Created
January 21, 2013 03:55
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postMessage structured clone detection
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<p id="support"></p> |
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Copyright (c) 2013 Ryan Seddon | |
Permission is hereby granted, free of charge, to any person | |
obtaining a copy of this software and associated documentation | |
files (the "Software"), to deal in the Software without | |
restriction, including without limitation the rights to use, | |
copy, modify, merge, publish, distribute, sublicense, and/or sell | |
copies of the Software, and to permit persons to whom the | |
Software is furnished to do so, subject to the following | |
conditions: | |
The above copyright notice and this permission notice shall be | |
included in all copies or substantial portions of the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES | |
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | |
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
OTHER DEALINGS IN THE SOFTWARE. |
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/* | |
* Copyright (c) 2013 Ryan Seddon | |
* Licensed under the MIT license. | |
*/ | |
var support = 0, | |
_bTestResults, | |
result = document.getElementById("support"); | |
// Beacon the results to Browserscope. | |
var beaconResults = function() { | |
var resultdata = (support ? "<span style='color:#090; font-weight: bold; font-size: 1.2em;'>DOES</span>" : "<span style='color:#C00; font-weight: bold; font-size: 1.2em;'>DOES NOT</span>" ); | |
result.innerHTML = "Your browser " + resultdata + " support structured clones"; | |
var testKey = 'agt1YS1wcm9maWxlcnINCxIEVGVzdBiPp8ALDA'; | |
var newScript = document.createElement('script'), | |
firstScript = document.getElementsByTagName('script')[0]; | |
newScript.src = 'http://www.browserscope.org/user/beacon/' + testKey; | |
firstScript.parentNode.insertBefore(newScript, firstScript); | |
}; | |
if(!!window.postMessage) { | |
try { | |
// Safari 5.1 will sometimes throw an exception and sometimes won't, lolwut? | |
// When it doesn't we capture the message event and check the | |
// internal [[Class]] property of the message being passed through. | |
// Safari will pass through DOM nodes as Null, gotcha. | |
window.onmessage = function(e){ | |
support = Object.prototype.toString.call(e.data).indexOf("Null") != -1 ? 1 : 0; | |
_bTestResults = { | |
'structured_clones': support | |
}; | |
beaconResults(); | |
} | |
// Spec states you can't transmit DOM nodes and it will throw an error | |
// postMessage implimentations that support cloned data will throw. | |
window.postMessage(document.createElement("a"),"*"); | |
} catch(e) { | |
support = e.DATA_CLONE_ERR ? 1 : 0; | |
_bTestResults = { | |
'structured_clones': support | |
}; | |
beaconResults(); | |
} | |
} |
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