/
source.js
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/
source.js
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(function () {
'use strict';
var w = window;
var d = w.document;
w._gaq = w._gaq || [];
w._gaq.push(function() {
var W3C = 'addEventListener';
var IE = 'attachEvent';
// crossdomain用
var whitelist = [
'google.co',
'gmail.co'
];
// eventtrack用
var eventTrackRoot = 'navbar';
function isMatch(whitelisted, linkHostname) {
if (!linkHostname) {
return;
}
return linkHostname.indexOf(whitelisted) >= 0;
}
function listen(obj, type, listener, opt_useCapture) {
if (obj['data-gtmListening']) {
return;
}
if (obj[W3C]) {
obj[W3C](type, listener, !!opt_useCapture)
} else if (obj[IE]) {
obj[IE]('on' + type, listener);
}
obj['data-gtmListening'] = true;
}
// クロスドメイントラッキングの対象であるかを検証
function isCrossDomain (link) {
var hn = link.hostname;
var i = 0, listLeng = whitelist.length;
var thisDomain = d.domain;
// 対象が空でなく且つ、ドメイン内遷移のリンクまたはハッシュではない場合に照合
if (hn !== '' && hn !== thisDomain) {
for (; i < listLeng; i++) {
if (isMatch(whitelist[i], hn)) {
return true;
}
}
}
return false;
}
// イベントトラックの対象であるかを検証
function isEventTrack (link) {
var elem = link;
var res = false;
while (elem) {
elem = elem.parentNode;
if (elem.className.match(eventTrackRoot)) {
res = true;
break;
}
}
return res;
}
function buildListener(checkGtmListening) {
return function(event) {
var link, txt;
event = event || window['event'];
link = event['target'] || event['srcElement'] || {};
if (
(checkGtmListening && link['data-gtmListening']) &&
String(link.tagName).toLowerCase() !== 'a'
) {
return;
}
// crossDomain対象である場合
if (isCrossDomain(link)) {
w.dataLayer.push({
event: 'cross_link',
targetUrl: link.href,
linkTarget: link.target
});
event.preventDefault && event.preventDefault();
event.returnValue = false;
return false;
} else if (isEventTrack(link)) {
txt = link.text || link.innerText || link.textContent;
w.dataLayer.push({
event: 'event_link',
action: 'click',
label: 'transition to ' + txt,
value: txt
});
return true;
}
};
}
// legacy IE
!d[W3C] && (function () {
var allLinks = d.getElementsByTagName('a');
var i = 0, linkLeng = allLinks.length;
var anc;
for (; i < linkLeng; i++) {
anc = allLinks[i];
if (isCrossDomain(anc)) {
listen(anc, 'click', buildListener(false));
}
}
}());
// delegateでdocument内のclickイベントをlistenする
listen(d, 'click', buildListener(true), true);
});
}());