javascript - Find out if radio option is checked before it was clicked -

i have following radio group.

<input type="radio" name="group1" ng-checked="true" ng-model="group1" id="name1" value="one"> <input type="radio" name="group1" ng-checked="false" ng-model="group1" id="name2" value="two"> <input type="radio" name="group1" ng-checked="false" ng-model="group1" id="name3" value="three"> 

when radio input clicked, want able figure out if, before clicked, if active or not.

for example, if clicked on #name1, respond true because checked.

if clicked on #name3, respond false because #name1 selected. if click on #name3 again, return true.

could me this?

you can watch code in controller. now, whenever model changed(in ui or in controller), event raised.

$scope.$watch('group1', function (newvalue, oldvalue) {    //place code here ...    // have access old , new value }); 

just information, try use @ least watches can...