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stt speech-to-text native browser web speech api #js
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| <!doctype html> | |
| <html lang="de"> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5, minimum-scale=1" /> | |
| <title>Web Speech API</title> | |
| <script> | |
| class STT { | |
| static instances = []; | |
| labels = { | |
| RECORDING_STARTED: '🎤 Aufnahme läuft...', | |
| RECORDING_STOPPED: '⏸ Aufnahme gestoppt', | |
| TALK_NOW: 'Sprechen Sie jetzt', | |
| BUTTON_START: '▶️ Start', | |
| BUTTON_STOP: '⏸ Stop', | |
| ERROR: '❌ Fehler', | |
| MESSAGE_SENT: '✅ Nachricht gesendet.', | |
| NOT_SUPPORTED: '⛔ Browser unterstützt keine Spracheingabe!' | |
| }; | |
| init($el) { | |
| STT.instances.push(this); | |
| // outer wrap textarea | |
| this.$wrapper = new DOMParser().parseFromString( | |
| '<div class="stt-wrapper"></div>', | |
| 'text/html' | |
| ).body.childNodes[0]; | |
| $el.parentNode.insertBefore(this.$wrapper, $el.nextSibling); | |
| this.$wrapper.appendChild($el); | |
| this.autostart = $el.hasAttribute('data-autostart'); | |
| this.setupSpeech(); | |
| this.bindEvents(); | |
| if (this.autostart) { | |
| this.startListening(); | |
| } | |
| } | |
| setupSpeech() { | |
| this.$wrapper.insertAdjacentHTML( | |
| 'beforeend', | |
| ` | |
| <button class="toggle">${this.autostart ? this.labels.BUTTON_STOP : this.labels.BUTTON_START}</button> | |
| <div class="status">...</div> | |
| ` | |
| ); | |
| this.$textarea = this.$wrapper.querySelector('textarea'); | |
| this.$status = this.$wrapper.querySelector('.status'); | |
| this.$toggleButton = this.$wrapper.querySelector('.toggle'); | |
| this.SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition; | |
| this.isListening = false; | |
| this.shouldRestart = false; | |
| if (!this.SpeechRecognition) { | |
| this.$status.textContent = this.labels.NOT_SUPPORTED; | |
| this.$toggleButton.disabled = true; | |
| return; | |
| } | |
| this.recognition = new this.SpeechRecognition(); | |
| this.recognition.lang = 'de-DE'; | |
| this.recognition.continuous = true; | |
| this.recognition.interimResults = true; | |
| } | |
| bindEvents() { | |
| this.recognition.onresult = event => { | |
| let interimTranscript = ''; | |
| let hasFinal = false; | |
| for (let i = event.resultIndex; i < event.results.length; i++) { | |
| let transcript = event.results[i][0].transcript; | |
| if (event.results[i].isFinal) { | |
| hasFinal = true; | |
| } else { | |
| interimTranscript += transcript; | |
| } | |
| } | |
| if (interimTranscript) { | |
| let text = interimTranscript.trim(); | |
| this.$textarea.value = text; | |
| } | |
| if (hasFinal) { | |
| this.$status.textContent = this.labels.MESSAGE_SENT; | |
| setTimeout(() => { | |
| this.$textarea.value = ''; | |
| if (this.isListening) { | |
| this.$status.textContent = | |
| this.labels.RECORDING_STARTED + ' ' + this.labels.TALK_NOW; | |
| } else { | |
| this.$status.textContent = this.labels.RECORDING_STOPPED; | |
| } | |
| }, 1000); | |
| if (this.$wrapper.closest('form')) { | |
| this.$wrapper.closest('form').dispatchEvent(new Event('submit', { bubbles: true })); | |
| } | |
| } | |
| if (!hasFinal && interimTranscript) { | |
| this.$status.textContent = this.labels.RECORDING_STARTED; | |
| } | |
| }; | |
| this.recognition.onerror = event => { | |
| this.$status.textContent = this.labels.ERROR + ': ' + event.error; | |
| }; | |
| this.recognition.onend = () => { | |
| if (this.shouldRestart && this.isListening) { | |
| this.recognition.start(); | |
| } | |
| }; | |
| this.$toggleButton.addEventListener('click', e => { | |
| e.preventDefault(); | |
| if (this.isListening) { | |
| this.stopListening(); | |
| } else { | |
| this.startListening(); | |
| } | |
| }); | |
| } | |
| startListening() { | |
| STT.instances.forEach(instances__value => { | |
| if (instances__value !== this && instances__value.isListening) { | |
| instances__value.stopListening(); | |
| } | |
| }); | |
| this.shouldRestart = true; | |
| this.isListening = true; | |
| this.recognition.start(); | |
| this.$toggleButton.textContent = this.labels.BUTTON_STOP; | |
| this.$status.textContent = this.labels.RECORDING_STARTED + ' ' + this.labels.TALK_NOW; | |
| } | |
| stopListening() { | |
| this.shouldRestart = false; | |
| this.isListening = false; | |
| this.recognition.stop(); | |
| this.$toggleButton.textContent = this.labels.BUTTON_START; | |
| this.$status.textContent = this.labels.RECORDING_STOPPED; | |
| } | |
| } | |
| window.addEventListener('load', e => { | |
| if (document.querySelector('.stt') !== null) { | |
| document.querySelectorAll('.stt').forEach($el => { | |
| let stt = new STT(); | |
| stt.init($el); | |
| }); | |
| } | |
| }); | |
| </script> | |
| <style> | |
| textarea { | |
| width: 100%; | |
| height: 300px; | |
| display: block; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <form> | |
| <textarea class="stt" data-autostart></textarea> | |
| </form> | |
| <form> | |
| <textarea class="stt"></textarea> | |
| </form> | |
| </body> | |
| </html> |
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