Measuring the rendering time of an AngularJS directive

Question

Measuring the rendering time of an AngularJS directive

Is there a way to measure the rendering time of a directive (element)? If not, is it possible to identify which directive takes the longest time to render?

PS. I have tried using Batarang, but it only displays watch-expressions that consume the most time. I also searched online and came across a similar question, but unfortunately, it did not provide an answer.

javascript angularjs

Answer 1

Answer №1

My latest project involved developing a directive to monitor the rendering times of Angular views. The directive utilizes a straightforward yet effective speeder library - available at https://github.com/maciejsikora/Speeder. It calculates microseconds from the initial rendering marked by ms-start to the final rendering noted as ms-stop.

<span ms-perf ms-start='symbol'></span>

...performing various actions like ng-ifs, repeats, etc.

<span ms-perf ms-stop='symbol'></span>

For a comprehensive demonstration of how the directive works with ng-repeats, check out this example: https://jsfiddle.net/maciejsikora/4ud2rLgz/

In the example provided, the directive is implemented in a controller, but it can also be utilized in another directive. One drawback of this approach is that the directive needs to be appended to the DOM and subsequently removed once any issues are identified. A more efficient solution would involve creating a provider that can be configured for development and production environments, ensuring that no results or time tracking occurs in production.

Answer 2

My latest project involved developing a directive to monitor the rendering times of Angular views. The directive utilizes a straightforward yet effective speeder library - available at https://github.com/maciejsikora/Speeder. It calculates microseconds from the initial rendering marked by ms-start to the final rendering noted as ms-stop.

<span ms-perf ms-start='symbol'></span>

...performing various actions like ng-ifs, repeats, etc.

<span ms-perf ms-stop='symbol'></span>

For a comprehensive demonstration of how the directive works with ng-repeats, check out this example: https://jsfiddle.net/maciejsikora/4ud2rLgz/

In the example provided, the directive is implemented in a controller, but it can also be utilized in another directive. One drawback of this approach is that the directive needs to be appended to the DOM and subsequently removed once any issues are identified. A more efficient solution would involve creating a provider that can be configured for development and production environments, ensuring that no results or time tracking occurs in production.

Answer 3

Answer №2

Have you considered using Chrome's Timeline inspector for this task?

You can initiate recording of the timeline before rendering, and then stop it after the state change occurs. https://i.sstatic.net/DUj9f.png

The timeline specifically for rendering the directive would be indicated by the Purple section, while the combination of Purple and Painting wedges would provide you with the overall time from the moment the XHR fetch was completed until the template is displayed on the screen. Is there any reason why you think this may not be precise?

Answer 4

Have you considered using Chrome's Timeline inspector for this task?

You can initiate recording of the timeline before rendering, and then stop it after the state change occurs. https://i.sstatic.net/DUj9f.png

The timeline specifically for rendering the directive would be indicated by the Purple section, while the combination of Purple and Painting wedges would provide you with the overall time from the moment the XHR fetch was completed until the template is displayed on the screen. Is there any reason why you think this may not be precise?

Answer 5

Answer №3

When working with directives that do not involve any Promises, an alternative directive can be used to compile its element and then utilize $timeout without the need for dirty checks (setting the 3rd argument to false) within the $compile's callback function:

app.directive('measure', function () {
  return {
    controller: function ($scope, $element, $compile, $timeout, $window) {
      $window.start = new Date().getTime();
      // ensure compilation only happens once
      if (!$window.done) {
        console.log('BEGINNING MEASUREMENT');
        $window.done = true;
        $compile($element)($scope, function(clonedElement, scope) {
          var timer = $timeout(function () {
            console.log('ENDING MEASUREMENT: ' + (new Date().getTime() - $window.start) + 'ms');
            $timeout.cancel(timer);
          }, 0, false);
        });
      }
    }
  };
})

For directives involving Promises, measurement can be done by using $timeout without dirty checks but called within the then block of the last Promise:

app.directive('someOtherDir', function () {
  return {
    template: '<div ng-repeat="item in vm.data"><img ng-src="{{ item.thumbnailUrl }}" title="{{ item.title }}"></div>',
    controller: function ($http, $timeout, $window) {
      console.log('STARTING MEASUREMENT');
      $window.start = new Date().getTime();
      var vm = this;
      $http.get('data.json').then(function (res) {
        vm.data = res.data;
        var timer = $timeout(function () {
          console.log('ENDING MEASUREMENT: ' + (new Date().getTime() - $window.start) + 'ms');
          $timeout.cancel(timer);
        }, 0, false);
      });
    },
    controllerAs: 'vm'
  };
});

Here is a playground plunker showcasing these directives http://plnkr.co/edit/McWOeF7rZ7ZYKnDWafy6?p=preview. You can comment/uncomment the two directives and experiment with increasing the value of i within the someDir directive:

for (var i = 0; i < 20; i++) {
  vm.dates.push({
    timestamp: i * 1000 * 60 * 60 * 24,
    label: new Date(i * 1000 * 60 * 60 * 24).toString()
  });
}

Try values like 200, 2000...

Answer 6

When working with directives that do not involve any Promises, an alternative directive can be used to compile its element and then utilize $timeout without the need for dirty checks (setting the 3rd argument to false) within the $compile's callback function:

app.directive('measure', function () {
  return {
    controller: function ($scope, $element, $compile, $timeout, $window) {
      $window.start = new Date().getTime();
      // ensure compilation only happens once
      if (!$window.done) {
        console.log('BEGINNING MEASUREMENT');
        $window.done = true;
        $compile($element)($scope, function(clonedElement, scope) {
          var timer = $timeout(function () {
            console.log('ENDING MEASUREMENT: ' + (new Date().getTime() - $window.start) + 'ms');
            $timeout.cancel(timer);
          }, 0, false);
        });
      }
    }
  };
})

For directives involving Promises, measurement can be done by using $timeout without dirty checks but called within the then block of the last Promise:

app.directive('someOtherDir', function () {
  return {
    template: '<div ng-repeat="item in vm.data"><img ng-src="{{ item.thumbnailUrl }}" title="{{ item.title }}"></div>',
    controller: function ($http, $timeout, $window) {
      console.log('STARTING MEASUREMENT');
      $window.start = new Date().getTime();
      var vm = this;
      $http.get('data.json').then(function (res) {
        vm.data = res.data;
        var timer = $timeout(function () {
          console.log('ENDING MEASUREMENT: ' + (new Date().getTime() - $window.start) + 'ms');
          $timeout.cancel(timer);
        }, 0, false);
      });
    },
    controllerAs: 'vm'
  };
});

Here is a playground plunker showcasing these directives http://plnkr.co/edit/McWOeF7rZ7ZYKnDWafy6?p=preview. You can comment/uncomment the two directives and experiment with increasing the value of i within the someDir directive:

for (var i = 0; i < 20; i++) {
  vm.dates.push({
    timestamp: i * 1000 * 60 * 60 * 24,
    label: new Date(i * 1000 * 60 * 60 * 24).toString()
  });
}

Try values like 200, 2000...

Answer 7

Answer №4

Truthfully, this inquiry doesn't lend itself to a straightforward answer. The question appears more like a means to an end, prompting us to delve deeper into the underlying issue:

Are you grappling with performance challenges that need identification, or are you simply looking to assess if something operates swiftly enough?

Regrettably, there are various dynamic components involved in determining the rendering time of a directive, including:

child directives
asynchronous template loading
layout thrashing

These are just a few significant factors among many. Essentially, once a directive merely adds elements or adjusts classes, control shifts to the browser for layout rendering. At this point, little can be done.

Though DOM manipulation is indeed rapid, impressively so, consider the constraints – exactly as shown by Velosity.js, demonstrating JS's ability to execute smoother animations than CSS. Nevertheless, limitations exist:

Avoid overwhelming the user with excessive DOM elements; refrain from displaying tens of thousands of table rows at once.
When altering an element's class list or styles, due to CSS cascading behavior, all child elements get re-rendered. Even adding a class to the body triggers a complete page refresh.
Repeatedly writing to and reading from the DOM prompts immediate layout correction, instigating render operations. Multiplying such actions rapidly leads to layout thrashing – where multiple sequential DOM renders occur.

Answer 8

Truthfully, this inquiry doesn't lend itself to a straightforward answer. The question appears more like a means to an end, prompting us to delve deeper into the underlying issue:

Are you grappling with performance challenges that need identification, or are you simply looking to assess if something operates swiftly enough?

Regrettably, there are various dynamic components involved in determining the rendering time of a directive, including:

child directives
asynchronous template loading
layout thrashing

These are just a few significant factors among many. Essentially, once a directive merely adds elements or adjusts classes, control shifts to the browser for layout rendering. At this point, little can be done.

Though DOM manipulation is indeed rapid, impressively so, consider the constraints – exactly as shown by Velosity.js, demonstrating JS's ability to execute smoother animations than CSS. Nevertheless, limitations exist:

Avoid overwhelming the user with excessive DOM elements; refrain from displaying tens of thousands of table rows at once.
When altering an element's class list or styles, due to CSS cascading behavior, all child elements get re-rendered. Even adding a class to the body triggers a complete page refresh.
Repeatedly writing to and reading from the DOM prompts immediate layout correction, instigating render operations. Multiplying such actions rapidly leads to layout thrashing – where multiple sequential DOM renders occur.

Answer 9

Answer №5

Here is an alternative suggestion:

myApp.directive('record', function() {

    return {
        controller: function( $scope, $element, $attrs, $transclude ) {
            console.log( Date.now() + ' (directive controller execution)' );

            //additional tasks can be performed here
        },
        link: function( scope, element, attributes, controller, transcludeFn ) {
             //additional tasks can be performed here

             console.log( Date.now() + ' (post-link function of directive execution)' );
         }
     };  

});

The main difference between the two log statements is comparable to the time taken for rendering the directive.

Answer 10

Here is an alternative suggestion:

myApp.directive('record', function() {

    return {
        controller: function( $scope, $element, $attrs, $transclude ) {
            console.log( Date.now() + ' (directive controller execution)' );

            //additional tasks can be performed here
        },
        link: function( scope, element, attributes, controller, transcludeFn ) {
             //additional tasks can be performed here

             console.log( Date.now() + ' (post-link function of directive execution)' );
         }
     };  

});

The main difference between the two log statements is comparable to the time taken for rendering the directive.

Measuring the rendering time of an AngularJS directive

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Similar questions

Struggling to replicate the Quad from .obj file using only Face3

Adding the data from an ajax object response to an array

"Efficiently rendering a variety of textures using a single draw

What could be preventing $routeChangeSuccess from being called?

Tips for displaying a notification after a successful form submission using jQuery and AJAX

The consequences of jQuery Ajax Memory Leaks

Monitor fetch() API calls and responses in JavaScript

Storing a portion of AJAX response as a PHP variable

Can text be inserted into an SWF file using ASP.NET or Javascript via an online platform?

React: The received value for the prop type must be a function, but it was an object

End-to-end testing in Angular for non-Angular applications

ng-show directive in AngularJS is not functioning properly when utilized with CLI

A comprehensive method in JavaScript to determine if a variable is defined

Is it possible for an HTML number input's arrows to change in increments that are different from its designated step attribute?

Secure AJAX call to PHP service in WordPress, with proper authentication

Renew the Look of Dynamic HTML with Updated Styles

Unable to locate Angular on the page after enabling gzip compression on Azure IIS

The function document.getElementById(...) is failing to retrieve the text data from the table as expected

There is a syntax error in the for-loop within the AngularJS $http.get causing an unexpected identifier

Loading content synchronously