History

A history is an interface to the navigation stack. The history serves as the source of truth for the current location, as well as provides a set of methods that may be used to change it.

It is similar to the DOM's window.history object, but with a smaller, more focused API.

interface History {

readonly action: Action;

readonly location: Location;

createHref(to: To): string;

encodeLocation(to: To): Path;

go(delta: number): void;

listen(listener: Listener): () => void;

push(to: To, state?: any): void;

replace(to: To, state?: any): void;

}

§Properties

readonly action: Action

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The last action that modified the current location. This will always be Action.Pop when a history instance is first created. This value is mutable.

readonly location: Location

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The current location. This value is mutable.

§Methods

createHref(to: To): string

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Returns a valid href for the given to value that may be used as the value of an attribute.

@param to

The destination URL

encodeLocation(to: To): Path

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Encode a location the same way window.history would do (no-op for memory history) so we ensure our PUSH/REPLACE navigations for data routers behave the same as POP

@param to

Unencoded path

go(delta: number): void

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Navigates n entries backward/forward in the history stack relative to the current index. For example, a "back" navigation would use go(-1).

@param delta

The delta in the stack index

listen(listener: Listener): () => void

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Sets up a listener that will be called whenever the current location changes.

@param listener

A function that will be called when the location changes

@return

unlisten - A function that may be used to stop listening

push(to: To, state?: any): void

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Pushes a new location onto the history stack, increasing its length by one. If there were any entries in the stack after the current one, they are lost.

@param to

The new URL

@param state

Data to associate with the new location

replace(to: To, state?: any): void

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Replaces the current location in the history stack with a new one. The location that was replaced will no longer be available.

@param to

The new URL

@param state

Data to associate with the new location