IDBKeyRange.lowerOpen

The lowerOpen read-only property of the IDBKeyRange interface returns a boolean indicating whether the lower-bound value is included in the key range.

Note: This feature is available in Web Workers.

Syntax

var lowerOpen = myKeyRange.lowerOpen

Value

A boolean:

Value Indication
true The lower-bound value is not included in the key range.
false The lower-bound value is included in the key range.
 

Example

The following example illustrates how you'd use a key range. Here we declare keyRangeValue = IDBKeyRange.upperBound("F", "W", true, true); — a range that includes everything between "F" and "W" but not including them — since both the upper and lower bounds have been declared as open (true). We open a transaction (using IDBTransaction) and an object store, and open a Cursor with IDBObjectStore.openCursor, declaring keyRangeValue as its optional key range value.

After declaring the key range, we log its lowerOpen property value to the console, which should appear as "true": the lower bound is open, so won't be included in the range.

Note: For a more complete example allowing you to experiment with key range, have a look at our IDBKeyRange-example repo (view the example live too.)

function displayData() {
  var keyRangeValue = IDBKeyRange.bound("F", "W", true, true);
  console.log(keyRangeValue.lowerOpen);

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

  objectStore.openCursor(keyRangeValue).onsuccess = function(event) {
    var cursor = event.target.result;
      if(cursor) {
        var listItem = document.createElement('li');
        listItem.innerHTML = '<strong>' + cursor.value.fThing + '</strong>, ' + cursor.value.fRating;
        list.appendChild(listItem);

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

Specifications

Specification Status Comment
Indexed Database API 2.0
The definition of 'lowerOpen' in that specification.
Recommendation
Indexed Database API 2.0
The definition of 'lowerOpen' in that specification.
Recommendation

Browser compatibility

BCD tables only load in the browser

See also