I am using the similar button callback code as mentioned in the dash guide. But the problem I am facing is that the callback function is called automatically at the start , even when the button is not pressed. I need that function should only be called when the button is pressed.

Check if n_clicks==None and then raise dash.exceptions.PreventUpdate() Callbacks will always be fired at the start to keep everything consistent

Hi @chriddyp , how to stop the button keeping running? Once you click the button, the value won’t be None any more, I experience the callback feature based on the button keeps running again and again? Do we need to reset the n_clicks = 0 in the end of the callback function? I tried that too but it d…

The callbacks should only run “again and again” if you click the button again and again. Resetting n_clicks = 0 is usually not needed. Please share your code and elaborate the problem in detail.

Hi @MichelH , below is my callback function. when i am in the DataTable, it keeps adding the rows when I tabbed to next column to fill in values, and I didn’t keep clicking that add_row button. def add_update_row(add_row_clicks, timestamp, rows, columns): if add_row_clicks is None: rais…

Please also provide the decorator of your callback (i.e. the part that says @app.callback(...) before the function). Indeed setting add_row_clicks = 0 as you do in your function will not have any effect, as you are not returning that value, thus not actually setting the property of the button. I s…

Hi @MichelH - thanks for your kind help. The decorator is per below: @app.callback( Output('xxx-matrix-inputs', 'data'), Input('add-rows-button', 'n_clicks'), Input('xxx-matrix-inputs', 'data_timestamp'), State('xxx-matrix-inputs', 'data'), State('xxx-matrix-inputs', 'columns')…

Hi @MichelH - I have another question in this post, wondering if you know anything? Much appreciated! [image] What Operator can I use for NOT BLANK in String/Text type of DataTable Conditional Formatting? Dash Python Hi there, I am trying to set a conditional logic in D…

[image] XMan: any idea? Well, the second print shows that the seconds firing of the callback was not fired by the button, but by Input('xxx-matrix-inputs', 'data_timestamp'). This makes sense: The callback is triggered, it edits the data, which in turn updates data_timestamp, which fires the …

HI @MichelH : you brilliant! That is working perfectly now! Thank you so much!!

Callback function of button is called automatically

Dash Python

XMan August 5, 2021, 9:59am 8

Hi @MichelH - I have another question in this post, wondering if you know anything? Much appreciated!

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Callback function of button is called automatically

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