Reference to HTML draggable attribute
Essentially part of convenience functionality which allows you to specify specific LCJS elements as "draggable", this information is automatically passed on to the LCJS charts container DIV when that element is pointed (since LCJS elements are not HTML elements, the DIV is the only actual HTML element).
Add callback function to be triggered when specified event is fired.
// Example syntax
object.addEventListener('click', (event) => {
console.log(event)
})
Some classes also report extra information about the interacted object with the second parameter:
// Most series share information about interacted data point
series.addEventListener('click', (event, info) => {
console.log(info)
})
Optional third parameter allows registering event handlers that will automatically remove themselves after first trigger:
// Example this listener will only fire once
object.addEventListener('click', (event) => {})
Each class has its own list of supported events.
Some events are from HTML standard (click, pointerdown, etc.),
while others are own events from LightningChart JS (dispose, resize, etc.)
To find what events are available, you can try following:
TypeScript enabled, just write addEventListener and see what possible event types the IDE suggests. These APIs are strongly typed, and even the callback event will be correctly typed.K type parameter extends.Callback function that is triggered when event is fired.
Optional options: LCJSAddEventListenerOptionsOptional extra configuration options.
Get elements Background object
Type of Background is generic, see UIBackground for minimum interface.
Background object
Get theme effect enabled on component or disabled.
A theme can specify an Effect to add extra visual oomph to chart applications, like Glow effects around data or other components.
Whether this effect is drawn above a particular component can be configured using the setEffect method.
// Example, disable theme effect from a particular component.
Component.setEffect(false)
For the most part, theme effects are enabled by default on most components.
Theme effect is configured with effect property.
Boolean that describes whether drawing the theme effect is enabled around the component or not.
Get mouse style.
Interface for defining how mouse should look when hovering over UI object
Get font of Label.
FontSettings
Remove event listener added using addEventListener.
The expected argument should be the exact same callback function that was supplied using addEventListener:
// Basic example syntax
const listener = () => {}
obj.addEventListener('click', listener)
obj.removeEventListener('click', listener)
// Basic boilerplate of custom interaction when user drags on an object
obj.addEventListener('pointerdown', (eventDown) => {
let prevCoord = eventDown
const handlePointerMove: LCJSInteractionEventListener<'pointermove'> = (eventMove) => {
const delta = { x: eventMove.clientX - prevCoord.clientX, y: eventMove.clientY - prevCoord.clientY }
prevCoord = eventMove
console.log(delta, eventMove.clientX, eventMove.clientY)
}
const handlePointerUp: LCJSInteractionEventListener<'pointerup'> = (eventUp) => {
window.removeEventListener('pointermove', handlePointerMove)
window.removeEventListener('pointerup', handlePointerUp)
}
window.addEventListener('pointermove', handlePointerMove)
window.addEventListener('pointerup', handlePointerUp)
})
Listener that was added using addEventListener.
Method for mutating Background of object.
Type of Background is generic, see UIBackground for minimum interface.
Object itself for fluent interface
Mutator function for Background
Set theme effect enabled on component or disabled.
A theme can specify an Effect to add extra visual oomph to chart applications, like Glow effects around data or other components.
Whether this effect is drawn above a particular component can be configured using the setEffect method.
// Example, disable theme effect from a particular component.
Component.setEffect(false)
For the most part, theme effects are enabled by default on most components.
Theme effect is configured with effect property.
Object itself.
Theme effect enabled
Set state of component highlighting.
// Example usage
component.setHighlight(true)
Object itself
Boolean or number between 0 and 1, where 1 is fully highlighted.
Set margin around object in pixels.
Object itself
Number with pixel margins for all sides or datastructure with individual pixel margins for each side. Any side can be omitted, only passed values will be overridden.
Set mouse style when hovering over UI object.
Object itself
Interface for defining how mouse should look when hovering over UI object
Set padding around object in pixels. Padding is empty space between the UiElements content and Background
Object itself
Number with pixel margins for all sides or datastructure with individual pixel paddings for each side. Any side can be omitted, only passed values will be overridden.
Set text fill style object
Object itself for fluent interface
Fill style object or function which modifies it
Set font of Label.
Object itself
FontSettings or mutator function for existing settings
Interface for 'TextBox'.