Instead of looping over every word in a book: This resulted in a significant performance improvement in the Vocalize application.
Angularjs keyup enter code#
We modified the code and built the tables as html strings utilizing ng-bind-html. The tables didn’t need to be dynamic, and most of them didn’t have any bound interaction, but because they were using ng-repeat they were adding hundreds of unnecessary watchers. In the Vocalize application, we had several very large data tables that were built using ng-repeat. Instead of using one long list, consider breaking it up into multiple smaller chunks and providing a UI for paginating through those chunks.Īnother option is to avoid ng-repeat altogether and build the html using JavaScript. In addition to all of the watchers added ng-repeat gets a second performance hit by doing very heavy DOM manipulation when there are changes. To ensure the list stays in the right order, every row of data is monitored for changes. Ng-repeat is commonly used to display table rows and lists.
The results show that as the number of words in the list increase bind once remains consistent while the regular bindings quickly drop the number of digests able to run in a second. To test the impact on the digest cycle, I created an ng-repeat over a randomly generated list of 10 words to 100,000 words and ran them through Benchmark.js running the digest loop as the comparison test. Here is a fiddle showing how these two examples perform: Instead of looping over a static list of tabs: To use one time binding, simply put :: in front of any variable, and you are in business! It even works with ng-repeat. From the docs: “One-time expressions will stop recalculating once they are stable, which happens after the first digest if the expression result is a non-undefined value.” Thus the expression is evaluated only once the digest cycle does not continue to evaluate it for changes. One time binding is a useful feature introduced in Angular 1.3. Here are some things you can do to reduce watchers: 1. Reducing the number of watchers will not only reduce your application’s memory footprint but also shortens the amount of time taken in each digest cycle. The basic concept is that JavaScript variables can become bound to the html document, and each bound expression is “watched” such that when a digest cycle triggers, it loops over every binding to detect and re-render changes in the data. The Angular world revolves around the digest cycle.
Angularjs keyup enter how to#
We will talk about different ways to reduce the number of watchers, tricks for reducing the digest cycle, and how to eliminate Angular-specific memory leaks. In this post, I am going to touch on some of the lessons that we have learned that have helped us improve the performance of Vocalize. Without taking the time to learn the details however, it is far too easy to make poor decisions that compound, negatively impacting the performance of your applications. AngularJS was well documented, in active development, and had a large community supporting it, so we decided to pick it up.Īngular does not require detailed knowledge of how it works to use it successfully. It allows the developer to write modules in HTML rather than in pure JavaScript, effectively extending the language of HTML. Even though it has a steep learning curve, AngularJS is well suited to building applications very quickly. Our goal was to select a framework that would allow us to prototype quickly while building an application that we wouldn’t need to scrap completely when the product became wildly successful. Qualtrics adopted the use of AngularJS in 2014 when we started building out our Vocalize product.
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