Код скрипта для Яндекс.Метрики

(function () {
  function ChangeLinkWA() {
    this.cookieSource = ["_ym_uid"];
    this.observer = null;
  }

  ChangeLinkWA.prototype.replaceQueryParam = function (url, value) {
    if (!/{wz_metric}/gi.test(url)) return false;
    var explodedUrl = url.split("?");
    var baseUrl = explodedUrl[0] || "";
    var query = explodedUrl[1] ? explodedUrl[1].split("&") : [];
    if (!query.length) return false;
    var regex = new RegExp("^text=");
    var newLink = baseUrl + (query.length ? "?" : "");

    query.forEach(function (params, index) {
      var par = "";
      if (regex.test(params)) {
        par = params.replace(/{wz_metric}/gi, value);
      }

      newLink += (par ? par : params) + (index === query.length - 1 ? "" : "&");
    });

    return newLink;
  };

  ChangeLinkWA.prototype.getCookie = function (name) {
    let matches = document.cookie.match(
      new RegExp(
        "(?:^|; )" +
          name.replace(/([\.$?*|{}\(\)\[\]\\\/\+^])/g, "\\$1") +
          "=([^;]*)"
      )
    );
    return matches ? decodeURIComponent(matches[1]) : undefined;
  };

  ChangeLinkWA.prototype.addIdToLinks = function (that) {
    var linkElements = document.querySelectorAll(
      '[href*="//wa.me"], [href*="//api.whatsapp.com/send"], [href*="//web.whatsapp.com/send"], [href^="whatsapp://send"]'
    );

    var id = "";

    that.cookieSource.forEach(function (cook) {
      if (id) return;
      id = that.getCookie(cook);
    });

    for (var elementKey in linkElements) {
      if (linkElements.hasOwnProperty(elementKey)) {
        var element = linkElements[elementKey];
        var changeLink = that.replaceQueryParam(element.href, id);
        if (changeLink) element.href = changeLink;
      }
    }
  };

  ChangeLinkWA.prototype.initObserver = function () {
    var that = this;
    this.observer = new MutationObserver(function () {
      that.addIdToLinks(that);
    });
  };

  ChangeLinkWA.prototype.startObserver = function () {
    this.observer.observe(document.body, {
      attributeFilter: ["href"],
      attributes: true,
      childList: true,
      attributeOldValue: true,
      characterDataOldValue: true,
      characterData: true,
      subtree: true,
    });
  };

  ChangeLinkWA.prototype.init = function () {
    this.initObserver();
    this.startObserver();
  };

  if (!(window.__wz_scripts && window.__wz_scripts.scriptsChangeLinkWA)) {
    if (!window.__wz_scripts) {
      window.__wz_scripts = {};
    }
    window.__wz_scripts.scriptsChangeLinkWA = new ChangeLinkWA();
    window.__wz_scripts.scriptsChangeLinkWA.init();
  }
})();

(function () {

function ChangeLinkWA() {

this.cookieSource = ["_ym_uid"];

this.observer = null;

}

ChangeLinkWA.prototype.replaceQueryParam = function (url, value) {

if (!/{wz_metric}/gi.test(url)) return false;

var explodedUrl = url.split("?");

var baseUrl = explodedUrl[0] || "";

var query = explodedUrl[1] ? explodedUrl[1].split("&") : [];

if (!query.length) return false;

var regex = new RegExp("^text=");

var newLink = baseUrl + (query.length ? "?" : "");

query.forEach(function (params, index) {

var par = "";

if (regex.test(params)) {

par = params.replace(/{wz_metric}/gi, value);

}

newLink += (par ? par : params) + (index === query.length - 1 ? "" : "&");

});

return newLink;

};

ChangeLinkWA.prototype.getCookie = function (name) {

let matches = document.cookie.match(

new RegExp(

"(?:^|; )" +

name.replace(/([\.$?*|{}\[\]\\\/\+^])/g, "\\$1") +

"=([^;]*)"

)

);

return matches ? decodeURIComponent(matches[1]) : undefined;

};

ChangeLinkWA.prototype.addIdToLinks = function (that) {

var linkElements = document.querySelectorAll(

'[href*="//wa.me"], [href*="//api.whatsapp.com/send"], [href*="//web.whatsapp.com/send"], [href^="whatsapp://send"]'

);

var id = "";

that.cookieSource.forEach(function (cook) {

if (id) return;

id = that.getCookie(cook);

});

for (var elementKey in linkElements) {

if (linkElements.hasOwnProperty(elementKey)) {

var element = linkElements[elementKey];

var changeLink = that.replaceQueryParam(element.href, id);

if (changeLink) element.href = changeLink;

}

};

ChangeLinkWA.prototype.initObserver = function () {

var that = this;

this.observer = new MutationObserver(function () {

that.addIdToLinks(that);

});

};

ChangeLinkWA.prototype.startObserver = function () {

this.observer.observe(document.body, {

attributeFilter: ["href"],

attributes: true,

childList: true,

attributeOldValue: true,

characterDataOldValue: true,

characterData: true,

subtree: true,

});

};

ChangeLinkWA.prototype.init = function () {

this.initObserver();

this.startObserver();

};

if (!(window.__wz_scripts && window.__wz_scripts.scriptsChangeLinkWA)) {

if (!window.__wz_scripts) {

window.__wz_scripts = {};

}

window.__wz_scripts.scriptsChangeLinkWA = new ChangeLinkWA();

window.__wz_scripts.scriptsChangeLinkWA.init();

}

})();