calling an async api from angularjs

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Gordon Saxby 1461 posts 1883 karma points

Jan 05, 2023 @ 10:36
0

Calling an async API from AngularJS
I (currently) know very little about AngularJS which is making this task all the more interesting!

I am creating a Dashboard to show data stored in a custom database table. There is also the ability to request an update of the content in the table.

I initially wrote the API Controller to use async methods but I seemed to have trouble calling them from AngularJS so I have removed the async feature for now, but would like to add it back in.

Do I need to use AngularJS "promise" in order to call async APIs? If so, could someone explain how I do that please.

I currently have this:
```
$scope.GetReviews = function () {
    $scope.buttonState = "busy";
    $scope.loading = true;

   var url = "/umbraco/backoffice/api/ReviewsFeedApi/GetReviewsData"
    $http.get(url).then(function (res) {
        $scope.loading = false;
        $scope.buttonState = "success";
   });
}

$scope.GetReviews();
```
What do I need to change in order to support calling an async version of "GetReviewsData"?

**Edit: I have reverted my code to use async calls and it seems to be working, (although I do have an issue when calling the update the second time!) so do I need to change anything or is the above code OK?
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Huw Reddick 1929 posts 6717 karma points MVP 2x c-trib

Jan 05, 2023 @ 11:45

I use the umbRequestHelper like below

angular.module("umbraco.resources").factory("TagCloudResource", function ($http, umbRequestHelper) {
    return {
        cloudPreview: function (maxTags, tagGroup) {
            return umbRequestHelper.resourcePromise(
                $http.get('/umbraco/Surface/TagCloudSurface/TagCloud/?max=' + maxTags + '&group=' + tagGroup),
                'Failed getting preview markup'
            );
        }
    };
});

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Gordon Saxby 1461 posts 1883 karma points

Jan 05, 2023 @ 13:50

0

Could you also show me how you call the function please, and how you then make use of the data returned.

When I tried, none of the $scope variables I set seemed to have any values in them - but they did before using the factory method above.

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Huw Reddick 1929 posts 6717 karma points MVP 2x c-trib

Jan 05, 2023 @ 15:04

Hi Gordon,

This is the code for my angular controller

(function() {

    function tagCloudController($scope, $sce, $timeout,TagCloudResource, editorState, ) {
        try {
            $scope.language = editorState.getCurrent().variants.find(function (v) {
                return v.active;
            }).language.culture;            
        } catch (e) {
            $scope.language = null;
        } 


        $scope.id = editorState.getCurrent().id;
        $scope.loading = true;
        $scope.markup = $sce.trustAsHtml('Loading preview');


        function loadPreview(blockData) {
            $scope.markup = $sce.trustAsHtml('Loading preview');
            $scope.loading = true;

            TagCloudResource.cloudPreview(blockData.maxTags, blockData.tagGroup).then(function (data) {
                $scope.markup = $sce.trustAsHtml(data);
                $scope.loading = false;
            });
        }

        var timeoutPromise;
        $scope.$watchGroup(['block.data'], function (newValues, oldValues) {
            $timeout.cancel(timeoutPromise);
            timeoutPromise = $timeout(function () {
                loadPreview(newValues[0]);
            }, 500);
        }, true);
    }

    angular.module('umbraco')
        .controller('TagCloudController', tagCloudController);
})();

The preview is called here

TagCloudResource.cloudPreview(blockData.maxTags, blockData.tagGroup).then(function (data) {
                $scope.markup = $sce.trustAsHtml(data);
                $scope.loading = false;
            });

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Huw Reddick 1929 posts 6717 karma points MVP 2x c-trib

Jan 05, 2023 @ 15:06

It is displayed in the html by binding 'markup'

<div ng-click="block.edit()" class="blockelement__draggable-element" ng-controller="TagCloudController">
    <h4 >{{block.data.title}}</h4>
  <div ng-if="loading === false" ng-bind-html="markup" publication-check settings="block.settingsData"></div>

</div>

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Gordon Saxby 1461 posts 1883 karma points

Jan 05, 2023 @ 17:29

0

Thanks very much for your help, I will check this out tomorrow :-)

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