写一个动态合并单元格前后端java代码
时间: 2023-06-14 14:03:46 浏览: 240
动态合并单元格
前端代码:
```html
<table>
<thead>
<tr>
<th>姓名</th>
<th>年龄</th>
<th>性别</th>
</tr>
</thead>
<tbody>
<tr>
<td rowspan="2">张三</td>
<td>25</td>
<td>男</td>
</tr>
<tr>
<td>30</td>
<td>男</td>
</tr>
<tr>
<td>李四</td>
<td>28</td>
<td>女</td>
</tr>
<tr>
<td colspan="3">总人数:3</td>
</tr>
</tbody>
</table>
<button onclick="mergeCells()">合并单元格</button>
```
上面的代码中,我们使用了HTML中的`rowspan`和`colspan`属性来合并单元格,并添加了一个按钮用于触发合并单元格的函数。
下面是JavaScript代码:
```javascript
function mergeCells() {
var table = document.getElementsByTagName('table')[0];
var rows = table.rows;
var rowNum = rows.length;
var colNum = rows[0].cells.length;
var mergedCells = [];
// 遍历表格,寻找可以合并的单元格
for (var i = 0; i < rowNum; i++) {
for (var j = 0; j < colNum; j++) {
var cell = rows[i].cells[j];
if (cell.innerHTML !== '') {
var rowspan = cell.getAttribute('rowspan') || 1;
var colspan = cell.getAttribute('colspan') || 1;
rowspan = parseInt(rowspan);
colspan = parseInt(colspan);
for (var r = 0; r < rowspan; r++) {
for (var c = 0; c < colspan; c++) {
if (r === 0 && c === 0) {
continue;
}
var mergedRow = rows[i + r];
if (!mergedRow) {
mergedRow = document.createElement('tr');
table.appendChild(mergedRow);
}
var mergedCell = mergedRow.cells[j + c];
if (!mergedCell) {
mergedCell = document.createElement('td');
mergedRow.appendChild(mergedCell);
}
mergedCell.style.display = 'none';
mergedCells.push(mergedCell);
}
}
}
}
}
// 合并单元格
for (var i = 0; i < mergedCells.length; i++) {
var mergedCell = mergedCells[i];
var nextCell = mergedCell.nextSibling;
while (nextCell && nextCell.style.display === 'none') {
nextCell = nextCell.nextSibling;
}
mergedCell.colSpan = nextCell.cellIndex - mergedCell.cellIndex + 1;
mergedCell.style.display = '';
}
}
```
该函数首先获取表格的行数和列数,然后遍历表格,寻找可以合并的单元格,并将需要合并的单元格保存在`mergedCells`数组中。最后,再次遍历`mergedCells`数组,将需要合并的单元格合并起来。
后端Java代码:
```java
public class MergeCells {
public static void main(String[] args) {
String[][] data = {
{"张三", "25", "男"},
{"", "30", "男"},
{"李四", "28", "女"}
};
int[] rowspan = new int[data.length];
int[] colspan = new int[data[0].length];
rowspan[0] = 2;
colspan[2] = 3;
String[][] mergedData = mergeCells(data, rowspan, colspan);
printTable(mergedData);
}
private static String[][] mergeCells(String[][] data, int[] rowspan, int[] colspan) {
int mergedRows = 0;
int mergedCols = 0;
for (int i = 0; i < rowspan.length; i++) {
mergedRows += rowspan[i];
}
for (int i = 0; i < colspan.length; i++) {
mergedCols += colspan[i];
}
String[][] mergedData = new String[mergedRows][mergedCols];
int rowOffset = 0;
for (int i = 0; i < data.length; i++) {
int colOffset = 0;
for (int j = 0; j < data[i].length; j++) {
if (rowspan[i] > 1 || colspan[j] > 1) {
for (int r = 0; r < rowspan[i]; r++) {
for (int c = 0; c < colspan[j]; c++) {
if (r == 0 && c == 0) {
mergedData[r + rowOffset][j + colOffset] = data[i][j];
} else {
mergedData[r + rowOffset][c + j + colOffset] = "";
}
}
}
colOffset += colspan[j] - 1;
} else {
mergedData[rowOffset][j + colOffset] = data[i][j];
}
}
rowOffset += rowspan[i];
}
return mergedData;
}
private static void printTable(String[][] data) {
for (int i = 0; i < data.length; i++) {
for (int j = 0; j < data[i].length; j++) {
System.out.print(data[i][j] + "\t");
}
System.out.println();
}
}
}
```
该代码使用了一个`mergeCells`函数来合并单元格,该函数接受一个二维数组`data`和两个一维数组`rowspan`和`colspan`作为参数,分别表示每个单元格的行跨度和列跨度。该函数首先计算出合并后表格的行数和列数,然后遍历`data`数组,将需要合并的单元格合并起来,并将结果保存在一个新的二维数组`mergedData`中。最后,该函数返回`mergedData`数组。
我们还编写了一个`printTable`函数用于打印表格,以便我们可以检查表格是否正确合并。
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