What is the best way to instantly update $scope when working with non-angular code?

Question

What is the best way to instantly update $scope when working with non-angular code?

Working with a non-angular library requires establishing communication between them.

<div id="MoipWidget" data-token="{{personaltoken}}" callback-method-success="successCB" callback-method-error="errorCB"></div>

Upon page load, a token must be fetched from the server every time.

$http.post('https://example.org', obj)
        .success(function(data){
            $scope.personaltoken = data.token;
            //However, calling the non-angular library results in an error stating that the token is undefined.
            //It works as intended if executed within a $timeout...

        })
        .error(function(data){
             alert('error');
        });

Attempting to use $scope.$apply or $digest simultaneously leads to an error.

The non-angularjs library being invoked is quite simple, only involving two lines of code.

var settings = {} 
LibraryCall(settings);

How can I promptly update the model?

javascript angularjs angularjs-scope

Answer 1

Answer №1

Following advice from @Kjell, I attempted to utilize $scope.$evalAsync, but unfortunately, it did not yield the desired results.

Further research on $scope led me to the solution I was looking for.

$scope.$applyAsync(function(){
    var settings = {} 
    LibraryCall(settings);
});

Using $scope.$applyAsync allows for scheduling the invocation of $apply at a later time.

https://docs.angularjs.org/api/ng/type/$rootScope.Scope

Answer 2

Following advice from @Kjell, I attempted to utilize $scope.$evalAsync, but unfortunately, it did not yield the desired results.

Further research on $scope led me to the solution I was looking for.

$scope.$applyAsync(function(){
    var settings = {} 
    LibraryCall(settings);
});

Using $scope.$applyAsync allows for scheduling the invocation of $apply at a later time.

https://docs.angularjs.org/api/ng/type/$rootScope.Scope

Answer 3

Answer №2

For the sake of brevity, I have omitted the error callback, please do not remove it in your own code :)

If the code you are calling is asynchronous, you should not encounter any $scope updating issues (as all Angular promises automatically call $apply)...

One way to handle this is:

$http.post('https://example.org', obj).success(function(data){
    $scope.personaltoken = data.token;

    otherLibrary.doSomething(data.token, function(error, result) {
        $scope.changeSomething = 'toHey';
        $scope.$apply();
    });
});

Another approach that should also work is:

$http.post('https://example.org', obj).success(function(data){
    $scope.personaltoken = data.token;

    otherLibrary.doSomething(data.token, function(error, result) {
        $scope.$apply(function() {
            $scope.changeSomething = 'toHey';
        });
    });
});

This next method may result in a $digest already in progress error because $http internally wraps promise callbacks with $apply:

$http.post('https://example.org', obj).success(function(data){
    $scope.personaltoken = data.token;
    $scope.$apply(function() {
        otherLibrary.doSomething(data.token, function(error, result) {
            $scope.changeSomething = 'toHey';
        });
    });
});

Answer 4

For the sake of brevity, I have omitted the error callback, please do not remove it in your own code :)

If the code you are calling is asynchronous, you should not encounter any $scope updating issues (as all Angular promises automatically call $apply)...

One way to handle this is:

$http.post('https://example.org', obj).success(function(data){
    $scope.personaltoken = data.token;

    otherLibrary.doSomething(data.token, function(error, result) {
        $scope.changeSomething = 'toHey';
        $scope.$apply();
    });
});

Another approach that should also work is:

$http.post('https://example.org', obj).success(function(data){
    $scope.personaltoken = data.token;

    otherLibrary.doSomething(data.token, function(error, result) {
        $scope.$apply(function() {
            $scope.changeSomething = 'toHey';
        });
    });
});

This next method may result in a $digest already in progress error because $http internally wraps promise callbacks with $apply:

$http.post('https://example.org', obj).success(function(data){
    $scope.personaltoken = data.token;
    $scope.$apply(function() {
        otherLibrary.doSomething(data.token, function(error, result) {
            $scope.changeSomething = 'toHey';
        });
    });
});

Answer 5

Answer №3

Consider utilizing either $scope.$evalAsync() or $scope.$applyAsync(). These methods are specifically designed for handling tasks like this, allowing the code to be executed at a later time. While similar to $timeout, they may offer faster performance.

$scope.$evalAsync(function(){
    var config = {} 
    LibraryCall(config);
})

Note: To elaborate on the contrast between $timeout and $evalAsync, check out Ben Nadel's insights in this article:

In essence, $scope.$evalAsync() provides a balance of immediate evaluation and deferred execution: It will attempt to evaluate your expression in the current event loop; if not possible, it will defer the evaluation until the next loop - akin to what $timeout() does.

Answer 6

Consider utilizing either $scope.$evalAsync() or $scope.$applyAsync(). These methods are specifically designed for handling tasks like this, allowing the code to be executed at a later time. While similar to $timeout, they may offer faster performance.

$scope.$evalAsync(function(){
    var config = {} 
    LibraryCall(config);
})

Note: To elaborate on the contrast between $timeout and $evalAsync, check out Ben Nadel's insights in this article:

In essence, $scope.$evalAsync() provides a balance of immediate evaluation and deferred execution: It will attempt to evaluate your expression in the current event loop; if not possible, it will defer the evaluation until the next loop - akin to what $timeout() does.

What is the best way to instantly update $scope when working with non-angular code?

Answer №1

Answer №2

Answer №3

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