chrome/test/data/webui/event_target_test.html

   1 <!DOCTYPE html>
   2 <html>
   3 <body>
   4 <script>
   5
   6 /* @const */ var EventTarget;
   7
   8 function setUp(){
   9   EventTarget = cr.EventTarget;
  10 }
  11
  12 function testFunctionListener() {
  13   var fi = 0;
  14   function f(e) {
  15     fi++;
  16   }
  17
  18   var gi = 0;
  19   function g(e) {
  20     gi++;
  21   }
  22
  23   var et = new EventTarget;
  24   et.addEventListener('f', f);
  25   et.addEventListener('g', g);
  26
  27   // Adding again should not cause it to be called twice
  28   et.addEventListener('f', f);
  29   et.dispatchEvent(new Event('f'));
  30   assertEquals(1, fi, 'Should have been called once');
  31   assertEquals(0, gi);
  32
  33   et.removeEventListener('f', f);
  34   et.dispatchEvent(new Event('f'));
  35   assertEquals(1, fi, 'Should not have been called again');
  36
  37   et.dispatchEvent(new Event('g'));
  38   assertEquals(1, gi, 'Should have been called once');
  39 }
  40
  41 function testHandleEvent() {
  42   var fi = 0;
  43   var f = {
  44     handleEvent: function(e) {
  45       fi++;
  46     }
  47   };
  48
  49   var gi = 0;
  50   var g = {
  51     handleEvent: function(e) {
  52       gi++;
  53     }
  54   };
  55
  56   var et = new EventTarget;
  57   et.addEventListener('f', f);
  58   et.addEventListener('g', g);
  59
  60   // Adding again should not cause it to be called twice
  61   et.addEventListener('f', f);
  62   et.dispatchEvent(new Event('f'));
  63   assertEquals(1, fi, 'Should have been called once');
  64   assertEquals(0, gi);
  65
  66   et.removeEventListener('f', f);
  67   et.dispatchEvent(new Event('f'));
  68   assertEquals(1, fi, 'Should not have been called again');
  69
  70   et.dispatchEvent(new Event('g'));
  71   assertEquals(1, gi, 'Should have been called once');
  72 }
  73
  74 function testPreventDefault() {
  75   var i = 0;
  76   function prevent(e) {
  77     i++;
  78     e.preventDefault();
  79   }
  80
  81   var j = 0;
  82   function pass(e) {
  83     j++;
  84   }
  85
  86   var et = new EventTarget;
  87   et.addEventListener('test', pass);
  88
  89   assertTrue(et.dispatchEvent(new Event('test', {cancelable: true})));
  90   assertEquals(1, j);
  91
  92   et.addEventListener('test', prevent);
  93
  94   console.log('NOW');
  95   assertFalse(et.dispatchEvent(new Event('test', {cancelable: true})));
  96   assertEquals(2, j);
  97   assertEquals(1, i);
  98 }
  99
 100
 101 function testReturnFalse() {
 102   var i = 0;
 103   function prevent(e) {
 104     i++;
 105     return false;
 106   }
 107
 108   var j = 0;
 109   function pass(e) {
 110     j++;
 111   }
 112
 113   var et = new EventTarget;
 114   et.addEventListener('test', pass);
 115
 116   assertTrue(et.dispatchEvent(new Event('test', {cancelable: true})));
 117   assertEquals(1, j);
 118
 119   et.addEventListener('test', prevent);
 120
 121   assertFalse(et.dispatchEvent(new Event('test', {cancelable: true})));
 122   assertEquals(2, j);
 123   assertEquals(1, i);
 124 }
 125
 126 </script>
 127 </body>
 128 </html>