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Object doesn't support this property or method


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First of all, I'm very new to J/S.I'm trying a modification of a code snippet I found, but keep getting the error "Object doesn't support this property or method." on this line:

document.getElementById("Finish Codes").value = document.getElementById("Finish Codes rightbox").options.map(function (v) { return encodeURIComponent(v) }).join(',');

The objective is to serialize the options shown in a scrolling list box into a CGI param.Thoughts? Thanks!

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