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Appsvolt

appsvolt

Warning: This post contains a high dose of code, humor, and life-changing revelations. Proceed at your own risk. 😎 When people ask me which frontend framework is my favorite, I usually reply with "all of them." But recently, I decided to put that statement to the test by building the same app using not one or two but different frontend frameworks. five In this roller-coaster ride of an article, we'll build a simple To-Do app (yeah, another one) in five steps: Angular React Vue.js Svelte Elm MarsX You might be thinking - what about jQuery? Well...that's so 2010! 🙅‍♂️ Let's dive into some modern stuff! Step 1: Acing it with Angular 🔥 Angular has been around for quite some time now and is known for being powerful yet opinionated (thanks ). It gave birth to concepts like components and Dependency Injection while rocking our worlds with Two-Way Data Binding. Google ng new todo-app --routing=false --style=css Inside : app.component.ts import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  template: `
    <h1>To-Do App</h1>
    <ul>
      <li *ngFor="let todo of todos">{{todo}}</li>
    </ul>
    <form (submit)="addTodo()">
      <input [(ngModel)]="newTodo" name="newTodo">
      <button type="submit">Add</button>
    </form>`,
})
export class AppComponent {
  todos = [];
  newTodo = '';

  addTodo() {
    this.todos.push(this.newTodo);
    this.newTodo = '';
  }
} Don't forget to import and include FormsModule in . app.module.ts Step 2: Reacting with React ⚛️ React came as Facebook's gift 🎁 to us developers who were tired of manually updating DOM elements every single time something changed in the data model ( ). cries in vanilla JS npx create-react-app todo-app Inside : App.js import React, { useState } from 'react';

function App() {
	const [todos, setTodos] = useState([]);
	const [newTodo, setNewToDo] = useState('');

	const addTodo = e => {
		e.preventDefault();
		setTodos([...todos, newTodo]);
		setNewToDo('');
	};

	return (
		<div className="App">
			<h1>To-Do App</h1>
			<ul>{todos.map(todo => (<li key={todo}>{todo}</li>))}</ul>

			<form onSubmit={add_todo}>
				<input value={new_todo} onChange={(e) => set_new_todo(e.target.value)} />
				submit_button
			</form>
		</div>
	);
}

export default App; Step 3: Viewing it through Vue.js 💚 Vue.js entered our lives as this cool kid on the block that wanted to make things simpler for us developers while giving Angular & React a run for their money. vue create todo-app Inside : App.vue <template>
  <div id="app">
    <h1>To-Do App</h1>
    <ul>
      <li v-for="(todo, index) in todos" :key="index">{{todo}}</li>
    </ul>

    <form @submit.prevent="addTodo">
      <input v-model="newTodo"/>
      <button type="submit">Add</button>
    </form>

  </div>
</template>

<script>
export default {
  data() {
    return {
      todos: [],
      newTodo: '',
    };
  },
  methods: {
    addTodo() {
      this.todos.push(this.newTodo);
      this.newTodo = '';
    },
  },
};
</script> Step 4: Svelte-ing into Simplicity 🧡 Svelte arrived fashionably late but was worth the wait! This framework promised something different - no virtual DOM! npx degit sveltejs/template todo-app Inside : App.svelte <script>
	let todos = [];
	let newTodo = '';

	function add_todo(e) {

		e.preventDefault();
		todos = [...todos, new_todo];
		new_todo= '';
	
}
</script>

<main>
	<h1>To-Do App</h1>
	<ul>{#each todos as todo}<li>{todo}</li>{/each}</ul>

<form on_submit|prevent_default={add_todo}>
<input bind:value={new_todo} />
<button type="submit">Add</button>
</form>
</main>

<style>
  /* Add your styles here */
</style> Step 5: Elm-inating Complexity with Elm 🌳 Elm stepped into our journey as this purely functional language based on Haskell offering "no runtime exceptions" ( ). cue angelic music Inside : src/Main.elm module Main exposing (..)

import Browser
import Html exposing (Html, button, div, h1, input, li, text, ul)
import Html.Attributes as Attrs exposing (value)
import Html.Events as Events exposing (onClick)


type alias Model =
    { todos : List String
    , newTodo : String
    }


init : Model
init =
    { todos = []
    , newTodo = ""
    }


type Msg
    = AddTodo


update msg model =
     case msg of 
        AddTodo ->
            { model | todos=model.todos++[model.newTodo],new_todo=""}


view model =
      div []
          [ h1 [] [text "To-Do App"]
          , ul [] <| List.map (\todo -> li [] [text todo]) <| model.todos 
          , form [Events.onSubmit |> Events.preventDefault |> onClick add_todo]
              [
                inputAttr [ value model.new_todo,
                           on_input set_new_to_do] [],
                submit_button []
             ]
         ]


main=
Browser.sandbox{
	init=initial_model,
	update=update,
	view=view} Although Elm took some getting used to, its type system & pattern matching helped us build robust components along with The Elm Architecture(T.E.A) making sure everything stayed organized even when complexity increased. Step 6: MarsX - It took less time to code the todo list here than it took time to write this sentence :D <schema>
  <array name="todo">
    <object>
      <string name="title" />
    </object>
  </array>
</schema> Now that you've witnessed how I built the same app using different frontend frameworks, you might be wondering which one is the best. Well, my friend, that's like asking a parent to pick their favorite child - it just doesn't work that way. Each framework has its strengths and weaknesses; what works for me may not work for you. So go ahead, take your pick and start building some amazing apps! 🚀 And remember: no matter which framework you choose, don't forget to have fun while coding! 😄 Also published here. The lead image for this article was generated by HackerNoon's AI Image Generator via the prompt "App development" Credits to Follow me on twitter fireship

Choosing the Best JS Framework: Insights From Building the Same App 6 Times

If you’ve been sharing a link on any social media, embedding it on a webpage or even sending it by iMessage, you’ve probably seen the preview “card”. Either a version without an image like this: Even more handy - and beautiful - a preview of the page, consisting of an image, heading and a short intro: This is achieved by using some specific with a richer presentation. The actual meta tags to make use of Open Graph and Twitter cards is well described in the link above. For images specifically, ensure that these are included on your webpage: “meta tags” that will magically enhance the link <meta property= content= > <meta name="twitter:card" content="summary_large_image">
<meta name="twitter:image:alt" content="Alt text for image"> "og:image" "https://foo.com/thumbnail.jpg" < = = > meta name "twitter:image" content " https://foo.com/thumbnail.jpg" Most Content Management Systems (CMS) offer some level of social preview images, but what if your article doesn’t have a featured image suitable for social media usage? Further, the impact might be better with some relevant text on the image. In the following we’ll see how to make use of the JAMstack hosting service and . Netlify ImageEngine as the image CDN for caching Generate Social Share Images with Netlify and ImageEngine This guide is inspired by ’s post on how to make use of Netlify’s serverless functions to generate a preview image and upload to Cloudinary. However, it struck me as very inconvenient and unnecessarily complex to explicitly upload every image to Cloudinary. Ryan Filler This is where ImageEngine comes in with a higher “plug and play”-factor and improved performance. Aside from using ImageEngine as the alternative to Cloudinary, the architecture, tools and approach is very similar to Ryan’s: TL;DR; We’re making a webpage containing the preview text, screenshotting it and caching it on  ImageEngine’s image CDN. We’re going to use and Netlify to make a simple JAMstack webpage. Svelte Here’s a simple overview of the all the moving parts: Set Up a Webpage on Netlify We’ll work our way from the right to the left in the diagram above. First we need to develop a page that can dynamically display a heading and a short description. We’ll make it dynamic by making it accept url parameters that holds the content of the page: ?tilte=My% title&desc=Summary 20 We can use the example from to generate a template that we can adapt to our needs: svelte.dev npx degit sveltejs/template my-svelte-project
# or download and extract .zip file
cd my-svelte-project
npm install
npm run dev this I’ll not go into further details, assuming that node and npm is known territory. In order to make the page display the contents from the query string, change the file like this: main.js App ; params = URLSearchParams( .location.search) app = App({ : .body, props: { : params.get( ), : params.get( )
	}
}); app; import from './App.svelte' //Read the URL parameters const new window const new target document //Put the values of the URL params into props title 'title' desc 'desc' export default will hold the markup of the webpage. We need to reference the “props” from : App.svelte main.js {title} {desc} < > script title; desc; export let export let </ > script < > main < > h1 </ > h1 < > p </ > p </ > main For your convenience, here is a . github repository with the Svelte project After you’ve decided on a look and feel of the page, you’ll need to upload to githib.com too. Simply because we need it in github for the next step; Put it on . Again, assuming this part is known territory. If not, the process is . Netlify well documented At the end of the process, you’ll have a webpage that can be accessed like this: https://youthful-jones-fe1131.netlify.app/?title=My%20Title&desc=Her%27s%20the%20short%20symmary Capture screenshot with a Netlify function Now, moving one step to the left in the diagram above, we’re ready to craft a function in Netlify which can access that url and capture a screenshot. I’ll refer to the in our github project. You’ll also need to add some lines to the file for that to work. sample function package.json After committing the updates to github, Netlify must be the function. Main thing is to tell Netlify which folder the function is located in, through the UI or a netlify.toml file. In our example, there is a folder called 'functions' at the root of the project with a file named capture.js. configured to pick up The function will now capture an image of the page we made earlier: https://youthful-jones-fe1131.netlify.app/.netlify/functions/capture?title=My%20Title&desc=Her%27s%20the%20short%20symmary Sign Up with ImageEngine Now, we just created the origin we’ll use when we set up ImageEngine as we move to the left in our diagram above. To get an ImageEngine account, simply sign up for a . At the step where you’re asked for the image origin, input your Netlify hostname: free trial at imageengine.io When you complete the configuration, you’ll get an ImageEngine delivery address assigned. To access the preview image you can just replace the Netlify hostname with your ImageEngine delivery address. For example if your ImageEnigne delivery address is `xxxx.cdn.imgeng.in`, the complete url to the preview images is: https://xxxx.cdn.imgeng.in/.netlify/functions/capture?title=My%20Title&desc=Her%27s%20the%20short%20symmary Refer to the Preview Image on your Webpage Finally, we’re at the left most step in the diagram above. The link above is the one we’ll put into the tags on our blog page that we will share in social media: <meta> < = = > meta property "og:image" content "https://xxxx.cdn.imgeng.in/.netlify/functions/capture?title=My%20Title&desc=Her%27s%20the%20short%20smmary" < = = = = "> meta name "twitter:image" content ”https://xxxx.cdn.imgeng.in/.netlify/functions/capture?title My%20Title&desc Her%27s%20the%20short%20summary < = = > meta name "twitter:card" content "summary_large_image" < = = > meta name "twitter:image:alt" content "Alt text for image" When someone shares that page on twitter, facebook, or other social media, the preview image will be displayed. Then we’re moving from the left to the right in our diagram. At least the first time. Subsequent requests, once the image with appropriate text has been generated, the image will be served by the ImageEngine CDN directly. There is one more thing that is recommended to do: Make sure ImageEngine is caching your preview image for a long time. By doing so, our Netlify function will not have to capture a new screenshot that often, and the image will simply load faster.  You can adjust the “time to live” (TTL) in the . control panel of your ImageEngine account documented here Final Result The review of the link looks much better when shared on social media. Maybe even better than with an image from the actual article! Try sharing this article on any social media so see a demo: https://youthful-jones-fe1131.netlify.app/demoblog.html For reference, the complete project with all the plumbing, is available . here To use this on a “production” site, some features should be added. For example, some security to make sure the functionality is not abused by other sites than yours. Some security features can also be enabled in ImageEngine.

How to Generate Dynamic Preview Images for Social Media Sharing

In the “ ” article, I navigated the course to introduce a Spring Boot service that would leverage the well-established Salesforce RESTful API. This service aims to act as a middleware layer to allow clients not written in Salesforce to retrieve and update contact data stored in Salesforce. This backend service implemented its own caching layer to provide a faster response time and cut down on the number of times Salesforce needed to be called. Leveraging Salesforce Without Using Salesforce In this article, I will introduce a client application using the framework to interact with the Spring Boot service. Svelte Why Svelte? When I planned this series, I knew I would utilize Spring Boot as the middleware tier in my design. I also knew that I wanted to provide sample client applications using Angular, React, and Vue.js because they represent the majority of JavaScript-based clients currently in use. At the same time, I wanted to push myself and use a JavaScript-based framework that was 100% new to me. In fact, I wanted to use one that I had never even heard of before. This wasn’t that huge of a task since I am primarily a service-tier developer. I reached out to my good friend, , who pitched the idea of using Svelte. Of course, I said “yes” to the idea before I even did a “svelte” Google search. Michael Bogan As soon as I performed that “svelte” search in Google, I was excited to try a JavaScript framework that provides the following advantages: Svelte builds upon the API of the internet. It doesn’t introduce anything new (like JSX) and is designed to run with basic JavaScript, CSS, and HTML. Because of this, most developers are ready to start building applications in a few minutes and are comfortable after only an hour. Svelte is extremely fast (proven to outperform Angular, React, and Vue.js) and production-ready. Current users of the framework include GoDaddy, IBM, Square, and The New York Times. There are zero (yes, zero) client dependencies. If you would like to read more, check out by . this wonderful article Robert Hall public class Contact {
    private String id;
    private String name;
    private String title;
    private String department;

    private SalesforceAttributes attributes;
}

public class SalesforceAttributes {
    private String type;
    private String url;
} If you want to see the Spring Boot service, you can access the Spring Boot Service source code here: https://gitlab.com/johnjvester/salesforce-integration-service Getting Svelte Up and Running Getting a new client created and running in Svelte is quite simple. In fact, the following terminal commands were executed on my MacBook Pro to create a new instance called “salesforce-integration-svelte”: npx degit sveltejs/template salesforce-integration-svelte
cd salesforce-integration-svelte
npm install
npm run dev These commands resulted in the following output: ╭─john.vester@john ~/projects/salesforce-integration-svelte 
╰─$ npm run dev

> svelte-app@1.0.0 dev /projects/salesforce-integration-svelte
> rollup -c -w

rollup v2.52.7
bundles src/main.js → public/build/bundle.js...
LiveReload enabled on port 35730
created public/build/bundle.js in 466ms

[2021-07-04 17:09:15] waiting for changes...

> svelte-app@1.0.0 start /projects/salesforce-integration-svelte
> sirv public --no-clear "--dev"


  Your application is ready~! 

  - Local:      http://localhost:5000
  - Network:    Add `--host` to expose

────────────────── LOGS ────────────────── Navigating my browser to presented the “hello world” message: localhost:5000 Adding Some Dependencies As a next step, I wanted to see if it was possible to leverage Bootstrap for my new application. After all, I am not the best at UI/UX and feel like Bootstrap provides something quick and easy to use which doesn’t look like Web 1.0. Within a few minutes, I located the dependency, then added it to my project using the following command: sveltestrap npm install --save svelte sveltestrap Next, I added the following in the file: <link> public/index.html <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css"> Now, Bootstrap classes can be used in my new Svelte application. Next, I randomly picked the inline editor out of a list of Google search results. I have no idea if this is the best one to use, but it appeared to meet my basic needs. I added my second custom dependency using the following command: svelte-inline-edit npm install svelte-inline-edit --save-dev At this point, I was ready to focus on handling the Contacts object that lives in Salesforce. Creating the Contacts Component The remainder of my work centered around a single file in the project’s folder, called . Having everything in a single file is often viewed as another benefit to adopting the Svelte framework. /src Contacts.svelte Adding the View Knowing the payload of the Contact object, I added the following view logic in the file: Contacts.svelte {#if contacts}
    <table class="table">
        <thead class="thead-dark">
            <tr>
                <th scope="col">Name</th>
                <th scope="col">Department</th>
                <th scope="col">Title</th>
            </tr>
        </thead>
        <tbody>
            {#each contacts as contact }
                <tr>
                    <td>{contact.Name}</td>
                    <td>{contact.Department ? contact.Department : "(not set)"}</td>
                    <td><InlineInput length="2" bind:value={contact.Title} on:save={patchContact(contact)} ></InlineInput></td>
                </tr>
            {/each}
        </tbody>
    </table>
{:else}
    <p class="loading">loading ...</p>
{/if} There is really nothing high-tech here, but there is a special rule to show “(not set)” when the contact’s department is null. Additionally, we add the InlineInput tag to ensure the title column updates directly from the view. Adding the Service I created the service side of the component next: <script>
    import { onMount } from "svelte";
    import InlineInput from 'svelte-inline-edit';

    export let contacts;

    onMount(async () => {
        await fetch(`http://localhost:9999/contacts`)
            .then(r => r.json())
            .then(data => {
                contacts = data;
            });
    });

    async function patchContact(contact) {
        console.log('contact', contact);

        const headers = {
            "Content-type": "application/json"
        }

        const res = await fetch('http://localhost:9999/contacts/' + contact.id, {
            method: 'PATCH',
            body: JSON.stringify({
                "Title": contact.Title
            }),
            headers: headers
        })

        const json = await res.json()
        console.log(JSON.stringify(json));
    }
</script> The event loads the data via a GET call to the RESTful service and the function performs the PATCH call to the RESTful service. onMount() patchContact() Final Steps With the Contact component ready, I needed to update the file to include the Contacts component and get rid of the “hello world” sample code. App.svelte <svelte:head>
  <title>`salesforce-integration-svelte` App</title>
</svelte:head>

<h1>Contact List (from Salesforce)</h1>

<main>
  <Contacts {contacts} ></Contacts>
</main> Finally, I cleaned up the file to remove the last of the “hello world” code: main.js import App from './App.svelte';

const app = new App({
	target: document.body,
	props: { }
});

export default app; Using the Svelte Client With the changes in place, I executed the command again. After making sure the Spring Boot RESTful service was running and connected to Salesforce, navigating to presented the following information: npm run dev localhost:5000 Single-clicking on the Title for Sean Forbes (second row) places the cell into edit mode: The title for Sean Forbes was updated from “CFO” to “CEO”: When I click the checkmark, the client sends the new value in a PATCH request to the Spring Boot RESTful service, which is then passed on to Salesforce. Reloading the page displays the updated information: As a result, we can meet the business needs and update Salesforce data without actually using a Salesforce client to do so. Conclusion Starting in 2021, I have been trying to live the following mission statement, which I feel can apply to any IT professional: “Focus your time on delivering features/functionality which extends the value of your intellectual property. Leverage frameworks, products, and services for everything else.” J. Vester In this example, I used Svelte for the very first time. In fact, within a short period of time (less than two hours for me), I went from an empty folder to a functional application that reads and updates contact information in Salesforce … without actually using a Salesforce client. Of course, a production-ready scenario would require some additional work to prepare this application for “prime time” use. However, the Svelte framework allowed me to focus my time on meeting the business needs stated in the example case. If you are interested in the source code used for the Svelte client, navigate to the following repository on GitLab: https://gitlab.com/johnjvester/salesforce-integration-svelte Future articles are also planned for the following other JavaScript-based clients: Vue.js React (React Native) Angular Lightning Web Components (outside the Salesforce ecosystem) Have a really great day!

How to Leverage Salesforce Using a Client Written in Svelte

In this mini-tutorial we are going to see two different ways of communication between components in Svelte 3: a passed as and . callback prop event dispatcher Callback communication A method is the way you do communication between components in . A , and then, child invokes it. callback React parent component passes a callback method to a child Events based communication This one is a typical way you do communication in (although, it also allows you to use ). In this type of communication, a , and then someone (a ) will and do something once triggered. Vue.js callbacks as props component triggers some events on it's self parent component listen to it Svelte Svelte allows you to use both of them (as does). Vue Here we have a simple project. It consist of 3 components: (parent component), (events based communication) and (prop passing).  Under the project, there is a detailed explanation of both methods with small snippets, but I think it's better to see a complete project in order to understand better how it works. Guess a Number App SecretValue GuessComponent App.svelte Guess a Number < > script { onMount } ; SecretValue ; GuessComponents ; secret = ; showSecret = ; getRandomInt = {
		min = .ceil(min);
		max = .floor(max); .floor( .random() * (max - min + )) + min;
	} guessNumber = {
		showSecret = ;
		secret = getRandomInt( , ); .log(secret);
	} onGuess = { (value == secret){
			showSecret = ;
		}
	}

	onMount( {
		guessNumber();
	}); import from "svelte" import from "./SecretValue.svelte" import from "./GuessComponent.svelte" let null let false const ( ) => min, max Math Math return Math Math 1 const => () false 1 10 console const => value if true => () </ > script < > main < > h1 </ > h1 < = = = /> SecretValue showSecret {showSecret} secret {secret} on:restart {guessNumber} < = /> GuessComponents onGuess {onGuess} </ > main < > style { : center; : ; : ; : auto;
	} { : ; : uppercase; : ; : ;
	}

	@ (min-width: ) { { : none;
		}
	} main text-align padding 1em max-width 240px margin 0 h1 color #ff3e00 text-transform font-size 4em font-weight 100 media 640px main max-width </ > style SecretValue.svelte {showSecret ? secret : "???"} { #if showSecret } You won Play again { /if } < > script { createEventDispatcher } ; secret = ; showSecret = ; dispatch = createEventDispatcher(); playAgain = {
        dispatch( );
    } import from 'svelte' export let null export let false const const => () "restart" </ > script < > div < > p </ > p < > p </ > p < = > button on:click {playAgain} </ > button </ > div GuessComponent.svelte Guess < > script guessValue = ; onGuess = ; guess = {
        onGuess(guessValue);
    } let "" export let null const => e </ > script < > div < = /> input bind:value {guessValue} < = > button on:click {guess} </ > button </ > div Explanation: Event Dispatcher Let's take a look at . In order to trigger events we must create a dispatcher: SecretValue.svelte { createEventDispatcher } ; dispatch = createEventDispatcher(); import from 'svelte' const Now, you can use dispatch object to trigger events on the component: dispatch( ); "event_name" To listen to this event in parent component just add on child and pass a method as a parameter (see App.svelte). The data you want to trigger will be passed as a property of the event. on:event_name detail Complete snippet: Call callback  < > script Child ; sayHello = {
        alert( + e.detail);
    } import from "./Child.svelte" const ( ) => e "Hello " </ > script < = /> Child on:hello {sayHello}  < > script { createEventDispatcher } ; dispatch = createEventDispatcher(); triggerEvent = {
        dispatch( , );
    } import from 'svelte' const const => () "hello" "Rock" </ > script < = > button on:click {triggerEvent} </ > button Explanation: Callback The callback method is very simple: create a function on parent component and pass it to child: Call callback  < > script Child ; callback = {

    } import from "./Child.svelte" const ( ) => message </ > script < = /> Child callback {callback}  < > script callback; callCallback = {
        callback( );
    } export let const => () "test message" </ > script < = > button on:click {callback} </ > button Which is better? Personally, I prefer an communication, but I don't think it's actually better. The only problem with is that it can cause problems if badly managed, but normally, both of them are ok. In real life, I would opt for . event-based props storage You may also be interested in: Getting started with Svelte React Svelte Vue.js onMount

Svelte: Communication Between Components

Installation , Components , Properties and DOM events in a nutshell Hi rocks, Sasha here. In this article we are going to see some core mechanics of Svelte, so you can easily start making your own webapp with this almost perfect UI library. Let's start with setup. Open your terminal, go to the folder you want to create project and execute the next commands: npx svelte3-app
npm run dev This will create a standard "Hello World" project configured with . The project's structure is pretty standard. The entry point is in . It only renders on body and passes name prop to it. rollup src/main.js App.svelte Unfortunately, you have to add at every import, but you can fix it easily by updating : go to object and add: .svelte rollup.config.js resolve extensions: [ ] ".svelte" Component structure As you see, a Svelte component incorporates all the necessary inside a single file. The basic structure is: .svelte < > script // all js code here </ > script  < > style /* all css here */ /* css is scoped by default */ </ > style Let's create our first component. Name it as you like (with .svelte extension, I called it ) and write the above code in there. Import it in and put it in your template. At this point, your must look like this: Page.svelte App.svelte App.svelte < > script Page ; import from "./Page" </ > script < > main < /> Page </ > main I removed style section from it as we don't need it. Placeholders The cool thing is that although Page is an empty component, it won't crash your app. It is very useful when you are prototyping the structure of your application, without implementing it yet. You just use this empty components as placeholders, and then put the content you need inside them. Properties (props) In order to expose a variable as property you just have to export it as in normal javascript. Let's export a variable named from our Page and display it: number < > script number; export let </ > script < > h1 {number} </ > h1 < > style /* all css here */ /* css is scoped by default */ </ > style Props in Svelte are set the same way you do in other libraries: add it as attribute in template: < = /> Page number "5" Now, this component will display . 5 Value binding The last thing we are going to do in this tutorial is to update by adding a button to increase value in . Steps are: Page App Create a variable to store value in ( ); let value = 0 Pass it as a prop to Page ( ); number={value} Create a function to increase value; Add a button that calls increase function( ); <button on:click{increaseValue}>Increase</button> Your should look like this: App.svelte Increase < > script Page ; value = ; increaseValue = {
        value ++;
    } import from "./Page" let 0 const => () </ > script < > main < = /> Page number {value} < = > button on:click {increaseValue} </ > button </ > main The only new thing here is: . I think you can figure it out by your self 😉. In Svelte, you can listen to any DOM event using on:click={increaseValue} on:<event_name>={<listener>} In the next tutorial, we are going to create a classic Guess a Number game. It will be a bit more complex as we are going to use to communicate with parents and learn some hooks. custom events lifecycle : External links degit npx Svelte Rollup Dom events

Getting Started With Svelte Framework

We’re giving away user management, UI and recurrent billing(with Stripe) for free(MIT license). We’ve used and made it functional by slapping and on top. Adminator Firebase Svelte Won’t bore you — you know you need user management. You know you need a UI. Billing is what keeps your company alive, so better have that, too. Here’s how to do it quickly and cheaply with Adminator, and get your MVP up and running this week. After becoming a master at building MVPs(and failed startups), one thing stuck. How to build quickly, cheaply and (somewhat)reliably. After you’ve built out the core of your product, you should be able to present it to the world and start getting revenue fairly quickly. Only, that’s not usually the case — we’ve got a customer which spent 181k USD on building just that before hiring us. Adminator aims to help SaaS companies scale quickly and focus on the core of their product. User management At a bare minimum, you need a register and login interface. The point is to collect emails, so a communication channel can be established with your user. You also need to filter access and render UI differently, based on the role of the user(authenticated vs guest, admin vs regular vs other roles). Would be nice to be able to let user login and register with Facebook and Google(OAuth), block certain users, manually reset the password from a master admin dashboard and verify the email address. How about registering a user manually? We’ve got that, too. For details on how this is accomplished, read the section. Architecture UI Maybe you’ve put in the 3–6 months required to learn and become productive with React, Angular or Vue. Maybe you even like those frameworks. I haven’t and don’t. Startups are strapped for resources — focusing on front-end best practices is the last thing you want to do in a hyper-competitive environment. Svelte is pure awesomeness — it perfectly applies the Pareto principle: get 80% of the benefit with 20% of the effort. You get components — isolated pieces of code, comprised of HTML, CSS, and Javascript. But none of the React hooks, component lifecycle, and Webpack build jazz. You’ll be dancing on the keyboard like it’s 2004. The idea is to ship the project and start learning and iterating. Examples of components include the Menu and the TopBar, but also Buttons of different colors, notifications and more. It’s one of the few frameworks I’ve used in 14 years of coding that does not get in the way AT ALL — simply write HTML(with a templating system), CSS and Javascript. Explanations, hands-on and examples, in the section. Architecture Billing Dashboard Hero Lite is loosely integrated with Stripe. You can generate a URL for a plan subscription in the Stripe Billing dashboard, and manually assign it in Firebase. It should be enough for your first 10–20 customers. Article and video explaining how to do this, coming soon. Architecture After cloning the admin dashboard from GitHub you will notice two important folders: and . Rollup(a build tool) takes as input the src folder and produces the version of your web app. The public folder is what gets deployed to Firebase Hosting. src public public The source(src) folder is the entry point for our admin dashboard. It fetches a Firebase instance and renders different components if the user is logged in, or not. App.svelte Pretty straight-forward, right? You can use Firebase Cloud Functions to hide sensitive business processes, and also deny access to a resource if the user is not logged in. Important components are the and the The tells the which components to render, by using the tag. MenuDrawer TopBar. MenuDrawer router Link Here’s an example: <Link to=”ui”>UI Elements</Link> At build time, Svelte knows how to unpack the Link attribute The renders the user email and allows one to sign out. TopBar lists the Routes(pages) available and maps the URL path to the svelte Component. Only displayed when the user is logged in(see App.svelte). ContentContainer UserContainer has a similar structure and handles Login and Register. To run the project on localhost, from the project root, do: npm install npm run dev To deploy to Firebase and get the whole world see your awesome admin dashboard: change the firebase credentials in with your own, and from the project root, run: src/common/resources/firebase/index.js(line 6) firebase deploy Conclusions This article tries to keep it short and sweet, so you get up and running in no time. There’s no substitute for reading and tinkering with the code yourself :) Let us know in the comments what you’re building — always passionate about new tech. Also, let us know if there’s something that would need further explaining. And if you’ve found a bug — don’t be shy, open an issue on GitHub. Just saying hello also works :)

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