[英]jQuery find previous table row that has a cell with a specific class
Suppose I have a table like so: 假设我有一个像这样的表:
<table>
<tr><td class="this-is-a-label">Label Cell</td></tr>
<tr><td>Detail 1</td></tr>
<tr><td class="selected">Detail 2</td></tr>
</table>
I want to be able to grab the previous "Label Cell" from the "Selected" cell. 我希望能够从“选定”单元格中获取先前的“标签单元格”。
My jQuery script should be something like: 我的jQuery脚本应类似于:
$('.selected').each(function() {
var label = $(this).parent().prev('tr td.this-is-a-label');
//... do what I need with the label ...
});
But it's not working. 但这不起作用。
Does anyone have any suggestions? 有没有人有什么建议?
You can do this: 你可以这样做:
$('.selected').each(function() {
var label = $(this).closest('tr').prevAll('tr:has(td.this-is-a-label):first')
.children('td.this-is-a-label');
//... do what I need with the label ...
});
This isn't ideal though, it's a rather expensive DOM traversal, if you can guarantee it's always 2 rows behind, you can do this: 但是,这并不是理想的选择,它是一个相当昂贵的DOM遍历,如果可以保证它总是落后2行,则可以执行以下操作:
$(this).closest('tr').prev().prev().children('td.this-is-a-label')
...which is much faster, it just depends what assumptions and guarantees you can make about your markup, if there are any certainties, you can definitely make it faster. ...速度要快得多,这仅取决于您可以对标记做出什么样的假设和保证,如果有任何确定性,则绝对可以使标记速度更快。
How about: 怎么样:
var label =
$('.selected').parent().prevAll('tr').children('td.this-is-a-label')[0];
$("td.selected").parents("table").find("td.this-is-a-label").text();
Here's how you get references to both the <tr>
and <td>
dom elements: 这是获取对
<tr>
和<td>
dom元素的引用的方式:
$("tr:has(td.selected)").each(function(i, trSel){
var trLabel = $(trSel).prevAll("tr:has(td.this-is-a-label)").get(0);
var tdSel = $(trSel).children("td.selected").get(0);
var tdLabel = $(trLabel).children("td.this-is-a-label").get(0);
console.log(trSel, tdSel);
console.log(trLabel, tdLabel);
});
I created a little plugin in response to this post for the purpose of finding a cell which is relative to the current cell: 为了响应此帖子,我创建了一个小插件,目的是查找相对于当前单元格的单元格:
$.fn.cellFromCell = function(r,c,upOrDown) {
if(upOrDown == 'down') {
return $(this).parent().prevAll(':eq(' + r + ')').find('td:eq(' + c + ')').text();
} else {
return $(this).parent().nextAll(':eq(' + r + ')').find('td:eq(' + c + ')').text();
}
}
alert($('.selected').cellFromCell(1, 0, 'down')); // alerts "Label Cell"
alert($('.this-is-a-label').cellFromCell(0, 0)); // alerts "Detail 1"
I used your html for a simple test case. 我将您的html用于一个简单的测试用例。 You can mess with it here: http://jsfiddle.net/6kfVL/3/
您可以在这里弄乱它: http : //jsfiddle.net/6kfVL/3/
You can make it easy by coding in an HTML5 id tag when generating the table: 您可以通过在生成表格时对HTML5 id标记进行编码来简化操作:
<table id="myTable">
<tr id="label1"><td class="this-is-a-label">Label Cell</td></tr>
<tr data-parent-label-id="label1"><td>Detail 1</td></tr>
<tr data-parent-label-id="label1"><td class="selected">Detail 2</td> </tr>
</table>
You can then use the value, and even perform actions on the associated "parent": 然后,您可以使用该值,甚至可以对关联的“父级”执行操作:
$("#myTable").on("click", "tr", function() {
var associatedLabelId = $(this).data("parent-label-id");
alert("Parent label of the row clicked: " + associatedLabelId);
$("#" + associatedLabelId).addClass("highlight");
}
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