Showcasing the template dynamically in Angular directive as the scope changes

Provided below is my custom directive:

function ajaxMessageData()
{
    var ajaxMessage = {
        link: link,
        restrict: "EA",
        template: "success",
        scope: {
            success: '='
        }
    };

    return ajaxMessage;

    function link(scope, elm, attrs)
    {

            console.log(scope.success);
            scope.$watch(attrs.success, function (newValue) {
                console.log("Changed to " + newValue);
            });

    }
}

When using it in HTML:

<ajax-message success="vm.message"></ajax-message>

The issue I am facing is related to the scope within the directive. Initially, I can retrieve the message from vm.message (which is a variable in my controller), but when vm.message changes, it is not being detected within the directive. Additionally, I would like the template to only display if I receive a success message from vm.success. Does anyone have any suggestions on how to resolve this? Thank you.

javascriptangularjs

Answer №1

  1. Make sure to pass an expression, not the value of the attrs object, when using $watch.
  2. Control visibility with the ng-if directive.
  3. Consider adding a curly binding like "{{ success }}" in the success template.

For instance:

myApp.directive('ajaxMessage', function() {

  return {
    restrict: 'EA',
    scope: {
      success: '='
    },

    // Customize the template accordingly -- note that ng-if only displays the element if success has a value
    // Remember to use curly braces for bindings

    template: "<div ng-if=\"success\" class=\"alert alert-info\">{{ success }}</div>",

    link: function($scope, $element, $attrs) {

      // Watch the $scope.success variable, not $attrs.success

      $scope.$watch('success', function(value) {
        console.log('Success value:', value);  
      });
    }
  };

});

... or see this plunker example for reference.

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