jQuery 检查“这个”复选框是否被选中
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Check if 'this' checkbox is checked
提问by Zabs
How can I work out if 'this' checkbox has been checked using the this command?
如何确定是否使用此命令选中了“this”复选框？
I have the following but not sure how to implement this (so it only checks the single checkbox selected rather than all on the page
我有以下但不确定如何实现这一点（所以它只检查选中的单个复选框而不是页面上的所有复选框
if ($('input[type="checkbox"]').is(':checked')
回答by devnull69
What about this?
那这个呢？
if($(this).is(':checked'))
回答by lonesomeday
Presumably you mean thisin the context of an event handler... In which case, just test the checkedproperty:
大概你的意思是this在事件处理程序的上下文中......在这种情况下，只需测试checked属性：
$('input[type="checkbox"]').click(function() {
if (this.checked) {
// checkbox clicked is now checked
}
});
Note that you can do the same with the following methods:
请注意，您可以使用以下方法执行相同操作：
$(this).is(':checked')$(this).prop('checked')
$(this).is(':checked')$(this).prop('checked')
However, this.checkedavoids creating a new jQuery object, so is far more efficient (and quicker to code). isis the slowest: it takes twice as long as propand approximately 100 times as long as the simple property lookup.
但是，this.checked避免创建新的 jQuery 对象，因此效率更高（并且编码更快）。is是最慢的：它花费的prop时间是简单属性查找的两倍和大约 100 倍。
回答by robasta
You need to use the ID selector. The input[type="checkbox"] selector will return 'all checkboxes.
您需要使用 ID 选择器。input[type="checkbox"] 选择器将返回“所有复选框”。
if ($('#Checkbox1').is(':checked'))
where Checkbox1 is the ID of the checkbox
其中 Checkbox1 是复选框的 ID
回答by Ayman Safadi
Look into prop(): http://api.jquery.com/prop/
查看prop()：http: //api.jquery.com/prop/
The docs provide multiple of better ways to check for a "checked" checkbox.
文档提供了多种更好的方法来检查“已选中”复选框。
elem.checked | true (Boolean) Will change with checkbox state
$(elem).prop("checked") | true (Boolean) Will change with checkbox state
elem.getAttribute("checked") | "checked" (String) Initial state of the checkbox; does not change
$(elem).attr("checked")(1.6) | "checked" (String) Initial state of the checkbox; does not change
$(elem).attr("checked")(1.6.1+) | "checked" (String) Will change with checkbox state
$(elem).attr("checked")(pre-1.6) | true (Boolean) Changed with checkbox state
回答by YuS
Did you mean like this (0 is index):
您的意思是这样吗（0 是索引）：
if ($(':checkbox').get(0).is(':checked'))
Or like this:
或者像这样：
if ($(this).is(':checked'))
回答by Robbo_UK
try the following, where you know the id
尝试以下操作，其中您知道 ID
$('#edit-checkbox-id').is(':checked');
or if you are already refering to the item with this keyword
或者如果您已经使用此关键字引用了该项目
$(this).is(':checked');
回答by Salvatore Di Fazio
I use the following:
我使用以下内容：
$(this).find('input[type="checkbox"]:checked')
this example returns all the checkbox was checked
此示例返回所有选中的复选框
