How can I make "select all" and "unselect all" buttons using Flutter?

Question

I have a "AlertDialog" with a Checklist (CheckboxListTile) and I wanted to add two buttons at the top. One with the option "Select All" and the other "Unselect All". How can I implement these two buttons that handles the state of all the items in the list?

It comes down to how do you handle each selected item, for example if you create an array of selected items, select all simply adds all items to selected_items array and unselect all will simply clear the selected items array — dlohani
– dlohani, Commented Sep 29, 2020 at 15:01

w461 · Accepted Answer · 2020-09-29 15:29:39Z

2

let's assume that you have loads of checkboxes and you assign a value to each of them

List<bool> checkBoxValues;

...

CheckBox(
  value: checkBoxValues[0] // or i if you automate this
)

Then you can easily set all values by

CupertinoButton(
  child: Text("check all"),
  onPressed: () {
    setState (() {
      for (var i = 0; I checkBoxValues.length < ; i++)
        checkBoxValues[i] = true;
    });
  },
)

answered Sep 29, 2020 at 15:29

w461

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2 Comments

Leonidas Yopan Over a year ago

Cool. I'll try that. Thanks

w461 Over a year ago

if this helped, accepting or upvoting the answer would be nice :-)

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