Sometimes you may have seen reactjs form component code where a separate state variable is assigned to separate form fields and a separate onChange handler for each form field. There is no harm in this method, but it creates some extra code in your file which could create a future problem in managing the project.
In the Mobile app, we need to navigate between different screens, and each platform has its way of implementation. But in react native, we use the same code base for building a mobile app for all platforms.
Fortunately, you don't need to write the platform-specific code for creating navigation; it has already been done by someone. We have react-navigation library, which creates navigation for us and handles underlying platform complexities.
Here is a simple example.
Detail Component
In ReactJS, if you want to share the data between two or more components, you need to keep that data to their component which is parent component and then you pass that data in the form of properties. If you want to share the same data to further down components, you need to do the same.
Its method is to manage state or data which can be shared among multiple components.
You can pass this data to components without using Props.
Normally, state of ReactJS component may have many state properties/constants/variables to hold values after something is done. If state object has one value, than is very easy to update this value using setXXX function. But if the state has Array type values, than you need to merge the values. To merge the values, you need to pull previous values, extract them and create new array using the old values and new value. Then set the new update array back to state.
In reactjs, Using forwardRef , you can forward reference of current react component to the component which would use this. And that component can store the returned reference to its local variable and then can access functions or properties of the component(which forwarded reference).
ReactJS element are immutable, it means you don’t have any way to update any part of these element. You need to render the entire element again if you want to update any part of it. But, in reality, the entire DOM is not updated in browser and reactjs just update the part of actual DOM.
ReactJS example to show how it is safe to use JSX.
Create any react app as usual you do. There is nothing special you need to configure to use the react app code in existing website.
This file would contain some configuration values that will be used by build tool.
This configuration would allow to create separate packaged code of entire react app at one place.
Rendering Collection of objects stored in state.
In ReactJS, each component has two aspects: one is view and second is content or data. View part is defined by using JSX or HTML component and data is stored in variables. To hold the data inside a component, you have three options.
