Title: Cookie Notice – Console error when returning empty string
Last modified: April 12, 2020

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# Cookie Notice – Console error when returning empty string

 *  [Dedalab](https://wordpress.org/support/users/francesco84x/)
 * (@francesco84x)
 * [6 years, 1 month ago](https://wordpress.org/support/topic/cookie-notice-console-error-when-returning-empty-string/)
 * Dear technical support,
 * I am doing some tests on my website in order to show/hide the Cookie Notice banner
   on specific pages. At present I have this piece of code inside my function.php
   file that should hide the Cookie Notice banner everywhere:
 *     ```
       function custom_cn_cookie_notice_output($output) {
       	if (true) {
       		$output = '';
       	}
       	return $output;
       }
   
       add_filter('cn_cookie_notice_output', 'custom_cn_cookie_notice_output');
       ```
   
 * It correctly blocks the visualization of the Cookie Notice banner everywhere 
   BUT…it also returns this in my Google Chrome console:
 * front.min.js:1 Uncaught TypeError: Cannot read property ‘classList’ of null
    
   at Object.init (front.min.js:1) at front.min.js:1
 * This is the front.min.js file:
 * `!function(){function e(e,t){t=t||{bubbles:!1,cancelable:!1,detail:void 0};var
   n=document.createEvent("CustomEvent");return n.initCustomEvent(e,t.bubbles,t.
   cancelable,t.detail),n}"function"!=typeof window.CustomEvent&&(e.prototype=window.
   Event.prototype,window.CustomEvent=e)}(),function(){function t(e){return new 
   RegExp("(^| )"+e+"( |$)")}function e(e,t,n){for(var i=0;i<e.length;i++)t.call(
   n,e[i])}function n(e){this.element=e}n.prototype={add:function(){e(arguments,
   function(e){this.contains(e)||(this.element.className+=0<this.element.className.
   length?" "+e:e)},this)},remove:function(){e(arguments,function(e){this.element.
   className=this.element.className.replace(t(e),"")},this)},toggle:function(e){
   return this.contains(e)?(this.remove(e),!1):(this.add(e),!0)},contains:function(
   e){return t(e).test(this.element.className)},replace:function(e,t){this.remove(
   e),this.add(t)}},"classList"in Element.prototype||Object.defineProperty(Element.
   prototype,"classList",{get:function(){return new n(this)}}),window.DOMTokenList&&
   null==DOMTokenList.prototype.replace&&(DOMTokenList.prototype.replace=n.prototype.
   replace)}(),function(a,r){var e=new function(){this.cookiesAccepted=null,this.
   noticeContainer=null,this.setStatus=function(e){var t=this;"1"===cnArgs.onScroll&&
   a.removeEventListener("scroll",this.handleScroll);var n=new Date,i=new Date;"
   accept"===e?(e="true",i.setTime(parseInt(n.getTime())+1e3*parseInt(cnArgs.cookieTime))):(
   e="false",i.setTime(parseInt(n.getTime())+1e3*parseInt(cnArgs.cookieTimeRejected))),
   r.cookie=cnArgs.cookieName+"="+e+";expires="+i.toUTCString()+";"+(cnArgs.cookieDomain?"
   domain="+cnArgs.cookieDomain+";":"")+(cnArgs.cookiePath?"path="+cnArgs.cookiePath
   +";":"")+("1"===cnArgs.secure?"secure;":""),this.cookiesAccepted="true"===e;var
   o=new CustomEvent("setCookieNotice",{detail:{value:e,time:n,expires:i,data:cnArgs}});
   if(r.dispatchEvent(o),this.setBodyClass(["cookies-set","true"===e?"cookies-accepted":"
   cookies-refused"]),this.hideCookieNotice(),"automatic"===cnArgs.revokeCookiesOpt&&(
   this.noticeContainer.addEventListener("animationend",function e(){t.noticeContainer.
   removeEventListener("animationend",e),t.showRevokeNotice()}),this.noticeContainer.
   addEventListener("webkitAnimationEnd",function e(){t.noticeContainer.removeEventListener("
   webkitAnimationEnd",e),t.showRevokeNotice()})),"1"===cnArgs.redirection&&("true"
   ===e&&null===this.cookiesAccepted||e!==this.cookiesAccepted&&null!==this.cookiesAccepted)){
   var s=a.location.protocol+"//",c=a.location.host+"/"+a.location.pathname;"1"=
   ==cnArgs.cache?(s=s+c.replace("//","/")+(""===a.location.search?"?":a.location.
   search+"&")+"cn-reloaded=1"+a.location.hash,a.location.href=s):(s=s+c.replace("//","/")
   +a.location.search+a.location.hash,a.location.reload(!0))}else;},this.getStatus
   =function(e){var t=("; "+r.cookie).split("; cookie_notice_accepted=");if(2!==
   t.length)return null;var n=t.pop().split(";").shift();return e?"true"===n:n},
   this.showCookieNotice=function(){var t=this,e=new CustomEvent("showCookieNotice",{
   detail:{data:cnArgs}});r.dispatchEvent(e),this.noticeContainer.classList.remove("
   cookie-notice-hidden"),this.noticeContainer.classList.add("cn-animated"),this.
   noticeContainer.classList.add("cookie-notice-visible"),this.noticeContainer.addEventListener("
   animationend",function e(){t.noticeContainer.removeEventListener("animationend",
   e),t.noticeContainer.classList.remove("cn-animated")}),this.noticeContainer.addEventListener("
   webkitAnimationEnd",function e(){t.noticeContainer.removeEventListener("webkitAnimationEnd",
   e),t.noticeContainer.classList.remove("cn-animated")})},this.hideCookieNotice
   =function(){var t=this,e=new CustomEvent("hideCookieNotice",{detail:{data:cnArgs}});
   r.dispatchEvent(e),this.noticeContainer.classList.add("cn-animated"),this.noticeContainer.
   classList.remove("cookie-notice-visible"),this.noticeContainer.addEventListener("
   animationend",function e(){t.noticeContainer.removeEventListener("animationend",
   e),t.noticeContainer.classList.remove("cn-animated"),t.noticeContainer.classList.
   add("cookie-notice-hidden")}),this.noticeContainer.addEventListener("webkitAnimationEnd",
   function e(){t.noticeContainer.removeEventListener("webkitAnimationEnd",e),t.
   noticeContainer.classList.remove("cn-animated"),t.noticeContainer.classList.add("
   cookie-notice-hidden")})},this.showRevokeNotice=function(){var t=this,e=new CustomEvent("
   showRevokeNotice",{detail:{data:cnArgs}});r.dispatchEvent(e),this.noticeContainer.
   classList.remove("cookie-revoke-hidden"),this.noticeContainer.classList.add("
   cn-animated"),this.noticeContainer.classList.add("cookie-revoke-visible"),this.
   noticeContainer.addEventListener("animationend",function e(){t.noticeContainer.
   removeEventListener("animationend",e),t.noticeContainer.classList.remove("cn-
   animated")}),this.noticeContainer.addEventListener("webkitAnimationEnd",function
   e(){t.noticeContainer.removeEventListener("webkitAnimationEnd",e),t.noticeContainer.
   classList.remove("cn-animated")})},this.hideRevokeNotice=function(){var t=this,
   e=new CustomEvent("hideRevokeNotice",{detail:{data:cnArgs}});r.dispatchEvent(
   e),this.noticeContainer.classList.add("cn-animated"),this.noticeContainer.classList.
   remove("cookie-revoke-visible"),this.noticeContainer.addEventListener("animationend",
   function e(){t.noticeContainer.removeEventListener("animationend",e),t.noticeContainer.
   classList.remove("cn-animated"),t.noticeContainer.classList.add("cookie-revoke-
   hidden")}),this.noticeContainer.addEventListener("webkitAnimationEnd",function
   e(){t.noticeContainer.removeEventListener("webkitAnimationEnd",e),t.noticeContainer.
   classList.remove("cn-animated"),t.noticeContainer.classList.add("cookie-revoke-
   hidden")})},this.setBodyClass=function(e){r.body.classList.remove("cookies-revoke"),
   r.body.classList.remove("cookies-accepted"),r.body.classList.remove("cookies-
   refused"),r.body.classList.remove("cookies-set"),r.body.classList.remove("cookies-
   not-set");for(var t=0;t<e.length;t++)r.body.classList.add(e[t])},this.handleScroll
   =function(){(a.pageYOffset||(r.documentElement||r.body.parentNode||r.body).scrollTop)
   >parseInt(cnArgs.onScrollOffset)&&this.setStatus("accept")},this.adjustOffset
   =function(){var e=r.getElementById("coronabar"),t=r.getElementById("wpadminbar"),
   n=0,i=0;"top"===cnArgs.position&&null!==t&&(i=t.offsetHeight,this.noticeContainer.
   style.top=i+"px"),null!==e&&(n=e.offsetHeight-1,"top"===cnArgs.position?(e.style.
   top=i+"px",this.noticeContainer.style.top=n+i+"px"):this.noticeContainer.style.
   bottom=n+"px")},this.getClosest=function(e,t){for(Element.prototype.matches||(
   Element.prototype.matches=Element.prototype.matchesSelector||Element.prototype.
   mozMatchesSelector||Element.prototype.msMatchesSelector||Element.prototype.oMatchesSelector
   ||Element.prototype.webkitMatchesSelector||function(e){for(var t=(this.document
   ||this.ownerDocument).querySelectorAll(e),n=t.length;0<=--n&&t.item(n)!==this;);
   return-1<n});e&&e!==r;e=e.parentNode)if(e.matches(t))return e;return null},this.
   init=function(){var t=this;this.cookiesAccepted=this.getStatus(!0),this.noticeContainer
   =r.getElementById("cookie-notice");var e=r.getElementsByClassName("cn-set-cookie"),
   n=r.getElementsByClassName("cn-revoke-cookie"),i=r.getElementById("cn-close-notice");
   this.noticeContainer.classList.add("cn-effect-"+cnArgs.hideEffect),t.adjustOffset(),
   a.addEventListener("resize",function(e){t.adjustOffset()}),"1"===cnArgs.coronabarActive&&(
   r.addEventListener("display.coronabar",function(e){t.adjustOffset()}),r.addEventListener("
   hide.coronabar",function(e){t.adjustOffset()}),r.addEventListener("saveData.coronabar",
   function(e){var t=e.detail;if(null!==t){var n=new XMLHttpRequest;n.open("POST",
   cnArgs.ajaxUrl,!0),n.setRequestHeader("Content-Type","application/x-www-form-
   urlencoded;"),n.onload=function(){200<=this.status&&this.status},n.onerror=function(){},
   n.send("action=cn_save_cases&nonce="+cnArgs.nonce+"&data="+JSON.stringify(t))}})),
   null===this.cookiesAccepted?("1"===cnArgs.onScroll&&a.addEventListener("scroll",
   function(e){t.handleScroll()}),"1"===cnArgs.onClick&&a.addEventListener("click",
   function(e){null===t.getClosest(e.target,"#cookie-notice")&&t.setStatus("accept")},!
   0),this.setBodyClass(["cookies-not-set"]),this.showCookieNotice()):(this.setBodyClass(["
   cookies-set",!0===this.cookiesAccepted?"cookies-accepted":"cookies-refused"]),"
   1"===cnArgs.revokeCookies&&"automatic"===cnArgs.revokeCookiesOpt&&this.showRevokeNotice());
   for(var o=0;o<e.length;o++)e[o].addEventListener("click",function(e){e.preventDefault(),
   e.stopPropagation(),t.setStatus(this.dataset.cookieSet)});"null"!==i&&i.addEventListener("
   click",function(e){e.preventDefault(),e.stopPropagation(),t.setStatus(this.dataset.
   cookieSet)});for(o=0;o<n.length;o++)n[o].addEventListener("click",function(e){
   e.preventDefault(),t.noticeContainer.classList.contains("cookie-revoke-visible")?(
   t.hideRevokeNotice(),t.noticeContainer.addEventListener("animationend",function
   e(){t.noticeContainer.removeEventListener("animationend",e),t.showCookieNotice()}),
   t.noticeContainer.addEventListener("webkitAnimationEnd",function e(){t.noticeContainer.
   removeEventListener("webkitAnimationEnd",e),t.showCookieNotice()})):t.noticeContainer.
   classList.contains("cookie-notice-hidden")&&t.noticeContainer.classList.contains("
   cookie-revoke-hidden")&&t.showCookieNotice()})}};a.addEventListener("load",function(){
   e.init()},!1)}(window,document);`
 * How can I solve
 * Thanks in advance guys,
    Francesco
    -  This topic was modified 6 years, 1 month ago by [Dedalab](https://wordpress.org/support/users/francesco84x/).

The topic ‘Cookie Notice – Console error when returning empty string’ is closed 
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 * 0 replies
 * 1 participant
 * Last reply from: [Dedalab](https://wordpress.org/support/users/francesco84x/)
 * Last activity: [6 years, 1 month ago](https://wordpress.org/support/topic/cookie-notice-console-error-when-returning-empty-string/)
 * Status: not resolved