@gullerya/spotlight
v1.6.0
Published
spotlight an abitrary DOM element while fading out the rest of the content
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Summary
spotlight
let's you to visually highlight a chosen element; this is done by shading over the surrounding content
Below is an example of spotlight
used in a callout
framework:
Support matrix: 61+ | 60+ | 16+
Last versions (full changelog is here)
1.5.1
1.4.0
- Implemented Issue #2 - allow to create spotlight without a target for the beginning
- overrode
getBoundingClientRect
method to return useful dimensions of the spotted area - minor styling adjustements of the transitions
1.3.2
- Fixed Issue #1 - misposition of the inner fence on window resize
- minor styling adjustements of the inner fence
Base API
spotlight
library consists of a single entry-level API,
allowing to create a spotlight-scene
with a given parameters,
applied to the DOM.
Additionally, some constant enumerators provided for convenience.
This component may then be further interacted via component's own APIs as described below, to change its appearance, flavor or spot target, and to be removed at the end of usage.
Each spotlight-scene
is self-contained and isolated,
therefore it is possible to create as many 'spotlights' as needed,
even if in the real use-cases one would rarely need more than a single instance.
import:
Import the library and it's constants as in example below:
import { spotlight, SHAPES } from './dist/spotlight.min.js';
syntax:
Imported spotlight
is a function syntaxed as below:
const slsElement = function spotlight(target[, container[, options]]) { ... }
parameters:
target
[optional]- a target element to place the spot over
- MAY NOT be a
document.body
container
[optional]- a container to shadow contents around the
target
- when provided,
container
MUST be an ancestor of thetarget
- default
container
isdocument.body
- a container to shadow contents around the
options
[optional]shape
- seeshape
property definition below,shadowColor
- seeshadowColor
property definition belowtransitionDuration
- seetransitionDuration
property definition below
spotlight-scene
component APIs
The base API outlined above serves as an entry point for the interop with the library.
The result of that function is the spotlight-scene
component instance.
It is already applied to the DOM, unless explicitly opted out via the options
above.
This component may by further interacted via it's own APIs. Common use-case for this is to move smoothly the spotlight from one element to another, given that all of them are children of the same parent.
Another obvious need is to remove the spotlight-scene
from the DOM
when not needed anymore.
In all of the further APIs I'll use
sls
term to represent the concretespotlight-scene
instance that the properties and methods belong to.
properties:
sls.container
[DOM element] [read only]- returns the
container
element that the component was initialized with (see base API above) container
MAY NOT be changed
- returns the
sls.target
[DOM element] - 'spotted' element- setting this property will move the 'spotlight' to another
target
- acceptible values are subject to the same constraints as in the main API
- MUST be an element
- MUST be a descendend of the
container
- setting this property will move the 'spotlight' to another
sls.shape
[enum] - shape of the spotlight, defaults tocircle
- setting this property on a 'living' component will be immediatelly applied
- acceptible values:
circle
oval
box
- values better to be taken from the
SHAPES
enum, likeSHAPES.circle
sls.shadowColor
[Array forrgba
(CSS) function] - valid Array forrgba
CSS function; defaults to[0, 0, 0, 0.8]
- setting this property will have an immediate effect
sls.transitionDuration
[number] - duration in millis of spotlight's transitions (move from target to target, shape change, etc); defaults to333
- setting this property will be effective from the next transition forth
methods:
sls.close()
- returns
Promise
, resolved when all done - removes the
spotlight-scene
component and performs all relevant cleanups
- returns
sls.moveTo(targetElement)
- returns
Promise
, resolved when move it finished targetElement
subject to the same constraintstarget
property above
- returns
sls.getBoundingClientRect()
- overrides the native method
- returns the bounding client rectangle of the spotted area
Typical usage example
The flow below exemplifies typical usage of the library:
const t1 = <... the element to be spotted>;
const t2 = <... another one>;
const t3 = <... another one>;
const sl = spotlight(t1); // the spotlight is shown now
...
sl.target = t2; // spotlight moved to a new target
sl.style.color = '#110'; // color of the shade is adjusted...
sl.shape = SHAPES.oval; // ... and spot's shape too
...
sl.transitionDuration = 500; // slow it down a bit
sl.moveTo(t3)
.then(() => console.log('spotlight moved, do something...'));
sl.close();