264 lines
9.3 KiB
JavaScript
264 lines
9.3 KiB
JavaScript
/**
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* termynal.js
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* A lightweight, modern and extensible animated terminal window, using
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* async/await.
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*
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* @author Ines Montani <ines@ines.io>
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* @version 0.0.1
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* @license MIT
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*/
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'use strict';
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/** Generate a terminal widget. */
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class Termynal {
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/**
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* Construct the widget's settings.
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* @param {(string|Node)=} container - Query selector or container element.
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* @param {Object=} options - Custom settings.
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* @param {string} options.prefix - Prefix to use for data attributes.
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* @param {number} options.startDelay - Delay before animation, in ms.
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* @param {number} options.typeDelay - Delay between each typed character, in ms.
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* @param {number} options.lineDelay - Delay between each line, in ms.
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* @param {number} options.progressLength - Number of characters displayed as progress bar.
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* @param {string} options.progressChar – Character to use for progress bar, defaults to █.
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* @param {number} options.progressPercent - Max percent of progress.
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* @param {string} options.cursor – Character to use for cursor, defaults to ▋.
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* @param {Object[]} lineData - Dynamically loaded line data objects.
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* @param {boolean} options.noInit - Don't initialise the animation.
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*/
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constructor(container = '#termynal', options = {}) {
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this.container = (typeof container === 'string') ? document.querySelector(container) : container;
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this.pfx = `data-${options.prefix || 'ty'}`;
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this.originalStartDelay = this.startDelay = options.startDelay
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|| parseFloat(this.container.getAttribute(`${this.pfx}-startDelay`)) || 600;
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this.originalTypeDelay = this.typeDelay = options.typeDelay
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|| parseFloat(this.container.getAttribute(`${this.pfx}-typeDelay`)) || 90;
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this.originalLineDelay = this.lineDelay = options.lineDelay
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|| parseFloat(this.container.getAttribute(`${this.pfx}-lineDelay`)) || 1500;
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this.progressLength = options.progressLength
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|| parseFloat(this.container.getAttribute(`${this.pfx}-progressLength`)) || 40;
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this.progressChar = options.progressChar
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|| this.container.getAttribute(`${this.pfx}-progressChar`) || '█';
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this.progressPercent = options.progressPercent
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|| parseFloat(this.container.getAttribute(`${this.pfx}-progressPercent`)) || 100;
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this.cursor = options.cursor
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|| this.container.getAttribute(`${this.pfx}-cursor`) || '▋';
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this.lineData = this.lineDataToElements(options.lineData || []);
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this.loadLines()
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if (!options.noInit) this.init()
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}
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loadLines() {
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// Load all the lines and create the container so that the size is fixed
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// Otherwise it would be changing and the user viewport would be constantly
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// moving as she/he scrolls
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const finish = this.generateFinish()
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finish.style.visibility = 'hidden'
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this.container.appendChild(finish)
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// Appends dynamically loaded lines to existing line elements.
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this.lines = [...this.container.querySelectorAll(`[${this.pfx}]`)].concat(this.lineData);
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for (let line of this.lines) {
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line.style.visibility = 'hidden'
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this.container.appendChild(line)
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}
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const restart = this.generateRestart()
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restart.style.visibility = 'hidden'
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this.container.appendChild(restart)
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this.container.setAttribute('data-termynal', '');
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}
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/**
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* Initialise the widget, get lines, clear container and start animation.
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*/
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init() {
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/**
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* Calculates width and height of Termynal container.
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* If container is empty and lines are dynamically loaded, defaults to browser `auto` or CSS.
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*/
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const containerStyle = getComputedStyle(this.container);
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this.container.style.width = containerStyle.width !== '0px' ?
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containerStyle.width : undefined;
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this.container.style.minHeight = containerStyle.height !== '0px' ?
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containerStyle.height : undefined;
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this.container.setAttribute('data-termynal', '');
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this.container.innerHTML = '';
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for (let line of this.lines) {
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line.style.visibility = 'visible'
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}
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this.start();
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}
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/**
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* Start the animation and rener the lines depending on their data attributes.
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*/
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async start() {
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this.addFinish()
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await this._wait(this.startDelay);
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for (let line of this.lines) {
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const type = line.getAttribute(this.pfx);
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const delay = line.getAttribute(`${this.pfx}-delay`) || this.lineDelay;
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if (type == 'input') {
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line.setAttribute(`${this.pfx}-cursor`, this.cursor);
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await this.type(line);
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await this._wait(delay);
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}
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else if (type == 'progress') {
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await this.progress(line);
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await this._wait(delay);
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}
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else {
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this.container.appendChild(line);
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await this._wait(delay);
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}
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line.removeAttribute(`${this.pfx}-cursor`);
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}
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this.addRestart()
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this.finishElement.style.visibility = 'hidden'
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this.lineDelay = this.originalLineDelay
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this.typeDelay = this.originalTypeDelay
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this.startDelay = this.originalStartDelay
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}
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generateRestart() {
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const restart = document.createElement('a')
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restart.onclick = (e) => {
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e.preventDefault()
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this.container.innerHTML = ''
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this.init()
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}
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restart.href = '#'
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restart.setAttribute('data-terminal-control', '')
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restart.innerHTML = "restart ↻"
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return restart
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}
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generateFinish() {
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const finish = document.createElement('a')
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finish.onclick = (e) => {
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e.preventDefault()
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this.lineDelay = 0
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this.typeDelay = 0
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this.startDelay = 0
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}
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finish.href = '#'
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finish.setAttribute('data-terminal-control', '')
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finish.innerHTML = "fast →"
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this.finishElement = finish
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return finish
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}
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addRestart() {
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const restart = this.generateRestart()
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this.container.appendChild(restart)
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}
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addFinish() {
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const finish = this.generateFinish()
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this.container.appendChild(finish)
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}
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/**
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* Animate a typed line.
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* @param {Node} line - The line element to render.
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*/
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async type(line) {
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const chars = [...line.textContent];
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line.textContent = '';
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this.container.appendChild(line);
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for (let char of chars) {
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const delay = line.getAttribute(`${this.pfx}-typeDelay`) || this.typeDelay;
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await this._wait(delay);
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line.textContent += char;
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}
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}
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/**
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* Animate a progress bar.
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* @param {Node} line - The line element to render.
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*/
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async progress(line) {
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const progressLength = line.getAttribute(`${this.pfx}-progressLength`)
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|| this.progressLength;
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const progressChar = line.getAttribute(`${this.pfx}-progressChar`)
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|| this.progressChar;
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const chars = progressChar.repeat(progressLength);
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const progressPercent = line.getAttribute(`${this.pfx}-progressPercent`)
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|| this.progressPercent;
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line.textContent = '';
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this.container.appendChild(line);
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for (let i = 1; i < chars.length + 1; i++) {
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await this._wait(this.typeDelay);
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const percent = Math.round(i / chars.length * 100);
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line.textContent = `${chars.slice(0, i)} ${percent}%`;
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if (percent>progressPercent) {
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break;
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}
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}
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}
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/**
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* Helper function for animation delays, called with `await`.
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* @param {number} time - Timeout, in ms.
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*/
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_wait(time) {
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return new Promise(resolve => setTimeout(resolve, time));
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}
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/**
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* Converts line data objects into line elements.
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*
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* @param {Object[]} lineData - Dynamically loaded lines.
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* @param {Object} line - Line data object.
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* @returns {Element[]} - Array of line elements.
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*/
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lineDataToElements(lineData) {
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return lineData.map(line => {
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let div = document.createElement('div');
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div.innerHTML = `<span ${this._attributes(line)}>${line.value || ''}</span>`;
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return div.firstElementChild;
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});
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}
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/**
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* Helper function for generating attributes string.
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*
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* @param {Object} line - Line data object.
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* @returns {string} - String of attributes.
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*/
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_attributes(line) {
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let attrs = '';
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for (let prop in line) {
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// Custom add class
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if (prop === 'class') {
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attrs += ` class=${line[prop]} `
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continue
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}
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if (prop === 'type') {
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attrs += `${this.pfx}="${line[prop]}" `
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} else if (prop !== 'value') {
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attrs += `${this.pfx}-${prop}="${line[prop]}" `
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}
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}
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return attrs;
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}
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}
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/**
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* HTML API: If current script has container(s) specified, initialise Termynal.
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*/
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if (document.currentScript.hasAttribute('data-termynal-container')) {
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const containers = document.currentScript.getAttribute('data-termynal-container');
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containers.split('|')
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.forEach(container => new Termynal(container))
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}
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