demo D184

Shadow columns: what changed in Angular

Delta, percent change and a move count against the value at page load

shadow: { of, kind: 'delta' }

This grid adds shadow columns showing each value's delta, percent change and move count against its value at page load. It lets a reader see what has moved since they arrived, as real sortable columns beside the live figures.

Building…

Loading a live grid…

This is the Angular version. A standalone component takes the whole configuration through one config input, surfaces grid events as outputs, and exposes the live grid on a getter for anything the inputs do not cover.

The configuration

import { Component } from '@angular/core';
import { bootstrapApplication } from '@angular/platform-browser';
import { createGrid } from '@toclocoinc/lattice-grid';
import '@toclocoinc/lattice-grid/css';
import { LatticeGridComponent, provideLattice } from '@toclocoinc/lattice-grid/angular';

const columns = [
  { field: 'symbol', title: 'Symbol', layout: { pin: 'start', width: 120 } },
  { field: 'desk', title: 'Desk', filter: { type: 'set' }, layout: { width: 120 } },
  { field: 'region', title: 'Region', filter: { type: 'set' }, layout: { width: 130 } },
  { field: 'price', title: 'Price', type: 'number' },
  // A shadow column is declared against another and maintained by the grid.
  { id: 'delta',  title: 'Change',   shadow: { of: 'price', kind: 'delta' }, type: 'number', format: { signed: true } },
  { id: 'pct',    title: 'Change %', shadow: { of: 'price', kind: 'deltaPercent' }, type: 'number', format: { style: 'percent', signed: true } },
  { id: 'moves',  title: 'Moves',    shadow: { of: 'price', kind: 'updates' }, type: 'number' },
  { id: 'streak', title: 'Streak',   shadow: { of: 'price', kind: 'streak' }, type: 'number', format: { signed: true } },
];

const rows = [/* a live price book */];



@Component({
  selector: 'app-root',
  standalone: true,
  imports: [LatticeGridComponent],
  template: '<lattice-grid [config]="grid" style="display:block;height:460px"></lattice-grid>',
})
export class AppComponent {
  grid = {
    rowKey: 'id',
    highlightOnChange: { duration: 500 },
    columns: columns,
    rows: rows,
  };
}

bootstrapApplication(AppComponent, {
  providers: [provideLattice({ createGrid })],
});