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SPFX Read operation using React framework - Show all the list items

First we are creating context from WebPartContext in props ts file.

import { WebPartContext } from "@microsoft/sp-webpart-base";

export interface INewCrudWithReactProps {
  description: string;
  context:WebPartContext;
  siteUrl:string;
}
Then go to main .ts file, supply values to context and siteUrl
public render(): void {
    const element: React.ReactElement<INewCrudWithReactProps> = React.createElement(
      NewCrudWithReact,
      {
        description: this.properties.description,
        context:this.context,
        siteUrl:this.context.pageContext.web.absoluteUrl
      }
    );

    ReactDom.render(element, this.domElement);
  }

Create ISoftwareCatalog ts file.

export interface ISoftwareCatalog{
    Id:number;
    Title:string;
    SoftwareName: string;
    SoftwareVendor: string;
    SoftwareVersion: string;
    SoftwareDescription: string;
}

Now Create ISoftwareCatalogState.ts file.

import { ISoftwareCatalog } from "./ISoftwareCatalog";

export interface ISoftwareCatalogState{
    status: string;
    SoftwareCatalogItems: ISoftwareCatalog[];
    SoftwareCatalogItem: ISoftwareCatalog;
}

In tsx file:
import * as React from 'react';
import styles from './NewCrudWithReact.module.scss';
import { INewCrudWithReactProps } from './INewCrudWithReactProps';
import { escape } from '@microsoft/sp-lodash-subset';
import { ISoftwareCatalogState } from './ISoftwareCatalogState';

import { ISPHttpClientOptions, SPHttpClient, SPHttpClientResponse } from '@microsoft/sp-http';
import { TextField, PrimaryButton, DetailsList, DetailsListLayoutMode, CheckboxVisibility, SelectionMode, Dropdown, IDropdown, IDropdownOption, ITextFieldStyles, IDropdownStyles, DetailsRowCheck, Selection } from 'office-ui-fabric-react';
import { ISoftwareCatalog } from './ISoftwareCatalog';

//configure columns for the details list component
let _softwareCatalogColumns = [
  {
    key: 'ID',
    name: 'ID',
    fieldName: 'ID',
    minWidth: 50,
    maxWidth: 100,
    isResizable: true
  },
  {
    key: 'Title',
    name: 'Title',
    fieldName: 'Title',
    minWidth: 50,
    maxWidth: 100,
    isResizable: true
  },
  {
    key: 'SoftwareName',
    name: 'SoftwareName',
    fieldName: 'SoftwareName',
    minWidth: 50,
    maxWidth: 100,
    isResizable: true
  },
  {
    key: 'SoftwareVendor',
    name: 'SoftwareVendor',
    fieldName: 'SoftwareVendor',
    minWidth: 50,
    maxWidth: 100,
    isResizable: true
  },
  {
    key: 'SoftwareVersion',
    name: 'SoftwareVersion',
    fieldName: 'SoftwareVersion',
    minWidth: 50,
    maxWidth: 100,
    isResizable: true
  },
  {
    key: 'SoftwareDescription',
    name: 'SoftwareDescription',
    fieldName: 'SoftwareDescription',
    minWidth: 50,
    maxWidth: 100,
    isResizable: true
  }
];

//local constants for styles
const textFieldStyles: Partial<ITextFieldStyles> = { fieldGroup: { width: 300 } };
const narrowTextFields: Partial<ITextFieldStyles> = { fieldGroup: { width: 300 } };
const narrowDropdownStyles: Partial<IDropdownStyles> = { dropdown: { width: 300 } };

export default class NewCrudWithReact extends React.Component<INewCrudWithReactProps, ISoftwareCatalogState> {
 
  //for selection of item, this function calls
  private _selection: Selection;
  private _onItemsSelectionChanged = () =>{
    this.setState({
      SoftwareCatalogItem:(this._selection.getSelection()[0] as ISoftwareCatalog)
    });
  }

  constructor(props:INewCrudWithReactProps,state:ISoftwareCatalogState){
      super(props);
      this.state={
        status: 'Ready',
        SoftwareCatalogItems:[],
        SoftwareCatalogItem:{
          Id:0,
          Title:"",
          SoftwareName: "",
          SoftwareVendor: "",
          SoftwareVersion: "",
          SoftwareDescription:"",
        }
      };

      //for selection item
      this._selection = new Selection({
        onSelectionChanged:this._onItemsSelectionChanged,
      });

  }
 
  private _getListItems():Promise<ISoftwareCatalog[]>{
    const url:string = this.props.siteUrl+"/_api/web/lists/getbytitle('SoftwareCatalog')/items";
    return this.props.context.spHttpClient.get(url,SPHttpClient.configurations.v1)
    .then(response =>{
      return response.json();
    })
    .then(json=>{
      return json.value;
    }) as Promise<ISoftwareCatalog[]>;
  }
 
  public bindDetailsList(message:string):void{
    this._getListItems().then(listItems=>{
      this.setState({
        SoftwareCatalogItems:listItems,
        status:message
      });
    });
  }

  public componentDidMount():void{
    this.bindDetailsList("All records have been loaded successfully");
  }

  public render(): React.ReactElement<INewCrudWithReactProps> {
    const dropdownRef = React.createRef<IDropdown>();

    return (
      <div className={styles.newCrudWithReact}>
        <TextField
          label="ID"
          required={false}
          value={(this.state.SoftwareCatalogItem.Id).toString()}
          styles={textFieldStyles}
          //onChange={this._onSearchForChanged.bind(this)}
         
        />
        <TextField
          label="Software Title"
          required={false}
          value={(this.state.SoftwareCatalogItem.Title).toString()}
          styles={textFieldStyles}
          //onChange={this._onSearchForChanged.bind(this)}
        />
        <TextField
          label="Software Name"
          required={false}
          value={(this.state.SoftwareCatalogItem.SoftwareName).toString()}
          styles={textFieldStyles}
          //onChange={this._onSearchForChanged.bind(this)}
        />
        <TextField
          label="Software Description"
          required={false}
          value={(this.state.SoftwareCatalogItem.SoftwareDescription).toString()}
          styles={textFieldStyles}
          //onChange={this._onSearchForChanged.bind(this)}
        />
        <TextField
          label="Software Version"
          required={false}
          value={(this.state.SoftwareCatalogItem.SoftwareVersion).toString()}
          styles={textFieldStyles}
          //onChange={this._onSearchForChanged.bind(this)}
        />
        <Dropdown
          componentRef={dropdownRef}
          placeholder="select an option"
          label="Software Vendor"
          options={[
            { key: 'Microsoft', text: 'Microsoft' },
            { key: 'Sun', text: 'Sun' },
            { key: 'Oracle', text: 'Oracle' },
            { key: 'Google', text: 'Google' },
            { key: 'IBM', text: 'IBM' }
          ]}
          defaultSelectedKey={this.state.SoftwareCatalogItem.SoftwareVendor}
          required
          styles={narrowDropdownStyles}
          //onChange={this._onSearchForChanged.bind(this)}
        />


        <p className={styles.title}>

          {/* <PrimaryButton
            text='Add'
            title='Add'
            onClick={this.btnAdd_click}
          /> */}
          <div id="divStatus">
            {this.state.status}
          </div>

          <div>
            <DetailsList
              items={this.state.SoftwareCatalogItems}
              columns={_softwareCatalogColumns}
              setKey='Id'
              checkboxVisibility={CheckboxVisibility.always}
              selectionMode={SelectionMode.single}
              layoutMode={DetailsListLayoutMode.fixedColumns}
              compact={true}
              selection={this._selection}

            />
          </div>
        </p>
      </div>
    );
  }
}


Refer: CRUDWithReact webpart under spfx folder.




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