data-bind=“attr:{for:id()+'check'}” do not work for 2.3 android but work for 4.0+ android

Question

I am using phonegap, html 5,knockout to develop
Below code do not work for 2.3 android but work for 4.0+ android

<input type="checkbox" data-bind="checked: IsChecked,attr:{Id:id()+'check'}" class="checkBoxInput" />
                <label data-bind="attr:{for:id()+'check'}"></label>

May be a script error but none of the knockout data load after that.

Where as code below (hard-coded without ko) works

<input type="checkbox" id="test" class="checkBoxInput" />
                <label for="test"></label>

Answer 1

Thanks for your attention Edward van Raak

just small change, single quotes? 'for':id() and it work

<label data-bind="attr:{'for':id()+'check'}"></label>