Modify the characteristic of a personalized directive

Question

Modify the characteristic of a personalized directive

I have created a unique directive that allows me to load pages within a specified div element.

.directive('page', function () {
    return {
        templateUrl: function (elem, attr) {
            return 'pages/page-' + attr.num + '.html';
        }
    };
});

Below is how the custom directive is represented in the DOM:

<div page num="{{pageNo}}"></div>

In this case, I am looking to dynamically change the page number from the controller.

The directive functions correctly when the value is hardcoded like so:

<div page num="1"></div>

javascript angularjs pagination angularjs-directive

Answer 1

Answer №1

If you need to access the interpolated value of pageNo within your directive, it's not possible to do so directly inside the templateUrl function. Instead, you can utilize the ng-include directive to retrieve the scope name value within your directive.

Example:

<div page num="{{pageNo}}"></div>

Directive Code:

app.directive('page', function() {
  return {
    scope: {
      num: '@'
    },
    template: '<div ng-include="\'pages/page-\'+ num + \'.html\'"></div>'
  };
});

View Working Plunker

Answer 2

If you need to access the interpolated value of pageNo within your directive, it's not possible to do so directly inside the templateUrl function. Instead, you can utilize the ng-include directive to retrieve the scope name value within your directive.

Example:

<div page num="{{pageNo}}"></div>

Directive Code:

app.directive('page', function() {
  return {
    scope: {
      num: '@'
    },
    template: '<div ng-include="\'pages/page-\'+ num + \'.html\'"></div>'
  };
});

View Working Plunker

Answer 3

Answer №2

According to information found in official documentation:

The templateUrl function does not have access to scope variables, as the template is requested before the scope is initialized.

This restriction means that only the literal value of the attribute can be accessed, and it cannot be evaluated against a specific scope. One potential workaround could involve defining the directive within a closure to access the parent scope for operations like calling scope.$eval('pageNumber').

However, resorting to this method may result in an inelegant solution. It might be preferable to follow @pankaj-parkar's suggestion of using ng-include instead.

Answer 4

According to information found in official documentation:

The templateUrl function does not have access to scope variables, as the template is requested before the scope is initialized.

This restriction means that only the literal value of the attribute can be accessed, and it cannot be evaluated against a specific scope. One potential workaround could involve defining the directive within a closure to access the parent scope for operations like calling scope.$eval('pageNumber').

However, resorting to this method may result in an inelegant solution. It might be preferable to follow @pankaj-parkar's suggestion of using ng-include instead.

Modify the characteristic of a personalized directive

Answer №1

Answer №2

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