Angular: promptly exit out of ngClick event handler

Question

Angular: promptly exit out of ngClick event handler

I have a selection menu on my webpage that is essentially an unordered list, with each item in the menu formatted like this:

<li ng-click='doCalc(5)'>Five</li>

The doCalc function that is triggered by clicking on these items may take some time to complete:

function doCalc(num) {
  factorial(num);
}

As a result, the menu remains visible on the screen while the factorial function executes. I would prefer for doCalc to return immediately without waiting for factorial to finish its execution.

I am familiar with achieving this using a delay-less setTimeout or a promise. However, I am curious about the best Angular approach to handle this scenario. Is there a specific Angular method to accomplish this task, rather than resorting to the more generic approaches?

javascript angularjs promise

Answer 1

Answer №1

Two options for creating a promise in Angular are using the $q service or the $timeout service.

function doCalc(num) {
    return $q.when(factorial(num));
};

Alternatively

function doCalc(num) {
    return $timeout(function() {return factorial(num)}, 0);
};

Is one preferred over the other? Will using when block async requests if many are running on the page?

Both the $q service and the $timeout service utilize the $q queue (which utilizes setTimeout). It's important to note that the browser queue and the Angular $q queue work on the same thread, meaning once the factorial function begins, it will run uninterrupted. To prevent potential issues with other asynchronous tasks, consider splitting up the factorial function into multiple calls to $q.when or $timeout (since both use setTimeout internally).

Answer 2

Two options for creating a promise in Angular are using the $q service or the $timeout service.

function doCalc(num) {
    return $q.when(factorial(num));
};

Alternatively

function doCalc(num) {
    return $timeout(function() {return factorial(num)}, 0);
};

Is one preferred over the other? Will using when block async requests if many are running on the page?

Both the $q service and the $timeout service utilize the $q queue (which utilizes setTimeout). It's important to note that the browser queue and the Angular $q queue work on the same thread, meaning once the factorial function begins, it will run uninterrupted. To prevent potential issues with other asynchronous tasks, consider splitting up the factorial function into multiple calls to $q.when or $timeout (since both use setTimeout internally).

Angular: promptly exit out of ngClick event handler

Answer №1

Alternatively

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