the scroll position of the document.

## Usage

To apply this component, add the `data-uk-parallax` attribute to a container element. Add an option with the desired animation target value for each CSS property you want to animate.

# Heading

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.

### Markup

    <div data-uk-parallax="{bg: '-200'}">...</div>

## Options

UIkit provides a number of options that you can add to the `data-uk-parallax` attribute:

Option | Description
--- | ---
`x` | Animate translateX in pixels.
`xp` | Animate translateX in percent.
`y` | Animate translateY in pixels.
`yp` | Animate translateY in percent.
`bg` | Animate a background image.
`bgp` | Animate a background image in percent.
`rotate` | Animate rotation clockwise in degree.
`scale` | Animate scaling.
`color` | Animate color (needs start and stop value).
`background-color` | Animate background-color (needs start and stop value).
`border-color` | Animate border color (needs start and stop value).
`opacity` | Animate the opacity.

NOTE You can basically animate any CSS property that has a single value, like width and height, by adding it to the attribute.

### Markup

    <div data-uk-parallax="{y: '-200', opacity: '0'}">...</div>

### Start and stop values

Properties are always animated from the current value to the target value which you set in the option. However, you can also define a start value yourself. This is done by passing a string to the option which contains two values separated by comma.

NOTE Some properties, like colors, require a start and a stop value!

#### Markup

    <div data-uk-parallax="{x: '-100,100', 'background-color': '#EBF7FD,#FFF1F0'}">...</div>

## Nested animation

Using different animations for nested elements is a simple task. Just create another container within the first parallax container and add your options to a new `data-uk-parallax` attribute.

### Example

# Heading

Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.

### Markup

    <div data-uk-parallax="{bg: -200}">
        <div data-uk-parallax="{opacity: '0,1', scale: '0,1'}">...</div>
    </div>

## Target Option

Usually, the animation lasts as long as the element itself is in the viewport. To start and stop the animation based on the viewport visibility of another element, use the `target` option. This can be helpful when using nested animations.

### Example

# Heading

This text is animated as long as the headline "Target Option" is in the viewport.

### Markup

    <div id="target-id">...</div>
    <div data-uk-parallax="{target: '#target-id'}">...</div>

## Velocity

To adjust the easing of the animation, add the `velocity` option.

### Example

0.04
0.2
0.6
1
2
3
4

### Markup

    <div data-uk-parallax="{velocity: '0.5'}">
        ...
    </div>

## Viewport

Using the `viewport` option, the animation duration can be adjusted. With the value `1` or `false` the animation lasts as long as the element is in the viewport. Setting it to `0.5`, for example, animates the property only in the first half of the viewport.

### Example

# Heading

This text is animated until it reaches the middle of the viewport.

### Markup

    <div data-uk-parallax="{viewport: '0.5'}">...</div>

## JavaScript options

Option | Possible value | Default | Description
--- | --- | --- | ---
`velocity` | float | 0.5 | Animation velocity during scrolling
`target` | mixed | false | Element dimension reference for animation duration.
`viewport` | float (0 to 1) | false | Animation range depending on the viewport.
`media` | integer / string | false | Condition for the active status with a width as integer (e.g. 640) or a css media query

### Init element manually

    var parallax = UIkit.parallax(element, { /* options */ });