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chemdemo/post_message.js

Created April 17, 2014 12:07
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Test postMessage
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post_message.js
// see => http://jsperf.com/postmessage
var echoSetTimeout = (function() {
return function(msg, cb) {
setTimeout(cb, 0);
}
})();
var echoWorker = (function() {
var code = 'onmessage = function(e) { postMessage(e.data) };';
var blobBuilder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder;
if(!blobBuilder) {
return echoSetTimeout;
}
var bb = new (blobBuilder)();
bb.append(code);
var blobURL = (window.URL || window.webkitURL || window.mozURL).createObjectURL(bb.getBlob());
var worker = new Worker(blobURL);
return function(msg, cb) {
worker.onmessage = cb;
worker.postMessage(msg);
};
})();
var echoIFramePostMessage = (function() {
var iframe = document.createElement('iframe');
window.onload = function() {
iframe.style.display = 'none';
document.body.appendChild(iframe);
iframe.contentDocument.write('<html><head><script>onmessage = function(e) { e.source.postMessage(e.data, \'*\') };<'+'/script><'+'/head><'+'/html>');
};
return function(msg, cb) {
window.onmessage = cb;
iframe.contentWindow.postMessage(msg, '*');
};
})();
var echoPostMessage = (function() {
return function(msg, cb) {
async = false;
window.onmessage = cb;
window.postMessage(msg, '*');
async = true;
};
})();
var payload = {
shortString: 'test',
simple: {
foo: "bar",
arr: []
}
};
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