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Detect that a specific Chrome extension
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| function detectChromeExtension(extensionId, accesibleResource, callback) { | |
| if (typeof(chrome) !== 'undefined') { | |
| var xmlHttp = new XMLHttpRequest(), | |
| testUrl = 'chrome-extension://' + extensionId + '/' + accesibleResource; | |
| xmlHttp.open('HEAD', testUrl, true); | |
| xmlHttp.setRequestHeader('Content-type', 'application/x-www-form-urlencoded'); | |
| xmlHttp.timeout = 1000; | |
| xmlHttp.onreadystatechange = function () { | |
| if (xmlHttp.readyState == 4 && typeof(callback) == 'function') { | |
| if (xmlHttp.status == 200) { | |
| callback.call(this, true); | |
| } else { | |
| callback.call(this, false); | |
| } | |
| } | |
| }; | |
| xmlHttp.ontimeout = function () { | |
| if (typeof(callback) == 'function') | |
| callback.call(this, false); | |
| }; | |
| xmlHttp.send(); | |
| } else { | |
| if (typeof(callback) == 'function') | |
| callback.call(this, false); | |
| } | |
| } |
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| detectChromeExtension('pimkadpiclhfobplcdjbnjgjmjfdklig', 'img/icon128.png', | |
| function myCallbackFunction(extensionExists) { | |
| if (!extensionExists) { | |
| element.removeClass('hidden'); | |
| } | |
| }); |
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font: http://www.willhawker.com/what-i-learnt-today/20-11-2012/27