Handsontable：如何对行求和？

Question

我从数据库中动态获取列，所以我不知道会有多少列，但是行数是固定的。

这是一个示例

  var data = [
      ['', 'Tesla', 'Nissan', 'Toyota', 'Honda'],
      ['number of cars', -5, 5, 12, 13],
      ['price of a car', 10, -11, 14, 13],
    ['tax', 2, 15, -12, 30],
      ['Total price of all cars', 10, -11, 14, 13],
      ['price before tax', 2, 15, -12, 30],
      ['price after tax', 2, 15, -12, 30]
    ],
    container,
    hot1;
  
  function firstRowRenderer(instance, td, row, col, prop, value, cellProperties) {
    Handsontable.renderers.TextRenderer.apply(this, arguments);
    td.style.fontWeight = 'bold';
    td.style.color = 'green';
    td.style.background = '#CEC';
  }
  
  function negativeValueRenderer(instance, td, row, col, prop, value, cellProperties) {
    Handsontable.renderers.TextRenderer.apply(this, arguments);
  
    // if row contains negative number
    if (parseInt(value, 10) < 0) {
      // add class "negative"
      td.className = 'make-me-red';
    }
  
    if (!value || value === '') {
      td.style.background = '#EEE';
    }
    else {
      if (value === 'Nissan') {
        td.style.fontStyle = 'italic';
      }
      td.style.background = '';
    }
  }
  // maps function to lookup string
  Handsontable.renderers.registerRenderer('negativeValueRenderer', negativeValueRenderer);
  
  container = document.getElementById('example1');
  hot1 = new Handsontable(container, {
    data: data,
    licenseKey: 'non-commercial-and-evaluation',
    afterSelection: function (row, col, row2, col2) {
      var meta = this.getCellMeta(row2, col2);
  
      if (meta.readOnly) {
        this.updateSettings({fillHandle: false});
      }
      else {
        this.updateSettings({fillHandle: true});
      }
    },
    cells: function (row, col) {
      var cellProperties = {};
      var data = this.instance.getData();
  
      if (row === 0 || data[row] && data[row][col] === 'readOnly') {
        cellProperties.readOnly = true; // make cell read-only if it is first row or the text reads 'readOnly'
      }
      if (row === 0) {
        cellProperties.renderer = firstRowRenderer; // uses function directly
      }
      else {
        cellProperties.renderer = "negativeValueRenderer"; // uses lookup map
      }
  
      return cellProperties;
    }
  });

.make-me-red {
  color: #f00;
}

<link type="text/css" rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/handsontable.full.min.css">

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/handsontable.full.min.js"></script>
<div id="example1" class="hot1 hot handsontable"></div>

我从数据库中获得了汽车数量。您定义：

• 汽车价格
• 每辆车的税金

所有汽车的总价应为汽车总数*每辆汽车的价格

税后价格应为汽车价格+税。

[我现在所能做的就是setDataAtCell like this，我想要类似setDataAtRow的东西，但我不想将单元格指定为参数。

Answer 1

您可以使用Hansontable列摘要，无需使用setDataAtCell / setDataAtRow方法。

https://handsontable.com/docs/7.3.0/demo-summary-calculations.html

columnSummary: function() {
        // hotInstance(get total rows and total columns)
				let sumRow =  this.hot.countRows() - 1;
				let colSummaryArr = [];
				if(this.hot.countCols() > 0) {
          // sum would be for column 3 onwards
				  for(let i = 3; i < this.hot.countCols(); i++) {
					colSummaryArr.push({
					 destinationRow: sumRow - 1,
					 destinationColumn: i,
					 type: 'sum',
					 ranges: [
					  [0, this.hot.countRows() - 3]
				     ],
					})
          // custom eg which calculates difference of sum row with certain value 
					colSummaryArr.push({
					 type: 'custom',
					 destinationRow: sumRow,
					 destinationColumn: i,
					 customFunction: function(endpoint) {
					  var hotInstance = this.hot;
					  function checkRange() {
					  let sum  = 0;
					  for(let i = 0; i < hotInstance.countRows()-2; i++) {
						sum += hotInstance.getDataAtCell(i, endpoint.destinationColumn);
					  }
					  return sum;
					}
					return 8 - checkRange();
					}
				})
			   }										
			   return colSummaryArr;
			   }
			   else {
				 return [];
			   }
			},