Category: Learning

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Learning

What is the life cycle of an HTML request

Hello, Welcome

The life cycle of an HTML request can be divided into following stages:

  1. Request initiation: The request is initiated by the browser, usually in response to a user action, such as clicking a link, submitting a form, or refreshing the page.
  2. DNS Lookup: The browser checks the local cache and DNS servers to resolve the domain name to an IP address. If the domain name has not been resolved before, the browser will initiate a DNS lookup to obtain the IP address of the server.
  3. TCP Connection: The browser establishes a TCP connection with the server. This is the underlying communication channel that will be used to send the HTTP request and receive the response.
  4. Request sent: The browser sends an HTTP request to the server. The request includes information about the type of operation being performed (e.g., GET, POST, PUT, DELETE), the URL being requested, and any additional data that may be required (e.g., form data).
  5. Server processing: The server receives the request and processes it. This may involve retrieving data from a database, processing data, or generating a response.
  6. Response sent: The server generates an HTTP response and sends it back to the browser. The response includes information about the status of the request, the type of data being returned, and the actual data itself.
  7. Response received: The browser receives the response and processes it. This may involve updating the contents of the page, displaying an error message, or redirecting to another page.
  8. Resource loading: If the response includes references to additional resources (e.g., images, stylesheets, scripts), the browser will initiate separate requests for each of these resources.
  9. Page rendering: The browser uses the information in the response to render the final page.

This entire process can take place in a matter of milliseconds, allowing the user to interact with the web page in near-real-time.

Source: AI Interaction Channel

Happy learning!

Categories
Learning Tech

How to write basic Test case for React component using Jest or Enzyme

Lets quickly straight dive into it

import React from "react";
import { shallow } from "enzyme";
import TestComponent from "./TestComponent";

describe("TestComponent", () => {
  it("renders correctly", () => {
    const wrapper = shallow(<TestComponent />);
    expect(wrapper).toMatchSnapshot();
  });

  it("contains a button", () => {
    const wrapper = shallow(<TestComponent />);
    expect(wrapper.find("button").length).toEqual(1);
  });

  it("simulates click events", () => {
    const mockCallBack = jest.fn();
    const wrapper = shallow(<TestComponent handleClick={mockCallBack} />);
    wrapper.find("button").simulate("click");
    expect(mockCallBack.mock.calls.length).toEqual(1);
  });
});

In this example, the describe block creates a test suite for the TestComponent and the it blocks define individual test cases.

The shallow function from Enzyme is used to render a shallow version of the component.

The toMatchSnapshot assertion is used to check that the component is rendering correctly.

The find method is used to locate elements within the shallow render, and the simulate method is used to trigger events on those elements.

The jest.fn function is used to create a mock callback that can be passed as a prop to the component and tested.

Happy Learning.

Categories
Learning Tech

10 Key tips on preparing for ReactJS Interview

Hello,

Lets quickly go through the 10 keys, for preparing for React Js Interview

  1. React basics: Familiarize yourself with React concepts such as components, JSX, state, props, lifecycle methods, hooks, etc.
  2. React-Redux: Understand how to use Redux with React for state management.
  3. React Router: Learn how to handle routing in React applications.
  4. React performance optimization: Know how to optimize the performance of React applications, including techniques like lazy loading, memoization, and using shouldComponentUpdate.
  5. React hooks: Knowledge of React hooks and how they can be used in place of class components.
  6. React testing: Understand how to test React components using tools like Jest and Enzyme.
  7. Familiarity with CSS: Good understanding of CSS, including CSS-in-JS solutions like styled-components.
  8. JavaScript concepts: Good understanding of JavaScript concepts like closure, asynchronous programming, and ES6 syntax.
  9. Git: Knowledge of Git and how to use it for version control.
  10. Problem solving skills: Be prepared to solve algorithmic problems and explain your thought process.

Hope you enjoy learning!

Categories
Learning Tech

Very basic of How to create a React Fiber/React Js Project from scratch

Here is the basic process to create a project with React Fiber:

  1. Install Node.js and npm (Node Package Manager) if you don’t have them installed already.
  2. Use npm to create a new React project by running the following command in your terminal or command prompt:
    npx create-react-app my-app
  3. Navigate to the newly created project directory:
    cd my-app
  4. Start the development server by running:
    npm start
  5. The development server should now be running on http://localhost:3000 in your browser.
  6. You can now start building your React Fiber application by modifying the files in the src directory.
  7. When you’re ready to deploy your application, run the following command to create a production build:
    npm run build

This should give you a basic understanding of how to create a React Fiber project. If you’re new to React, it may be helpful to go through some introductory tutorials before diving into your project.

Happy Learning!

Categories
Downloads & Free Learning Uncategorized

Download Free Bharat (India) Map SVG format

Hello,

Download Bharat (India) Map (SVG format) for Laser Cut or to Print for your school or college projects.

india-bharat-map-for-laser-cut-svg-map
India Full Map SVG Download Free
India-Bharat-Full-Map-SVGDownload
Categories
Blog Learning Tech

How to update PHP version on shared host website or under cpanel?

Hello welcome to the post!

Look for “MultiPHP Manager” in Cpanel search bar or on home page of your Cpanel after login.

Reference screenshot

It will show you your current System PHP version and below option to change the setting for PHP version as required.

From dropdown menu like on right select the version of PHP you needed and apply, before that not to forget to select the list of domains, if you have multiple websites or subdomains to apply the latest PHP version.

Hope this solves your issue to the fastest when composer dependencies gives error like below when you trying to test small issue of your website.

{ "message": "syntax error, unexpected token \")\"", "exception": "ParseError", "file": "/home4/ininszp2/abclar/vendor/symfony/css-selector/XPath/Extension/NodeExtension.php", "line": 68, "trace": [ { "file": "/home4/ininszp2/abclar/vendor/composer/ClassLoader.php", "line": 428, "function": "Composer\\Autoload\\includeFile" }, { "file": "/home4/ininszp2/abclar/vendor/symfony/css-selector/XPath/Translator.php", "line": 56, "function": "loadClass", "class": "Composer\\Autoload\\ClassLoader", "type": "->" }, { "file": "/home4/ininszp2/abclar/vendor/symfony/css-selector/CssSelectorConverter.php", "line": 40, "function": "__construct", "class": "Symfony\\Component\\CssSelector\\XPath\\Translator", "type": "->" }, { "file": "/home4/ininszp2/abclar/vendor/tijsverkoyen/css-to-inline-styles/src/CssToInlineStyles.php", "line": 19, "function": "__construct", "class": "Symfony\\Component\\CssSelector\\CssSelectorConverter", "type": "->" }, { "file": "/home4/ininszp2/abclar/vendor/laravel/framework/src/Illuminate/Mail/Markdown.php", "line": 73, "function": "__construct", "class": "TijsVerkoyen\\CssToInlineStyles\\CssToInlineStyles", "type": "->" }, { "file": "/home4/ininszp2/abclar/vendor/laravel/framework/src/Illuminate/Mail/Mailable.php", "line": 309, "function": "render", "class":

Thanks for reading and Happy learning!

Categories
Blog Learning Tech

how to fix Referrer Policy: strict-origin-when-cross-origin?

Hello,

I was facing this issue on the subdomain site, were subdomain accessing the assets from parent site domain.abc from folder structure pattern path of image file.

Was getting 404 error for loading image… (why I am explaining all over this, lets come to point of fixing 🙂 )

To note I was doing this under my Cpanel Shared Hosting Server.

In my root folder (mdw) of assets for example mdw/assets/images/ created .htaccess files and added following lines of code:

SetEnvIf Origin "http(s)?://(.+\.)?mywebsite\.com(:\d{1,5})?$" CORS=$0

Header set Access-Control-Allow-Origin "%{CORS}e" env=CORS
Header merge  Vary "Origin"

and the image started loading fine, CORS issue resolved.

Just in regex above replace with the exact domain name of parent it will fix the CORS issue of the question.

Beside, if you don’t have access to shared host or cpanel, then try to install browser CORS plugin and enable it to load the resources by bypassing this CORS issue, in same case it still won’t work you would need request your team or superior to get it resolved for you 🙂

Thanks for reading!

Happy Learning!

Categories
Javascript Learning Tech

What to do when you get Error: sgmail send error Bad Request (400) The attachment content must be base64 encoded. attachments.0.content for nodejs or in next js application?

Okay well, this error occurred when you try to send the generated buffer data as an attachment using @sendgrid/mail service.

To tackle issue, will simply paste the previous line of code and the fix line of code so data was then send as base64 content as required with the @sendgrid/mail service

  res.send(response); //previous line of response from nextjs api

after adding the fix over same above line using Buffer

  res.send(Buffer.from(response).toString('base64')); // to base64 string as an output resolve the above issue

If anyone wants to look for the entire piece of file code, here you go: 

// import the necessary node libraries
const chromium = require('chrome-aws-lambda');
const puppeteer = require('puppeteer');
import { createEmailTemplate } from "../../api/functions/index";
// var Buffer = require('buffer/').Buffer  // note: the trailing slash is important!

export default async (req, res) => {

    // console.log({ m: req.method.toLowerCase(), body: Object.keys(req.body).length });

    if (req.method.toLowerCase() !== 'post' ||
        (!Object.keys(req.body).length ||
            process.env.YOUR_EXTERNAL_API_SECRET !== req.body.your_api_secret)) {
        res.status(403).send("Access denied");
        return;
    }

    const { generateType, store } = req.body; // && JSON.parse(JSON.streq.body);
    const templatePayload = {
        ...req.body,
        assetsBaseURL: process.env.NEXT_PUBLIC_ASSETS_BASE_URL,
        siteName: process.env.SITE_NAME,
        logoPath: store?.logo,
    };
    // console.log({ templatePayload });
    try {

        // compile the file with handlebars and inject the customerName variable
        const html = createEmailTemplate("my-invoice", templatePayload);

        // simulate a chrome browser with puppeteer and navigate to a new page
        const browser = await puppeteer.launch({
            args: chromium.args,
            // defaultViewport: chromium.defaultViewport,
            // defaultViewport: generateType && generateType === 'pdf' ? chromium.defaultViewport : { width: 640, height: 1200 }, //chromium.defaultViewport,
            executablePath: await chromium.executablePath,
            headless: generateType && generateType === 'pdf' ? true : chromium.headless,
            ignoreHTTPSErrors: true,
        });

        const page = await browser.newPage();
        await page.setViewport({
            width: 640,
            height: page.viewport().height, // + 400,
            deviceScaleFactor: 1,
        });

        // set our compiled html template as the pages content
        // then waitUntil the network is idle to make sure the content has been loaded
        await page.setContent(html, { waitUntil: 'networkidle0' });

        // convert the page to pdf with the .pdf() method
        let response;
        if (generateType && generateType === 'pdf') {
            const pdf = await page.pdf({ format: 'A4' });
            response = pdf;
        } else {
            const screenshot = await page.screenshot({ fullPage: true });
            response = screenshot;
        }
        await browser.close();

        // // send the result to the client
        res.statusCode = 200;
        res.send(Buffer.from(response).toString('base64'));

        // CODE BELOW WRITE RESPONSE AS HTML AND IMAGE IS DISPLAYED, TESTTED 
        // res.writeHead(200, { 'Content-Type': 'text/html' });
        // res.write('<html><body><img src="data:image/jpeg;base64,')
        // res.write(Buffer.from(response).toString('base64'));
        // res.end('"/></body></html>');

    } catch (err) {
        console.log(err);
        res.status(500).json({ message: err.message });
    }
};

I hope this find useful to anyone who facing this question or challenge.

Happy learning! Enjoy!

Categories
Learning

How to remove stuck Filament from Snapmaker A350 3D module or how to fix Filament Runout error message in snapmaker luban or on touch screen?

snapmaker-a350-filament-runout-issue

There is couple of way to fix this questions around ‘or’ ?

First try the way it mention on the snapmaker support page here:

https://support.snapmaker.com/hc/en-us/articles/360060908513-What-should-I-do-if-the-Touchscreens-keeps-showing-Filament-Runout-

which could solve the issue of the error message of Filament runout.

Incase that’s not your case, then you need to pull out the jammed filament in the filament passer to the nozzle.

Here is the quick answer in the video how to get that jammed filament out more easily and what not required to do (so). Please follow the video how exactly it got fixed for the me for the stuck filament not coming out.

Fix filament stuck issue in Snapmaker 3D Module #snapmaker @3dmodule #filament

After removing the stuck filament, I was still getting filament runout error, I was sure I have missed the steps of tightening the filament runout sensor in the module, so I have used following command line code to skip the check of Filament Runout Error and proceed with the new 3D Prints:

To Disabled Filament Runout check, type code in Command Line Interface in Luban Software: M412 S0
To enable Filament Runout check, type code in Command Line Interface in Luban Software: M412 S1

Hope this solves your issue and happy 3D printing.

Thanks for visiting and have a beautiful time. 🙂

Categories
Learning

Looking for Frontend Developer Remote/Mumbai

Hello,

If you are looking for frontend consultant or full time Sr Frontend lead/developer and your paying have no limit

You can reach out jb@doableyo.com, he is available currently to be hired as permanent fulltime position or if you would like to be partnered with him.

He have worked on complex SPA projects using ReactJs, Angular, NextJs, HTML5, jQuery, CSS3 for fortune 500 MNC companies in India or at Global level.

Thank you

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