Create complex context menu

If you set the value of title to a HTML element reference, you can add complex functionality to the context menu. To prevent the context menu from closing call e.stopPropagation on the object clicked on.

import canvasDatagrid from 'canvas-datagrid';
import data from '/data.json';

const app = document.getElementById('app');
const content = document.createElement('div');
const upButton = document.createElement('button');
const downButton = document.createElement('button');
const gridElement = document.createElement('div');
const grid = canvasDatagrid({
  parentNode: gridElement,
  data,
});

app.append(gridElement);

grid.style.height = '250px';
content.appendChild(upButton);
content.appendChild(downButton);
upButton.innerHTML = 'Scroll Up';
downButton.innerHTML = 'Scroll Down';
upButton.addEventListener('click', function (e) {
  grid.scrollTop -= 10;
  e.stopPropagation();
});
downButton.addEventListener('click', function (e) {
  grid.scrollTop += 10;
  e.stopPropagation();
});
content.addEventListener('click', function (e) {
  e.stopPropagation();
});
grid.addEventListener('contextmenu', function (e) {
  e.items.splice(0, e.items.length);
  e.items.push({
    title: content,
  });
});