how to write if else statement with passed data in dart (flutter app)

Question

I am trying to write an if/else statement in dart on my flutter app. I am trying to see if the passed id is equal to 3 to return a whole page of code, and else would be a different page. for example...

 Widget build(BuildContext context) {
    final TextEditingController controller = new TextEditingController();
    String result = "";
    If (${widget.id} = 3){ 
        return Scaffold(
           all of scaffold 1)
       }; else {
          return Scaffold(
            all of scaffold 2)
       };

Do i need to set ${widget.id} to a variable to call into the if statement? And where would i set it in the .dart page, in void initstate(){}?

Richard Heap · Accepted Answer · 2018-08-16 14:16:57Z

3

The syntax would be:

Widget build(BuildContext context) {
  final TextEditingController controller = new TextEditingController();
  String result = "";
  if (widget.id == 3) {
    return Scaffold(/* version 1*/);
  } else {
    return Scaffold(/* version 2*/);
  }
}

id would be set in the constructor of the StatefulWidget - and should be final.

answered Aug 16, 2018 at 14:16

Richard Heap

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lrn · Accepted Answer · 2018-08-17 08:16:54Z

2

You can also do it like this

Using a ternary operator

Widget build(BuildContext context) {
 final TextEditingController controller = new TextEditingController();
 String result = "";
 return widget.id == 3 ? Scaffold(/*version 1*/) : Scaffold(/*version 2*/);
}

edited Aug 17, 2018 at 8:16

lrn

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answered Aug 16, 2018 at 15:40

Jaswant Singh

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