如果我有一个HTML表
<div id="myTabDiv">
<table name="mytab" id="mytab1">
<tr>
<td>col1 Val1</td>
<td>col2 Val2</td>
</tr>
<tr>
<td>col1 Val3</td>
<td>col2 Val4</td>
</tr>
</table>
</div>
我将如何遍历所有表行(假设行数可以改变每次检查)和检索值从每个单元格在每一行从JavaScript?
当前回答
我将其保留下来，以供将来参考，以便抓取特定的HTML表列并打印结果。
//select what table you want to scrape (is zero based)
//set 0 if there is only one
setTable=0;
//select what column you want to scrape (is zero based)
//in this case I would be scrapping column 2
setColumnToScrape=1;
var table = document.getElementsByTagName("tbody")[setTable];
for (var i = 0, row; row = table.rows[i]; i++) {
col = row.cells[setColumnToScrape];
document.write(col.innerHTML + "<br>");
}
其他回答
这个解决方案对我来说非常有效
var table = document.getElementById("myTable").rows;
var y;
for(i = 0; i < # of rows; i++)
{ for(j = 0; j < # of columns; j++)
{
y = table[i].cells;
//do something with cells in a row
y[j].innerHTML = "";
}
}
如果你想遍历每一行(<tr>)，知道/识别行(<tr>)，并遍历每行(<tr>)的每一列(<td>)，那么这就是要走的路。
var table = document.getElementById("mytab1");
for (var i = 0, row; row = table.rows[i]; i++) {
//iterate through rows
//rows would be accessed using the "row" variable assigned in the for loop
for (var j = 0, col; col = row.cells[j]; j++) {
//iterate through columns
//columns would be accessed using the "col" variable assigned in the for loop
}
}
如果您只想遍历单元格(<td>)，忽略您所在的行，那么可以这样做。
var table = document.getElementById("mytab1");
for (var i = 0, cell; cell = table.cells[i]; i++) {
//iterate through cells
//cells would be accessed using the "cell" variable assigned in the for loop
}
这里有一个使用现代Javascript ES6+的解决方案
const rows = document.querySelector("table")?.rows;
if (!rows) {
return;
}
Array.from(rows).forEach(row => {
console.log(row);
const cells = Array.from(row.cells);
cells.forEach(cell => {
console.log(cell);
});
});
Array.from()将HTMLCollection的行和/或单元格转换为一个常规的Javascript数组，你可以迭代通过。
表的文档。行使用率:https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableElement/rows
行的文档。cell用法:https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableRowElement
这是一个使用childNodes和HTMLCollection的不同方法
<script>
var tab = document.getElementsByTagName("table")
for (var val of tab[0].childNodes[1].childNodes.values())
if (HTMLCollection.prototype.isPrototypeOf(val.children)) {
for (var i of val.children) {
console.log(i.childNodes[0])
}
}
</script>
您可以考虑使用jQuery。使用jQuery，这是超级简单的，可能看起来像这样:
$('#mytab1 tr').each(function(){
$(this).find('td').each(function(){
//do your stuff, you can use $(this) to get current cell
})
})
