233 lines
9.1 KiB
HTML
233 lines
9.1 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!--
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Copyright (c) 2011 The Chromium Authors. All rights reserved.
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Use of this source code is governed by a BSD-style license that can be
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found in the LICENSE file.
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-->
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<head>
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<title>Load Progress Example</title>
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<script type="text/javascript" src="check_browser.js"></script>
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<script type="text/javascript">
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// Check for Native Client support in the browser before the DOM loads.
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var isValidBrowser = false;
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var browserSupportStatus = 0;
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var checker = new browser_version.BrowserChecker(
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14, // Minumum Chrome version.
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navigator["appVersion"],
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navigator["plugins"]);
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checker.checkBrowser();
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loadProgressModule = null; // Global application object.
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statusText = 'NO-STATUS';
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isValidBrowser = checker.getIsValidBrowser();
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browserSupportStatus = checker.getBrowserSupportStatus();
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// Handler that gets called when the NaCl module starts loading. This
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// event is always triggered when an <EMBED> tag has a MIME type of
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// application/x-nacl.
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function moduleDidStartLoad() {
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appendToEventLog('loadstart');
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}
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// Progress event handler. |event| contains a couple of interesting
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// properties that are used in this example:
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// total The size of the NaCl module in bytes. Note that this value
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// is 0 until |lengthComputable| is true. In particular, this
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// value is 0 for the first 'progress' event.
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// loaded The number of bytes loaded so far.
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// lengthComputable A boolean indicating that the |total| field
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// represents a valid length.
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//
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// event The ProgressEvent that triggered this handler.
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function moduleLoadProgress(event) {
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var loadPercent = 0.0;
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var loadPercentString;
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if (event.lengthComputable && event.total > 0) {
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loadPercent = event.loaded / event.total * 100.0;
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loadPercentString = loadPercent + '%';
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} else {
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// The total length is not yet known.
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loadPercent = -1.0;
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loadPercentString = 'Computing...';
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}
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appendToEventLog('progress: ' + loadPercentString +
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' (' + event.loaded + ' of ' + event.total + ' bytes)');
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}
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// Handler that gets called if an error occurred while loading the NaCl
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// module. Note that the event does not carry any meaningful data about
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// the error, you have to check lastError on the <EMBED> element to find
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// out what happened.
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function moduleLoadError() {
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appendToEventLog('error: ' + loadProgressModule.lastError);
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}
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// Handler that gets called if the NaCl module load is aborted.
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function moduleLoadAbort() {
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appendToEventLog('abort');
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}
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// When the NaCl module has loaded indicate success.
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function moduleDidLoad() {
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loadProgressModule = document.getElementById('load_progress');
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appendToEventLog('load');
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updateStatus('SUCCESS');
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}
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// Handler that gets called when the NaCl module loading has completed.
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// You will always get one of these events, regardless of whether the NaCl
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// module loaded successfully or not. For example, if there is an error
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// during load, you will get an 'error' event and a 'loadend' event. Note
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// that if the NaCl module loads successfully, you will get both a 'load'
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// event and a 'loadend' event.
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function moduleDidEndLoad() {
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appendToEventLog('loadend');
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var lastError = event.target.lastError;
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if (lastError == undefined || lastError.length == 0) {
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lastError = '<none>';
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}
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appendToEventLog('lastError: ' + lastError);
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}
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// Handle a message coming from the NaCl module.
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function handleMessage(message_event) {
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alert(message_event.data);
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}
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// Set the global status message. Updates the 'status_field' element with
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// the new text.
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// opt_message The message text. If this is null or undefined, then
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// attempt to set the element with id 'status_field' to the value of
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// |statusText|.
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function updateStatus(opt_message) {
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if (opt_message)
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statusText = opt_message;
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var statusField = document.getElementById('status_field');
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if (statusField) {
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statusField.innerHTML = statusText;
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}
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}
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// Append an event name to the 'event_log_field' element. Event names
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// are separated by a <br> tag so they get listed one per line.
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// logMessage The message to append to the log.
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function appendToEventLog(logMessage) {
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var eventLogField = document.getElementById('event_log_field');
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if (eventLogField.innerHTML.length == 0) {
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eventLogField.innerHTML = logMessage;
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} else {
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eventLogField.innerHTML = eventLogField.innerHTML +
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'<br />' +
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logMessage;
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}
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}
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</script>
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</head>
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<body>
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<h1>Native Client Load Event Example</h1>
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<h2>Event Log</h2>
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<div id="event_log_field"></div>
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<h2>Status</h2>
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<div id="status_field">NO-STATUS</div>
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<div id="listener">
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<script type="text/javascript">
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var listener = document.getElementById('listener');
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listener.addEventListener('loadstart', moduleDidStartLoad, true);
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listener.addEventListener('progress', moduleLoadProgress, true);
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listener.addEventListener('error', moduleLoadError, true);
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listener.addEventListener('abort', moduleLoadAbort, true);
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listener.addEventListener('load', moduleDidLoad, true);
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listener.addEventListener('loadend', moduleDidEndLoad, true);
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listener.addEventListener('message', handleMessage, true);
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switch (browserSupportStatus) {
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case browser_version.BrowserChecker.StatusValues.NACL_ENABLED:
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appendToEventLog('Native Client plugin enabled.');
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break;
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case browser_version.BrowserChecker.StatusValues.UNKNOWN_BROWSER:
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updateStatus('UNKNOWN BROWSER');
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break;
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case browser_version.BrowserChecker.StatusValues.CHROME_VERSION_TOO_OLD:
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appendToEventLog(
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'Chrome too old: You must use Chrome version 14 or later.');
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updateStatus('NEED CHROME 14 OR LATER');
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break;
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case browser_version.BrowserChecker.StatusValues.NACL_NOT_ENABLED:
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appendToEventLog(
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'NaCl disabled: Native Client is not enabled.<br>' +
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'Please go to <b>chrome://plugins</b> and enable Native Client ' +
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'plugin.');
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updateStatus('NaCl NOT ENABLED');
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break;
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case browser_version.BrowserChecker.StatusValues.NOT_USING_SERVER:
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appendToEventLog(
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'file: URL detected, please use a web server to host Native ' +
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'Client applications.');
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updateStatus('NaCl NOT ENABLED');
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default:
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appendToEventLog('Unknown error: Unable to detect browser and/or ' +
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'Native Client support.');
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updateStatus('UNKNOWN ERROR');
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break;
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}
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</script>
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<!-- Load the published .nexe. This includes the 'src' attribute which
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shows how to load multi-architecture modules. Each entry in the "nexes"
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object in the .nmf manifest file is a key-value pair: the key is the runtime
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('x86-32', 'x86-64', etc.); the value is a URL for the desired NaCl module.
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To load the debug versions of your .nexes, set the 'src' attribute to the
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_dbg.nmf version of the manifest file.
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Note: The <EMBED> element is wrapped inside a <DIV>, which has both a 'load'
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and a 'message' event listener attached. This wrapping method is used
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instead of attaching the event listeners directly to the <EMBED> element to
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ensure that the listeners are active before the NaCl module 'load' event
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fires. This also allows you to use PPB_Messaging.PostMessage() (in C) or
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pp::Instance.PostMessage() (in C++) from within the initialization code in
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your NaCl module.
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-->
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<embed name="nacl_module"
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id="load_progress"
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width=0 height=0
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src="osmand.nmf"
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type="application/x-nacl" />
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<script type="text/javascript">
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loadProgressModule = document.getElementById('load_progress');
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// Futher diagnose NaCl loading.
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if (loadProgressModule == null ||
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typeof loadProgressModule.readyState == 'undefined') {
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switch (browserSupportStatus) {
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case browser_version.BrowserChecker.StatusValues.NACL_ENABLED:
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// The NaCl plugin is enabled and running, it's likely that the flag
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// isn't set.
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appendToEventLog(
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'NaCl flag disabled: The Native Client flag is not enabled.<br>' +
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'Please go to <b>chrome://flags</b> enable Native Client and ' +
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'relaunch your browser. See also: ' +
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'<a href="http://code.google.com/chrome/nativeclient/docs/' +
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'running.html">Running Web Applications that Use Native Client' +
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'</a>');
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updateStatus('NaCl NOT ENABLED');
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break;
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case browser_version.BrowserChecker.StatusValues.UNKNOWN_BROWSER:
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appendToEventLog('Native Client applications are not supported by ' +
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'this browser.');
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break;
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default:
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appendToEventLog('Unknown error when loading Native Client ' +
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'application.');
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}
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}
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</script>
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</div>
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</body>
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</html>
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