In this article, we are going to create a canvas with a given background color using FabricJS. The default background color provided by the FabricJS API is white and it can be customized using the second argument.Syntaxnew fabric.Canvas(element: HTMLElement|String, { backgroundColor: String }: Object)Parameterselement − This parameter is the element itself which can be derived using document.getElementById() or the id of the element itself. The FabricJS canvas will be initialized on this element.Options − This parameter is an Object which provides additional customizability to our canvas and backgroundColor is one of them which will help us customize the ... Read More

In this article, we are going to create a canvas using FabricJS but before that let us understand what a canvas is. For drawing graphics on a webpage, we have a web API called Canvas API. This API is good for drawing basic shapes but adding interaction to it or drawing complex shapes becomes very difficult. Thus FabricJS comes into the picture which is a library built on top of the Canvas API. To use FabricJS, the first thing that needs to be done is to create a FabricJS Canvas.Syntaxnew fabric.Canvas(element: HTMLElement|String, options: Object)Parameterselement − This parameter is the ... Read More

To display chips in the UI, we are going to make use of React Native Paper Material Design.Install react native paper as shown below −npm install --save-dev react-native-paperThe chip component looks as follows on the UI −The basic chip component is as follows −Chip NameThe basic properties of chip are as follows −PropsDescriptionmodeThe values for mode are flat and outlined. With flat mode you will not get a border and with outlined the border for the chip will be displayed.iconThe icon to be given to the chip.selectedThe values are true/false. If true the chip will be selected.selectedColorColor to be given ... Read More

React Native offers an Animation component that helps to add more interactivity to components available.The animation component can be used to animate View, Text, Image, ScrollView, FlatList and SectionList.React Native provides two types of animation −Animated APILayoutAnimationAnimated APIThe animated api helps to provide time based animation based on the input/output.In this example, we will dynamically change the width and the height of the box using animated timing api.To work with animation, import the component as shown below −import { Animated } from 'react-native'To work with Animation, we need to configure it first as shown below −The Animated.timing() function makes use ... Read More

Checkboxes is a common component that we often use on the UI. We do have some cool ways of showing checkboxes in reactnative.The core react-native package does not have checkbox support and you need to install a package to work with it.Following package has to be installed to display checkbox −npm install --save-dev react-native-paperThe basic checkbox component is as follows −Let us now see some important properties on checkbox −PropsDescriptionstatusThe value that can be given to status are checked, unchecked and indeterminate.disabledThe value is boolean.It can be used to enable/disable the checkbox.onPressThe function that will be called when the checkbox ... Read More

To display date and time picker in your app you have to install a package as shown below −npm install @react-native-community/datetimepicker --saveOnce you are done installing, let us now proceed on how to display a Datepicker first.Example: DateTimePicker in ReactNativeImport the datetimepicker component first as shown below −import DateTimePicker from '@react-native-community/datetimepicker';A basic DateTimePicker component looks as follows −Here are some of the important properties of DateTimePicker.PropsDescriptionmodeDefines the type of picker you want. The options are date, time, datetime and countdown.From above options datetime and countdown are available only on iOS.displayThe values for Android are default, spinner, calendar and clock. For ... Read More

SwitchSelector component is similar to a radio toggle button. It allows you to select with more than 2 values.To work with SwitchSelector you have to install the package as shown below −npm i react-native-switch-selector --save-devThe basic SwitchSelector looks as follows − console.log(`value selected is : ${value}`)} />Here are some important properties of SwitchSelector −PropsDescriptionoptionsAn array with label, value and imageicon id required.initialThe initial item from the array that will be selected.valueThe switch value that will be available with onPress eventonPressThe event with callback function that will get called when the Switch is changed.fontSizeThe fontSize to be considered for the label.selectedColorThe ... Read More

While developing your app you can come across the error as stated above. Here is the code that gives the error −Exampleimport React from "react"; import { Image , Text, View, StyleSheet } from "react-native"; export default class App extends React.Component {    render() {       return (                                       );    } } const styles = StyleSheet.create({    container: {       paddingTop: 50,       paddingLeft: 50,    },    stretch: {       width: ... Read More

Problem: How to handle the error “A navigator can only contain 'Screen' components as its direct children” while working with Navigation in ReactNative?SolutionWhile working on your app you may come across issues like stated above. Here will understand why such error comes up and what can be done to avoid it.Here is the code that gives us the error −ExampleApp.jsimport * as React from 'react'; import { NavigationContainer } from '@react-navigation/native'; import { createStackNavigator } from '@react-navigation/stack'; import { Button, View, Alert, Text } from 'react-native'; const Stack = createStackNavigator(); const HomePage = ({ navigation }) => {    return ... Read More

While working on the app, we would like to switch from one screen to another and that is handled by react navigation.To work on navigating pages we need to install few packages as follows −npm install @react-navigation/native @react-navigation/stack npm install @react-native-community/masked-view react-native-screens react-native-safe-area-context react-native-gesture-handlerOnce you are done with the above installation let us now proceed with the next setup of navigation in react native.In your app project create a folder called pages/ . Create 2 js files HomePage.js and AboutPage.js.pages/HomePage.jsimport * as React from 'react'; import { Button, View, Alert, Text } from 'react-native'; const HomeScreen = ({ navigation }) ... Read More