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Append string to file name in javascript function

dodgerfan asked
Last Modified: 2018-04-13
I have a javascript function that gets data from a selected file. I get the name of the file from the file control using getelementbyid, here: var fileSelected = document.getElementById('txtfiletoread');

I do not have much experience with javascript. How can I append text to the file name? The file may be TestFile.txt, but I want ot change it to TestFile.txt:moredata

Would it be something like this: var fileSelected = document.getElementById('txtfiletoread') += ':moredata';
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