enter image description here
https://i.stack.imgur.com/AEGy7.png
I have a TextInput component how can I write content and it suggests the next word that is highlighted as the image
when i enter F and it automatically adds b.com is blacked out
You can have a list with common keywords that you use in your app, something like this:
[
{
"id": 1,
"name": "chicken",
}
{
"id": 2,
"name": "banana",
}
]
Note that ideally you would be getting this data from an API and not manually add it yourself.
Then, make a simple search bar and declare a new variable using useState:
const [filter, setFilter] = useState([])
...
<TextInput style={styles.textinput} placeholder='Search food...' onChangeText={handleChange}/>
The handleChange function is in charge of setting the new data Filter:
const handleChange = (e) => {
const currentFilter = data.filter((item) => {
return item.name.toLowerCase().includes(e.toLowerCase())
})
setFilter(currentFilter)
}
For displaying the data that you want, you can use conditional rendering. Just insert the following snippet inside the View in which you want to display your data:
{
filter.length != 0 && (
<View>
{
filter.map((item, key) => {
return <Text key={item.id} style={styles.textstyle}>{item.name}</Text>
})
}
</View>
)
}
Here is the full code:
export default function FilteringTest() {
const [filter, setFilter] = useState([])
const handleChange = (e) => {
const currentFilter = data.filter((item) => {
return item.name.toLowerCase().includes(e.toLowerCase())
})
setFilter(currentFilter)
}
return (
<View style={styles.background}>
<TextInput style={styles.textinput} placeholder='Search food...' onChangeText={handleChange} />
{
filter.length != 0 && (
<View>
{
filter.map((item, key) => {
return <Text key={item.id} style={styles.textstyle}>{item.name}</Text>
})
}
</View>
)
}
</View>
)
}
As for highlighting the values, you can simply create a new Text on top of the searchBar that contains the closest match. I suggest you read this article on filtering data in react native: https://www.freecodecamp.org/news/how-to-make-a-filter-component-in-react/
TextInput for IOS - https://snack.expo.dev/JrWw1Zj5Z
TextInput for android - https://snack.expo.dev/piRXBQv6aM
For better view you can disable borders on TextInput or make TextInput transparent, and set borders and other styles to Text component
Related
I am developing react-native project.
I have a function which set icon metadata into a Map :
export function getIconsMetadata() {
// a map of icons' metadata
const iconsMetadata = new Map();
...
// code to set icon metadata to the map
iconsMetadata.set("foo", "Foo");
iconsMetadata.set("bar", "Bar");
...
return iconsMetadata;
}
There is another function which returns the actual icon component based on the icon type (i.e. the value of iconsMetadata holds the icon type):
export function getMyIcon(iconType) {
switch (iconType) {
case 'Foo':
return <Foo />;
case 'Bar':
return <Bar />;
...
}
In my screen, I have a function to show icon component by iterating over the values of the above icons' metadata Map, and try to render each icon component:
export const MyScreen() => {
const showIcons = () => {
[...getIconsMetadata().values()].map((iconType, index) => {
const iconComponent = getMyIcon(iconType);
return <View key={index}>
{iconComponent}
</View>;
});
};
return (
<View style={styles.container}>
{/*I call the showIcons function here to render icons*/}
{showIcons()}
</View>
)
}
Problem is the icons are not shown on screen.
But if I directly return one icon component in my screen:
export const MyScreen = () => {
...
const showOneIcon = () => {
return <View>
<Foo />
</View>;
});
}
return (
<View style={styles.container}>
{/*I show one icon*/}
{showOneIcon()}
</View>
)
}
The <Foo /> icon component is rendered successfully on the screen.
So, why iterating the map to show all icons don't work?
The problem is that you’re not returning anything from showIcons. Either you remove { } from there
const showIcons = () =>
[...getIconsMetadata().values()].map((iconType, index) => {
const iconComponent = getMyIcon(iconType);
return <View key={index}>{iconComponent}</View>;
});
or add return before [...getIconsMetadata().values()].map
const showIcons = () => {
return [...getIconsMetadata().values()].map((iconType, index) => {
const iconComponent = getMyIcon(iconType);
return <View key={index}>{iconComponent}</View>;
});
};
I'm new in RN. When I want to navigate between screens I create this function:
displayScreen2 = () => {
this.props.navigation.navigate("screen2")
}
and I call it in onPress={this.displayScreen2}
with TouchableOpacity or any Touchable when the user clicks he has to wait 1 second or 2 before displaying the screen. So what I want is to change the Touchable icon to an loader.
It's simple if I use a conditional rendering but I don't know how to do it now, when I have to change my state? Any suggestions?
this is my approach:
<TouchableOpacity
style={Styles.topButton}
onPress= {() => {
this.setState({loading: 'load'},
() => {
displayScoreListView()
// this.setState({loading: 'icone'})
}
)
}}
>
<Text style={Styles.scoreListButtonTextRed}>{this.state.loading}</Text>
that not work, tha state change but visualy not because if I return to the first screen I have 'load' in the text component
You could create a custom component wrapping whatever Touchable you prefer, I've used this technique in my production apps before. The button has it's own state which allows you to automatically display a loading indicator when necessary.
export class ButtonWorker extends Component {
state = {
working: false
}
onButtonPress = () => {
this.setState(
{ working: true },
() => {
this.props.onPress(this.onWorkFinished);
}
);
}
onWorkFinished = () => {
this.setState({ working: false });
}
render() {
return (
<TouchableOpacity>
{this.state.working ? (
<ActivityIndicator />
) : (
this.props.children
)}
</TouchableOpacity>
);
}
}
And then use it like a normal button with additional logic!
export class NavigationScreen extends Component {
navigate = (done) => {
// ... Asynchronous logic goes here
done();
this.props.navigation.navigate("Screen2");
}
render() {
return (
<Fragment>
{/* ... */}
<ButtonWorker onPress={this.navigate} />
</Frament>
);
}
}
When migrating from ListView to Flatlist I am getting values in an object I need to get as a value in array.
I have modified the react-native-modal-filter-picker to a custom component which needs to work for me. Here onSelect shows the results in object.
renderOptionList = () => {
const {
noResultsText,
listViewProps,
keyboardShouldPersistTaps,
keyExtractor,
} = this.props
const { ds } = this.state;
if (!ds.length) {
return (
<FlatList
data={ds}
keyExtractor={keyExtractor||this.keyExtractor}
{...listViewProps}
renderItem={() => (
<View style={styles.noResults}>
<Text style={styles.noResultsText}>{noResultsText}</Text>
</View>
)}
/>
)
} else {
return (
<FlatList
keyExtractor={keyExtractor||this.keyExtractor}
{...listViewProps}
data={ds}
renderItem={this.renderOption}
/>
)
}
};
renderOption = ({item}) => {
const {
selectedOption,
renderOption,
optionTextStyle,
selectedOptionTextStyle
} = this.props;
const { key, label } = item
let style = styles.optionStyle;
let textStyle = optionTextStyle||styles.optionTextStyle;
if (key === selectedOption) {
style = styles.selectedOptionStyle;
textStyle = selectedOptionTextStyle ||styles.selectedOptionTextStyle
}
if (renderOption) {
return renderOption(item, key === selectedOption)
} else {
return (
<TouchableOpacity activeOpacity={0.7}
style={style}
onPress={() => this.props.onSelect(item)}
>
<Text style={textStyle}>{label}</Text>
</TouchableOpacity>
)
}
};
const object1 = {
a: 'somestring',
b: 42,
c: false
};
console.log(Object.values(object1));
Output will be
["somestring", 42, false]
Try this...
JSON.stringfy(object)
A common use of JSON is to exchange data to/from a web server.
JSON.stringfy convert a JavaScript object into a string.
I've made a custom Radio Button in React Native. Below is the link to my code.
https://gist.github.com/shubh007-dev/0d8a0ca4d6f7d1530f3e28d223f9199e
What I want is to animate the radio button when I press it, like it's done in this library - https://www.npmjs.com/package/react-native-simple-radio-button
I'm able to animate my radio button for the first time but when I press another radio button, animation doesn't happen.
(Another approach for this question) How can I make sure that the Animated value is different for each Radio Button?
You either have to make a custom component for the radio or use x animated variable for x radio buttons.
Now, making x variable for x buttons is not an efficient solution but it could be used if you got only a few buttons.
You made a custom component which renders a flatlist and that's the problem; can't animate buttons separately in the same component you use to render them.
You should split your code and make the radio button a component itself.
Something like that (didn't test it, but that way it should work) :
export class RadioButton extends Component {
constructor(props) {
super(props);
this.state = {
radioSelected: this.props.selectedItemId,
};
}
radioClick = id => {
this.setState({ radioSelected: id });
this.props.onChange(id);
}
renderRadioButton = item => {
const { radioSelected } = this.state;
const { labelLeftStyle, labelRightStyle, labelOnRight } = this.props;
return (
<AnimatedRadio
{...item}
isSelected={item.id === radioSelected}
labelLeftStyle={labelLeftStyle}
labelRightStyle={labelRightStyle}
labelOnRight={labelOnRight}
radioClick={this.radioClick}
/>
);
};
render() {
return (
<FlatList
data={this.props.radioOptions}
extraData={this.state}
renderItem={({ item }) => this.renderRadioButton(item)}
keyExtractor={(item, index) => index.toString()}
/>
);
}
}
export class AnimatedRadio extends Component {
springValue = new Animated.Value(1.1);
onRadioClick = id => () => {
const { radioClick } = this.props;
radioClick(id);
this.spring();
};
spring = () => {
Animated.spring(this.springValue, {
toValue: 0.95,
friction: 2,
tension: 15,
}).start();
};
render() {
const {
id,
label,
labelLeftStyle,
labelRightStyle,
labelOnRight,
isSelected,
} = this.props;
return (
<View key={id} style={STYLES.radioContainerView}>
<TouchableOpacity
style={STYLES.radioButtonDirectionStyle}
onPress={this.onRadioClick(id)}
>
{labelOnLeft == true ? (
<Text style={[labelLeftStyle]}>{label}</Text>
) : null}
<View
style={[isSelected ? STYLES.selectedView : STYLES.unselectedView]}
>
{isSelected ? (
<Animated.View
style={[
STYLES.radioSelected,
{ transform: [{ scale: this.springValue }] },
]}
/>
) : null}
</View>
{labelOnRight == true ? (
<Text style={[labelRightStyle]}>{label}</Text>
) : null}
</TouchableOpacity>
</View>
);
}
}
This way each component radio will have its own animated value, and won't interfere with others buttons.
I did it using LayoutAnimation like below.
LayoutAnimation.configureNext({
duration: 300,
create: {
type: 'linear',
property: 'scaleXY',
},
update: {
type: 'spring',
springDamping: 0.4,
property: 'opacity',
},
delete: {
type: 'easeOut',
property: 'opacity',
},
});
I want to select only one checkbox, not multiple.
If i select two checkboxes one by one the previously selected checkbox should be unselected.
In my below code i can select multiple checkboxes.
import React ,{Component} from "react";
import CircleCheckBox, {LABEL_POSITION} from "react-native-circle-checkbox";
class Select_Delivery_Option extends React.Component {
constructor(props) {
super(props);
const ds = new ListView.DataSource({
rowHasChanged: (row1, row2) => row1 !== row2
});
this.state = {
check_data:[],
dataSource: ds.cloneWithRows([]),
checked:false,
isLoading:false,
};
}
//I had call The componentDidMount for json Data here and bind it in Data source;
render() {
return ();
}
_renderRow(rowData: string, sectionID: number, rowID: number) {
return (
<View style={{ flex:1,flexDirection:'column',backgroundColor:'#FFF'}}>
<View style={{ flex:1,flexDirection:'row',backgroundColor:'#FFF'}}>
<View style={{flexDirection:'column',margin:10}}>
{rowData.adbHomeAddress}
<CircleCheckBox
checked={rowData.checked}
onToggle={()=>this._onPressRow(rowID, rowData,rowData.checked)}
labelPosition={LABEL_POSITION.LEFT}
label={rowData.Address1 +" ,\n "+ rowData.Address2 +",\n"+rowData.ctiName+", "+rowData.staName+", "+rowData.ctrName+","+rowData.adbZip+"."}
innerColor="#C72128"
outerColor="#C72128"
styleLabel={{color:'#000',marginLeft:10}}
/>
</View>
</View>
</View>
);
}
_onPressRow = (rowID,rowData,checked) => {
const {check_data,filter} = this.state;
console.log('rowdata',rowData);
console.log('rowid',rowID);
console.log('checked',checked);
rowData.checked = !rowData.checked;
var dataClone = this.state.check_data;
dataClone[rowID] = rowData;
this.setState({check_data: dataClone });
}
}
Link to the CircleCheckBox component used: https://github.com/paramoshkinandrew/ReactNativeCircleCheckbox
I had the same requirement and wasted hours looking for solution. Eventually, I was able to resolve the problem on my own.
Posting my answer below, l have used hooks in the example, let me know if someone wants a class-based solution.
const checkboxComponent = () => {
const [checkboxValue, setCheckboxValue] = React.useState([
{ label: 'Customer', value: 'customer', checked: false },
{ label: 'Merchant', value: 'merchant', checked: false },
{ label: 'None', value: 'none', checked: false },
])
const checkboxHandler = (value, index) => {
const newValue = checkboxValue.map((checkbox, i) => {
if (i !== index)
return {
...checkbox,
checked: false,
}
if (i === index) {
const item = {
...checkbox,
checked: !checkbox.checked,
}
return item
}
return checkbox
})
setCheckboxValue(newValue)
}
return (
<View>
{checkboxValue.map((checkbox, i) => (
<View style={styles.checkboxContainer} key={i}>
<CheckBox
value={checkbox.checked}
onValueChange={(value) => checkboxHandler(value, i)}
/>
<Text style={styles.label}>{checkbox.label}</Text>
</View>
))}
</View>
)
}
export default checkboxComponent
I suggest you to use FlatList instead of ListView it's more advance and easy to use component.
For your issue please create a state checkedItem: -1 and directly assign id of your item you check last then just add a check to your CircleCheckBox item. something like below code.
<CircleCheckBox
checked={rowData.id === this.state.checkedItem}
onToggle={(rowID)=> this.setState({ checkedItem: rowID})}
labelPosition={LABEL_POSITION.LEFT}
label={rowData.Address1 +" ,\n "+ rowData.Address2 +",\n"+rowData.ctiName+", "+rowData.staName+", "+rowData.ctrName+","+rowData.adbZip+"."}
innerColor="#C72128"
outerColor="#C72128"
styleLabel={{color:'#000',marginLeft:10}}
/>
Let me know if any query.