合并单元格时要怎么处理?
时间: 2023-08-01 15:07:08 浏览: 140
当表格中存在合并单元格时,拖拽列排序需要特殊处理。
首先,需要判断当前拖拽的列是否会影响到合并单元格的范围。如果当前列的左右两侧存在被合并的单元格,那么拖拽列排序时,需要同时改变这些被合并的单元格范围。
其次,当表格中存在被合并的单元格时,需要在拖拽过程中限制占位符单元格的位置,避免占位符单元格跨越合并单元格的范围,导致表格显示异常。
以下是修改后的代码示例:
```html
<table>
<thead>
<tr>
<th colspan="2" onmousedown="startDrag(event, 0)">列1</th>
<th onmousedown="startDrag(event, 1)">列2</th>
<th onmousedown="startDrag(event, 2)">列3</th>
</tr>
</thead>
<tbody>
<tr>
<td rowspan="2">1</td>
<td>2</td>
<td>3</td>
<td>4</td>
</tr>
<tr>
<td>5</td>
<td>6</td>
<td>7</td>
</tr>
</tbody>
</table>
<script>
var dragCell = null;
var dragLine = null;
var placeholderCell = null;
function startDrag(event, col) {
dragCell = event.target;
placeholderCell = dragCell.cloneNode(true);
placeholderCell.style.visibility = 'hidden';
dragLine = document.createElement('div');
dragLine.className = 'drag-line';
document.body.appendChild(dragLine);
document.body.appendChild(placeholderCell);
document.addEventListener('mousemove', doDrag);
document.addEventListener('mouseup', endDrag);
}
function doDrag(event) {
dragLine.style.left = event.clientX + 'px';
placeholderCell.style.left = event.clientX + 'px';
var nextCell = null;
for (var i = 0; i < dragCell.parentNode.children.length; i++) {
var cell = dragCell.parentNode.children[i];
if (cell !== dragCell && cell.getBoundingClientRect().left < event.clientX) {
nextCell = cell.nextSibling;
}
}
if (nextCell === null) {
nextCell = dragCell.parentNode.children[dragCell.parentNode.children.length - 1].nextSibling;
}
if (nextCell !== null && nextCell !== placeholderCell.nextSibling) {
// 检查是否会影响到合并单元格的范围
var colSpan = parseInt(dragCell.getAttribute('colspan') || '1');
var nextColSpan = parseInt(nextCell.getAttribute('colspan') || '1');
var rowSpan = parseInt(dragCell.getAttribute('rowspan') || '1');
var nextRowSpan = parseInt(nextCell.getAttribute('rowspan') || '1');
var colStart = 0;
var colEnd = 0;
var nextColStart = 0;
var nextColEnd = 0;
var rowStart = 0;
var rowEnd = 0;
var nextRowStart = 0;
var nextRowEnd = 0;
var col = 0;
for (var i = 0; i < dragCell.parentNode.children.length; i++) {
var cell = dragCell.parentNode.children[i];
if (cell === dragCell) {
colStart = col;
colEnd = col + colSpan - 1;
}
if (cell === nextCell) {
nextColStart = col;
nextColEnd = col + nextColSpan - 1;
}
if (col <= colEnd && col >= colStart) {
rowStart = rowEnd + 1;
rowEnd = rowStart + rowSpan - 1;
}
if (col <= nextColEnd && col >= nextColStart) {
nextRowStart = nextRowEnd + 1;
nextRowEnd = nextRowStart + nextRowSpan - 1;
}
col += parseInt(cell.getAttribute('colspan') || '1');
}
if (nextRowStart <= rowEnd || nextRowEnd >= rowStart) {
return;
}
dragCell.parentNode.insertBefore(placeholderCell, nextCell);
}
}
function endDrag(event) {
dragCell.parentNode.insertBefore(dragCell, placeholderCell);
document.body.removeChild(dragLine);
document.body.removeChild(placeholderCell);
dragCell = null;
dragLine = null;
placeholderCell = null;
document.removeEventListener('mousemove', doDrag);
document.removeEventListener('mouseup', endDrag);
}
</script>
```
注意,合并单元格的处理需要根据具体情况进行调整,以上代码仅供参考。
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