Adds a new front-end tutorial

docs/tutorials/articles/sales_dashboard/index.md

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+---
+title: Creating a Sales Dashboard
+category: fundamentals
+data-keywords: gui vizelement chart navbar table layout part menu state multi-page callback
+short-description: Understand basic knowledge of Taipy by creating a multi-page sales dashboard.
+order: 1.5
+img: sales_dashboard/images/thumbnail.png
+---
+
+!!! note "Supported Python versions"
+    Taipy requires **Python 3.9** or newer.
+
+This tutorial focuses on creating a simple sales dashboard application. You'll learn about visual elements,
+interaction, styling, and multi-page applications.
+
+![Final Application](images/final_app.png){width=90% .tp-image-border}
+
+This tutorial is also available in video format:
+
+<p align="center">
+  <a href="https://youtu.be/4F-266YnTkM" target="_blank">
+    <img src="images/yt-thumbnail.png" alt="Youtube Tutorial" width="50%"/>
+  </a>
+</p>
+
+### Installation
+
+Ensure you have Python 3.9 or newer, then install Taipy and Plotly:
+
+```bash
+pip install taipy plotly
+```
+
+!!! info
+    Use `pip install taipy` for the latest stable version. Need help with pip? Check out
+    the [installation guide](http://docs.python-guide.org/en/latest/starting/installation/).
+
+The dataset used in this tutorial is the 
+[SuperStore Sales dataset](https://www.kaggle.com/datasets/rohitsahoo/sales-forecasting) 
+available [here](https://github.com/AlexandreSajus/taipy-course/blob/main/data.csv).
+
+## Tutorial Steps
+
+1. [Visual Elements](step_01/step_01.md)
+2. [Styling](step_02/step_02.md)
+3. [Charts](step_03/step_03.md)
+4. [Multipage](step_04/step_04.md)

docs/tutorials/articles/sales_dashboard/step_01/step_01.md

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+---
+hide:
+  - toc
+---
+
+The full code for this step is available 
+[here](https://github.com/AlexandreSajus/taipy-course/blob/main/2_visual_elements/main.py)
+
+Let's start by creating a simple page with 3 components: a selector to select a category of items, 
+a bar chart which displays the sales of the top 10 countries for this category and 
+a table which displays data for the selected category
+
+![Step 1 Application](images/simple_app.png){ width=90% : .tp-image-border }
+
+Let's start by importing the necessary libraries:
+
+```python
+from taipy.gui import Gui
+import taipy.gui.builder as tgb
+import pandas as pd
+```
+
+We can now start creating the page. We will first add a [selector](../../../../refmans/gui/viselements/generic/selector.md).
+
+```python
+with tgb.Page() as page:
+    tgb.selector(value="{selected_category}", lov="{categories}", on_change=change_category)
+```
+
+Taipy [visual elements](../../../../refmans/gui/viselements/index.md) take many properties. 
+Note that dynamic properties use a quote and brackets syntax. We use `value="{selected_category}"` 
+to signal to Taipy that `selected_category` should change when the user uses the selector. 
+Likewise, if `categories` changes, the selector will get updated with the new values. 
+
+Here, selector needs an associated string variable which will change when a user selects a value, 
+a list of values (lov) to choose from, and a callback function to call when the value changes. 
+We can define them above:
+
+```python
+data = pd.read_csv("data.csv")
+selected_category = "Furniture"
+categories = list(data["Category"].unique())
+
+def change_category(state):
+    # Do nothing for now, we will implement this later
+    return None
+```
+
+We can now add a chart to display the sales of the top 10 countries for the selected category.
+
+```python
+    tgb.chart(
+        data="{chart_data}",
+        x="State",
+        y="Sales",
+        type="bar",
+        layout="{layout}",
+    )
+```
+
+Taipy charts have a specific syntax described [here](../../../../refmans/gui/viselements/generic/chart.md). You 
+can also directly embed Plotly charts using the `figure` property as we will do in [Step 3](../step_03/step_03.md).
+
+Here we need to provide a Pandas Dataframe with the data to display, the x and y columns to use, the type of chart,
+and a layout dictionary with additional properties.
+
+```python
+chart_data = (
+    data.groupby("State")["Sales"]
+    .sum()
+    .sort_values(ascending=False)
+    .head(10)
+    .reset_index()
+)
+
+layout = {"yaxis": {"title": "Revenue (USD)"}, "title": "Sales by State"}
+```
+
+Lastly, we can add a table to display the data for the selected category.
+
+```python
+    tgb.table(data="{data}")
+```
+
+We can now run the application using:
+
+```python
+Gui(page=page).run(title="Sales", dark_mode=False, debug=True)
+```
+
+`debug=True` will display a stack trace of the errors if any occur. 
+You can also set `use_reloader=True` to automatically reload the page 
+when you save changes to the code and `port=XXXX` to change the server port.
+
+The application runs but has no interaction. We need to code the callback function
+to update the chart and table when the user selects a category.
+
+```python
+def change_category(state):
+    state.data = data[data["Category"] == state.selected_category]
+    state.chart_data = (
+        state.data.groupby("State")["Sales"]
+        .sum()
+        .sort_values(ascending=False)
+        .head(10)
+        .reset_index()
+    )
+    state.layout = {
+        "yaxis": {"title": "Revenue (USD)"},
+        "title": f"Sales by State for {state.selected_category}",
+    }
+```
+
+Taipy uses a `state` object to store the variables per client.
+The syntax to update a variable will always be `state.variable = new_value`.

docs/tutorials/articles/sales_dashboard/step_02/step_02.md

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+---
+hide:
+  - toc
+---
+
+The full code for this step is available 
+[here](https://github.com/AlexandreSajus/taipy-course/tree/main/3_styling)
+
+This step will be about styling the application. We will add more filters, layout the visual element and 
+regroup them in parts.
+
+![Styling Application](images/styling_app.png){ width=90% : .tp-image-border }
+
+We can still use the same code as the previous step, but let's recreate the page from scratch:
+
+```python
+with tgb.Page() as page:
+    with tgb.part(class_name="container"):
+        tgb.text("# Sales by **State**", mode="md")
+```
+
+[Part](../../../../refmans/gui/viselements/generic/part.md) allows you to group and style visual elements together.
+Here, the [container](../../../../userman/gui/styling/stylekit.md) class is a predefined style
+that will limit the width of visual elements contained in the part.
+
+[Text](../../../../refmans/gui/viselements/generic/text.md) is a simple text visual element. Here we use the
+Markdown (md) mode to display a title and make the word "State". We can also color bold text in orange
+by using CSS. Create a new CSS file with the same name as the Python file and add the following code:
+
+```css
+strong,
+b {
+    font-weight: bold;
+    color: var(--color-primary);
+}
+```
+
+Let's now add a new container for the filters:
+
+```python
+        with tgb.part(class_name="card"):
+            with tgb.layout(columns="1 2 1"):
+                with tgb.part():
+                    tgb.text("Filter **From**", mode="md")
+                with tgb.part():
+                    tgb.text("Filter Product **Category**", mode="md")
+                with tgb.part(class_name="text-center"):
+                    tgb.button(
+                        "Apply",
+                    )
+```
+
+[Card](../../../../userman/gui/styling/stylekit.md) is a predefined style that will regroup visual elements in
+a white box. [layout](../../../../refmans/gui/viselements/generic/layout.md) allows you to create columns
+for visual elements. Here we create 3 columns with a ratio of 1:2:1, the second column will be twice as wide as the
+first and last columns. The contents of each column then needs to be separated in parts.
+
+![Layout](images/layout.png){ width=90% : .tp-image-border }
+
+We can now add [date selectors](../../../../refmans/gui/viselements/generic/date.md), 
+[selectors](../../../../refmans/gui/viselements/generic/selector.md) and a 
+[button](../../../../refmans/gui/viselements/generic/button.md) to apply the filters:
+
+```python
+        with tgb.part(class_name="card"):
+            with tgb.layout(columns="1 2 1"):
+                with tgb.part():
+                    tgb.text("Filter **From**", mode="md")
+                    tgb.date("{start_date}")
+                    tgb.text("To")
+                    tgb.date("{end_date}")
+                with tgb.part():
+                    tgb.text("Filter Product **Category**", mode="md")
+                    tgb.selector(
+                        value="{selected_category}",
+                        lov="{categories}",
+                        on_change=change_category,
+                        dropdown=True,
+                    )
+                    tgb.text("Filter Product **Subcategory**", mode="md")
+                    tgb.selector(
+                        value="{selected_subcategory}",
+                        lov="{subcategories}",
+                        dropdown=True,
+                    )
+                with tgb.part(class_name="text-center"):
+                    tgb.button(
+                        "Apply",
+                        class_name="plain apply_button",
+                        on_action=apply_changes,
+                    )
+```
+
+You'll notice we converted our selectors to dropdowns by setting the `dropdown` property to `True`.
+We also applied styling to the button: `plain` is a predefined style that colors the button in orange. 
+Predefined styles are available in visual elements documentation. 
+Check out the styling part of [button](../../../../refmans/gui/viselements/generic/button.md/).
+`apply_button` is a custom style that we can add using our CSS file:
+
+```css
+.apply_button {
+    margin-top: 158px;
+}
+```
+
+This will add a margin to the top of the button to align it with the filters.
+We can also add properties to all Taipy buttons by applying properties to the `taipy-button` class
+(You can find these class names by inspecting the page on a visual element)
+
+```css
+.taipy-button {
+    width: 60%
+}
+```
+
+![Filters](images/filters.png){ width=90% : .tp-image-border }
+
+We can now add the chart and the table:
+
+```python
+        tgb.html("br")
+        tgb.chart(
+            data="{chart_data}",
+            x="State",
+            y="Sales",
+            type="bar",
+            layout="{layout}",
+        )
+        tgb.html("br")
+        tgb.table(data="{data}")
+
+Gui(page=page).run(title="Sales", dark_mode=False, debug=True)
+
+```
+
+We use `tgb.html("br")` to add a line break and create space between elements.
+
+The last thing we need is to initialize the new variables and create the callback
+function to apply the filter:
+
+```python
+data = pd.read_csv("data.csv")
+chart_data = (
+    data.groupby("State")["Sales"]
+    .sum()
+    .sort_values(ascending=False)
+    .head(10)
+    .reset_index()
+)
+
+start_date = "2015-01-01"
+start_date = pd.to_datetime(start_date)
+end_date = "2018-12-31"
+end_date = pd.to_datetime(end_date)
+
+categories = list(data["Category"].unique())
+selected_category = "Furniture"
+
+selected_subcategory = "Bookcases"
+subcategories = list(
+    data[data["Category"] == selected_category]["Sub-Category"].unique()
+)
+
+layout = {"yaxis": {"title": "Revenue (USD)"}, "title": "Sales by State"}
+
+
+def change_category(state):
+    state.subcategories = list(
+        data[data["Category"] == state.selected_category]["Sub-Category"].unique()
+    )
+    state.selected_subcategory = state.subcategories[0]
+
+
+def apply_changes(state):
+    state.data = data[
+        (
+            pd.to_datetime(data["Order Date"], format="%d/%m/%Y")
+            >= pd.to_datetime(state.start_date)
+        )
+        & (
+            pd.to_datetime(data["Order Date"], format="%d/%m/%Y")
+            <= pd.to_datetime(state.end_date)
+        )
+    ]
+    state.data = state.data[state.data["Category"] == state.selected_category]
+    state.data = state.data[state.data["Sub-Category"] == state.selected_subcategory]
+    state.chart_data = (
+        state.data.groupby("State")["Sales"]
+        .sum()
+        .sort_values(ascending=False)
+        .head(10)
+        .reset_index()
+    )
+    state.layout = {
+        "yaxis": {"title": "Revenue (USD)"},
+        "title": f"Sales by State for {state.selected_category} - {state.selected_subcategory}",
+    }
+```