关于AG-Grid视口模型行分组的自定义groupCellRenderer示例请求

Absolutely! I’ve got you covered with a practical, production-ready example of a custom groupCellRenderer built specifically for AG Grid’s viewport model. This renderer handles all core grouping needs—expanding/collapsing groups, displaying group labels, and even showing item counts for clarity.

Core Functionality #

• Toggle group expansion/collapse with a clickable icon
• Display the group key (e.g., category name) alongside the number of items in the group
• Refresh dynamically when group state or data changes
• Lightweight design optimized for the viewport model’s performance constraints

Full Renderer Implementation #

// Custom Group Cell Renderer tailored for Viewport Model
function CustomGroupCellRenderer() {}

CustomGroupCellRenderer.prototype.init = function(params) {
    this.params = params;
    this.eGui = document.createElement('div');
    
    // Style the container for alignment and padding
    this.eGui.style.display = 'flex';
    this.eGui.style.alignItems = 'center';
    this.eGui.style.padding = '8px 12px';

    // Expand/Collapse Toggle Button
    this.eExpander = document.createElement('span');
    this.eExpander.innerHTML = params.node.expanded ? '▼' : '▶';
    this.eExpander.style.cursor = 'pointer';
    this.eExpander.style.marginRight = '8px';
    this.eExpander.addEventListener('click', () => this.toggleExpansion());

    // Group Label with Item Count
    this.eLabel = document.createElement('span');
    this.eLabel.textContent = `${params.node.key} (${params.node.children.length} items)`;
    this.eLabel.style.flexGrow = '1';
    this.eLabel.style.fontWeight = '500';

    // Assemble the UI elements
    this.eGui.appendChild(this.eExpander);
    this.eGui.appendChild(this.eLabel);
};

CustomGroupCellRenderer.prototype.getGui = function() {
    return this.eGui;
};

CustomGroupCellRenderer.prototype.refresh = function(params) {
    // Update expander icon when group state changes
    this.eExpander.innerHTML = params.node.expanded ? '▼' : '▶';
    // Refresh item count if data updates
    this.eLabel.textContent = `${params.node.key} (${params.node.children.length} items)`;
    return true;
};

CustomGroupCellRenderer.prototype.toggleExpansion = function() {
    this.params.node.setExpanded(!this.params.node.expanded);
};

How to Use in Your Grid Configuration #

// AG Grid Configuration with Viewport Model
const gridOptions = {
    rowModelType: 'viewport',
    columnDefs: [
        {
            field: 'category',
            rowGroup: true,
            hide: false,
            cellRenderer: 'customGroupCellRenderer' // Attach our custom renderer
        },
        { field: 'productName', headerName: 'Product' },
        { field: 'price', headerName: 'Price', valueFormatter: params => `$${params.value.toFixed(2)}` }
    ],
    frameworkComponents: {
        customGroupCellRenderer: CustomGroupCellRenderer
    },
    // Required Viewport Model settings
    pagination: true,
    paginationPageSize: 100,
    cacheBlockSize: 100,
    // Optional: Define auto-group column if using default grouping
    autoGroupColumnDef: {
        headerName: 'Category',
        cellRenderer: 'customGroupCellRenderer'
    }
};

Key Notes #

• Since the viewport model only renders visible rows, this renderer avoids heavy DOM operations to keep performance snappy
• You can extend this further—add aggregated values (like total group price) by accessing params.node.aggData in the init or refresh methods
• The renderer follows AG Grid’s official cell renderer interface, so it integrates seamlessly with viewport model lifecycle events

内容的提问来源于stack exchange，提问作者Dmitry