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When a visitor completes and submits your LanderLab quiz, you can fire a Meta Pixel Lead event at that exact moment. This is one of the most useful conversion signals you can send to Meta because it captures high-intent users who went through your entire quiz flow, not just people who landed on the page. This guide covers the full setup, how to verify it is working, and what to do if it is not.
Your landing page must already have the Meta Pixel base code installed before following this guide. If you have not done that yet, see Set Up Meta Pixel Integration first.

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How It Works

LanderLab fires a custom browser event called ll-quiz-submit every time a visitor submits the quiz. The code you will add in this guide listens for that event and tells Meta Pixel to track it as a Lead. The snippet also includes a guard (typeof fbq === "function") to prevent errors if the Pixel base code has not loaded yet.

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Setup

1

Open your quiz in LanderLab

Go to Landing Pages and click the name of the landing page that contains your quiz.Click Edit to open the quiz builder.
2

Open the JS Code tab

Inside the quiz builder, find and click JS Code.If there is any existing code in this field, delete it before pasting the new snippet. Having multiple listeners for the same event is the most common cause of the Lead firing twice.
3

Paste the Lead event snippet

Copy and paste the following code into the JS Code field:
    // Meta Pixel: fire Lead on quiz submit
    window.addEventListener("ll-quiz-submit", function () {
      if (typeof fbq === "function") {
        fbq("track", "Lead");
      }
    });
Do not wrap this code in <script> or </script> tags. The JS Code field only accepts plain JavaScript.
JS Code
4

Save and publish

Click Update in the top right corner to save your changes.Click Preview and complete the quiz yourself to test before going live. Once you have confirmed it is working, publish your page or funnel as usual.

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Verify the Lead Event Is Firing

Choose one of the following methods to confirm Meta Pixel is receiving the Lead event.
  1. Go to Meta Events Manager and select your Pixel.
  2. Click Test Events.
  3. Open your quiz page using the test link provided by Meta.
  4. Submit the quiz.
  5. Watch the Test Events panel for a Lead event. It may take a few seconds to appear.

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Troubleshooting

Check the following:
  • Meta Pixel base code is not installed. The fbq function must exist on the page before the snippet can call it. Complete the Meta Pixel setup if you have not already.
  • Script tags were included. The JS Code field does not accept HTML. Remove any <script> or </script> tags from the snippet.
  • Code is in the wrong place. Make sure the snippet is in the quiz builder’s JS Code tab, not in a page header or global script area.
This happens when the same listener is registered more than once. Check that the Lead snippet only exists in one place. Common sources of duplication:
  • The snippet is in both the quiz JS Code tab and the page header.
  • The same snippet was pasted twice inside the JS Code field.
  • A global script area on the page also contains the same listener.
Remove all duplicates and keep only the one instance inside the quiz JS Code tab.