demo/nested.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Nested grids demo</title>
  <link rel="stylesheet" href="demo.css"/>
  <link rel="stylesheet" href="../dist/gridstack-extra.min.css"/>
  <script src="../dist/gridstack-all.js"></script>
</head>
<body>
  <div class="container-fluid">
    <h1>Nested grids demo</h1>
    <p>This example shows v5.x dragging between nested grids (dark yellow) and parent grid (bright yellow.)<br>
      Use v9.2 <b>sizeToContent:true</b> on first subgrid item parent to grow/shrink as needed, while leaving leaf green items unchanged.<br>
      Uses v3.1 API to load the entire nested grid from JSON.<br>
      Nested grids uses v5 <b>column:'auto'</b> to keep items same size during resize.</p>
    <div class="actions" style="display: flex; flex-direction: row; gap: 5px;">
      <a class="btn btn-primary" onClick="addWidget()" href="#">Add Widget</a>
      <a class="btn btn-primary" onClick="addNewWidget('.sub1')" href="#">Add Widget Grid1</a>
      <a class="btn btn-primary" onClick="addNewWidget('.sub2')" href="#">Add Widget Grid2</a>
      <a class="btn btn-primary" onClick="addNested()" href="#">Add Nested Grid</a>
      <div class="sidebar" style="height:50px; padding: 0">
        <!-- manually force a drop size of 2x2 for nested size -->
        <div class="grid-stack-item" gs-w="2" gs-h="2">
          <div class="grid-stack-item-content">Drag nested</div>
        </div>
      </div>  
    </div>
    <br />
    <span>entire save/re-create:</span>
    <a class="btn btn-primary" onClick="save()" href="#">Save</a>
    <a class="btn btn-primary" onClick="destroy()" href="#">Destroy</a>
    <a class="btn btn-primary" onClick="load()" href="#">Create</a>
    <span>partial save/load:</span>
    <a class="btn btn-primary" onClick="save(true, false)" href="#">Save list</a>
    <a class="btn btn-primary" onClick="save(false, false)" href="#">Save no content</a>
    <a class="btn btn-primary" onClick="destroy(false)" href="#">Clear</a>
    <a class="btn btn-primary" onClick="load(false)" href="#">Load</a>
    <br><br>
    <!-- grid will be added here -->
  </div>
  <script src="events.js"></script>
  <script type="text/javascript">
    let sub1 = [ {x:0, y:0}, {x:1, y:0}, {x:2, y:0}, {x:3, y:0}, {x:0, y:1}, {x:1, y:1}];
    let sub2 = [ {x:0, y:0, h:2}, {x:1, y:1, w:2}];
    let count = 0;
    [...sub1, ...sub2].forEach(d => d.content = String(count++));
    let subOptions = {
      cellHeight: 50, // should be 50 - top/bottom
      column: 'auto', // size to match container. make sure to include gridstack-extra.min.css
      acceptWidgets: true, // will accept .grid-stack-item by default
      margin: 5,
    };
    let options = { // main grid options
      cellHeight: 50,
      margin: 5,
      minRow: 2, // don't collapse when empty
      acceptWidgets: true,
      id: 'main',
      subGridOpts: subOptions, // all sub grids will default to those
      children: [
        {x:0, y:0, content: 'regular item'},
        {x:1, y:0, w:4, h:4, sizeToContent: true, subGridOpts: {children: sub1, id:'sub1_grid', class: 'sub1'}},
        {x:5, y:0, w:3, h:4, subGridOpts: {children: sub2, id:'sub2_grid', class: 'sub2'}},
      ]
    };

    // create and load it all from JSON above
    let grid = GridStack.addGrid(document.querySelector('.container-fluid'), options);

    // add debug event handlers to each grid (no global set on parent yet)
    let gridEls = GridStack.getElements('.grid-stack');
    gridEls.forEach(gridEl => {
      let grid = gridEl.gridstack;
      addEvents(grid, grid.opts.id);
    })

    // setup drag drop behavior
    GridStack.setupDragIn('.sidebar .grid-stack-item', { appendTo: 'body', helper: 'clone' });

    function addWidget() {
      grid.addWidget({x:0, y:100, content:"new item"});
    }

    function addNested() {
      grid.addWidget({x:0, y:100, sizeToContent: true, subGridOpts: {
        children: [ {content: 'hello'}, {y:1, content: 'world'}],
        ...subOptions}
      });
    }

    function addNewWidget(selector) {
      let subGrid = document.querySelector(selector).gridstack;
      let node = {
        x: Math.round(6 * Math.random()),
        y: Math.round(5 * Math.random()),
        w: Math.round(1 + 1 * Math.random()),
        h: Math.round(1 + 1 * Math.random()),
        content: String(count++)
      };
      subGrid.addWidget(node);
      return false;
    };

    // listener on drop event: every time the sidebar item is dropped create a new subgrid
    function droppedHandler(event, prevNode, n) {
      // if we don't have a prevNode that means it came from toolbar, which today is the only nested case (else check for some node.el.getAttribute or some custom field...)
      if (prevNode) return;

      // clear the content then make it a subgrid
      n.el.querySelector('.grid-stack-item-content').innerHTML = '';
      let nodeToAdd = { children: [{content: 'nest 1'}, {content: 'nest 2'}]};
      let subgrid = n.grid.makeSubGrid(n.el, nodeToAdd, undefined, false);
      
      // add a listener to the subgrid to allow widgets to be added into this newly created nested widget
      subgrid.on('dropped', droppedHandler);
    }
    // add listener to the main grid and subgrids
    grid.on('dropped', droppedHandler);
    document.querySelectorAll('.grid-stack-nested').forEach((subGrid) => {
      subGrid.gridstack.on('dropped', droppedHandler);
    });

    //--- end of Drag and Drop Nested widget logic

    function save(content = true, full = true) {
      options = grid.save(content, full);
      console.log(options);
      // console.log(JSON.stringify(options));
    }
    function destroy(full = true) {
      if (full) {
        grid.off('dropped');
        grid.destroy();
        grid = undefined;
      } else {
        grid.removeAll();
      }
    }
    function load(full = true) {
      if (full) {
        grid = GridStack.addGrid(document.querySelector('.container-fluid'), options);
        grid.on('dropped', droppedHandler);
      } else {
        grid.load(options);
      }
    }
  </script>
</body>
</html>