if statement inside widget in flutter

Question

How do I create a loop or if-statement inside a widget in flutter? It seems that you only can make a single line condition like: if(condition) but if you try to use brackets: if(condition){ } it gives an error. The same thing happens whith loops.

I want to be able to:

    RichText(
     text: TextSpan(
     text: 'Logg\n',
     children: <TextSpan>[

         if(condition){

             TextSpan( text: 'Text1\n',),
             TextSpan( text: 'Text2\n',),
          }else{

           TextSpan( text: 'Text3\n',),
           TextSpan( text: 'Text4\n',),
          }
      ]
    )

Solution

Try as follows:

RichText(
        text: TextSpan(
            text: 'Logg\n',
            children: value == true
                ? [
                    const TextSpan(text: 'Text1\n'),
                    const TextSpan(text: 'Text2\n')
                  ]
                : [
                    const TextSpan(text: 'Text3\n'),
                    const TextSpan(text: 'Text4\n')
                  ]))

Comments

[Vraj Shah]

I think this is what you are looking for. stackoverflow.com/questions/49713189/…

[Ruchit]

Does this answer your question? How to use conditional statement within child attribute of a Flutter Widget (Center Widget)

[cueless]

yes i does! But what i not specified in my question is that i also want to know how to write a loop inside and i understand that should had specified that but i thought the answer would answer that question too, but now i understand i can not use brackets

[cueless]

ok thanks. So its not possible to add an if statment with brackets inside a widget? To for example use a loop inside one of the textspan that prints "Text1\n" and "Text2\n 10 times each.

[Kaleb]

yes curly brackets cant be used in widget tree

[Manishyadav]

I don't prefer this , but this is just a possibility if someone might like use it.