I'm trying to make a dropdown select box. I'm using react-native's Picker.
I'm using the following code:
<Picker mode={"dropdown"} selectedValue={"test2"} style={{height: 50, width: 125}}>
<Picker.Item label="test" value="test"/>
<Picker.Item label="test2" value="test2"/>
<Picker.Item label="test3" value="test3"/>
<Picker.Item label="test4" value="test4"/>
</Picker>
The Picker still appears to not be a dropdown.
I'm using a IPhone X on the simulator.
The mode props is only supported on Android. From the docs:
mode
On Android, specifies how to display the selection items when the user taps on the picker:
'dialog': Show a modal dialog. This is the default.
'dropdown': Shows a dropdown anchored to the picker view
https://facebook.github.io/react-native/docs/picker#mode
I found out that mode only applies to Android. https://www.npmjs.com/package/react-native-picker-select did the job.
I have a bunch of text inputs:
<View style={styles.container}>
<View style={styles.textBoxContainer}>
<TextBoxMA
style={styles.textBox}
placeholder={Labels.USERNAME_PLACEHOLDER}
value={userName}
onChangeText={this.handleTextChange("userName")}
/>
</View>
<View style={styles.textBoxContainer}>
<TextBoxMA
style={styles.textBox}
placeholder={Labels.EMAIL_PLACEHOLDER}
value={email}
onChangeText={this.handleTextChange("email")}
/>
</View>
//here I need to put a Picker, or select element in html terms
</View>
Now, if I put a Picker like this:
<View
style={styles.textBoxContainer}>
<Picker
selectedValue={documentType}
onValueChange={this.handleDocumentTypeChange}
>
<Picker.Item label="ID" value="1" />
<Picker.Item label="Passport" value="212" />
</Picker>
</View>
I get a nice, clean picker in Android. But in iOS I get a picker whose items overlap with the rest of the text boxes and it takes a lot of space. So it destroys all the layout.
I understand that native components corresponding to a dropdown list in the two platforms are different. But how do you handle this?
I've taken a look at AirBnB's app which's been written in React native. In iOS, the view containing the picker slides from the bottom when a corresponding field is clicked (like the Gender field. It looks like a text input but it's not. It just causes the picker to show). And in Android, it's just a modal view with items in the radio button form. They've probably done lots of extra work to achieve that.
Do I need to show picker depending on the platform or is there a built in way to achieve this?
You can use community solutions like
react-native-picker-select
Or
react-native-picker-modal-view
Or
react-native-picker
Or you can build your own solution and do what ever you want you can style and position and even animate your component as you like.
I'm currently developing an app using react native and I'm using react-navigation to navigate between screens, using buttons in my header (back arrow for example).
It's working well, however even if my icon is the right size it seems like the click area is really narrow and I struggle with it.
Do you know how I could define a click zone on my button for it to be clicked easier? I've tried the hitslop prop but it's not working for me (maybe it's been deprecated?).
Here is my button:
var backArrow =
<TouchableOpacity onPress={() => this.props.navigation.goBack()}>
<Ionicons name="ios-arrow-back" size={22} color="#ff8c00" />
</TouchableOpacity>
I'm using Expo and testing on an iPhone 6s Plus.
Wrapping the Ionicons in a TouchableOpacity will only provide a clickable area as large as the Ionicons component. You can increase the size of the clickable area with the following structure:
<TouchableOpacity>
<View>
<Ionicons />
</View>
</TouchableOpacity>
by styling the View to be as large as you require it.
Hi I want to set a custom font I downloaded to the react-native Picker component.
Any idea or solution how to achieve this?
React Native currently doesn't support much styling for Picker component. You can use the itemStyle prop for styling the items on IOS, but it's not supported on Android yet. You can also change the color of the items with the color prop.
<Picker
itemStyle={ style.items } // works only on IOS
selectedValue={this.state.language}
onValueChange={(itemValue, itemIndex) => this.setState({language: itemValue})}>
<Picker.Item color='#000' label="something" value="something" />
<Picker.Item color='#000' label="something" value="something" />
</Picker>
I'm trying to add some styling to react-native picker, like underlying and set placeholder, but unable to do so.
const styles = StyleSheet.create({
picker: {
textDecorationLine: 'underline'
}
});
<Picker
style={[styles.picker]}>
<Picker.Item label="Country" value="" />
<Picker.Item label="United States" value="US" />
<Picker.Item label="India" value="IN" />
</Picker>
If i use value="", then it shows country as a selectable value, which i don't want.
textDecorationLine is not able to set the underline styling to picker.
Basically, i am looking to create something like this,
where, i can set the color of placeholder as well.
Thanks in adv.
Picker and Picker item's styling is handled natively on Android. You need to define style for Android's SpinnerItem in android/app/src/res/styles.xml see: How to style the standard react-native android picker?
I tried to test the underline but couldn't seem to find anything that worked. Here is couple of workarounds Android spinner with underline appcompat
However, I would simply use react native's components to our advantage. I'd create a new component that wraps React Native's Picker and put the picker in a View with the underline style that renders a placeholder if the Picker's value is undefined.
You can also use this one for make more attractive to your react-native picker.You can add styles to your view so it can easily make changes to your picker.
import React, { Component } from 'react';
import { View, Picker } from 'react-native';
export default class DropdownDemo extends Component{
state = { user: '' }
updateUser = (user) => {
this.setState({ user: user })
}
render(){
return(
<View
style={{
width: 300,
marginTop: 15,
marginLeft:20,
marginRight:20,
borderColor: 'black',
borderBottomWidth:1,
borderRadius: 10,
alignSelf: 'center'
}}>
<Picker
selectedValue={this.state.user}
onValueChange={this.updateUser}
>
<Picker.Item label="Male" value="Male" />
<Picker.Item label="Female" value="Female" />
<Picker.Item label="Other" value="Other" />
</Picker>
</View>
);
}
}
You need to modify your activity theme as follows:
<!-- Base application theme. -->
<style name="AppTheme">
<!-- Customize your theme here. -->
<item name="colorAccent">#color/colorAccent</item>
<item name="android:spinnerStyle">#style/Base.Widget.AppCompat.Spinner.Underlined</item>
...
</style>
The colorAccent controls the color of the underline, and using #style/Base.Widget.AppCompat.Spinner.Underline provides the underline on your Picker.
You can use this technique to set the styling on almost any android component in React. android:editTextStyle, android:textViewStyle, etc.
Unfortunately, because the React Picker extends Spinner and not AppCompatSpinner, the styling will be a bit different if you're running on API < 21.
The issue here is an assumption that Picker has the properties and styling of TextInput, which it does not. There's a related question here: Have a placeholder for react native picker where a comment outlines what you'll need to render something akin to placeholder text.
In order to achieve something like to textDecorationLine you might apply a borderBottomWidth style to the component.
Also, remember to bind the selectedValue and onValueChange props:
selectedValue={this.state.country} onValueChange={(country) => this.setState({country: country})}>
This is the closest I can get on iOS: https://snack.expo.io/r1L7DGb1Z
Few things to note:
1) there is itemStyle property for setting the specific style for single picker item
2) In order to get down arrow, you have to mimic it manually. You would probably like to attach it's functionality with TouchableHighlight (which isn't done in the example)
3) This doesn't look similar in the Android, so you probably need to append additional, platform specific styling.
This piece of the code is working on my machine:
<View style={{borderBottomWidth:1, borderColor: 'rgb(204, 204,
204)',width: "28%"}}>
<Picker
selectedValue={this.state.pickerValue}
style={[styles.textInputBox]}
onValueChange={this.onChange}>
<Picker.Item label="+31" value="+31" />
<Picker.Item label="+41" value="+41" />
<Picker.Item label="+51" value="+51" />
<Picker.Item label="+61" value="+61" />
</Picker>
</View>