I am working on a project wherein I am connected to a Scanner. Scanner, when scanned, will send the text. Right now I am having a Text Input (hidden) field to get the details from the Scanner but the issue I am facing is Keyboard is getting displayed when the Text Input got focus. I have tried to use Keyboard.dismiss() but this is removing the focus also from TextInput (and now the text returned from Scanner is no longer listened by the TextInput). How can I approach this problem?
Following is the code
<TextInput
style={Style.hiddenInput}
autoFocus={true}
multiline
onFocus={Keyboard.dismiss}
onChangeText={this._onHiddenTextChangeText}
value={this.state.hiddenInput}
/>
Styles
hiddenInput: {
width: 0,
height: 0,
},
I resolved this issue by adding the Native Package. I have added the example in the following github link
https://github.com/mohanprasathsj/reactnative-hidekeyboardonfocusexample
<View style={{width:0,height:0}}>
<TextInput
style={Style.hiddenInput}
autoFocus={true}
multiline
onFocus={Keyboard.dismiss}
onChangeText={this._onHiddenTextChangeText}
value={this.state.hiddenInput}
/>
</View>
Best approach I can think of is to copy the scanned value to Clipboard (Possibly using the Scanner Settings) and check the data from Clipboard continuously.
componentDidMount() {
this.getReadyToScan();
}
getReadyToScan() {
try {
let content = await Clipboard.getString();
// Do whatever you want
Clipboard.setString('');
} catch (e) {
Clipboard.setString('');
} finally {
// Adding a little bit of sleep
setTimeout(() => this.getReadyToScan(), 200);
}
}
There is request to add keyboard='none' to React-Native's TextInput but they have not gone around it yet.
Related
I'm creating a note taking app on React Native, and at the moment the text editor is an enhanced TextInput with some extra functionalities like copying, pasting, inserting dates, etc.
The problem is that this is very limited as I can't add line numbers, nor change styles, coloring text, etc. Performance is also a concern for big documents.
I'm experimenting with splitting the text into lines and create one text input per line, but some problems appear: I can't select text across lines, I have to handle individual keystrokes to catch line breaks, the cursor won't move between text inputs, etc.
Another problem is that I can catch soft keyboard events, but no physical keyboard events, as per the onKeyPress documentation.
I wonder whether there is a good solution for this as it seems right now that using TextInputs won't allow me to do what I need.
A good answer would be either a good library, or directions on how to do this by hand, directly using components and catching keyboard events (assuming that this is even possible).
For clarification, I don't want a rich text editor library, I want the tools to build it. I also don't want to use a webview.
This is is the best thing I have found so far. It consists on adding Text components as children to the TextInput. It dates from 2015 and does not fully solve the problem though, but it's a start.
<TextInput
ref={this.textInputRef}
style={styles.input}
multiline={true}
scrollEnabled={true}
onChangeText={this.onChangeText}
>{
lines.map((line, index) => {
return <Text>{line + '\n'}</Text>;
})
}</TextInput>
It also confirms that this is not a trivial thing to do in React Native.
Commit in the React Native GitHub repository: Added rich text input support
According to this, images can be added too (but I haven't tested it).
I will edit if I find something else.
I will update later (I have to go to work), so I will post what I have and leave comments on what I was thinking
import React, {
useState, useEffect, useRef,
} from 'react';
import {
View, StyleSheet, TextInput, Text, useWindowDimensions,
KeyboardAvoidingView, ScrollView
} from 'react-native';
const TextEditor = ({lineHeight=20}) => {
const { height, width } = useWindowDimensions()
// determine max number of TextInputs you can make
const maxLines = Math.floor(height/lineHeight);
const [ textLines, setTextLines ] = useState(Array(maxLines).fill(''));
return (
<KeyboardAvoidingView
style={styles.container}
behavior={"height"}
>
<ScrollView style={{height:height,width:'100%'}}>
{/*Make TextInputs to fill whole screen*/}
<View style={{justifyContent:'flex-end'}}>
{textLines.map((text,i)=>{
let style = [styles.textInput,{height:lineHeight}]
// if first line give it extra space to look like notebook paper
if(i ==0)
style.push({height:lineHeight*3,paddingTop:lineHeight*2})
return (
<>
<TextInput
style={style}
onChangeText={newVal=>{
textLines[i] = newVal
setTextLines(textLines)
}}
key={"textinput-"+i}
/>
</>
)
})}
</View>
</ScrollView>
</KeyboardAvoidingView>
)
}
const styles = StyleSheet.create({
container:{
flex:1,
// paddingTop:40
},
textInput:{
padding:0,
margin:0,
borderBottomColor:'lightblue',
borderBottomWidth:1,
width:'100%',
}
})
export default TextEditor
Here's what I'm thinking:
wrap this in a ScrollView and use onEndReached prop to render an additional TextInput if the last TextInput is in focused and has reached maxed character limit
store all textinput values in an array
The following is a first attempt at learning to simply change the style of an element onPress in react native. Being well versed in web languages I am finding it difficult as it is not as straight forward.
For reasons as yet unknown, the element requires two clicks in order to execute.
export class NavTabItem extends React.Component {
constructor(props) {
super(props);
this.state = {
active: false
}
this.NavTabAction = this.NavTabAction.bind(this)
}
NavTabAction = (elem) => {
elem.setState({active: !elem.state.active})
}
render() {
return (
<TouchableOpacity
style={this.state.active ? styles.NavTabItemSelected : styles.NavTabItem}
onPress={()=> {
this.NavTabAction(this)
}}>
<View style={styles.NavTabIcon} />
<Text style={styles.NavTabLabel}>{this.props.children}</Text>
</TouchableOpacity>
);
}
}
Other issues:
I also have not worked out how a means of setting the active state to false for other elements under the parent on click.
Additionally, Is there a simple way to affect the style of child elements like with the web. At the moment I cannot see a means of a parent style affecting a child element through selectors like you can with CSS
eg. a stylesheet that read NavTabItemSelected Text :{ // active style for <Text> }
Instead of calling elem.setState or elem.state, it should be this.setState and elem.state.
NavTabAction = (elem) => {
this.setState(prev => ({...prev, active: !prev.active}))
}
And instead of passing this in the onPress, you should just pass the function's reference.
onPress={this.NavTabAction}>
You should also remove this line because you are using arrow function
// no need to bind when using arrow functions
this.NavTabAction = this.NavTabAction.bind(this)
Additionally, Is there a simple way to affect the style of child elements like with the web
You could check styled-component, but I think that feature don't exists yet for react native. What you should do is pass props down to child components.
Thanks to everyone for their help with this and sorting out some other bits and pieces with the code.
The issue in question however was that the style was changing on the second click. A few hours later and I have a cause and a solution for anyone suffering from this. Should any of the far more experienced people who have answered this question believe this answer is incorrect or they have a better one, please post it but for now here is the only way I have found to fix it.
The cause:
Using setState was correctly re rendering the variables. This could both be seen in the console via console.log() and directly outputted in the render making them visible.
However, no matter what was tried, this did not update the style. Whether it was a style name from the Stylesheet or inline styles, they would update on the second click rather than the first but still to the parameters of the first. So if the first click should make a button turn from red to green, it would not do so even though the new state had rendered. However if a subsequent click should have turned the button back to red then the button would now go green (like it should have for the first click). It would then go red on the third click seemingly always one step behind the status passed to it.
Solution
To fix this, take the style off the the primary element (forgive terminology, someone edit), in my case, the TouchableOpacity element. Add in a child View element and place the styles on that View element instead along with the ternary operator and wallah.
It seems any change to status on the effective master element or container if you prefer, only takes affect after another render, not that contained in setStatus.
Final code:
export class NavTabItem extends React.Component {
constructor(props) {
super(props);
this.state = {
active: false
}
}
NavTabAction = () => {
this.setState({active: !this.state.active})
}
render() {
this.state.active == true ? console.log("selected") : console.log("unselected")
return (
<TouchableOpacity onPress={this.NavTabAction}>
// added View containing style and ternary operator
<View style={this.state.active == true ? styles.NavTabItemSelected : styles.NavTabItem}>
<View style={styles.NavTabIcon} />
<TextCap11 style={styles.NavTabLabel}>{this.props.children}</TextCap11>
</View>
// End added view
</TouchableOpacity>
);
}
}
when its changed source of any image in component there is blinking occurs which I try to avoid.
To do so I searched and decided to use ref(direct manipulation)
but it doenst change anything, so I use traditional way, changing url property in the state, it works but blink occurs.
Changing image source, fired when image started to move;("onPanResponderStart") function. here is code;
onPanResponderStart:(e, gesture)=>{
//not change image!
// this.refs['refTabure'].setNativeProps({
// source: require('../newImage.png')
// });
//it works, but blink occurs
this.setState({tabureSagImageUrl:require('../newImage.png')})
},
...
return (
<View style={styles.TabureStyle}>
<Animated.Image ref="refTabure" style={[panStyle, styles[this.props.Name], {opacity:this.state.opacity}]}
{...this.panResponder.panHandlers}
source={this.state.tabureSagImageUrl}>
</Animated.Image>
</View>
);
how can I edit the source of image without rerendering component that cause blinking ?
I need to disable emojis for my react native keyboard app. When my keyboard appear, the emoji icon is visible and i need to make it unavailable to prevent user to insert emojis in texts.
Any suggestions ?
The exact way to disable emoji is to set 'ascii-capable' for iOS and 'visible-password' for Android to TextInput Props keyboardType.
<TextInput
keyboardType={Platform.OS === 'ios' ? 'ascii-capable' : 'visible-password'}
/>
This is what I got when attempting this problem:
the keyboardType="ascii-capable" does not work on Android because it is specific to iOS only accordding to https://facebook.github.io/react-native/docs/textinput#keyboardtype
using keyboardType="email-address" does not hide the emoji button in every keyboard on Android
My solution to the above limitations was to remove any emoji character that the might be entered. To do that, I did the following:
Search for a regex that covers most of the emoji unicodes. After trying a number of regex, I ended up using the one this https://github.com/mathiasbynens/emoji-regex. It's not perfect but it covers most emojis.
Create a function that runs every time a new value is entered
Use the function in the Text Input value prop
Function:
const removeEmojis = (string) => {
// emoji regex from the emoji-regex library
const regex = /\uD83C\uDFF4(?:\uDB40\uDC67\uDB40\uDC62(?:\uDB40\uDC65\uDB40\uDC6E\uDB40\uDC67|\uDB40\uDC77\uDB40\uDC6C\uDB40\uDC73|\uDB40\uDC73\uDB40\uDC63\uDB40\uDC74)\uDB40\uDC7F|\u200D\u2620\uFE0F)|\uD83D\uDC69\u200D\uD83D\uDC69\u200D(?:\uD83D\uDC66\u200D\uD83D\uDC66|\uD83D\uDC67\u200D(?:\uD83D[\uDC66\uDC67]))|\uD83D\uDC68(?:\u200D(?:\u2764\uFE0F\u200D(?:\uD83D\uDC8B\u200D)?\uD83D\uDC68|(?:\uD83D[\uDC68\uDC69])\u200D(?:\uD83D\uDC66\u200D\uD83D\uDC66|\uD83D\uDC67\u200D(?:\uD83D[\uDC66\uDC67]))|\uD83D\uDC66\u200D\uD83D\uDC66|\uD83D\uDC67\u200D(?:\uD83D[\uDC66\uDC67])|\uD83C[\uDF3E\uDF73\uDF93\uDFA4\uDFA8\uDFEB\uDFED]|\uD83D[\uDCBB\uDCBC\uDD27\uDD2C\uDE80\uDE92]|\uD83E[\uDDB0-\uDDB3])|(?:\uD83C[\uDFFB-\uDFFF])\u200D(?:\uD83C[\uDF3E\uDF73\uDF93\uDFA4\uDFA8\uDFEB\uDFED]|\uD83D[\uDCBB\uDCBC\uDD27\uDD2C\uDE80\uDE92]|\uD83E[\uDDB0-\uDDB3]))|\uD83D\uDC69\u200D(?:\u2764\uFE0F\u200D(?:\uD83D\uDC8B\u200D(?:\uD83D[\uDC68\uDC69])|\uD83D[\uDC68\uDC69])|\uD83C[\uDF3E\uDF73\uDF93\uDFA4\uDFA8\uDFEB\uDFED]|\uD83D[\uDCBB\uDCBC\uDD27\uDD2C\uDE80\uDE92]|\uD83E[\uDDB0-\uDDB3])|\uD83D\uDC69\u200D\uD83D\uDC66\u200D\uD83D\uDC66|(?:\uD83D\uDC41\uFE0F\u200D\uD83D\uDDE8|\uD83D\uDC69(?:\uD83C[\uDFFB-\uDFFF])\u200D[\u2695\u2696\u2708]|\uD83D\uDC68(?:(?:\uD83C[\uDFFB-\uDFFF])\u200D[\u2695\u2696\u2708]|\u200D[\u2695\u2696\u2708])|(?:(?:\u26F9|\uD83C[\uDFCB\uDFCC]|\uD83D\uDD75)\uFE0F|\uD83D\uDC6F|\uD83E[\uDD3C\uDDDE\uDDDF])\u200D[\u2640\u2642]|(?:\u26F9|\uD83C[\uDFCB\uDFCC]|\uD83D\uDD75)(?:\uD83C[\uDFFB-\uDFFF])\u200D[\u2640\u2642]|(?:\uD83C[\uDFC3\uDFC4\uDFCA]|\uD83D[\uDC6E\uDC71\uDC73\uDC77\uDC81\uDC82\uDC86\uDC87\uDE45-\uDE47\uDE4B\uDE4D\uDE4E\uDEA3\uDEB4-\uDEB6]|\uD83E[\uDD26\uDD37-\uDD39\uDD3D\uDD3E\uDDB8\uDDB9\uDDD6-\uDDDD])(?:(?:\uD83C[\uDFFB-\uDFFF])\u200D[\u2640\u2642]|\u200D[\u2640\u2642])|\uD83D\uDC69\u200D[\u2695\u2696\u2708])\uFE0F|\uD83D\uDC69\u200D\uD83D\uDC67\u200D(?:\uD83D[\uDC66\uDC67])|\uD83D\uDC69\u200D\uD83D\uDC69\u200D(?:\uD83D[\uDC66\uDC67])|\uD83D\uDC68(?:\u200D(?:(?:\uD83D[\uDC68\uDC69])\u200D(?:\uD83D[\uDC66\uDC67])|\uD83D[\uDC66\uDC67])|\uD83C[\uDFFB-\uDFFF])|\uD83C\uDFF3\uFE0F\u200D\uD83C\uDF08|\uD83D\uDC69\u200D\uD83D\uDC67|\uD83D\uDC69(?:\uD83C[\uDFFB-\uDFFF])\u200D(?:\uD83C[\uDF3E\uDF73\uDF93\uDFA4\uDFA8\uDFEB\uDFED]|\uD83D[\uDCBB\uDCBC\uDD27\uDD2C\uDE80\uDE92]|\uD83E[\uDDB0-\uDDB3])|\uD83D\uDC69\u200D\uD83D\uDC66|\uD83C\uDDF6\uD83C\uDDE6|\uD83C\uDDFD\uD83C\uDDF0|\uD83C\uDDF4\uD83C\uDDF2|\uD83D\uDC69(?:\uD83C[\uDFFB-\uDFFF])|\uD83C\uDDED(?:\uD83C[\uDDF0\uDDF2\uDDF3\uDDF7\uDDF9\uDDFA])|\uD83C\uDDEC(?:\uD83C[\uDDE6\uDDE7\uDDE9-\uDDEE\uDDF1-\uDDF3\uDDF5-\uDDFA\uDDFC\uDDFE])|\uD83C\uDDEA(?:\uD83C[\uDDE6\uDDE8\uDDEA\uDDEC\uDDED\uDDF7-\uDDFA])|\uD83C\uDDE8(?:\uD83C[\uDDE6\uDDE8\uDDE9\uDDEB-\uDDEE\uDDF0-\uDDF5\uDDF7\uDDFA-\uDDFF])|\uD83C\uDDF2(?:\uD83C[\uDDE6\uDDE8-\uDDED\uDDF0-\uDDFF])|\uD83C\uDDF3(?:\uD83C[\uDDE6\uDDE8\uDDEA-\uDDEC\uDDEE\uDDF1\uDDF4\uDDF5\uDDF7\uDDFA\uDDFF])|\uD83C\uDDFC(?:\uD83C[\uDDEB\uDDF8])|\uD83C\uDDFA(?:\uD83C[\uDDE6\uDDEC\uDDF2\uDDF3\uDDF8\uDDFE\uDDFF])|\uD83C\uDDF0(?:\uD83C[\uDDEA\uDDEC-\uDDEE\uDDF2\uDDF3\uDDF5\uDDF7\uDDFC\uDDFE\uDDFF])|\uD83C\uDDEF(?:\uD83C[\uDDEA\uDDF2\uDDF4\uDDF5])|\uD83C\uDDF8(?:\uD83C[\uDDE6-\uDDEA\uDDEC-\uDDF4\uDDF7-\uDDF9\uDDFB\uDDFD-\uDDFF])|\uD83C\uDDEE(?:\uD83C[\uDDE8-\uDDEA\uDDF1-\uDDF4\uDDF6-\uDDF9])|\uD83C\uDDFF(?:\uD83C[\uDDE6\uDDF2\uDDFC])|\uD83C\uDDEB(?:\uD83C[\uDDEE-\uDDF0\uDDF2\uDDF4\uDDF7])|\uD83C\uDDF5(?:\uD83C[\uDDE6\uDDEA-\uDDED\uDDF0-\uDDF3\uDDF7-\uDDF9\uDDFC\uDDFE])|\uD83C\uDDE9(?:\uD83C[\uDDEA\uDDEC\uDDEF\uDDF0\uDDF2\uDDF4\uDDFF])|\uD83C\uDDF9(?:\uD83C[\uDDE6\uDDE8\uDDE9\uDDEB-\uDDED\uDDEF-\uDDF4\uDDF7\uDDF9\uDDFB\uDDFC\uDDFF])|\uD83C\uDDE7(?:\uD83C[\uDDE6\uDDE7\uDDE9-\uDDEF\uDDF1-\uDDF4\uDDF6-\uDDF9\uDDFB\uDDFC\uDDFE\uDDFF])|[#\*0-9]\uFE0F\u20E3|\uD83C\uDDF1(?:\uD83C[\uDDE6-\uDDE8\uDDEE\uDDF0\uDDF7-\uDDFB\uDDFE])|\uD83C\uDDE6(?:\uD83C[\uDDE8-\uDDEC\uDDEE\uDDF1\uDDF2\uDDF4\uDDF6-\uDDFA\uDDFC\uDDFD\uDDFF])|\uD83C\uDDF7(?:\uD83C[\uDDEA\uDDF4\uDDF8\uDDFA\uDDFC])|\uD83C\uDDFB(?:\uD83C[\uDDE6\uDDE8\uDDEA\uDDEC\uDDEE\uDDF3\uDDFA])|\uD83C\uDDFE(?:\uD83C[\uDDEA\uDDF9])|(?:\uD83C[\uDFC3\uDFC4\uDFCA]|\uD83D[\uDC6E\uDC71\uDC73\uDC77\uDC81\uDC82\uDC86\uDC87\uDE45-\uDE47\uDE4B\uDE4D\uDE4E\uDEA3\uDEB4-\uDEB6]|\uD83E[\uDD26\uDD37-\uDD39\uDD3D\uDD3E\uDDB8\uDDB9\uDDD6-\uDDDD])(?:\uD83C[\uDFFB-\uDFFF])|(?:\u26F9|\uD83C[\uDFCB\uDFCC]|\uD83D\uDD75)(?:\uD83C[\uDFFB-\uDFFF])|(?:[\u261D\u270A-\u270D]|\uD83C[\uDF85\uDFC2\uDFC7]|\uD83D[\uDC42\uDC43\uDC46-\uDC50\uDC66\uDC67\uDC70\uDC72\uDC74-\uDC76\uDC78\uDC7C\uDC83\uDC85\uDCAA\uDD74\uDD7A\uDD90\uDD95\uDD96\uDE4C\uDE4F\uDEC0\uDECC]|\uD83E[\uDD18-\uDD1C\uDD1E\uDD1F\uDD30-\uDD36\uDDB5\uDDB6\uDDD1-\uDDD5])(?:\uD83C[\uDFFB-\uDFFF])|(?:[\u231A\u231B\u23E9-\u23EC\u23F0\u23F3\u25FD\u25FE\u2614\u2615\u2648-\u2653\u267F\u2693\u26A1\u26AA\u26AB\u26BD\u26BE\u26C4\u26C5\u26CE\u26D4\u26EA\u26F2\u26F3\u26F5\u26FA\u26FD\u2705\u270A\u270B\u2728\u274C\u274E\u2753-\u2755\u2757\u2795-\u2797\u27B0\u27BF\u2B1B\u2B1C\u2B50\u2B55]|\uD83C[\uDC04\uDCCF\uDD8E\u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return string.replace(regex, '')
}
Text Input
render() {
return(
<TextInput
onChangeText={(text) => this.setState({text})}
value={removeEmojis(this.state.text)}
/>
)
}
You can try with the keyboardType="ascii-capable" in the TextIput, in order to hide the emojis option on the keyboard, like:
<TextInput keyboardType="ascii-capable" ... />
Let me know if this works for you.
TextInput has a keyboardType property that will let you fix this issue. But android and ios handle it differently. This is what worked for me with both platforms.
<TextInput keyboardType={Platform.OS === 'android' ? 'email-address' : 'ascii-capable'} ... />
and of course sorry if the question is somewhat dumb.
In the app I'm developing a user should be able to swipe on the TextInput. Since TextInput only listens to taps I used this gist: https://gist.github.com/MikeShi42/87b65984f0a31e38d553cc056fcda017
(BTW #Michael Shi thanks a ton)
However, once I changed TextInput to SlideTextInput the Clear button ceased to work.
clearInput() {
this.setState({text: ''});
}
render() {
return (
<Button name='clear' action={this.clearInput} />
<SlideTextInput
style={styles.input}
ref='input'
onChangeText={(text) => this.setState({text: text})}
placeholder={this.state.placeholder}
value={this.state.text}
multiline={true}
returnKeyType='done'
blurOnSubmit={true} />
)
}
I also tried this.refs.input.setNativeProps({text: ''}); instead of just passing a new value prop (that should be — and was — sufficient for normal TextInput), and calling forceUpdate(), but again to no avail. I don't see much changes in SlideTextInput.js compared to the original TextInput component, but I must be missing something that would explain such bad behaviour?
UPD: the answer was pretty simple in the end. Instead of linking the component to its native counterpart (ref={this._setNativeRef}) like original TextInput does, SlideTextInput has it ref'ed to a string (ref="input"). I changed it back and voila.
Looking at the code it seems that the value props is not being sent to the original TextInput. It is extending the TextInput but it is returning another component without sending the value prop.
Try:
this.refs.input.setText('');
The answer was pretty simple in the end. Instead of linking the component to its native counterpart (ref={this._setNativeRef}) like original TextInput does, SlideTextInput has it ref'ed to a string (ref="input") (it's not about props in my code it's about SlideTextInput.js file itself). I changed it back and voila.