37 lines
1.2 KiB
JavaScript
37 lines
1.2 KiB
JavaScript
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// document.currentScript polyfill by Adam Miller
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// MIT license
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(function(document){
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var currentScript = "currentScript",
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scripts = document.getElementsByTagName('script'); // Live NodeList collection
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// If browser needs currentScript polyfill, add get currentScript() to the document object
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if (!(currentScript in document)) {
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Object.defineProperty(document, currentScript, {
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get: function(){
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// IE 6-10 supports script readyState
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// IE 10+ support stack trace
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try { throw new Error(); }
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catch (err) {
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// Find the second match for the "at" string to get file src url from stack.
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// Specifically works with the format of stack traces in IE.
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var i, res = ((/.*at [^\(]*\((.*):.+:.+\)$/ig).exec(err.stack) || [false])[1];
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// For all scripts on the page, if src matches or if ready state is interactive, return the script tag
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for(i in scripts){
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if(scripts[i].src == res || scripts[i].readyState == "interactive"){
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return scripts[i];
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}
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}
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// If no match, return null
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return null;
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}
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}
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});
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}
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})(document);
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