textField input & auto calculated text in flutter

[Samer Jallad]

good morning i have an issue & I will be appreciated if someone can help me

I started Flutter recently because i need to make an IOS copy from already lunched App on android using Java... the aim is to make 3 textFields which allow the user from entering the text & at the same time it will do simple math calculation... for example if textField1 & textField2 entered the summation of 1 & 2 will be shown in textField3, the user can keep the value and use it or re-type it, the same should happen for textField1&textField3, the result will be displayed in textField2... so I tried several time to do so, but I have some issues that once summation is entered in textField3 i can't change it...also i can't apply the first step to the second case..

 my code is attached & I really appreciate any help or hint to solve this issue

[Suzuki Tomohiro]

key: Key(totalCalculated()),

This is strange. I’ve never seen a key calculated by a function. Would you explain what you want by this line?

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[Samer Jallad]

Hi, 

And thanks for replying, I put the key to keep monitoring the changes in the controller... Whenever I remove the key related to the function the APP stop updating the textField(maybe I am doing it wrong) 

The perpose of my app is to create input text Feilds to allow the user to input data in the same time in the same fields it will give calculation as a guide line for the values to be entered.... The same was done using Java 

Thanks again and regards, 

Sent from my Huawei phone

[Suzuki Tomohiro]

The statement “Whenever I remove the key related to the function the APP stop updating the textField” does not explain how/why it works. Would you elaborate a bit more?

This code below is also strange.

int.parse(velocityEditingController.toString())

Maybe you want

int.parse(velocityEditingController.text())

[Samer Jallad]

Dear All, I almost solved the issue but still I have one thing which still making a problem for me. the issue is how can I disable/remove the control listener for a textField in flutter, I am using 3 textField connected with a simple math.. (textField1 + textField2 = textField3) & (textField1 - textField3 = textField2)... I need to change the value of textField3 & keep the value of textField2 unchanged?. this is the current situation... also the code is attached ... please need help & thanks

[Suzuki Tomohiro]

> how can I disable/remove the control listener for a textField in flutter

Use removeListener.

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[Samer Jallad]

Thanks I will try