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fileIdValue is your request parameter?
If so, scriptlet can help in this.
Else if this will be javascript value only, you may need to have initial resource url available as js variable (say downloadResUrl) and append the parameter to that in javascript scope only.

function downloadFile(fileIdValue)
{
var downloadResUrl = '<portlet:resourceurl></portlet:resourceurl>';
location = Liferay.Util.addParams("fileId="+fileIdValue, downloadResUrl);
}

 

Tanks fot the support Yogesh Sharma.I've implemented it and now my code is more clean =)

This is my actual code now:

function downloadFile(fileIdValue)
{
	var downloadResUrl = '<portlet:resourceURL></portlet:resourceURL>';
	location = Liferay.Util.addParams("fileId="+fileIdValue, downloadResUrl);
	return false;
}