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1 <!DOCTYPE html> | |
2 <html> | |
3 <!-- | |
4 Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
5 Use of this source code is governed by a BSD-style license that can be | |
6 found in the LICENSE file. | |
7 --> | |
8 <head> | |
9 <meta http-equiv="Pragma" content="no-cache" /> | |
10 <meta http-equiv="Expires" content="-1" /> | |
11 <title>Hello, World!</title> | |
12 <script type="text/javascript"> | |
13 naclModule = null; // Global application object. | |
14 statusText = 'NO-STATUSES'; | |
15 | |
16 function ExtractSearchParameter(name, def_value) { | |
17 var nameIndex = window.location.search.indexOf(name + "="); | |
18 if (nameIndex != -1) { | |
19 var value = location.search.substring(nameIndex + name.length + 1); | |
20 var endIndex = value.indexOf("&"); | |
21 if (endIndex != -1) | |
22 value = value.substring(0, endIndex); | |
23 return value; | |
24 } | |
25 return def_value; | |
26 } | |
27 | |
28 function createNaClModule(name, tool, width, height) { | |
29 var listenerDiv = document.getElementById('listener'); | |
30 var naclModule = document.createElement('embed'); | |
31 naclModule.setAttribute('name', 'nacl_module'); | |
32 naclModule.setAttribute('id', 'file_io'); | |
33 naclModule.setAttribute('width', width); | |
34 naclModule.setAttribute('height',height); | |
35 naclModule.setAttribute('src', tool + '/' + name + '.nmf'); | |
36 naclModule.setAttribute('type', 'application/x-nacl'); | |
37 listenerDiv.appendChild(naclModule); | |
38 } | |
39 // Indicate success when the NaCl module has loaded. | |
40 function moduleDidLoad() { | |
41 naclModule = document.getElementById('nacl_module'); | |
42 updateStatus('SUCCESS'); | |
43 } | |
44 | |
45 // Handle a message coming from the NaCl module. | |
46 function handleMessage(message_event) { | |
47 alert(message_event.data); | |
48 } | |
49 | |
50 // If the page loads before the Native Client module loads, then set the | |
51 // status message indicating that the module is still loading. Otherwise, | |
52 // do not change the status message. | |
53 function pageDidLoad() { | |
54 updateStatus('Page loaded.'); | |
55 if (naclModule == null) { | |
56 tool = ExtractSearchParameter('tool', 'newlib'); | |
57 updateStatus('Creating embed: ' + tool) | |
58 createNaClModule('hello_world', tool, 200, 200) | |
59 } else { | |
60 // It's possible that the Native Client module onload event fired | |
61 // before the page's onload event. In this case, the status message | |
62 // will reflect 'SUCCESS', but won't be displayed. This call will | |
63 // display the current message. | |
64 updateStatus('Waiting.'); | |
65 } | |
66 } | |
67 | |
68 // Set the global status message. If the element with id 'statusField' | |
69 // exists, then set its HTML to the status message as well. | |
70 // opt_message The message test. If this is null or undefined, then | |
71 // attempt to set the element with id 'statusField' to the value of | |
72 // |statusText|. | |
73 function updateStatus(opt_message) { | |
74 if (opt_message) | |
75 statusText = opt_message; | |
76 var statusField = document.getElementById('statusField'); | |
77 if (statusField) { | |
78 statusField.innerHTML = statusText; | |
79 } | |
80 } | |
81 </script> | |
82 </head> | |
83 <body onload="pageDidLoad()"> | |
84 | |
85 <h1>Native Client Simple Module</h1> | |
86 <h2>Status: <code id="statusField">NO-STATUS</code></h2> | |
87 <!-- The <EMBED> element is wrapped inside a <DIV>, which has both a 'load' | |
88 and a 'message' event listener attached. This wrapping method is used | |
89 instead of attaching the event listeners directly to the <EMBED> element to | |
90 ensure that the listeners are active before the NaCl module 'load' event | |
91 fires. This also allows you to use PPB_Messaging.PostMessage() (in C) or | |
92 pp::Instance.PostMessage() (in C++) from within the initialization code in | |
93 your NaCl module. | |
94 | |
95 The src points to a manifest file, which provides the Native Client plug-in | |
96 a mapping between architecture and NaCl Executable (NEXE). | |
97 | |
98 We use a non-zero sized embed to give Chrome space to place the bad plug-in | |
99 graphic, if there is a problem. | |
100 --> | |
101 <div id="listener"> | |
102 <script type="text/javascript"> | |
103 var listener = document.getElementById('listener') | |
104 listener.addEventListener('load', moduleDidLoad, true); | |
105 listener.addEventListener('message', handleMessage, true); | |
106 </script> | |
107 </div> | |
108 </body> | |
109 </html> | |
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