IDBLocaleAwareKeyRange

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The IDBLocaleAwareKeyRange interface of the IndexedDB API is a Firefox-specific version of IDBKeyRange — it functions in exactly the same fashion, and has the same properties and methods, but it is intended for use with IDBIndex objects when the original index had a locale value specified upon its creation (see createIndex()'s optionalParameters) — that is, it has locale aware sorting enabled.

Methods

This interface inherits all the methods of its parent interface, IDBKeyRange.

Properties

This interface inherits all the properties of its parent interface, IDBKeyRange.

Bear in mind however that IDBLocaleAwareKeyRange has its own implementation of IDBKeyRange.bound. This is because when you use bound(), it checks if lower bound < upper bound, and throws an exception if that’s not the case. With locale-aware indexes, the meaning of < depends on the locale, so for example in Lithuanian Y is sorted between I and K. The only difference between IDBKeyRange and IDBLocaleAwareKeyRange is that the latter doesn’t do the aforementioned check.

Developers should always use IDBLocaleAwareKeyRange when dealing with locale-aware indexes.

Examples

function displayData() {
  var keyRangeValue = IDBLocaleAwareKeyRange.bound("A", "F");

  var transaction = db.transaction(['fThings'], 'readonly');
  var objectStore = transaction.objectStore('fThings');

  var myIndex = objectStore.index('lName');
  myIndex.openCursor(keyRangeValue).onsuccess = function(event) {
    var cursor = event.target.result;
    if(cursor) {
      var tableRow = document.createElement('tr');
      tableRow.innerHTML =   '&lt;td&gt;' + cursor.value.id + '&lt;/td&gt;'
                           + '&lt;td&gt;' + cursor.value.lName + '&lt;/td&gt;'
                           + '&lt;td&gt;' + cursor.value.fName + '&lt;/td&gt;'
                           + '&lt;td&gt;' + cursor.value.jTitle + '&lt;/td&gt;'
                           + '&lt;td&gt;' + cursor.value.company + '&lt;/td&gt;'
                           + '&lt;td&gt;' + cursor.value.eMail + '&lt;/td&gt;'
                           + '&lt;td&gt;' + cursor.value.phone + '&lt;/td&gt;'
                           + '&lt;td&gt;' + cursor.value.age + '&lt;/td&gt;';
      tableEntry.appendChild(tableRow);  

      cursor.continue();
    } else {
      console.log('Entries all displayed.');    
    }
  };
};

Specifications

Not currently part of any specification.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support No ?431 No No No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No No ?431 No No No

1. From version 43: this feature is behind the dom.indexedDB.experimental preference. To change preferences in Firefox, visit about:config.

See also

Document Tags and Contributors

Contributors to this page: fscholz, Sebastianz, Seta00, chrisdavidmills
Last updated by: fscholz,