better control flow

app.py

@@ -54,7 +54,7 @@ def compare():
     ))
     
     
-    st.plotly_chart(plx.scatter(
+    plot_placeholder.plotly_chart(plx.scatter(
         data_frame=df,
         x="x",
         y="y",
@@ -69,9 +69,13 @@ results = [result["_source"] for result in results["hits"]["hits"]]
 
 documents = {f"{result['title']} - {result['author']}": result['id'] for result in results}
 
-st.sidebar.title("Semantic compare")
+st.sidebar.header("Semantic compare")
 st.sidebar.write("Select documents from the SERICA library to semantically compare them. Hover above the data points to see the respective sentences")
 multiselect = st.sidebar.multiselect("Documents", list(documents.keys()))
 model = st.sidebar.selectbox("Model", ["LaBSE"])
 limit = st.sidebar.number_input("Sentences per document", 1000)
-st.sidebar.button("Compare", on_click=compare)
+
+plot_placeholder = st.empty()
+
+if st.sidebar.button("Compare"):
+    compare()