如何在 jQuery 的 SELECT 元素中选择特定选项? [英] How do you select a particular option in a SELECT element in jQuery?
问题描述
如果您知道索引、值或文本.如果您没有直接参考的 ID，也可以这样做.
示例标记
<select class="opts"><option selected value="DEFAULT">默认</option><option value="SEL1">选择1</option><option value="SEL2">选择2</option></选择>按值获取中间选项元素的选择器是
$('.selDiv option[value="SEL1"]')对于索引:
$('.selDiv option:eq(1)')对于已知文本:
$('.selDiv option:contains("Selection 1")')EDIT:正如上面所评论的，OP 可能是在更改下拉列表的选定项目之后.在 1.6 及更高版本中，推荐使用 prop() 方法:
$('.selDiv option:eq(1)').prop('selected', true)在旧版本中:
$('.selDiv option:eq(1)').attr('selected', 'selected')EDIT2:在 Ryan 发表评论之后.选择 10"上的匹配可能是不需要的.我发现没有 selector 来匹配全文，但是有一个 filter 工作:
$('.selDiv 选项').filter(function(i, e) { return $(e).text() == "Selection 1"})EDIT3:使用 $(e).text() 时要小心，因为它可能包含导致比较失败的换行符.This happens when the options are implicitly closed (no </option> tag):
如果您只是使用 e.text 任何额外的空格，如尾随换行符，都将被删除，使比较更加稳健.
If you know the Index, Value or Text. also if you don't have an ID for a direct reference.
This, this and this are all helpful answers.
Example markup
<div class="selDiv">
<select class="opts">
<option selected value="DEFAULT">Default</option>
<option value="SEL1">Selection 1</option>
<option value="SEL2">Selection 2</option>
</select>
</div>
A selector to get the middle option-element by value is
$('.selDiv option[value="SEL1"]')
For an index:
$('.selDiv option:eq(1)')
For a known text:
$('.selDiv option:contains("Selection 1")')
EDIT: As commented above the OP might have been after changing the selected item of the dropdown. In version 1.6 and higher the prop() method is recommended:
$('.selDiv option:eq(1)').prop('selected', true)
In older versions:
$('.selDiv option:eq(1)').attr('selected', 'selected')
EDIT2: after Ryan's comment. A match on "Selection 10" might be unwanted. I found no selector to match the full text, but a filter works:
$('.selDiv option')
.filter(function(i, e) { return $(e).text() == "Selection 1"})
EDIT3: Use caution with $(e).text() as it can contain a newline making the comparison fail. This happens when the options are implicitly closed (no </option> tag):
<select ...>
<option value="1">Selection 1
<option value="2">Selection 2
:
</select>
If you simply use e.text any extra whitespace like the trailing newline will be removed, making the comparison more robust.
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