I am applying the same code of below to my ionic 1 project :
However, when I selected country, corresponding option of state can’t be showed and have the below error :
ionic.bundle.js:26794 Error: [$injector:undef] Provider 'filterFilter' must return a value from $get factory method. http://errors.angularjs.org/1.5.3/$injector/undef?p0=filterFilter
error reference : https://docs.angularjs.org/error/$injector/undef?p0=filterFilter
May I know why did it happen ? Do I need to inject any filter or customise a filter if I want to use the basic filter function for ng-option in ionic1 ?