Mastering callback functions within AngularJS animations

Question

Mastering callback functions within AngularJS animations

As I delve into AngularJS animations, I am currently working on a slide-show animation:

app.animation('slide-show', function () {
    return {
        setup: function (element) {
        },
        start: function (element, done) {
            element.slideDown(400, done);
        }
    };
} );

app.animation('slide-hide', function () {
    return {
        setup: function (element) {
        },
        start: function (element, done) {
            element.slideUp(400, done);
        }
    };
} );

My goal now is to enhance this animation by providing an additional "complete" callback as a parameter to the start() methods. This callback would then be used with the jQuery methods in order to further manipulate the animation effects. Can this functionality be achieved using the animation directives in AngularJS?

javascript animation angularjs callback

Answer 1

Answer №1

Although you are already passing a "complete" callback (the second parameter to element.slideUp()), you're not using your own callback function; instead, you are simply calling the Angular-provided done function.

It is necessary to eventually call the done function, but there's nothing stopping you from performing your custom actions before that.

app.animation('slide-hide', function () {
    return {
        setup: function (element) {
        },
        start: function (element, done) {
            element.slideUp(400, function () {
                // handle the end of the slideUp animation
                // ...

                // notify Angular that the animation is completed
                done();
            });
        }
    };
});

If you wish, you can make this more generic:

function AnimationCallback(done, callback, callbackArgs) {
    return function () {
        if (typeof callback === "function") {
            // 'this' refers to the DOM element that just finished animating
            callback.apply(this, callbackArgs);
        }
        done();
    }
}

and

app.animation('slide-hide', function () {
    return {
        setup: function (element) {
        },
        start: function (element, done) {
            element.slideUp(400, new AnimationCallback(done, yourCallback));
        }
    };
});

Here, yourCallback can be any function you have defined and callbackArgs is an optional array of arguments to pass to it.

Answer 2

Although you are already passing a "complete" callback (the second parameter to element.slideUp()), you're not using your own callback function; instead, you are simply calling the Angular-provided done function.

It is necessary to eventually call the done function, but there's nothing stopping you from performing your custom actions before that.

app.animation('slide-hide', function () {
    return {
        setup: function (element) {
        },
        start: function (element, done) {
            element.slideUp(400, function () {
                // handle the end of the slideUp animation
                // ...

                // notify Angular that the animation is completed
                done();
            });
        }
    };
});

If you wish, you can make this more generic:

function AnimationCallback(done, callback, callbackArgs) {
    return function () {
        if (typeof callback === "function") {
            // 'this' refers to the DOM element that just finished animating
            callback.apply(this, callbackArgs);
        }
        done();
    }
}

and

app.animation('slide-hide', function () {
    return {
        setup: function (element) {
        },
        start: function (element, done) {
            element.slideUp(400, new AnimationCallback(done, yourCallback));
        }
    };
});

Here, yourCallback can be any function you have defined and callbackArgs is an optional array of arguments to pass to it.

Answer 3

Answer №2

app.animation('slide-show', function() {
    return {
        setup: function (element) {
            var complete = function() {
                /* Your custom implementation goes here */
            };

            return complete;
        },
        start: function (element, done, complete) {
            element.slideDown(400, done);

            /* Call the function and perform some actions */
            complete();
        }
    };
});

If you want more information, make sure to take a look at this article too:

Answer 4

app.animation('slide-show', function() {
    return {
        setup: function (element) {
            var complete = function() {
                /* Your custom implementation goes here */
            };

            return complete;
        },
        start: function (element, done, complete) {
            element.slideDown(400, done);

            /* Call the function and perform some actions */
            complete();
        }
    };
});

If you want more information, make sure to take a look at this article too:

Answer 5

Answer №3

After facing the same question, I found a successful solution that worked for me:

While using the same animation setup, I decided to include an additional ng-animated property on the HTML element that was being animated. Here is the code snippet I added:

app.animation('slide-show', function () {
    return {
        setup: function (element) {
        },
        start: function (element, done) {
            element.slideDown(400, function(){ 
                 var el = angular.element(element[0]);
                 el.scope().$eval(el.attr('ng-animated'));
                 done();
            });
        }
    };
} );

app.animation('slide-hide', function () {
    return {
        setup: function (element) {
        },
        start: function (element, done) {
            element.slideUp(400, function(){ 
                 var el = angular.element(element[0]);
                 el.scope().$eval(el.attr('ng-animated'));
                 done();
            });
        }
    };
} );

I hope this solution proves helpful to others facing a similar issue!

Answer 6

After facing the same question, I found a successful solution that worked for me:

While using the same animation setup, I decided to include an additional ng-animated property on the HTML element that was being animated. Here is the code snippet I added:

app.animation('slide-show', function () {
    return {
        setup: function (element) {
        },
        start: function (element, done) {
            element.slideDown(400, function(){ 
                 var el = angular.element(element[0]);
                 el.scope().$eval(el.attr('ng-animated'));
                 done();
            });
        }
    };
} );

app.animation('slide-hide', function () {
    return {
        setup: function (element) {
        },
        start: function (element, done) {
            element.slideUp(400, function(){ 
                 var el = angular.element(element[0]);
                 el.scope().$eval(el.attr('ng-animated'));
                 done();
            });
        }
    };
} );

I hope this solution proves helpful to others facing a similar issue!

Mastering callback functions within AngularJS animations

Answer №1

Answer №2

Answer №3

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