How to Create a Child in a Tree View Using Ext.js

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Understanding the Basics

Before diving into the code solution, let’s clarify some important terms:

TreeStore: This component is used to store and manage the data that will be displayed in the tree. It defines the structure of your tree and allows you to organize your data efficiently.

TreePanel: This is the visual component that displays the tree to the user. It enables interaction with the hierarchical data.

Step-by-Step Solution

Now, let’s create a child in a tree view step by step. Here’s how to do it in Ext JS 7.3.0, although the concepts are applicable to other versions with minor adjustments.

1. Define the TreeStore

First, you need to define a TreeStore. This will hold your tree data structure. Here's an example of how you can set it up:

[[See Video to Reveal this Text or Code Snippet]]

2. Launch the Application

Next, you will need to create an instance of your application that launches the TreePanel with the TreeStore you just defined.

Here is how you can do that:

[[See Video to Reveal this Text or Code Snippet]]

Important Note on Leaf Nodes

In the data structure defined in TreeStore, nodes may either be leaf nodes or have children. Leaf nodes represent the end points of the tree, while other nodes can have child nodes defined under them.

3. Enjoy your Tree View!

Now that you have defined both the TreeStore and the TreePanel, you can run your application and see the tree view rendered on the screen. You should be able to see nodes and sub-nodes structured as specified in your data.

Conclusion