Hey there 🙂
Im trying an ai tool atm and it gave a good answer to your question so I will share it^^

To sum the values of three input fields in FlutterFlow, you can implement real-time summing as the user enters values. This involves using variables, actions, and a simple formula.

Here's a step-by-step guide:

1. Create Variables for Each Input Field:

Go to your *Variables** panel (Page State or App State).

* Create a separate variable for each of your three input fields. For example, Input1Value, Input2Value, Input3Value.

Ensure these variables are of the type *Number** (e.g., Integer or Double) and set their initial value to 0 to prevent null errors.

2. Create a Variable for the Total Sum:

In the same *Variables** panel, create another variable to hold the total sum. For example, TotalSum.

Set its type to *Number** and its initial value to 0.

3. Set up a Trigger to Update the Sum (for each input field):

For *each of your three Text Input widgets**, select the widget in the UI Builder.

Go to the *Actions** tab in the properties panel.

Add an *Action** that triggers On Change. This action will fire every time the value in that specific input field changes.

4. Create an Action to Update the Sum Variable:

Inside the *On Change** event for each input field, add an Update Variable action.

* This action should update your TotalSum variable.

5. Define the Sum Formula:

* For the Update Variable action (which updates TotalSum), set the new value using a formula.

* The formula should add the values of all your input variables together. For example:

Input1Value + Input2Value + Input3Value

* FlutterFlow will automatically parse the text input values to numbers based on the variable types you set.

* Important Note: Each time a user enters or modifies the value in one of the fields, the On Change trigger on that specific input field will fire, causing the action to recalculate the TotalSum based on the current values of all input variables. This ensures the total updates in real-time.

6. Display the Result:

Add a *Text widget** or any other suitable output field to your page.

* Bind this widget's text property directly to your TotalSum variable.

* This will allow the user to see the total being updated instantly as they type in any of the three input fields.

This recommended method using On Change and state variables provides a smooth and functional solution for dynamic calculations based on user input.

local state text fields input sum