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Add referrerPolicy to TileLayer (#7945)

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* add referrerPolicy to TileLayer, fixes #7943

* fix typo in docstring

HT: https://github.com/Leaflet/Leaflet/pull/7945#discussion_r792419377

* drop the "true" option handling for the new referrerPolicy TileLayer option

https://github.com/Leaflet/Leaflet/pull/7945#discussion_r793113681
This commit is contained in:
Nathan Vander Wilt
2022-01-26 18:23:41 -08:00
committed by GitHub
parent 409c17c14b
commit f1f4e05ba1
1 changed files with 15 additions and 1 deletions
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16
src/layer/tile/TileLayer.js
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@ -77,7 +77,15 @@ export var TileLayer = GridLayer.extend({
// Whether the crossOrigin attribute will be added to the tiles.
// If a String is provided, all tiles will have their crossOrigin attribute set to the String provided. This is needed if you want to access tile pixel data.
// Refer to [CORS Settings](https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_settings_attributes) for valid String values.
crossOrigin: false
crossOrigin: false,
// @option referrerPolicy: Boolean|String = false
// Whether the referrerPolicy attribute will be added to the tiles.
// If a String is provided, all tiles will have their referrerPolicy attribute set to the String provided.
// This may be needed if your map's rendering context has a strict default but your tile provider expects a valid referrer
// (e.g. to validate an API token).
// Refer to [HTMLImageElement.referrerPolicy](https://developer.mozilla.org/en-US/docs/Web/API/HTMLImageElement/referrerPolicy) for valid String values.
referrerPolicy: false
},
initialize: function (url, options) {
@ -140,6 +148,12 @@ export var TileLayer = GridLayer.extend({
tile.crossOrigin = this.options.crossOrigin === true ? '' : this.options.crossOrigin;
}
// for this new option we follow the documented behavior
// more closely by only setting the property when string
if (typeof this.options.referrerPolicy === 'string') {
tile.referrerPolicy = this.options.referrerPolicy;
}
/*
Alt tag is set to empty string to keep screen readers from reading URL and for compliance reasons
https://www.w3.org/TR/WCAG20-TECHS/H67