Accordion - Documentation | www.HtmlElements.com

Overview

The smart-accordion element represents a component with expandable items - smart-accordion-item. Each item contains header and content part. Click on the header toggles the content part.

Getting Started

Getting Started with Accordion Web Component

Smart UI for Web Components is distributed as smart-webcomponents NPM package. You can also get the full download from our website with all demos from the Download page.

Setup the Accordion

Smart UI for Web Components is distributed as smart-webcomponents NPM package

  1. Download and install the package.

    npm install smart-webcomponents

  2. Once installed, import the Accordion module in your application.

    <script type="module" src="node_modules/smart-webcomponents/source/modules/smart.accordion.js"></script>

  3. Adding CSS reference

    The smart.default.css CSS file should be referenced using following code.

    <link rel="stylesheet" type="text/css" href="node_modules/smart-webcomponents/source/styles/smart.default.css" />

  4. Add the Accordion tag to your Web Page

    <smart-accordion id="accordion">
 	  <smart-accordion-item label="Item 1" content="Content 1" expanded></smart-accordion-item>
	  <smart-accordion-item label="Item 2" content="Content 2"></smart-accordion-item>
	  <smart-accordion-item label="Item 3" content="Content 3"></smart-accordion-item>  
 </smart-accordion>

  5. Create the Accordion Component

    	<script type="module">
		Smart('#accordion', class {
			get properties() {
				return {"expandMode":"multiple"}
			}
		});
	</script>

    Another option is to create the Accordion is by using the traditional Javascript way:
    	const accordion = document.createElement('smart-accordion');

	accordion.disabled = true;
	document.body.appendChild(accordion);

    Smart framework provides a way to dynamically create a web component on demand from a DIV tag which is used as a host. The following imports the web component's module and creates it on demand, when the document is ready. The #accordion is the ID of a DIV tag.

    	import "../../source/modules/smart.accordion.js";

	document.readyState === 'complete' ? init() : window.onload = init;

	function init() { 
		const accordion = new Smart.Accordion('#accordion', {"expandMode":"multiple"});
	}

  6. Open the page in your web server.
Load scripts

The following code adds the custom element to the page.

<!DOCTYPE html>
	<html lang="en">
	<head>
	 <link rel="stylesheet" href="../../source/styles/smart.default.css" type="text/css" />
	 <script type="text/javascript" src="../../source/smart.element.js"></script>
	 <script type="text/javascript" src="../../source/smart.button.js"></script>
	 <script type="text/javascript" src="../../source/smart.accordion.js"></script>
	</head>
	<body>
	 <smart-accordion>
	  <smart-accordion-item label="Item 1" content="Content 1" expanded></smart-accordion-item>
	  <smart-accordion-item label="Item 2" content="Content 2"></smart-accordion-item>
	  <smart-accordion-item label="Item 3" content="Content 3"></smart-accordion-item>  
	 </smart-accordion>
	</body>
	</html>

Demo

Note how smart.element.js is declared before everything else. This is mandatory for all custom elements.

Remove all items

. To remove all items, we can use that: 
	const items = [...document.querySelectorAll('smart-accordion-item')];
    items.forEach(item => item.remove());

Appearance

The element contains items of type smart-accordion-item. Each item has:
  • label - used as header part in the accordion item. The content part could be toggled on label's click.
  • content - the content part of the item. It could be HTML or plain text.
The user can add/remove/update items via insert, remove and update methods:

<!DOCTYPE html>
	<html lang="en">
	<head>
	 <link rel="stylesheet" href="../../source/styles/smart.defaut.css" type="text/css" />
	 <script type="text/javascript" src="../../source/smart.elements.js"></script>
	 <script>
	 window.onload = function () {
		const accordion = document.querySelector('smart-accordion');
		accordion.insert(0, { "label": "New label", "content": "New content" });
		accordion.update(1, { "label": "Updated label 1", "content": "Updated content 1 " });
		accordion.remove(2);
	 }
	 </script>
	</head>
	<body>
	 <smart-accordion>
	  <smart-accordion-item label="Item 1" content="Content 1" expanded></smart-accordion-item>
	  <smart-accordion-item label="Item 2" content="Content 2"></smart-accordion-item>
	  <smart-accordion-item label="Item 3" content="Content 3"></smart-accordion-item>  
	 </smart-accordion>
	</body>
	</html>

Demo

Behavior

User can expand/collapse items according to the current expandMode:
  • 'single' - only one item can be expanded. If the expanded item's height is greater than the value of the height property, a vertical scrollbar is shown.
  • 'singleFitHeight' - only one item can be expanded. If the expanded item's height is greater than the value of the height property, a vertical scrollbar is shown inside the content of the expanded item.
  • 'multiple' - multiple items can be expanded. If the expanded item's height is greater than the value of the height property, a vertical scrollbar is shown.
  • 'toggle' - only one item can be expanded. The expanded item can also be collapsed. If the expanded item's height is greater than the value of the height property, a vertical scrollbar is shown.
  • 'none' - no items can be expanded/collapsed.
On initialization expanded items could be defined as an array in expandedIndexes property. If the expand mode allows single expanded item the array is limited to the first value and this index is expanded.

 <smart-accordion expand-mode="multiple" expanded-indexes="[0,1]">
	  <smart-accordion-item label="Item 1" content="Content 1" expanded></smart-accordion-item>
	  <smart-accordion-item label="Item 2" content="Content 2"></smart-accordion-item>
	  <smart-accordion-item label="Item 3" content="Content 3"></smart-accordion-item>  
	 </smart-accordion>

Demo

smart-accordion has expand and collapse methods.

Here's how to expand and collapse items:

<!DOCTYPE html>
	<html lang="en">
	<head>
	 <link rel="stylesheet" href="../../source/styles/smart.default.css" type="text/css" />
	 <script type="text/javascript" src="../../source/smart.elements.js"></script>
	 <script>
	 window.onload = function () {
		let accordion = document.querySelector('smart-accordion');
		accordion.expandMode = 'multiple';
		accordion.expand(1);
		accordion.expand(2);
		accordion.collapse(0);
	 }
	 </script>
	</head>
	<body>
	 <smart-accordion>
	  <smart-accordion-item label="Item 1" content="Content 1" expanded></smart-accordion-item>
	  <smart-accordion-item label="Item 2" content="Content 2"></smart-accordion-item>
	  <smart-accordion-item label="Item 3" content="Content 3"></smart-accordion-item>  
	 </smart-accordion>
	</body>
	</html>

The animation class added in Smart.Accordion, produces smooth animation in the transition between expanded and collapsed state of the accordion items. The speed of the animation is defined in --smart-accordion-animation-duration CSS variable.

Manipulating the content

The element offers the following methods about item's manipulations:
  • insert - sets the menu to maximized mode.

     <script>
		 window.onload = function () {
			 const accordion = document.querySelector('smart-accordion');
			 accordion.insert(0, { "label": "New label", "content": "New content" });
		 }
	 </script>
  • update - sets the menu to maximized mode.

     <script>
		 window.onload = function () {
			 const accordion = document.querySelector('smart-accordion');
			 accordion.update(0, { "label": "Updated label 0", "content": "Updated content 0 " });
		 }
	 </script>
  • remove - sets the menu to maximized mode.

     <script>
		 window.onload = function () {
			 const accordion = document.querySelector('smart-accordion');
			 accordion.remove(0);
		 }
	 </script>

Create, Append, Remove, Get/Set Property, Invoke Method, Bind to Event


Create a new element:
	const accordion = document.createElement('smart-accordion');

Append it to the DOM: 
	document.body.appendChild(accordion);

Remove it from the DOM: 
	accordion.parentNode.removeChild(accordion);

Set a property: 
	accordion.propertyName = propertyValue;

Get a property value: 
	const propertyValue = accordion.propertyName;

Invoke a method: 
	accordion.methodName(argument1, argument2);

Add Event Listener: 
	const eventHandler = (event) => {
	   // your code here.
	};

	accordion.addEventListener(eventName, eventHandler);

Remove Event Listener: 
	accordion.removeEventListener(eventName, eventHandler, true);

Using with Typescript

Smart Web Components package includes TypeScript definitions which enables strongly-typed access to the Smart UI Components and their configuration.

Inside the download package, the typescript directory contains .d.ts file for each web component and a smart.elements.d.ts typescript definitions file for all web components. Copy the typescript definitions file to your project and in your TypeScript file add a reference to smart.elements.d.ts

Read more about using Smart UI with Typescript.

Getting Started with Angular Accordion Component

Setup Angular Environment

Angular provides the easiest way to set angular CLI projects using Angular CLI tool.

Install the CLI application globally to your machine. 

npm install -g @angular/cli

Create a new Application

ng new smart-angular-accordion

Navigate to the created project folder 

cd smart-angular-accordion

Setup the Accordion

Smart UI for Angular is distributed as smart-webcomponents-angular NPM package

  1. Download and install the package.
    npm install smart-webcomponents-angular
  2. Adding CSS reference

    The following CSS file is available in ../node_modules/smart-webcomponents-angular/ package folder. This can be referenced in [src/styles.css] using following code. 

    @import 'smart-webcomponents-angular/source/styles/smart.default.css';

    Another way to achieve the same is to edit the angular.json file and in the styles add the style. 

    "styles": [
		"node_modules/smart-webcomponents-angular/source/styles/smart.default.css"
	]
    If you want to use Bootstrap, Fluent or other themes available in the package, you need to add them after 'smart.default.css'.
  3. Example with Angular Standalone Components


    app.component.html

     <smart-accordion>
    <smart-accordion-item [label]="'First Item'">First Item Content.</smart-accordion-item>
    <smart-accordion-item [label]="'Second Item'">Second Item Content.</smart-accordion-item>
    <smart-accordion-item [label]="'Third Item'">Third Item Content.</smart-accordion-item>
    <smart-accordion-item [label]="'Fourth Item'">Fourth Item Content.</smart-accordion-item>
</smart-accordion>

    app.component.ts

     import { Component, ViewChild, OnInit, AfterViewInit } from '@angular/core';


import { CommonModule } from '@angular/common';
import { RouterOutlet } from '@angular/router';
import { AccordionModule } from 'smart-webcomponents-angular/accordion';

@Component({
    selector: 'app-root',
	standalone: true,
	imports: [CommonModule, AccordionModule, RouterOutlet],
    templateUrl: './app.component.html',
	styleUrls: ['./app.component.css']
})

export class AppComponent implements AfterViewInit, OnInit {	
	
 
	ngAfterViewInit(): void {
		// afterViewInit code.
    }
	
	ngOnInit(): void {
		// onInit code.
		this.init();
	}
	
	init(): void {
		// init code.
	    

	}	
}

  4. Example with Angular NGModule


    app.component.html

     <smart-accordion>
    <smart-accordion-item [label]="'First Item'">First Item Content.</smart-accordion-item>
    <smart-accordion-item [label]="'Second Item'">Second Item Content.</smart-accordion-item>
    <smart-accordion-item [label]="'Third Item'">Third Item Content.</smart-accordion-item>
    <smart-accordion-item [label]="'Fourth Item'">Fourth Item Content.</smart-accordion-item>
</smart-accordion>

    app.component.ts

     import { Component, ViewChild, OnInit, AfterViewInit } from '@angular/core';


@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
	styleUrls: ['./app.component.css']
})

export class AppComponent implements AfterViewInit, OnInit {	
	
 
	ngAfterViewInit(): void {
		// afterViewInit code.
    }
	
	ngOnInit(): void {
		// onInit code.
		this.init();
	}
	
	init(): void {
		// init code.
	    

	}	
}

    app.module.ts

     import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { AccordionModule } from 'smart-webcomponents-angular/accordion';

import { AppComponent } from './app.component';

@NgModule({
    declarations: [ AppComponent ],
    imports: [ BrowserModule, AccordionModule ],
    bootstrap: [ AppComponent ]
})

export class AppModule { }


Running the Angular application

After completing the steps required to render a Accordion, run the following command to display the output in your web browser

ng serve
and open localhost:4200 in your favorite web browser.

Read more about using Smart UI for Angular: https://www.htmlelements.com/docs/angular-cli/.

Getting Started with React Accordion Component

Setup React Environment

The easiest way to start with React is to use NextJS Next.js is a full-stack React framework. It’s versatile and lets you create React apps of any size—from a mostly static blog to a complex dynamic application.

npx create-next-app my-app
cd my-app
npm run dev
or 
yarn create next-app my-app
cd my-app
yarn run dev

Preparation

Setup the Accordion

Smart UI for React is distributed as smart-webcomponents-react package

  1. Download and install the package.

    In your React Next.js project, run one of the following commands to install Smart UI Accordion for React

    With NPM: 

    npm install smart-webcomponents-react
    With Yarn: 
    yarn add smart-webcomponents-react

  2. Once installed, import the React Accordion Component and CSS files in your application and render it. app.js

    import 'smart-webcomponents-react/source/styles/smart.default.css';
import React from "react";
import ReactDOM from 'react-dom/client';
import { Accordion, AccordionItem } from 'smart-webcomponents-react/accordion';

const App = () => {	
	return (
		<div>
			<Accordion>
				<AccordionItem label="First Item">First Item Content.</AccordionItem>
				<AccordionItem label="Second Item">Second Item Content.</AccordionItem>
				<AccordionItem label="Third Item">Third Item Content.</AccordionItem>
				<AccordionItem label="Fourth Item">Fourth Item Content.</AccordionItem>
			</Accordion>
		</div>
	);
}

export default App;

Running the React application

Start the app with 
npm run dev
or 
yarn run dev
and open localhost:3000 in your favorite web browser to see the output.

Setup with Vite

Vite (French word for "quick", pronounced /vit/, like "veet") is a build tool that aims to provide a faster and leaner development experience for modern web projects
With NPM: 
npm create vite@latest
With Yarn: 
yarn create vite
Then follow the prompts and choose React as a project.

Navigate to your project's directory. By default it is 'vite-project' and install Smart UI for React

In your Vite project, run one of the following commands to install Smart UI Accordion for React

With NPM: 

npm install smart-webcomponents-react
With Yarn: 
yarn add smart-webcomponents-react

Open src/App.tsx App.tsx

import 'smart-webcomponents-react/source/styles/smart.default.css';
import React from "react";
import ReactDOM from 'react-dom/client';
import { Accordion, AccordionItem } from 'smart-webcomponents-react/accordion';

const App = () => {	
	return (
		<div>
			<Accordion>
				<AccordionItem label="First Item">First Item Content.</AccordionItem>
				<AccordionItem label="Second Item">Second Item Content.</AccordionItem>
				<AccordionItem label="Third Item">Third Item Content.</AccordionItem>
				<AccordionItem label="Fourth Item">Fourth Item Content.</AccordionItem>
			</Accordion>
		</div>
	);
}

export default App;

Read more about using Smart UI for React: https://www.htmlelements.com/docs/react/.

Getting Started with Vue Accordion Component


Setup Vue with Vite

In this section we will introduce how to scaffold a Vue Single Page Application on your local machine. The created project will be using a build setup based on Vite and allow us to use Vue Single-File Components (SFCs). Run the following command in your command line 
npm create vue@latest
This command will install and execute create-vue, the official Vue project scaffolding tool. You will be presented with prompts for several optional features such as TypeScript and testing support: 
✔ Project name: … 
✔ Add TypeScript? … No / Yes
✔ Add JSX Support? … No / Yes
✔ Add Vue Router for Single Page Application development? … No / Yes
✔ Add Pinia for state management? … No / Yes
✔ Add Vitest for Unit testing? … No / Yes
✔ Add an End-to-End Testing Solution? … No / Cypress / Playwright
✔ Add ESLint for code quality? … No / Yes
✔ Add Prettier for code formatting? … No / Yes

Scaffolding project in ./...
Done.
If you are unsure about an option, simply choose No by hitting enter for now. Once the project is created, follow the instructions to install dependencies and start the dev server: 
cd 
npm install
npm install smart-webcomponents
npm run dev

  • Make Vue ignore custom elements defined outside of Vue (e.g., using the Web Components APIs). Otherwise, it will throw a warning about an Unknown custom element, assuming that you forgot to register a global component or misspelled a component name.

    Open vite.config.js in your favorite text editor and change its contents to the following:

    vite.config.js

    import { fileURLToPath, URL } from 'node:url'

import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [
    vue({
      template: {
        compilerOptions: {
          isCustomElement: tag => tag.startsWith('smart-')
        }
      }
    })
  ],
  resolve: {
    alias: {
      '@': fileURLToPath(new URL('./src', import.meta.url))
    }
  }
})
  • Open src/App.vue in your favorite text editor and change its contents to the following:

    App.vue 

    <template>
  <div class="vue-root">
    <smart-accordion id="accordion">
      <smart-accordion-item label="First Item">First Item Content.</smart-accordion-item>
      <smart-accordion-item label="Second Item">Second Item Content.</smart-accordion-item>
      <smart-accordion-item label="Third Item">Third Item Content.</smart-accordion-item>
      <smart-accordion-item label="Fourth Item">Fourth Item Content.</smart-accordion-item>
    </smart-accordion>
  </div>
</template>

<script>
import { onMounted } from "vue";
import "smart-webcomponents/source/styles/smart.default.css";
import "smart-webcomponents/source/modules/smart.accordion.js";

export default {
  name: "app",
  setup() {
    onMounted(() => {});
  }
};
</script>

<style>
smart-accordion {
  width: 300px;
  height: 500px;
}
</style>
    We can now use the smart-accordion with Vue 3. Data binding and event handlers will just work right out of the box.

Running the Vue application

Start the app with 
npm run dev
and open http://localhost:5173/ in your favorite web browser to see the output below:
When you are ready to ship your app to production, run the following: 
npm run build
This will create a production-ready build of your app in the project's ./dist directory.

Read more about using Smart UI for Vue: https://www.htmlelements.com/docs/vue/.