How to Build Custom Hooks in Odoo 18 Using OWL Framework

Building Custom Hooks in Odoo 18 Using the OWL Framework

Introduction

Odoo Consultation services often require deep customization to meet specific business needs. In Odoo 18, the frontend architecture is powered by the OWL (Odoo Web Library) framework, which introduces a reactive programming model and modular approach. One of the most powerful features of OWL is hooks, which simplify code reuse and manage state across UI components efficiently.

In this guide, you'll learn how to create a custom hook tailored to your functional requirements. Whether you're extending system behavior or building UI enhancements, this walkthrough provides a structured approach to implementing hooks in Odoo 18.

Creating a Custom Hook

Lets begin by developing a reusable hook that tracks the cursor position in real time.

pointer_tracker.js

/** @odoo-module **/
import { useState, onWillDestroy } from "@odoo/owl";

// Hook to track cursor coordinates
export function cursorTracker() {
    const coordinates = useState({ x: 0, y: 0 });

    function refreshPosition(e) {
        coordinates.x = e.clientX;
        coordinates.y = e.clientY;
    }

    window.addEventListener("mousemove", refreshPosition);

    onWillDestroy(() => {
        window.removeEventListener("mousemove", refreshPosition);
    });

    return coordinates;
}

This hook uses OWLs built-in useState for reactive data and onWillDestroy to clean up listeners when the component is removed. It continuously tracks mouse movement and updates the coordinates accordingly.

Module Structure for the Utility Hook

To integrate this functionality into Odoo, place the hook inside a utility module with the following structure:

cursor_utility/
??? __init__.py
??? __manifest__.py
??? static/
    ??? src/
        ??? js/
            ??? pointer_tracker.js

Once the module is installed, the hook becomes available for use in any OWL-based component.

Using the Hook in the System Menu

To see the hook in action, well create a visual component that displays the current cursor coordinates in the system menu.

cursor_display.xml

This template renders a simple UI element showing the cursors x and y coordinates.

cursor_display.js

/** @odoo-module **/
import { registry } from "@web/core/registry";
import { cursorTracker } from "@cursor_utility/js/pointer_tracker";
import { Component } from "@odoo/owl";

class PositionIndicator extends Component {
    static template = "cursor_display.PositionIndicator";

    setup() {
        this.pointerPosition = cursorTracker();
    }
}

export const menuPositionItem = {
    Component: PositionIndicator,
    sequence: 25, // Controls display order in the system menu
};

registry.category('systray').add('cursor_position', menuPositionItem);

This component integrates with the Odoo system menu using the systray registry. The cursorTracker() hook is used to dynamically bind cursor coordinates to the UI.

Implementation Module Structure

Place the display logic in a separate module to maintain modularity:

cursor_display/
??? __init__.py
??? __manifest__.py
??? static/
    ??? src/
        ??? js/
        ?   ??? cursor_display.js
        ??? xml/
            ??? cursor_display.xml

After installing both cursor_utility and cursor_display modules, users will see real-time cursor positions in the top system menu of Odoo.

Conclusion

Custom hooks in Odoo 18, enabled by the OWL framework, allow developers to create interactive and modular UI components with minimal overhead. Through clean state management and lifecycle control, hooks support flexible extension of user interfaces.

Whether you're working on frontend customizations as part of an Odoo Consultation project or enhancing your own instance, mastering hooks gives you a robust toolset for building responsive, maintainable features in Odoo 18.

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