The directive is becoming unbound

Currently, I am facing an issue with my code. I have set up a fiddle that demonstrates a directive displaying an alert and also a controller with an alert function. Everything is functioning correctly except for the fact that the binding for the text on the button is being lost. Does anyone have any ideas or suggestions to help me troubleshoot this problem?

<div ng-app="directiveApp" ng-controller="MainController">
 <button ng-click="doStuff()" unsaved-warning-trigger>
    {{buttonText}}
 </button>
</div>

var app = angular.module("directiveApp", []);

app.directive('unsavedWarningTrigger',
    function() {
        return {
            priority: 1,
            terminal: true,
            link: function (scope, element, attr) {
                var clickAction = attr.ngClick;
                element.bind('click',function () {
                    if (window.confirm("Sure?")) {
                        scope.$eval(clickAction)
                    }
                });
            }
        };
    }
);

MainController = function($scope) {
  $scope.buttonText = 'bound button';

  $scope.doStuff = function () {
    alert("doing stuff");
  };
}

http://jsfiddle.net/9tWr7/3/

Answer №1

If you're experiencing issues with your directives, it may be due to setting the "terminal" property to "true". This can prevent subsequent directives from executing, even if they are not explicitly stated in your code.

Before using the 'terminal: true' property, consider reevaluating your requirements and whether it is truly necessary.

You might want to explore other scope approaches instead.

Check out this jsFiddle link where you can observe the binding without the 'terminal' property:

http://jsfiddle.net/RJq3N/

There's also a helpful post discussing the terminal and priority properties here:

How to understand the `terminal` of directive?

In order to achieve the full functionality you desire, consider structuring your directive like this:

app.directive('unsavedWarningTrigger',
    function() {
        return {
            priority: 1,
            terminal: true,
            link: function(scope, element, attr) {

                element.text(scope.buttonText);

                var clickAction = attr.ngClick;
                element.bind('click',function () {
                    if (window.confirm("Sure?")) {
                        scope.$eval(clickAction)
                    }
                });
            }
        };
    }
);

Here's another jsFiddle showcasing this implementation:

http://jsfiddle.net/KsT5f/

Note that with this setup, the button text is only set once during directive linking. If you require updates based on changes to the buttonText variable, you'll need to implement a $watch and update the element text accordingly.

Hope this helps!

Answer №2

'terminal: true' stops directives with a lower priority from running on the current element. However, it also prevents directives on child elements from being executed.

When Angular adds a directive for an {{expression}}, in this case to the text node inside a button element, that directive won't run due to terminal: true.

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