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React: playNote() Undefined Function Error


By : mayo
Date : September 15 2020, 03:00 AM
This might help you You do not need to attach click listener outside component. Do right inside jsx/html
code :
class Piano extends Component {

    playNote = (id) => {
        const noteAudio = document.getElementById(id);
        noteAudio.play();
    };

    render() {
        return (
            <Fragment>
            <div class="piano">
                <div data-note="C" className="key white" onClick={() => this.playNote('C')}></div>
                <div data-note="Db" className="key black" onClick={() => this.playNote('Db')}></div>
                
            </div>

            <audio id="C" src="../notes/C.mp3"></audio>
            <audio id="Db" src="../notes/Db.mp3"></audio>
            <audio id="D" src="../notes/D.mp3"></audio>
            <audio id="Eb" src="../notes/Eb.mp3"></audio>
            <audio id="E" src="../notes/E.mp3"></audio>
            <audio id="F" src="../notes/F.mp3"></audio>
            <audio id="Gb" src="../notes/Gb.mp3"></audio>
            <audio id="G" src="../notes/G.mp3"></audio>
            <audio id="Ab" src="../notes/Ab.mp3"></audio>
            <audio id="A" src="../notes/A.mp3"></audio>
            <audio id="Bb" src="../notes/Bb.mp3"></audio>
            <audio id="B" src="../notes/B.mp3"></audio>

            </Fragment>
        )
    }
}

export default Piano


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React Native undefined is not a function error


By : Jannine
Date : March 29 2020, 07:55 AM
With these it helps I am new to react native this is my first attempt in react native I was following a sample tutorial for the basic understanding of the code and other things I am following this raywenderlich's propertyfinder example, while implementing the first navigation example I am facing this issue: , You for got to write renderScene function, see following example:
code :
<ReactNative.Navigator
  ...
  renderScene={this.renderScene.bind(this)} />


renderScene(route, navigationOperations, onComponentRef) {
  switch(route.index) {
    case 0:
      return <SearchPage />
  }
}

Error: Undefined is not a function - React Native


By : Cátia Valéria Amaral
Date : March 29 2020, 07:55 AM
it helps some times I created a simple activity where in if you press inside the circular area, the text in it should change accordingly. The app runs well but when I press inside the circular area, I get an error saying "undefined is not a function ( evaluating 'this.setState( {pressing: true});' ) ". Also, the text inside the circular area should be initially set but it is empty. You can see the activity here. The code is also provided below: , The issue is here:
code :
<TouchableHighlight onPressIn={this._inPress}
onPressOut={this._outPress}  style={styles.toucher}>
<TouchableHighlight onPressIn={this._inPress.bind(this)}
   onPressOut={this._outPress.bind(this)}  style={styles.toucher}>
 <TouchableHighlight onPressIn={() => this._inPress()}
       onPressOut={() => this._outPress()}  style={styles.toucher}>

Using any form of the Map function with react causes an undefined error


By : Silva de Vuple
Date : March 29 2020, 07:55 AM
This might help you The createElement method is the primary method React uses to build components, it's undefined because the React object isn't being imported:
code :
import React, { Component } from 'react';

React Native error undefined is not a function


By : user3633957
Date : March 29 2020, 07:55 AM
To fix this issue The problem is that you have declared a function named fetch and you are trying to use the fetch function of the Fetch API, which has the same name.

React Native error: undefined is not a function


By : Ian
Date : March 29 2020, 07:55 AM
I wish did fix the issue. This doesn't really answer your question, but why do it this way using deprecated syntax?
Try the facebook react-native tutorial here: https://facebook.github.io/react-native/docs/tutorial.html
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