nolanlawson/_idb_simultaneous.md

## _idb_simultaneous.md

      
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              _idb_simultaneous.md
            
          
    Tests simultaneous DB access for IndexedDB

  
## index.html
<!DOCTYPE html>
<html lang="en">
<body>
<pre id="output"></pre>
<script src="index.js"></script>
</body>
</html>

## index.js
var pre = document.getElementById('output')
function log(msg) {
  pre.innerHTML = pre.innerHTML + msg + "\n";
}

function openDB1() {
  var req = indexedDB.open('mydb', 1);
  req.onupgradeneeded = function (e) {
    log('successfully upgraded db #1');
  };
  req.onsuccess = function (e) {
    log('successfully opened db #1');
    openDB2();
  };
  req.onerror = function(e) {
    log('error on db #1: ' + e);
  }
}

function openDB2() {
  var req = indexedDB.open('mydb', 1);
  req.onupgradeneeded = function (e) {
    log('successfully upgraded db #2');
  };
  req.onsuccess = function (e) {
    log('successfully opened db #2');
  };
  req.onerror = function(e) {
    log('error on db #2: ' + e);
  }
}

openDB1();
	<!DOCTYPE html>
	<html lang="en">
	<body>
	<pre id="output"></pre>
	<script src="index.js"></script>
	</body>
	</html>
	var pre = document.getElementById('output')
	function log(msg) {
	pre.innerHTML = pre.innerHTML + msg + "\n";
	}

	function openDB1() {
	var req = indexedDB.open('mydb', 1);
	req.onupgradeneeded = function (e) {
	log('successfully upgraded db #1');
	};
	req.onsuccess = function (e) {
	log('successfully opened db #1');
	openDB2();
	};
	req.onerror = function(e) {
	log('error on db #1: ' + e);
	}
	}

	function openDB2() {
	var req = indexedDB.open('mydb', 1);
	req.onupgradeneeded = function (e) {
	log('successfully upgraded db #2');
	};
	req.onsuccess = function (e) {
	log('successfully opened db #2');
	};
	req.onerror = function(e) {
	log('error on db #2: ' + e);
	}
	}

	openDB1();