Angular 1.x: Non-destructive Save-on-Blur Directive

save-on-blur.coffee

.directive 'saveOnBlur', [
    '$timeout'
    ($timeout)->

        INPUT_SELECTOR = 'input, select, textarea'
        IGNORE_SELECTOR = '.ignore-save-on-blur, .nx-save-ignore, .ignore-save, .save-ignore'

        dir =
            require: '^form'
            restrict: 'A'

            link: ($scope, elem, attrs, formCtrl)->
                changingEvt = attrs.changingEvent or 'nx.viewData.changing'
                saveExp = attrs.saveOnBlur
                setLater = []

                elem ready ->                   
                    elem.find(INPUT_SELECTOR).not(IGNORE_SELECTOR).bind 'blur', (evt)->
                        if formCtrl.$dirty and formCtrl.$valid
                            input = angular.element evt.target
                            ngModel = input?.controller 'ngModel'
    
                            $off_changing = $scope.$on changingEvt, ->
                                console.log 'on nx.viewData.changing'
    
                                dirty = formCtrl.modifiedModels.slice()
                                for ngm in dirty
                                    if ngm isnt ngModel
                                        setLater.push { model:ngm, value:ngm.$viewValue }
    
                                $off_changing()
    
                            $scope.$eval saveExp
                            .then ->
                                console.log 'rsp received, $setPristine called'
                                #                            dirty = formCtrl.modifiedModels.slice()
                                formCtrl.$setPristine()
    
                                $timeout ->
                                    kvs = setLater.slice()
                                    for kv in kvs
                                        ngm = kv.model
                                        ngm.$setViewValue kv.value
                                        ngm.$render()
                                        ngm.$setDirty()
    
                                        _.pull setLater, kv
    
                        else
                            console.log 'save-on-blur didn\'t save'
]