Revise the React component for a more concise solution

In my code, I am utilizing a REACTJS Office UI Component known as details list available at this link. The goal is to make my application capable of rendering information from any type of SharePoint List regardless of the columns it contains. To achieve this, I am implementing a factory method design pattern as shown below:

/* Code for defining interfaces for different list items */
// Import statements

/* Code for defining factory interface and implementation */
// Import statements

export class ListItemFactory implements IFactory{   
    getItems(requester: SPHttpClient, siteUrl: string, listName: string): IListItem[] {
        // Switch statement to handle different list types
    }
} 
/* Public function for getting list items */

The state class is defined as follows:

/* State interfaces for different list item types */

/* Component state initialization */
// Constructor and componentWillReceiveProps functions

/* Render function to display DetailsList based on list name */
// Switch statement for rendering appropriate DetailsList based on list name

Areas of improvement identified in the code:

  1. Is there an alternative way to refactor the switch statement for improved readability?

  2. Are there better ways to manage the component's state rather than the current implementation?

Update 1: After making changes based on suggestions, errors were encountered:

Error 1 - In ListMarqueeSelection component:

Issue with assigning types in the ListMarqueeSelection component.

Error 2 - In render function:

Problem with recognizing 'ListMarqueeSelection' component.

'ListMarqueeSelection' component not found. Did you mean 'this.ListMarqueeSelection'?

Answer №1

It's true that the code is quite lengthy due to poor organization, but we can easily enhance it.

Firstly, we notice that the setState calls in the readItems method are repetitive, except for the specific *ListItemState used. We should refactor this by creating a function to handle these calls and eliminate the redundancy.

We can refactor the readItems method as follows:

  private readItems() {
    this.setState({
      status: 'Loading all items...'
    });
    
    if (this.props.listName) {
      this.setStateWithList();
    }   
  }

Next, let's simplify the rendering logic by introducing parameterization to avoid repetition:

  render() {
    switch(this.props.listName)
    {
        case "List":
          return <this.ListMarqueeSelection
            itemState={this.state.DetailsListItemState}/>;
        case "News":
          return <this.ListMarqueeSelection
            itemState={this.state.DetailsNewsListItemState}/>;
        case "Announcements":
          return (<this.ListMarqueeSelection
            itemState={this.state.DetailsAnnouncementsListItemState}/>;
        case "Directory":
          return <this.ListMarqueeSelection
            itemState={this.state.DetailsDirectoryListItemState}/>;
        default:
          return undefined;
    }
  }

Lastly, we can clean up duplicate logic between the constructor and componentWillReceiveProps methods by extracting a shared function:

This leads us to a more concise and efficient implementation of the FactoryMethod component.

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