Tips for accessing the scope bound to a template within a directive's link function

In HTML, I include an ID inside a directive:

<my-product data="id"></my-product>

In JavaScript:

angular.module('App', [])
.controller('Controller', ['$scope', function($scope) {
    $scope.id = 'productDiv';
}])
.directive('myProduct', function() {
    return {
        restrict: 'E',
        scope: {
            data: '='
        },
        template: '<div id="{{data}}"></div>',
        link: function(scope, element, attrs){
            console.log(document.getElementById('productDiv'));
        }
    };
});

The data is shown in the template, but the console shows undefined because the template hasn't been loaded with data. How can I access the DOM after the data has been loaded? Thank you!


Using scope.$watch solves the problem:

In HTML:

<my-product prop="id"></my-product>

In JavaScript:

angular.module('App', [])
.controller('Controller', ['$scope', function($scope) {
    $scope.id= 'productDiv';
}])
.directive('myProduct', function() {
    return {
        restrict: 'E',
        scope: {
            prop: '='
        },
        template: '<div id="{{prop}}"></div>',
        link: function(scope, element, attrs){
            scope.$watch('prop',function(){
                console.log(document.getElementById(prop)); //get the DOM
            });
        }
    };
});

Answer №1

You have the option to pass a value through scope.

In your template:

valueToPass="someValue"

In your directive:

scope: {
    valueToPass: '='
},
link: function(scope, element, attrs) {
    $watch('valueToPass', function() {
        element.attr('custom-attribute', scope.valueToPass);
    });
}

Answer №2

Avoid using the attribute data="" as it is a reserved attribute.

For more information on this, refer to https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Using_data_attributes.

Edit: The "data-" prefix will be removed from the attribute. To use it, you need to add an identifier for your code.

Therefore, if you modify your HTML to data-identifier="id"

and declare the scope in your directive like scope: { identifier: '=' }, everything should work correctly.

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