How do I change file extension with javascript
Does anyone know an easy way to change a file extension in Javascript?
For example, I have a variable with "first.docx" but I need to change it to "first.html".
This will change the string containing the file name;
file = file.substr(0, file.lastIndexOf(".")) + ".htm";
For situations where there may not be an extension:
var pos = file.lastIndexOf(".");
file = file.substr(0, pos < 0 ? file.length : pos) + ".htm";
file = file.replace(/.[^.]+$/, '.html');
This probably won't get many upvotes but I couldn't resist.
This code will deal with the edge case where a file might not have an extension already (in which case it will add it). It uses the "tilde trick"
function changeExt (fileName, newExt) {
var _tmp
return fileName.substr(0, ~(_tmp = fileName.lastIndexOf('.')) ? _tmp : fileName.length) + '.' + newExt
}
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