Client-Side Variables

Introduction to Client-Side Variables

Client-Side Variables in JENTIS are used to extract data directly from the user's browser at the time an interaction or event is triggered. These variables allow you to access real-time client-side information and feed it into your tracking configuration within the JENTIS Tag Manager.

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What Are Client-Side Variables?

Client-side variables run in the user’s browser and are executed at a specific predefined state (e.g., pageview, click, form interaction). They are especially useful for capturing information that only exists in the browser at runtime.

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Common Use Cases

Client-side variables are ideal for collecting browser-specific or session-specific data, including:

• User-Agent string

• Screen resolution, width, and height

• Current page URL or referrer

• Data attributes from HTML elements (e.g., data-product-id)

• Session or localStorage values

• Consent states and interactions

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Key Features

• Real-time browser data Retrieved at the exact moment a tag or trigger is executed.

• No dependency on server logic Runs purely in the browser, ensuring minimal delay.

• Execution Scopes Can be scoped to states like Pageview, Click, Change, etc.

• Synchronous and Asynchronous options Simple variables run synchronously; HTTP-based logic can be handled asynchronously.

How to Write a Client-Side Variable in JENTIS

To extract data from the browser, a client-side variable in JENTIS is based on a single JavaScript function. Here's a basic example that retrieves the full URL of the current webpage:

function window_location_href() {
    return window.location.href;
}

In the next section, we’ll introduce the available arguments provided by JENTIS, which are accessible within a client-side variable, as well as the public function scope available for use.