Navigating the complexities of custom directive attributes within Angular can be a daunting task

I'm feeling a bit lost as to why this isn't functioning properly...

Here's the directive I am working with:

app.directive('dateDropDowns', function () {

function link($scope, elem, attr) {

    console.log($scope.startYear);
};

function controller($scope, $attrs, $location) {

};

return {
    link: link,
    scope: {
        startYear: "&",
        endYear: "&",
        date: "=",
        required: "&"
    },
    restrict: "EA",
    templateUrl: "/scripts/templates/datedropdowns.html",
    controller: controller
}
});

This is the html for my directive:

 <div date-drop-downs start-year="startYear" end-year="endYear" required="true" date="testDate"></div>

The variables startYear, endYear, and testDate are all defined in the controller's scope where the above html resides.

The console.log within the link function is displaying:

 function (locals) {
              return parentGet(scope, locals);
            } 

However, the expected value for startYear should be 1910 as specified in the controller of the "date-drop-downs" directive.

I have attempted

console.log($scope.$eval($scope.startYear));
but it yields the same result as above

I also gave

console.log($scope.$eval(attr.startYear));
a shot, but it resulted in the same outcome

Lastly, console.log(attr.startYear); just returned the text "startMonth"

I'm uncertain on what steps to take next in order to retrieve the correct value for startYear.

Any assistance would be greatly valued.

Answer №1

When utilizing the & binding, non-function values are wrapped as functions to invoke a method in the parent scope.

Therefore, you should use:

$scope.startYear()

To retrieve the value of startYear. For two-way binding, use =, for text binding use @, and set the value as start-year="{{startYear}}" on the directive.

The & or &attr provides a way to execute an expression in the context of the parent scope. If no attribute name is specified, it's assumed that the attribute name is the same as the local name. In the case of { localFn:'&myAttr' }, the isolate scope property localFn will reference a function wrapper for the count = count + value expression. To pass data from isolated scope to parent scope via an expression, a map of local variable names and values can be passed into the expression wrapper function. For example, if the expression is increment(amount), we can specify the amount value by calling localFn({amount: 22}).

For one-time binding, you can use bindonce or with Angular 1.3 beta, utilize one-time binding syntax:

 .. start-year="{{::startYear}}" ...

and

 startYear: "@",

Plnkr

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