third_party/WebKit/LayoutTests/fast/events/dispatch-event-being-dispatched.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4 <script src="../../resources/js-test.js"></script>
   5 </head>
   6 <body>
   7 <p class="description">
   8 Tests that dispatchEvent raises DISPATCH_REQUEST_ERR if the event
   9 being dispatched is already being dispatched.
  10 </p>
  11 <pre id="console">
  12 </pre>
  13 <script>
  14 if (window.testRunner)
  15     testRunner.dumpAsText();
  16
  17 jsTestIsAsync = true;
  18
  19 function shouldBeDispatchRequestErr(exception) {
  20     var ok = Object.getPrototypeOf(exception) == DOMException.prototype && exception.name == 'InvalidStateError';
  21     (ok ? testPassed : testFailed)("should have got DISPATCH_REQUEST_ERR EventException");
  22 }
  23
  24 // try redispatching an event in the process of being dispatched with
  25 // dispatchEvent
  26
  27 function redispatchCustom(event) {
  28     try {
  29         window.dispatchEvent(event);
  30         testFailed('dispatchEvent of an event being dispatched should throw an exception');
  31     } catch (ex) {
  32         shouldBeDispatchRequestErr(ex);
  33     }
  34
  35     redispatchCustom.wasInvoked = true;
  36 }
  37
  38 var customEvent = document.createEvent('CustomEvent');
  39 customEvent.initCustomEvent('foo', true, true, null);
  40 var p = document.querySelector('.description');
  41 p.addEventListener('foo', redispatchCustom);
  42 p.dispatchEvent(customEvent);
  43 shouldBeTrue('redispatchCustom.wasInvoked');
  44
  45 // try redispatching an event that has already finished being dispatched
  46
  47 function checkCustom(event) {
  48     checkCustom.wasInvoked = true;
  49 }
  50
  51 p.removeEventListener('foo', redispatchCustom, true);
  52 p.addEventListener('foo', checkCustom, true);
  53 p.dispatchEvent(customEvent);
  54 shouldBeTrue('checkCustom.wasInvoked');
  55
  56 // try redispatching an event in the process of being dispatched by
  57 // the browser
  58
  59 function redispatchLoad(event) {
  60     if (redispatchLoad.dispatching) {
  61         testFailed('dispatchEvent of an event being dispatched should not dispatch the event again');
  62         return;
  63     }
  64
  65     try {
  66         redispatchLoad.dispatching = true;
  67         document.dispatchEvent(event);
  68         testFailed('dispatchEvent of an event being dispatched should throw an exception');
  69     } catch (ex) {
  70         shouldBeDispatchRequestErr(ex);
  71     } finally {
  72         delete redispatchLoad.dispatching;
  73     }
  74
  75     finishJSTest();
  76 }
  77
  78 window.addEventListener('load', redispatchLoad, true);
  79 </script>
  80 </body>
  81 </html>