javascript 使用javascript交换行
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swapping rows using a javascript
提问by nithin
I've a multiple number of rows which is generated by a for condition, with 2 icons up and down. On click of up the selected row should move one step up, and on click of down the selected row should move one step down
我有多个由 for 条件生成的行，上下有 2 个图标。单击向上所选行应向上移动一步，向下单击所选行应向下移动一步
<html>
<head>
<body>
<form name="myForm">
<table id="mainTable" border="1" width="100%">
<script>
document.write('<tr>')
document.write('<td>')
document.write('row1')
document.write('</td>')
document.write('</tr>')
document.write('<tr>')
document.write('<td>')
document.write('row2')
document.write('</td>')
document.write('</tr>')
document.write('</table>')
document.write('<table>')
document.write('<tr>')
document.write('<td>')
document.write('<input type="button" value=" move UP " onClick="swapRowUp(getRowIndex(this))"</input>')>
document.write('<input type="button" value="move DOWN" onClick="swapRowDown(getRowIndex(this))"</input>')>
document.write('</td>')
document.write('</tr>')
document.write('</table>')
</script>
</table>
</form>
</body>
</head>
</html>
<script>
var mainTable = document.getElementById("mainTable");
function getRowIndex(el)
{
while( (el = el.parentNode) && el.nodeName.toLowerCase() !== 'tr' );
if( el )
alert(el.rowIndex);
return el.rowIndex;
}
function swapRowUp(chosenRow) {
if (chosenRow.rowIndex != 0) {
moveRow(chosenRow, chosenRow.rowIndex-1);
}
}
function swapRowDown(chosenRow) {
if (chosenRow.rowIndex != mainTable.rows.length-1) {
moveRow(chosenRow, chosenRow.rowIndex+1);
}
}
function moveRow(targetRow, newIndex) {
if (newIndex > targetRow.rowIndex) {
newIndex++;
}
var mainTable = document.getElementById('mainTable');
var theCopiedRow = mainTable.insertRow(newIndex);
for (var i=0; i<targetRow.cells.length; i++) {
var oldCell = targetRow.cells[i];
var newCell = document.createElement("TD");
newCell.innerHTML = oldCell.innerHTML;
theCopiedRow.appendChild(newCell);
copyChildNodeValues(targetRow.cells[i], newCell);
}
//delete the old row
mainTable.deleteRow(targetRow.rowIndex);
}
function copyChildNodeValues(sourceNode, targetNode) {
for (var i=0; i < sourceNode.childNodes.length; i++) {
try{
targetNode.childNodes[i].value = sourceNode.childNodes[i].value;
}
catch(e){
}
}
}
</script>
i'm unable to perform the swap operation, i get cellIndex as null
我无法执行交换操作，我将 cellIndex 设为 null
回答by Raynos
You can use some sensible JavaScript
你可以使用一些合理的 JavaScript
up.addEventListener("click", function moveRowUp() {
var row = this.parentNode.parentNode,
sibling = row.previousElementSibling,
parent = row.parentNode;
parent.insertBefore(row, sibling);
});
for some sensible HTML
对于一些合理的 HTML
<table>
<tbody>
<tr>
<td> 1 </td>
<td> filler </td>
</tr>
<tr>
<td> 2 </td>
<td> <button id="up">up</button> </td>
</tr>
</tbody>
</table>
