React dynamic tree

Recently, I published a react component to npm that renders a file tree React component in a native Electron application.

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It was a fun project, and pretty comprehensive, covering basic computer science techniques through advanced front-end frameworks, so I thought it would be a good topic to share. Also, in examples, I have left out import statements to keep things simple. Good question. Why did I make this component?

At the end of the program, students complete a comprehensive capstone project that showcases their skill as developers and usually includes a few new techniques that they picked up to make the project great.

My group and I decided to make a desktop application that would allow developers to pair program together remotely from anywhere. You can find the deployed project here. The app features peer to peer video, command line Git functionality for version control, and a live updating code editor.

Alongside the code editor we wanted a responsive file tree view that would expand and contract when a user entered or closed a directory.

I was responsible for implementing this, and realized it could be useful for others as an importable component. It also showed me a very practical use of recursion, and was a challenge to integrate into React, hence this post. To create a representation of a file tree in JavaScript, the object literal came to mind as a great framework.

So, how do we populate this object? Well, to start things off, we need a root directory, and access to the files and folders inside that directory. How do we get that? The first thing we need to do is get a list of all files and folders. Because this method and most other fs methods are asynchronous, it would be nice if we could get these into a promise for more legible code flow and better error handling.

So, our readdir function becomes fs. How can we tell if a something is a file or a folder? Well, the fs library provides us a method that gives meta data about a file, given a file path. Its the stat method, and one of the bits of data it provides is a boolean, returned from an isFile method invocation. It will return true for a file, and false for a directory. OK, now for the hard part. Remember that folders can have folders inside them, and those folders can have folders inside them, and those folders can haveā€¦.

Recall the definition of recursion:. Recursion in computer science is a method where the solution to a problem depends on solutions to smaller instances of the same problem as opposed to iteration. Concrete Mathematics.Before directly jumping into technical topic just consider a tree.

Imagine it from a structural point of view. Within a branch there could be multiple branches leading to leafs or buds. Compare this with actual information system. The leafs or buds are the information in the form of files and other resources.

Meanwhile, the branches are the path to those resources like multiple folders under which the file reside. How many possible path are there and time consumed to visit the nodes?

To ease this and using the same principle react tree view has been coined.

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A number of react tree library offers simple and effective react tree table view. Treeview is one of the most used web component. You can easily implement react tree view to your project. Although majority of work is done it may come with some limitation. We will see 12 examples of react tree which will cover topics like html5 treeview, react tree table and relevant libraries. Above all they have been designed with intention to improve user navigation experience in the application.

The react treebeard example shown here consist of two sections. The first one contain folders organized in a hierarchy structure. The section on the right shows the details of the item currently on selection. Moreover, we have the option to expand or collapse the parent folder. This allows us the option to either see child folders and files under them or hide them if they are occupying a lot of space. This react tree component is fast, efficient and data drive while also allowing multiple configuration options.

Download from GitHub.

react dynamic tree

This is an easy, light and flexible treeview made with react. The example describes two type of treeview. The first one is uncontrolled where each node are manually opened and closed whereas second one is controlled allowing collapse all button. This button is responsible for closing all nodes currently on expansion.A datagrid enables you to display and edit data.

This is a vital feature in most data-driven applications. You may have implemented this in one of your React apps in the past.

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Maybe you used libraries like react-bootstrap-tablereact-gridor react-table. With those, you can add a Datagrid to your React app. But what if you want the changes to be done in real-time and updates synchronized across all connected devices and their browsers? In this article, I will show you how to build a real-time datagrid in React using react-table and Hamoni Sync.

Hamoni Sync is a real-time state synchronization service which enables you to synchronize your application state in real-time. If you want to follow along, you should have some knowledge of React and have the following tools installed:.

Open the command line and run npx create-react-app realtime-react-datatable.

react dynamic tree

This will bootstrap a React application for us by creating a new directory realtime-react-datatable with the files needed to build a React application. With the React app created, we need to install react-table and Hamoni Sync. Still on the command line, run cd realtime-react-datatable to switch to the directory for the app.

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Run npm i react-table hamoni-sync in the command line to install both packages. To render the datagrid, we will use the react-table component. The code above renders a form and an editable react-table component. Th e data props holds the data to displayand c olumns props for the column definition.

The ac cessor proper ty in c olumns props indicates the property that holds the value to be displayed for that co lumn. Cell: this. The data for the datagrid will be retrieved and updated in real-time using Hamoni Sync. We already imported the Hamoni library on line 18 in App. We need to initialize it and connect to Hamoni server. To do this we need an account and application ID. Follow these steps to create an application in Hamoni.

The code above will connect the client device or browser to Hamoni Sync server. Copy your account and application ID from the dashboard and replace them with the string placeholder respectively. Add the following to the function in the then block, to be executed when it successfully connects to the server:.Component wrappers for auto-scrolling collapsible elements - with smooth animations powered by react-motion and react-collapse.

Universal, semantic and accessible React state managing components for creating Accordions and Tabs. Great way to get started and practice some ES6, however at the end of this brief guide I was left with only one list item, so I had some fun digging around to figure out how to render a full list of question and answers. These are a11y compliant accordions.

Very basic, but a good illustration of how you can implement features rapidly using React. Accordion A collection of 24 posts. Full page or set height fancy React accordion.

Collapse component with CSS transition for elements with variable and dynamic height. Accordion react component with animation.

A very lightweight accordion component in React only has one dependency. Declarative, modular and accessible React tabs component. React accordion component. React Responsive Collapsible Section Component.

React accordion component with customizable flexbox header. The event trigger can be configured to any component, such in the Navigation and Content. Accessible Accordion component for React. Inspired by rc-collapse and react-sanfona. Simple lightweight 1. A Simple React Accordion example. An integration of react-window with react-select to efficiently render large lists.One of them most common tasks that we need to know how to do with React.

Zero or one hundred - it shouldn't matter. You can find the full source code in this GitHub repository. Our application is going to render 5 images dynamically. There is a catch: our application will work equally well for 50 or any other number of images. Let's see how. Application component is a contrainer component - it encapsulates our entire React. Image component on the hand - renders a single image. If you're not sure why we're not calling React. Then we also create some inline styles for our img Node element:.

Our Application component renders some layout elements with Bootstrap class names and then calls this. We're passing data. What is data. The data object comes from importing a JSON file and converting it to a JavaScript object that we reference as data :. So when we're importing data. Effectively images. We know that map function returns a new array that is made of items that createImage function returns. Our createImages function then returns that new array and since we're calling createImages in our component's render function - that new array will be rendered by React.

It takes an image file name as a parameter. Then it creates a new instance of our Image component passing image as value for source and key properties. Remember that our Image component needs to know what image file it should render and source property tells it exactly that.

But what about that key property - we don't use it in our Image component - why are we passing it then?

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The key property is used by React to uniquely idenfity our Image component instances.Refs are a function provided by React to access the DOM element and the React element that you might have created on your own. They are used in cases where we want to change the value of a child component, without making use of props and all.

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They also provide us with good functionality as we can use callbacks with them. Output: In the above example, we are making use of the target value of event e, for getting the value of what Mukul is saying. This above output can also be achieved by using the refs.

Output: In the above we make use of refs provided by React, they can also be used to add callback functions inside them which is helpful in many cases. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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react dynamic tree

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Improved By : ManasChhabra2. Load Comments.The Grid component can show tree data. In the following example, the data is specified as grouped array. In controlled modepass the expanded row ids to the TreeDataState plugin's expandedRowIds property and handle the onExpandedRowIdsChange event to control the tree data state externally. The TableTreeColumn plugin allows showing hierarchical selection controls.

You can also combine the TableTreeColumn plugin with the TableSelection plugin to highlight the selected rows and handle the click event on the entire row. You can handle the Grid's tree data state changes to request nested data from the server according to the expanded row ID.

Practical Recursion: Implementing a File Tree View in React & Electron

Tree data options are updated once an end-user interacts with the UI. Handle option changes using the TreeDataState plugin's onExpandedRowIdsChange event and request data from the server using the applied tree data options.

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Once the page data is received from the server, pass it to the Grid component's rows property. Related Plugins The following plugins implement tree data support: TreeDataState - controls the expanded rows state CustomTreeData - converts custom tree data to a supported format TableTreeColumn - renders the table column with an indent, toggle button, and selection controls Note that the plugin order is important.

Custom Tree Data In the following example, the data is specified as grouped array.