Viewport Component

Viewport is a component to ease viewport management. You can get the dimensions of the viewport and beyond, which can be quite helpful to perform some checks with JavaScript.

It's cross-browser compatible:

• Chrome
• Firefox
• Opera
• Safari
• IE9
• IE8
• IE7
• Opera Mobile 12
• Safari Mobile

Installation

$ component install pazguille/viewport

See: https://github.com/component/component

How-to

First, add the following meta viewport:

<meta name="viewport" content="width=device-width,initial-scale=1.0">

Then, initialize the Viewport:

var viewport = require('viewport');

Now, starts to use it!

viewport.height // Returns the current height of the viewport. (Read below the API)

API

Viewport#width

Returns the current width of viewport (in pixels).

Viewport#height

Returns the current height of viewport (in pixels).

Viewport#calculateDimensions()

Calculates/updates the dimensions (width and height) of viewport (in pixels).

Viewport#top

Returns offset top of viewport.

Viewport#right

Returns offset right of viewport.

Viewport#bottom

Returns offset bottom of viewport.

Viewport#left

Returns offset left of viewport.

Viewport#calculateOffset()

Calculates/updates the viewport position.

Viewport#scrollY

Returns vertical scroll position of viewport.

Viewport#scrollX

Returns horizontal scroll position of viewport.

Viewport#calculateScroll()

Calculates/updates the scroll positions (scrollY and scrollX) of viewport.

Viewport#orientation

Returns the device orientation: landscape or portrait.

### Viewport#calculateOrientation() Calculates/updates the device orientation.

### Viewport#calculateMousePostition() Gets the position of the mouse cursor in screen coordinates. Returns an object with the following properties:

• posY: y coordinate of the mouse pointer.
• posX: x coordinate of the mouse pointer.

### Viewport#device Device size is static and doesn't change when the page is resized. Returns an object with size of device (width and height).

### Viewport#inViewport() Calculate if an element is completely located in the viewport. Returns boolean.

### Viewport#isVisible() Calculates if an element is visible in the viewport. Returns boolean.

### Viewport#refresh() Updates the viewport dimension, viewport positions and orientation.

### Events

• scroll: emitted when the viewport are scrolled.
• resize: emitted when the dimensions of the viewport changes.
• bottom: emitted when the viewport position is the bottom.
• top: emitted when the viewport position is the top.

Contact

• Guille Paz (Frontend developer - JavaScript developer | Web standards lover)
• E-mail: guille87paz@gmail.com
• Twitter: @pazguille
• Web: http://pazguille.me

License

### The MIT License Copyright (c) 2012 @pazguille

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.