Convert Excel headers to numbers

Quite often I have to convert datasets from one source to another target. Sometimes I can only export them as CSV to investigate the field order/column structure

Then, once I work out the columns I can import them. But, the headings are often not in the source, so I only have Excel/OpenOffice column headers which go from A to Z and then AA to AZ, and BA to BZ, etc etc

I needed a quick way to convert these to numbers, so I could state “the 141st column is /this/ field”

So here it is:

$(document).ready(function() {
    $("#testes").on("keyup", function(event) {
        var str = $(this).val();
        if (str.length == 1) {
        } else {
            var fstr = str.slice(0,1);
            var estr = str.slice(1,2);
            $("#results").val(get_string_value(estr) + (get_string_value(fstr) * 26));

function get_string_value(str) {
    return str.charCodeAt() - 96;

Or if you like, a fiddle:

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