Tips for minimizing Angular $digest-cycle invocations

Issue

In my application, I have noticed that some callbacks are being called excessively during the $digest cycle. This high frequency of calls is causing performance concerns as these callbacks are triggered way more times than expected, sometimes even exceeding 100 calls per UI interaction. I am looking to investigate why this behavior is occurring and find ways to optimize it to prevent any potential performance issues in the future.

Steps Taken

After observing the excessive callback calls, I experimented by simplifying some of the callbacks to just return true instead of evaluating model values. However, this adjustment did not affect the number of $digest calls significantly. Additionally, I tried removing ng-repeat blocks and angular filters across the application, but this also had minimal impact on reducing the number of callback function executions.

It seems that I need a more advanced tool or technique to debug and analyze the $digest loop in my Angular application thoroughly to identify where these excessive calls originate from and how to minimize them effectively.

Queries

What tools and strategies can I utilize to assess the performance of the $digest loop, particularly in terms of the number of loops, within my Angular application?

How can I decrease the frequency of callback calls bound in templates such as the one shown below?

<div ng-if="ctrl.foo()">
    <!--<span>content</span> -->
</div>
javascriptangularjsperformancedigest

Answer №1

Can you explain the digest cycle in AngularJS?

1. The digest cycle is a process where the Angular framework continuously checks for changes in two-way binding variables on its own.

2. It gets triggered whenever a user interacts and changes a two-way binding variable.

3. When two-way binding variables are programmatically changed (in the controller, service, or factory).

The reasons for triggering a digest cycle call include:

What entities are part of the digest cycle?

1. Variables with $watch added to them.

2. ngModel and ng-model themselves internally add a $watch to the variable.

Mainly the $watch function.

How can we avoid calling $digest/$watch?

  1. Consider whether a variable used in the UI needs to be two-way binding. If the answer is NO, opt for one-way bind syntax instead.

  1. Avoid using the watch function from the controller, service, factory. So how can I watch it...

    1. RX js is currently considered the best library to overcome this issue. It's just one option.

    2. Use getter setter

      How?

mymodule.controlle('ctrName', ctrClass);

ctrClass {
    constructor($scope) {
        this.myVar1 = null;
        this.myVar2 = null;
    }

    set myVar1(value) {
        // either code which I want to watch
        // or
        // Some function that should execute after value is set
        this.afterSet();
        return this.myVar1 = value;
    }

    afterSet() {
    }
}

  1. Utilize the controllerAs feature of Angular

  2. Create directives with isolated scopes

About a tool:

Batarange is a good tool for validating an Angular application.

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Tips for validating a session on a React client following a successful authentication via an Express session

After setting up an express REST API backend and React Front End, the front end app redirects users to the signin page using OAuth. The express server then creates a session ID after successful authentication, which can be seen as a browser cookie connect. ...

javascriptreactjsexpressreduxreact-router

What steps do I need to take to ensure my TypeScript module in npm can be easily used in a

I recently developed a module that captures keypressed input on a document to detect events from a physical barcode reader acting as a keyboard. You can find the source code here: https://github.com/tii-bruno/physical-barcode-reader-observer The npm mod ...

javascripttypescriptnpmmodulebrowserify

Ways to verify that window.open is being invoked from a React component

In my React component, I have a set of nested components, each with its own checkbox. The state hook rulesToDownload starts as an empty array and dynamically adds or removes IDs based on checkbox selection. Upon clicking the 'download' button, t ...

javascriptreactjsdomenzymechai-enzyme

Using PHP, Ajax, and JavaScript, display interactive data from the server in a dynamic modal popup listbox within a Tinymce-WordPress

Currently, I am in the process of developing a WordPress plugin using TinyMCE. The main functionality involves a button that triggers a popup modal with some list boxes. These list boxes need to be populated with values fetched from the server. To accompli ...

javascriptphpajaxwordpresstinymce

Send an array collected from a form to the server using ReactJs

I have a task at hand where I need to work on a basic form that sends data to the server. Within this form, there is a specific field where I need to add multiple inputs and store them in an array called "users". To clarify, what I intend to do is have che ...

javascriptreactjsreact-redux

Performing the task of removing a complete script using D3 or JavaScript

Here is the current setup I have in my code: The index.html file contains <div id="div1"></div> and I dynamically load a file into it (when a socket arrives) using this script: <script> var socket = io.connect('http://127.0. ...

javascriptd3.js

Is there a way to convert a URL into a user-friendly json format displayed on a web page

Can someone please help me figure out the proper way to convert this URL into a JSON format that is easily readable using jQuery on an HTML page? ...

javascriptjqueryhtmljsonparsing

NextRouter does not have a property called "refresh"

Here is the provided code snippet: "use client"; import { useRouter } from "next/router"; import { useState } from "react"; export default function CreatePrompt() { const [title, setTitle] = useState(""); const ...

javascriptreactjstypescriptnext.js

What is the best way to extract the text from a class only when it is nested within a particular header tag?

const request = require ('request'); const cheerio = require('cheerio'); const fs = require ('fs'); request("http://kathmandupost.ekantipur.com/news/2018-08-31/bimstec-summit-multilateral-meet-underway.html", (error, response ...

javascriptnode.jsnpmrequestcheerio

Enhance your Highmap R or JavaScript visualization with a unique custom legend feature

Provided below is my code snippet, output$map <- renderHighchart({ region_map = hcmap("countries/nz/nz-all") highchart(type = "map") %>% hc_title(text = "Average") %>% hc_add_series_map(map = region_map, df = data1, joinBy = " ...

javascriptrhighchartshighmapsr-highcharter

Tips for integrating Chart.js into my AngularJS application?

I am a beginner with AngularJS and I'm currently developing an application on Ubuntu. While trying to add Chart.js using npm install chart.js, an error is being displayed as follows. npm WARN <a href="/cdn-cgi/l/email-protection" class="__cf_emai ...

javascriptangularjsnpmchart.js

The matter concerning the intricacies of Rails, JQuery, Prototype, and RJS

I am exploring the integration of Jquery and ajax in rails 3.0.7, but I'm unclear on the current landscape regarding their usage together. There seems to be an abundance of hacks, plugins, and scripts available for utilizing JQuery. So: Is there an ...

javascriptjqueryruby-on-railsajaxprototypejs

Error encountered when attempting to reinitialize DataTable while iterating through multiple tables and searching within tabs

Currently, I am utilizing DataTable to display 3 separate tables with the help of tabs, along with a search function. However, every time I load the page, I encounter a reinitialization error. Here is the snippet of my code: _datatables.forEa ...

javascriptjqueryhtml

Determine if an element is being hovered over using jQuery

How do I determine if the cursor is hovering over an element using jQuery or JS? I attempted to use $('#id').is(':hover'), but it doesn't seem to be functioning as expected. It's worth mentioning that I am calling this line ...

javascriptjquery

What is the process for incorporating a personalized validation function into Joi?

I have a Joi schema and I am trying to incorporate a custom validator to validate data that cannot be handled by the default Joi validators. Currently, my Joi version is 16.1.7 const customValidator = (value, helpers) => { if (value === "somethi ...

javascriptnode.jsvalidationexpressjoi

The CSS class is specifically assigned to a single element

After every two seconds, my JavaScript function is triggered and based on certain logic, I aim to add a CSS class with an effect to an HTML element on the page. var counter = 0; $interval(function () { counter++; ...

javascriptjqueryhtmlcssangularjs

What are the best methods for creating JavaScript charts that efficiently handle massive amounts of data?

After conducting a thorough search, I couldn't find any article similar to what I'm working on for my ASP.Net MVC4 project. The main challenge we're facing is drawing charts with AJAX and JavaScript for extremely large amounts of data. For ...

javascriptajaxasp.net-mvc-4charts

Do not include any null or empty objects when assigning to an array in Mongoose

When using mongoose's find() or findOne() methods, the returned value will be [] and null, respectively, if the where conditions are not met. This can cause issues when assigning these values to an array. Currently, I am filtering out the null values ...

javascriptnode.jsmongoose

Dynamic Bootstrap tooltip

I have a simple Javascript code snippet that I'm struggling with: $("#myinput").hover(function(){ if(condition){ $(this).tooltip({placement: "bottom", title: "mytitle"}); } ); Accompanied by its HTML cou ...

javascripthtmlbootstrap-5

Error 404: Unable to locate webpack bundle.js

As I dive into learning about Webpack configuration, I keep encountering errors in my console. It appears that my webpack app.bundle.js file is not being found. The page successfully loads with the content of my HTML file displaying, but the app.bundle.js ...

javascriptreactjsnpmwebpack