italodr/sample.html

## sample.html
<html>
    <head>
        ( ... )
    </head>
    <body data-utmcampaing="my-campaing" data-utmdate="20151105">

    <a href="http://some-address-to-go.com" data-utmterm="the_term">Some link</a>
    <a href="http://some-address-to-go.com?with=query" data-utmterm="the_term">Some link with querystring</a>
    <a href="http://some-address-to-go.com" no-utm>Some link not trackable</a>

    </body>
</html>

## utm-tracker.js
$(function() {

    var utmCampaign = $('body').data('utmcampaign'),
        utmDate     = $('body').data('utmdate');

    var getTrackingTail = function(utmCampaign, utmTerm, hasHash) {

        if (typeof hasHash === undefined) {
            hasHash = false;
        }
        var trackingTail  = (hasHash) ? '&' : '?';
            trackingTail += 'utm_medium='    + 'the_medium';
            trackingTail += '&utm_source='   + 'the_source';
            trackingTail += '&utm_content='  + 'the_content';
            trackingTail += '&utm_campaign=' + utmCampaign;
            trackingTail += '&utm_term='     + utmTerm;

        return trackingTail;
    };

    $('a').each(function(index) {
        var theHref     = $(this).attr('href'),
            hasHref     = (typeof theHref !== undefined),
            noUtm       = $(this).attr('no-utm'),
            utmTerm     = $(this).data('utmterm'),
            hasHash     = false,
            trackingTail;

        if (hasHref) {
            hasHash = (theHref.indexOf('?') > 0);
        }
        if (noUtm !== undefined) {
            return;
        }

        utmTerm      = (utmTerm === undefined) ? utmDate : utmTerm +'-'+ utmDate;
        trackingTail = getTrackingTail(utmCampaign, utmTerm, hasHash);
        theHref     += trackingTail;

        $(this).attr('href', theHref);
    });
});
	<html>
	<head>
	( ... )
	</head>
	<body data-utmcampaing="my-campaing" data-utmdate="20151105">

	<a href="http://some-address-to-go.com" data-utmterm="the_term">Some link</a>
	<a href="http://some-address-to-go.com?with=query" data-utmterm="the_term">Some link with querystring</a>
	<a href="http://some-address-to-go.com" no-utm>Some link not trackable</a>

	</body>
	</html>
	$(function() {

	var utmCampaign = $('body').data('utmcampaign'),
	utmDate = $('body').data('utmdate');

	var getTrackingTail = function(utmCampaign, utmTerm, hasHash) {

	if (typeof hasHash === undefined) {
	hasHash = false;
	}
	var trackingTail = (hasHash) ? '&' : '?';
	trackingTail += 'utm_medium=' + 'the_medium';
	trackingTail += '&utm_source=' + 'the_source';
	trackingTail += '&utm_content=' + 'the_content';
	trackingTail += '&utm_campaign=' + utmCampaign;
	trackingTail += '&utm_term=' + utmTerm;

	return trackingTail;
	};

	$('a').each(function(index) {
	var theHref = $(this).attr('href'),
	hasHref = (typeof theHref !== undefined),
	noUtm = $(this).attr('no-utm'),
	utmTerm = $(this).data('utmterm'),
	hasHash = false,
	trackingTail;

	if (hasHref) {
	hasHash = (theHref.indexOf('?') > 0);
	}
	if (noUtm !== undefined) {
	return;
	}

	utmTerm = (utmTerm === undefined) ? utmDate : utmTerm +'-'+ utmDate;
	trackingTail = getTrackingTail(utmCampaign, utmTerm, hasHash);
	theHref += trackingTail;

	$(this).attr('href', theHref);
	});
	});