AngularJS脚本标记JSON-LD

Question

How do you create an application/ld+json script tag with a dynamically built JSON object in AngularJS .

This is what I need the script tag to look like

<script type="application/ld+json">
{
  "@context": "http://schema.org",
  "@type": "Place",
  "geo": {
    "@type": "GeoCoordinates",
    "latitude": "40.75",
    "longitude": "73.98"
  },
  "name": "Empire State Building"
}
</script>

I have tried the following code but I cant get it to work:

HTML

<div ng-controller="TestController">
  <script type="application/ld+json">
    {{jsonId|json}}
  </script>
  {{jsonId|json}}
</div>

Controller

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

myApp.controller('TestController', ['$scope', function($scope) {
  $scope.jsonId = {
    "@context": "http://schema.org",
    "@type": "Place",
    "geo": {
      "@type": "GeoCoordinates",
      "latitude": "40.75",
      "longitude": "73.98"
    },
    "name": "Empire State Building"
  };
}]);

The expression inside the script tag does not execute. The expression outside the script tag executes correctly and displays the JSON

Please see jsfiddle

Answer 1

After a cup of coffee I remembered there is a $sce service with a trustAsHtml function.

I created a directive that accepts a json parameter for easy re-use

Please see updated and working code below:

HTML

<div ng-controller="TestController">
  <jsonld data-json="jsonId"></jsonld>
</div>

Javascript

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

myApp.controller('TestController', ['$scope', function($scope) {
  $scope.jsonId = {
    "@context": "http://schema.org",
    "@type": "Place",
    "geo": {
      "@type": "GeoCoordinates",
      "latitude": "40.75",
      "longitude": "73.98"
    },
    "name": "Empire State Building"
  };
}]).directive('jsonld', ['$filter', '$sce', function($filter, $sce) {
  return {
    restrict: 'E',
    template: function() {
      return '<script type="application/ld+json" ng-bind-html="onGetJson()"></script>';
    },
    scope: {
      json: '=json'
    },
    link: function(scope, element, attrs) {
      scope.onGetJson = function() {
        return $sce.trustAsHtml($filter('json')(scope.json));
      }
    },
    replace: true
  };
}]);

Here is a image of the script output

Please see updated jsfiddle

Answer 2

Tjaart van der Walt's answer did not work for me in the Google Test Tool . It did work with the real crawler. So I found another "old-school" solution which did the trick:

HTML

<script type="application/ld+json" id="json-ld-music-group"></script>

Angular

var schemaOrg = angular.toJson({
    '@context': 'http://schema.org',
    '@type': 'MusicGroup',
    ...
});

angular.element(document).ready(function() {
    var jsonLd = angular.element(document.getElementById('json-ld-music-group'))[0];
    jsonLd.innerHTML = schemaOrg;
});