Create app.py

app.py

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+import streamlit as st
+from streamlit.components.v1 import html
+
+def main():
+    st.title("Copy Text Demo")
+    st.write("This demo shows how to copy text from an HTML textarea into Streamlit.")
+    
+    # HTML component with textarea and copy button
+    html_code = """
+    <textarea id="myTextarea" rows="5" style="width: 100%; padding: 10px; margin: 10px 0;">Here is some sample text that you can copy.
+Try modifying this text and clicking the Copy button below!</textarea>
+    
+    <button onclick="copyToStreamlit()" style="padding: 8px 16px; background-color: #ff4b4b; color: white; border: none; border-radius: 4px; cursor: pointer;">
+        Copy to Streamlit
+    </button>
+
+    <script>
+    function copyToStreamlit() {
+        const text = document.getElementById('myTextarea').value;
+        window.parent.postMessage({
+            type: 'streamlit:message',
+            data: {
+                type: 'copyText',
+                text: text
+            }
+        }, '*');
+    }
+
+    // Listen for messages from Streamlit
+    window.addEventListener('message', function(event) {
+        if (event.data.type === 'streamlit:render') {
+            // Component has been re-rendered
+            console.log('Component rendered');
+        }
+    });
+    </script>
+    """
+
+    # Create a placeholder for the copied text
+    if 'copied_text' not in st.session_state:
+        st.session_state.copied_text = None
+
+    # Render HTML component
+    html(html_code, height=200)
+
+    # JavaScript message handler
+    st.markdown("""
+    <script>
+    window.addEventListener('message', function(event) {
+        if (event.data.type === 'copyText') {
+            const text = event.data.text;
+            window.streamlitMessageListener.handleMessage({
+                type: 'streamlit:setComponentValue',
+                value: text
+            });
+        }
+    });
+    </script>
+    """, unsafe_allow_html=True)
+
+    # Display copied text in a code block if available
+    if st.session_state.copied_text:
+        st.subheader("Copied Text:")
+        st.code(st.session_state.copied_text, language='text')
+
+if __name__ == "__main__":
+    main()