Javascript async functionality execute code step-by-step

[KanivetsAV]

Hello everybody!

Is there a way to sequentially execute javascript code in vuforia?

I have a function in which I need to perform a series of actions in a clear order:
1) Call the service and get the data
2) Analyze data from the service
3) Depending on the data analysis, show or hide some elements of the vuforia interface

If i write the code like this:

// Call service
$scope.ServiceCall = function () {
     twx.app.fn.triggerDataService("VuforiaThing", "Service");
};

// Anylaze data
$scope.DataAnalyze = function () {
     if ($scope.app.mdl['VuforiaThing'].svc['Service'].data.current['OperationStatus'] == "status"){
         $scope.app.params.testparam = true;
     } else {
         $scope.app.params.testparam = false;
     }
};

//Manipulate UI
$scope.ManipulateUI = function () {
     if ($scope.app.params.testparam == "true"){
         $scope.view.wdg['WidgetID']['visible'] = true;
     } else {
         $scope.view.wdg['WidgetID']['visible'] = false;
     }
};

// Execute code after  view entry
$scope.$on('$ionicView.afterEnter', function() {
     $scope.ServiceCall();
     $scope.DataAnalyze();
     $scope.ManipulateUI();
});

sometimes it turns out that step 2 is performed earlier than 1 and then an incorrect analysis occurs, since there is no data and, accordingly, at step 3, I perform erroneous actions on the interface elements.

If i try to use "async function" vuforia say

! 'async function' is only available in ES8 (use 'esversion: 8').

I find some solutions like this

but it does not working in Vuforia.

How to execute javascript code step by step sequentially?

[pandersson]

Have you tried to listen on serviceInvokeComplete?

Like this example.

$scope.$on('getModelURL.serviceInvokeComplete', function() {

$scope.view.wdg['model-4']['src'] = $scope.app.mdl['remoteDesignShareUtils'].svc['getModelURL'].data.current['result'];

$scope.app.mdl['remoteDesignShareUtils'].svc['copyRep2FileRepowJSON'].data.current['result'];*/

});

[KanivetsAV · Accepted solution]

Hello everybody!

Seems i found solution.

First of all we need on our "screen.js" paste such code comment:

/*jshint esversion: 8 */

After that manipulation vuforia studio don't alert async js functions.

example1:

$scope.$root.$on('SomeTwxService-end', async function(evt, arg) {
    await $scope.Func1();
    await $scope.ManipulateUI();   
    ...
    await $scope.Func1();
    await $scope.Func2();
    await $scope.Func3();
});

example2:

$scope.OpCntrlStateChangedCheck = function () {  
    var step1_value;
    var step2_value;
    var step3_value;
  	var p1 = new Promise((resolve, reject) => {
    	step1_value= angular.element(document.querySelectorAll('twx-widget[widget-id=\"SomeID1\"] twx-widget-content div label input'));
      	resolve();
    });
    var p2 = new Promise((resolve, reject) => {
    	step2_value= angular.element(document.querySelectorAll('twx-widget[widget-id=\"SomeID2\"] twx-widget-content div label input'));
      	resolve();
    });
    var p3 = new Promise((resolve, reject) => {
    	step3_value= angular.element(document.querySelectorAll('twx-widget[widget-id=\"SomeID3\"]'));
      	resolve();
    });

	Promise.all([p1, p2, p3]).then(value => {
	    if (SomeValue == "learn") {
       		for (var x0=0; x0 < $scope.view.wdg['repeater-2']['data'].length; x0++) {
				Step1_value[x0].disabled = true;
            }
        } else {
       		for (var x1=0; x1 < $scope.view.wdg['repeater-2']['data'].length; x1++) {
				Step1_value[x1].disabled = false;
            }        
        } 

        for (var x2=0; x2 < $scope.view.wdg['repeater-2']['data'].length; x2++) {
            if (step1_value[x2].checked == step2_value[x2].checked) {
                step3_value[x2].className = "ControlValueCheckbox checkbox-balanced";
            } else if (step1_value[x2].checked != step2_value[x2].checked) {
                step3_value[x2].className = "ControlValueCheckbox checkbox-assertive";
            }
        }
	});   	
};

I tested functionality in the vuforia studio and on mobile vuforia view application seems to work fine.

It may be useful for other community members.