Custom code and JavaScript bridge for Banners

When you use the Custom Code editor block in the Banner composer, you must call brazeBridge.logClick() from within your custom HTML to log clicks. Banners use the same JavaScript bridge as HTML in-app messages, so the same methods and patterns apply.

If you use custom HTML in your Banner design, the Braze SDK cannot automatically attach click listeners to elements inside your custom code. You must explicitly call brazeBridge.logClick() for any clickable elements (links, buttons, and similar) that you want to track in campaign analytics.

For example, to log a click when a user taps a button in your custom HTML:

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<button onclick="brazeBridge.logClick()">
  Click me
</button>

For the full JavaScript bridge reference, including all available methods and click tracking options, see the section below.

JavaScript bridge

Custom HTML in-app messages and Banners support a JavaScript “bridge” to interface with the Braze SDK, allowing you to trigger custom Braze actions when users click on elements with links or otherwise engage with your content. These methods exist with the global brazeBridge or appboyBridge variable.

For example, to log a custom attribute and custom event, then close the message, you could use the following JavaScript within your custom HTML:

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<button id="button">Set Favorite Color</button>
<script>
// Wait for the `brazeBridge` ready event, "ab.BridgeReady"
window.addEventListener("ab.BridgeReady", function(){
  // Event handler when the button is clicked
  document.querySelector("#button").onclick = function(){
    // Track Button 1 clicks for analytics
    // Note: This requires Android SDK v8.0.0, Web SDK v2.5.0, Swift SDK v5.4.0, and iOS SDK v3.23.0
    brazeBridge.logClick("0");
    // Set the user's custom attribute
    brazeBridge.getUser().setCustomUserAttribute("favorite color", "blue");
    // Track a custom event
    brazeBridge.logCustomEvent("completed survey");
    // Send the enqueued data to Braze
    brazeBridge.requestImmediateDataFlush();
    // Close the message
    brazeBridge.closeMessage();
  };
}, false);
</script>

JavaScript Bridge methods

The following JavaScript methods are supported within custom HTML for in-app messages and Banners:

Button click tracking

Use the brazeBridge.logClick(button_id) method to track clicks in your custom HTML.

For in-app messages, you can programmatically track “Button 1”, “Button 2”, and “Body Clicks” using brazeBridge.logClick('0'), brazeBridge.logClick('1'), or brazeBridge.logClick(), respectively.

For in-app messages, you can track multiple button click events per impression. For example, to close a message and log a Button 2 click:

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<a href="#" onclick="brazeBridge.logClick('1');brazeBridge.closeMessage()">✖</a>

You can also track new custom button names—up to 100 unique names per campaign. For example, brazeBridge.logClick('blue button') or brazeBridge.logClick('viewed carousel page 3').

Limitations (in-app messages only)

• You can have up to 100 unique button IDs per campaign.
• Button IDs can have up to 255 characters each.
• Button IDs can only include letters, numbers, spaces, dashes, and underscores.