To exchange information between pages in Taipy and update the content of Page-DASHBOARD based on actions performed on Page-MAP, you can use a combination of state management and page navigation. Here’s a step-by-step approach to achieve this:

1. Define a State Variable

You need a shared state variable that can be accessed and modified across different pages. This variable will hold the information you want to pass between pages.

2. Update State on Page-MAP

In the Page-MAP page, update this state variable when a user clicks or performs an action. Use the on_change function to handle this event.

3. Use State in Page-DASHBOARD

In the Page-DASHBOARD page, access the updated state variable to dynamically update the content.

Here’s a detailed example:

1. Define a State Variable in main.py

from taipy import Taipy

# Initialize Taipy app
app = Taipy()

# Define shared state
state = {
    "shared_variable": None  # This will hold the data you want to pass
}

# Define pages
pages = {
    "/": root_md,
    "Page-MAP": page1_md,
    "Page-DASHBOARD": page2_md
}

2. Update State in Page-MAP

Define the on_change function to update the state variable and navigate to Page-DASHBOARD.

def on_change(state, var_name, var_value):
    # Update the shared state
    state["shared_variable"] = var_value  # Assign the value you want to pass
    # Navigate to Page-DASHBOARD
    navigate(state, to='Page-DASHBOARD')

Attach this function to the action (e.g., button click) on Page-MAP.

# Example button click action
button = Button("Click me", on_change=on_change)

3. Use State in Page-DASHBOARD

Access the shared state variable in Page-DASHBOARD and update the page content accordingly.

def page2_md(state):
    # Use the shared state variable
    shared_value = state["shared_variable"]
    
    # Update content based on the shared variable
    content = f"Received value: {shared_value}"
    
    return f"""
    <h1>Dashboard Page</h1>
    <p>{content}</p>
    """

Summary

1. Define a shared state variable in your main.py file.
2. Update this state variable on Page-MAP using the on_change function.
3. Access and use the state variable in Page-DASHBOARD to update the content.

This approach allows you to pass information between pages and dynamically update content based on user interactions.