Undefined name 'context' in fuction

Question

I defined a showSnackBarr() function in any separate dart file and used in other dart file but showing red line under this stared ** context.

showSnackBar( **context** , e.toString);

showSnackBar(BuildContext context, String text) {
  return ScaffoldMessenger.of(context).showSnackBar(SnackBar(
    content: Text(text),
  ));
}

on FirebaseAuthException catch(e){

      showSnackBar(context, e.message!);
      res = false;
}

can you add the widget from where you are calling `showSnackBar( context , e.toString);`? — Sujan Gainju, May 26 '22 at 11:52

score 2 · Accepted Answer · answered May 26 '22 at 12:06

2

There is no variable/instance member called context where you're invoking your function. Generally, context is available as a property in State objects. An instance of BuildContext is also passed into the build method of Widgets.

More on BuildContext.

answered May 26 '22 at 12:06

Riwen

4,734
2
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I did this that I intialize a variable into class add it is working final ```BuildContext context ; AuthMethods({required this.context });``` Thank you so much Sir!! – Arjit Bhamu May 26 '22 at 12:35

Sujan Gainju · Answer 2 · 2022-05-26T12:12:15.740

1

Seems like you are trying to show the snackbar from the function outside of the widget.

For that, you have to pass the BuildContext to the function along with any parameters.

Example:

void myFunc(BuildContext context, dynamic data){
    try{
        // perform operation
    }
    catch(e){
        showSnackBar(context, e.message!);
    }
}

and call the function from the widget as

myFunc(context, "any data");

OR

you can use global context if you do not want to pass the build context each time.

edited May 26 '22 at 12:12

answered May 26 '22 at 12:07

Sujan Gainju

4,273
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34

If I use this method then red line transfer myFuc(context, "any data"); – Arjit Bhamu May 26 '22 at 12:25
you should call the myFuc(context, "any data"); from your widget – Sujan Gainju May 26 '22 at 12:26
I did this that I intialize a variable into class add it is working final ```BuildContext context ; AuthMethods({required this.context });``` – Arjit Bhamu May 26 '22 at 12:34

score 0 · Answer 3 · answered May 26 '22 at 12:37

0

I did this that I intialize a variable into the class where I using this function it is working final BuildContext context ; AuthMethods({required this.context });

And make a constructor.

answered May 26 '22 at 12:37

Arjit Bhamu

63
9

Undefined name 'context' in fuction

3 Answers3