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Pop-up and native banners: instructions for developers


To work with on-site personalization, first, they need to be set by the Meiro team:

1. Activation of the endpoint in the Meiro Events (ME) system should be implemented in order to collect events. 

2. Meiro Events API connection must be set in the Administration/Configurations/Settings tab. 

3. Channels/Web banners tabs must be enabled by the administrator for your user role.

4. For native banners, it is required to place a DOM element (or multiple elements) with the corresponding ID in the HTML code of the website where the banner will be displayed.


The evaluation of conditions for displaying banners and the insertion of the banner into the page (if any) happens during the MeiroEvents.track(“pageview”) function call.

If your website is a single-page application and you call this function manually, and if there are any cookie/local storage/GTM conditions, make sure that the relevant cookies, etc., are set before this tracking call.

The element containing the banner has a z-index value set to 1000000 (1 million). This includes the overlay (for banners with the position set to “middle”).

DOM containers for native banners

Native banners are associated with a container element ID/selector, which you assign in Meiro Business Explorer's native banner tab. You can either: 

  1. Assign a simple ID, e.g., some-container-id. In this case, Meiro Events will try to find an element with the given id attribute, e.g., <div id="some-container-id"> </div>, and display the banner in the first such element found.

  2. Use any valid CSS selector, e.g., .some-class or [data-containerid=”some-container-id”]. In this case, Meiro Events will use the native browser method document.querySelectorAll to find all matching elements and display the banner in all of them. 

To display a native banner on your website, insert a DOM element (or multiple elements) with the corresponding ID/matching the corresponding selector into the page.

It's important to acknowledge a known drawback: if the banner includes assets that need to be downloaded, such as images, they will be downloaded each time the banner is included on the webpage. This happens because caching mechanisms do not function via iframes.

Remember: Any existing content of the container element will be removed before the banner is inserted.

Remember: When a native banner is displayed in multiple elements via a CSS selector, the impression event is sent only once.

HTML banners

The HTML banners are inserted into an iframe element. This means that the CSS from the main page is inaccessible within the banner, and vice versa.

If you want to access the window object of the main page from within the banner HTML code, you can access it under window.parent, and you can access the Meiro Events SDK under window.parent.MeiroEvents.

The SDK exposes several methods that can be used inside the HTML banner code:

MeiroEvents.closePopUpWebBanner(): void
Closes the current pop up banner. Can be used if you implement your own close button.

MeiroEvents.getWebBannerHttpResponses(bannerId: string): Array<{ url: string, data: any }>

If the conditions for the banner include any HTTP request conditions, the responses will be stored in an array of objects. Each object will contain a URL property with the URL to which the request was made and a data property containing the parsed body of the response.

Remember: The order of the responses in the array is not guaranteed to be the same as the order of the conditions in the condition builder! Examine the URL to differentiate between multiple HTTP conditions.

Use the window.frameElement.getAttribute('data-bannerid') method to get the id to pass as an argument to getWebBannerHttpResponses.

MeiroEvents.goToWebBannerUrl(url: string, bannerId): void
Transitions user to the giver URL (if the meiro:bannerclick DOM event is not prevented) and tracks the web_banner_click event in Meiro Events. It also emits the meiro:bannerclick DOM event.

Get banner id from within the HTML banner code

SDK no longer supports obtaining banner id by its own interface because it’s no longer possible after the implementation of native banners. There can be several banners at the same time on the page, and it’s not obvious which one you may be asking for.
From now on, use the window.frameElement.getAttribute('data-bannerid') method to get banner id.

Cookie, local storage, and Google Tag Manager data type handling

The values retrieved from cookies/storage/GTM are handled in the following way for the purposes of condition evaluation:


The operators are yes and no.

For yes, the condition will pass if the value is true, 1, or any of the strings true, True, or 1.

Similarly, for no, the condition will pass if the value is false, 0, false, False, or 0.

DateTime / Relative DateTime

The value is passed as an argument to the JavaScript Date class constructor before comparing it with the provided value. If the result of the conversion is an invalid date, the condition will always fail.


Values retrieved from cookies and local storage are always retrieved as strings. If you store a JavaScript UNIX timestamp (number of milliseconds), this number will be retrieved as a string, and parsing to Date object will fail. Please make sure to store timestamps in cookies and local storage in a format that will be correctly parsed when passed to the Date constructor (i.e., new Date(timestamp)). We recommend the ISO format.


The value is converted to the JavaScript number type before comparison.


The value is converted to the JavaScript string type before comparison.

Display pop-up banner on any user interaction by ID

Display pop-up banner by ID on any user interaction by calling a special SDK method showPopUpWebBanner.


Web banner id can be found in the URL cdp.meiro.youracount/personalization/web-banners/id_is_here

e.g. for web banner URL https://cdp.meiro.your account/personalization/web-banners/eacf4043-ec65-4c30-939e-87c2ce19ac40

ID will be: eacf4043-ec65-4c30-939e-87c2ce19ac40

Remember: If a web banner has set the HTTP request trigger condition, the method getWebBannerHttpResponses will return an empty array as the request will not be executed. Keep it in mind when using response data in the banner. 

Capturing custom DOM events

The SDK triggers DOM events for each banner action, namely show, click (image banner only) and close. The events can be captured by implementing event listeners into your code:

document.addEventListener("meiro:bannershow", (event) => {...do whatever you want...})

Event names: meiro:bannershow, meiro:bannerclick, meiro:bannerclose

Each event holds banner data in the following structure, accessible under event.detail property:

  type: "show" | "click" | "close",
  bannerId: "some-banner-id",
  bannerName: "Some banner name",
  // url is present only in the meiro:bannerclick event
  url: "https://www.example.com"

The meiro:bannerclick event is followed by an immediate transition to the destination URL. If you want to perform some task before the transition (e.g. log the event into your own event-tracking system), call event.preventDefault() in your event listener; this will cancel the transition. When you're done, use event.detail.url property to make the transition manually.