Add Plotly point selection example to gallery

examples/visualizations/plotly_selections/app.py

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+import plotly.express as px
+from fasthtml.common import *
+
+# Add the Plotly library to the headers
+app, rt = fast_app(hdrs=(Script(src="https://cdn.plot.ly/plotly-2.24.1.min.js"),))
+
+def create_scatter_plot():
+    # Create simple scatter plot with 5 points
+    fig = px.scatter(
+        x=[1, 2, 3, 4, 5], y=[2, 4, 1, 3, 5], labels={"x": "X Value", "y": "Y Value"}
+    )
+    return fig.to_json()
+
+@rt
+def index():
+    return Titled("Interactive Plotly Selection",
+        P("Click any point to see its x-value!"),
+        # point-info will be updated based on what is clicked
+        Div(id="point-info")(P("No point selected yet")),
+        # plotly-container will be updated with the plot
+        Div(id="plotly-container"),
+        # Initialize the plot
+        Script(
+            f"""
+            // All the plot data is given in json form by `create_scatter_plot`
+            const plotData = {create_scatter_plot()};
+            // Create the plot with that data in location with id `plotly-container`
+            Plotly.newPlot('plotly-container', plotData.data, plotData.layout);
+
+            // Add click event handler
+            // Get thing with id `plotly-container`, and on plotly_click event,
+            // run the function
+            document.getElementById('plotly-container').on('plotly_click', function(data) {{
+                // Get the first point clicked
+                const point = data.points[0];
+                // Make HTMX request when point is clicked with the x-value
+                htmx.ajax('GET', `point/${{point.x}}`, {{target: '#point-info'}});
+            }});
+            """
+            ))
+
+
+@rt("/point/{x_val}")
+def get(x_val: float):
+    # Return the x-value of the point clicked to the UI!
+    return P(Strong(f"You clicked the point with x-value: {x_val}"))
+
+serve()

examples/visualizations/plotly_selections/metadata.ini

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+[REQUIRED]
+ImageAltText=Interactive Plotly chart demonstrating point selection and dynamic updates using HTMX
+ComponentName=Interactive Plotly Selection
+ComponentDescription=Example showing how to create interactive Plotly charts that communicate with FastHTML routes when data points are selected, enabling dynamic updates and actions based on user selections