native_client_sdk/src/examples/demo/voronoi/example.js

// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

function moduleDidLoad() {
}

function postThreadFunc(numThreads) {
  return function () {
    common.naclModule.postMessage({'message' : 'set_threads',
                                   'value' : numThreads});
  }
}

// Add event listeners after the NaCl module has loaded.  These listeners will
// forward messages to the NaCl module via postMessage()
function attachListeners() {
  document.getElementById('benchmark').addEventListener('click',
    function() {
      common.naclModule.postMessage({'message' : 'run_benchmark'});
      common.updateStatus('BENCHMARKING... (please wait)');
    });
  document.getElementById('drawPoints').addEventListener('click',
    function() {
      var checked = document.getElementById('drawPoints').checked;
      common.naclModule.postMessage({'message' : 'draw_points',
                                     'value' : checked});
    });
  document.getElementById('drawInteriors').addEventListener('click',
    function() {
      var checked = document.getElementById('drawInteriors').checked;
      common.naclModule.postMessage({'message' : 'draw_interiors',
                                     'value' : checked});
    });
  var threads = [0, 1, 2, 4, 6, 8, 12, 16, 24, 32];
  for (var i = 0; i < threads.length; i++) {
    document.getElementById('radio' + i).addEventListener('click',
        postThreadFunc(threads[i]));
  }
  document.getElementById('pointRange').addEventListener('input',
    function() {
      var value = parseFloat(document.getElementById('pointRange').value);
      common.naclModule.postMessage({'message' : 'set_points',
                                     'value' : value});
      document.getElementById('pointCount').textContent = value + ' points';
    });
}

// Handle a message coming from the NaCl module.
// In the Voronoi example, the only message will be the benchmark result.
function handleMessage(message_event) {
  if (message_event.data['message'] == 'benchmark_result') {
    var x = (Math.round(message_event.data['value'] * 1000) / 1000).toFixed(3);
    document.getElementById('result').textContent =
      'Result: ' + x + ' seconds';
    common.updateStatus('SUCCESS')
  }
}