Why pass a parameter to $uibModalInstance.close(parameter)?

Question

When calling $uibModalInstance.close(parameter) I understand that it closes the current modal window.

But what does the parameter inside the close() method do?

Answer 1

When you open a modal it will return an object with several promises, one of those promises is result, this promise will be resolved when you call close with the parameter given to it.

var modalInstance = $uibModal.open({
    controller: function($uibModalInstance) {
        $uibModalInstance.close('testParameter');
    }
});

modalInstance.result.then(function(parameter) {
    console.log(parameter); // logs 'testParameter'
});

A common pattern is to have a save/confirm button in your modal, and handling the result in the result success. To cancel the action (reject the result promise) you can call $uibModalinstance.dismiss(reason)