watson-speech
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IBM Watson Speech to Text and Text to Speech SDK for web browsers.
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<title>JSDoc: Source: speech-to-text/writable-element-stream.js</title>
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<h1 class="page-title">Source: speech-to-text/writable-element-stream.js</h1>
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<pre class="prettyprint source linenums"><code>'use strict';
var Writable = require('stream').Writable;
var util = require('util');
var defaults = require('defaults');
/**
* Writable stream that accepts results in either object or string mode and outputs the text to a supplied html element
*
* Can show interim results when in objectMode
*
* @param {Object} options
* @param {String|DOMElement} options.outputElement
* @param {String} [options.property] what property of the element should the text be set to. Defaults to `value` for `<input>`s and `<textarea>`s, `textContent` for everything else
* @param {Boolean} [options.clear=true] delete any previous text
* @constructor
*/
function WritableElementStream(options) {
this.options = options = defaults(options, {
decodeStrings: false, // false = don't convert strings to buffers before passing to _write (only applies in string mode)
property: null,
clear: true
});
this.el = typeof options.outputElement === 'string' ? document.querySelector(options.outputElement) : options.outputElement;
if (!this.el) {
throw new Error('Watson Speech to Text WritableElementStream: missing outputElement');
}
Writable.call(this, options);
// for most elements we set the textContent, but for form elements, the value property is probably the expected target
var propMap = {
INPUT: 'value',
TEXTAREA: 'value'
};
this.prop = options.property || propMap[this.el.nodeName] || 'textContent';
if (options.clear) {
this.el[this.prop] = '';
}
if (options.objectMode) {
this.finalizedText = this.el[this.prop];
this._write = this.writeObject;
} else {
this._write = this.writeString;
}
}
util.inherits(WritableElementStream, Writable);
WritableElementStream.prototype.writeString = function writeString(text, encoding, next) {
this.el[this.prop] += text;
next();
};
WritableElementStream.prototype.writeObject = function writeObject(data, encoding, next) {
if (Array.isArray(data.results)) {
data.results.forEach(
function(result) {
if (result.final) {
this.finalizedText += result.alternatives[0].transcript;
this.el[this.prop] = this.finalizedText;
} else {
this.el[this.prop] = this.finalizedText + result.alternatives[0].transcript;
}
},
this
);
}
next();
};
module.exports = WritableElementStream;
</code></pre>
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<h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-watson-speech.html">watson-speech</a></li><li><a href="module-watson-speech_speech-to-text.html">watson-speech/speech-to-text</a></li><li><a href="module-watson-speech_speech-to-text_get-models.html">watson-speech/speech-to-text/get-models</a></li><li><a href="module-watson-speech_speech-to-text_recognize-file.html">watson-speech/speech-to-text/recognize-file</a></li><li><a href="module-watson-speech_speech-to-text_recognize-microphone.html">watson-speech/speech-to-text/recognize-microphone</a></li><li><a href="module-watson-speech_text-to-speech.html">watson-speech/text-to-speech</a></li><li><a href="module-watson-speech_text-to-speech_get-voices.html">watson-speech/text-to-speech/get-voices</a></li><li><a href="module-watson-speech_text-to-speech_synthesize.html">watson-speech/text-to-speech/synthesize</a></li></ul><h3>Classes</h3><ul><li><a href="FilePlayer.html">FilePlayer</a></li><li><a href="FormatStream.html">FormatStream</a></li><li><a href="RecognizeStream.html">RecognizeStream</a></li><li><a href="ResultStream.html">ResultStream</a></li><li><a href="SpeakerStream.html">SpeakerStream</a></li><li><a href="TimingStream.html">TimingStream</a></li><li><a href="UrlPlayer.html">UrlPlayer</a></li><li><a href="WebAudioL16Stream.html">WebAudioL16Stream</a></li><li><a href="WritableElementStream.html">WritableElementStream</a></li></ul><h3>Events</h3><ul><li><a href="RecognizeStream.html#event:close">close</a></li><li><a href="RecognizeStream.html#event:data">data</a></li><li><a href="RecognizeStream.html#event:error">error</a></li><li><a href="RecognizeStream.html#event:listening">listening</a></li><li><a href="RecognizeStream.html#event:message">message</a></li><li><a href="RecognizeStream.html#event:open">open</a></li><li><a href="RecognizeStream.html#event:send-data">send-data</a></li><li><a href="RecognizeStream.html#event:send-json">send-json</a></li><li><a href="RecognizeStream.html#event:stop">stop</a></li><li><a href="SpeakerStream.html#event:data">data</a></li></ul><h3>Global</h3><ul><li><a href="global.html#getContentTypeFromFile">getContentTypeFromFile</a></li><li><a href="global.html#playFile">playFile</a></li></ul>
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