The functionality of Directive hinges on the use of a template

I am exploring a more web-component approach to using Angular. As part of this, I have developed an http-request directive with url and response attributes. The implementation is successful, but I find that my directive relies on a template unnecessarily. I would like to eliminate the template element as it seems unnecessary for the functionality of the directive. Below is the code snippet:

<div>
  <http-request url="http://jsonplaceholder.typicode.com/posts" response="items"></http-request>
  <ul>
    <li ng-repeat="item in items">{{ item.id }}</li>
  </ul>
</div>

var myApp = angular.module('myApp', []);

myApp.directive('httpRequest', ['$http', function ($http) {
return {
    restrict: 'E',
    replace: true,
    scope: {
        response: '='
    },
    template: '<input type="text" ng-model="response" style="display:none"/>',
    link: function (scope, element, attributes) {
        $http.get(attributes.url)
            .then(function (response) {
            scope.response = response.data;
        });
    }
}
}]);

Fiddle: http://jsfiddle.net/HB7LU/9558/

Answer №1

Revise your directive as follows:

myApp.directive('httpRequest', ['$http', function ($http) {
    return {
        restrict: 'E',
        replace: true,
        scope: {
            response: '='
        },
        link: function (scope, element, attributes) {
            //create response object if it doesn't exist
            scope.response = scope.response || {};
            $http.get(attributes.url)
                .then(function (response) {
                //write to items property of response object
                scope.response.items = response.data;
            });
        }
    }
}]);

Next, iterate over the response.items when using the directive:

<http-request url="http://jsonplaceholder.typicode.com/posts" response="response">
</http-request>
<ul>
    <li ng-repeat="item in response.items">{{ item.id }}</li>
</ul>

Updated example.

The original method (with the template inside the directive) was replacing the reference within the isolate scope with the $http data. This resulted in being bound to ng-model="response", which was then updated through two-way binding. Additionally, you are utilizing an outdated version of Angular. More recent versions eliminate the need for this workaround by simply removing the template.

Recent Angular example.

Update:

If you prefer not to bind to an items property, you can modify your directive like so (utilizing the $parse service to set the value on scope). This approach is compatible with older versions of Angular as well:

myApp.directive('httpRequest', ['$http', '$parse', function ($http, $parse) {
    return {
        restrict: 'E',
        replace: true,
        link: function (scope, element, attributes) {
            //use $parse to assign this value to scope
            var responseSetter = $parse(attributes.response).assign;
            $http.get(attributes.url)
                .then(function (response) {
                //call the "setter" against scope with the data
                responseSetter(scope, response.data);
            });
        }
    }
}]);

Demo.

Answer №2

Your directive doesn't necessarily need a template, as it is simply responsible for managing scope variables to represent the state of the request and reacting to the response status and data.

If you're interested, take a look at https://github.com/coding-js/directives/tree/solutions/datasource which was shared during a recent JavaScript meetup I helped organize.

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