Observing attribute changes in AngularJS directives

How can AngularJS observe attributes on a custom directive to bind Angular values?

Here is my current progress:

<tile title="Sleep Duration" data-value="{{sleepHistory.averageSleepTime}}"/>

app.directive('tile', [function() {
    return {
        restrict: 'E',
        link: function(scope, element, attrs) {
            var title = attrs.title;

            attrs.$observe('dataValue', function(val) {
                var data = val;

                console.log(data);

                var dom =
                    "<div>" +
                    "<p>" + title + "</p>" +
                    "<p>" + data + "</p>" +
                    "</div";

                $(element).append($(dom.trim()));
            });
        }
    };
}]);

However, the observed value is returning as undefined

Answer №1

According to https://docs.angularjs.org/api/ng/type/$compile.directive.Attributes:

All of these variations are considered equivalent in Angular:

<span ng:bind="a" ng-bind="a" data-ng-bind="a" x-ng-bind="a">

This means that the attribute data-value is normalized to value

Therefore, this is the correct usage:

attrs.$observe('value', function(val) {

Answer №2

Instead of focusing on dataValue, pay attention to the value itself.

attrs.$observe('value', function (val)  { ...

Answer №3

Instead of using data-value, you have the option to implement a new attribute in your directive:

<tile title="Sleep Duration"  your-custom-attribute={{sleepHistory.averageSleepTime}}" />

attrs.$observe('yourCustomAttribute', function (newValue, oldValue) {
    if (newValue && newValue !== oldValue) {
        // ...
    }
});

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