draft_gradio_update_example.py

import gradio as gr

# Function to validate the input and enable/disable the button
def validate_input(text):
    error_msg = ""
    button_state = False

    if len(text.strip()) < 3:
        error_msg = "_Input_ must be at least 3 characters."
        button_state = False
    else:
        button_state = True

    return gr.update(value=error_msg), gr.update(interactive=button_state)

# Function that runs when the button is clicked
def on_submit(text):
    return f"Processed: {text.strip()}"

with gr.Blocks() as demo:
    gr.Markdown("### Input Validation Example")

    inp = gr.Textbox(label="Enter something")
    validation = gr.Label(value="", visible=True)
    btn = gr.Button("Submit", interactive=False)
    out = gr.Textbox(label="Output", interactive=False)

    # When the input changes, validate it and enable/disable the button
    inp.change(validate_input, inputs=inp, outputs=[validation, btn])

    # When the button is clicked, process the input
    btn.click(on_submit, inputs=inp, outputs=out)

demo.launch()