PermissionDescriptor.md

PermissionDescriptor

Namespace: SpawnDev.SpawnJS.JSObjects
Source: JSObjects/PermissionDescriptor.cs
MDN Reference: PermissionDescriptor on MDN

An object that sets options for the Permissions.query operation consisting of a comma-separated list of name-value pairs. https://developer.mozilla.org/en-US/docs/Web/API/Permissions/query

Properties

Property	Type	Access	Description
PermissionDescriptor	class	get	An object that sets options for the Permissions.query operation consisting of a comma-separated list of name-value pairs. https://developer.mozilla.org/en-US/docs/Web/API/Permissions/query
UserVisibleOnly	bool?	get
Sysex	bool?	get

Examples

SpawnDev.SpawnJS Mapping Note: The JavaScript examples below show the standard Web API usage. In SpawnDev.SpawnJS, the same API is available with C# conventions:

• Properties and methods use PascalCase (e.g., readyState becomes ReadyState)
• Events use ActionEvent with +=/-= (e.g., addEventListener("click", fn) becomes OnClick += handler)
• Async methods return Task<T> instead of Promise<T>
• Objects should be disposed with using statements
• Access via JS.Get<PermissionDescriptor>(...) or constructor new PermissionDescriptor(...)

Display news based on geolocation permission

navigator.permissions.query({ name: "geolocation" }).then((result) => {
  if (result.state === "granted") {
    showLocalNewsWithGeolocation();
  } else if (result.state === "prompt") {
    showButtonToEnableLocalNews();
  }
  // Don't do anything if the permission was denied.
});

Test support for various permissions

// Array of permissions
const permissions = [
  "accelerometer",
  "accessibility-events",
  "ambient-light-sensor",
  "background-sync",
  "camera",
  "clipboard-read",
  "clipboard-write",
  "geolocation",
  "gyroscope",
  "local-fonts",
  "magnetometer",
  "microphone",
  "midi",
  "notifications",
  "payment-handler",
  "persistent-storage",
  "push",
  "screen-wake-lock",
  "storage-access",
  "top-level-storage-access",
  "window-management",
];

processPermissions();

// Iterate through the permissions and log the result
async function processPermissions() {
  for (const permission of permissions) {
    const result = await getPermission(permission);
    log(result);
  }
}

// Query a single permission in a try...catch block and return result
async function getPermission(permission) {
  try {
    let result;
    if (permission === "top-level-storage-access") {
      result = await navigator.permissions.query({
        name: permission,
        requestedOrigin: window.location.origin,
      });
    } else {
      result = await navigator.permissions.query({ name: permission });
    }
    return `${permission}: ${result.state}`;
  } catch (error) {
    return `${permission} (not supported)`;
  }
}

See full example on MDN