blocks|key|2000195|text|您可以使用下面这样的内容|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2000196|if+($("#formID+input:checkbox:checked").length+>+0)
{
++++//+any+one+is+checked
}
else
{
+++//+none+is+checked
}|code-block|syntax|javascript|2000197|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use something like this

<pre><code>if ($("#formID input:checkbox:checked").length &gt; 0)
{
 // any one is checked
}
else
{
 // none is checked
}
</code></pre>

blocks|key|2000202|text|你可以在这里简单的返回.length：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2000203|function+areAnyChecked(formID)+{
++return+!!$('#'%2BformID%2B'+input[type=checkbox]:checked').length;
}|code-block|syntax|javascript|2000204|这将查找给定表单中的复选框，查看是否有为:checked的复选框，如果是，则返回true+(否则长度将为0)。为了让它更清楚，这里是非布尔转换版本：|2000205|function+howManyAreChecked(formID)+{
++return+$('#'%2BformID%2B'+input[type=checkbox]:checked').length;
}|2000206|这将返回已检查的数量的计数。|2000207|entityMap|0|LINK|mutability|MUTABLE|url|http://api.jquery.com/length/|1|http://api.jquery.com/checked-selector/^0|B|7|B|7|0|0|0|K|8|14|4|K|8|1|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|M|3|N|5|H|7|1F|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1G|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]|Y|$5|T|U|V|E|$W|Z]]]]

You can do a simple return of the <a href="http://api.jquery.com/length/" rel="nofollow"><code>.length</code></a> here:

<pre><code>function areAnyChecked(formID) {
 return !!$('#'+formID+' input[type=checkbox]:checked').length;
}
</code></pre>

This look for checkboxes in the given form, sees if any are <a href="http://api.jquery.com/checked-selector/" rel="nofollow"><code>:checked</code></a> and returns <code>true</code> if they are (since the length would be 0 otherwise). To make it a bit clearer, here's the non boolean converted version:

<pre><code>function howManyAreChecked(formID) {
 return $('#'+formID+' input[type=checkbox]:checked').length;
}
</code></pre>

This would return a count of how many were checked.

blocks|key|2000241|text|JQuery+.is将测试所有指定的元素，如果至少有一个元素与选择器匹配，则返回true：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2000242|if+($(":checkbox[name='choices']",+form).is(":checked"))
{
++++//+one+or+more+checked
}
else
{
++++//+nothing+checked
}|code-block|syntax|javascript|2000243|entityMap^0|7|3|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

JQuery <code>.is</code> will test all specified elements and return true if at least one of them matches selector:

<pre><code>if ($(":checkbox[name='choices']", form).is(":checked"))
{
 // one or more checked
}
else
{
 // nothing checked
}
</code></pre>

blocks|key|1786565|text|Rahul的答案最适合你的问题。无论如何，如果您有一组复选框要选中，而不是表单中的所有复选框，您可以选择它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1786566|为您要选中的所有复选框指定一个类名，例如，一个类名test_check，现在您可以通过以下方式检查是否选中了属于该组的任何复选框：|offset|length|style|CODE|1786567|$("#formID+.test_check:checked").length+>+0|code-block|syntax|javascript|1786568|如果返回true，则假定选中了一个或多个复选框，如果返回false，则选中一个或多个复选框，其中类名为test_check。|1786569|希望这能帮助到别人。谢谢:)-|1786570|entityMap^0|0|P|A|0|0|4|4|S|5|1F|A|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|X|8|@$D|Y|E|Z|F|G]|$D|10|E|11|F|G]|$D|12|E|13|F|G]]|9|@]|A|$]]|$1|O|3|P|5|6|7|14|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|R|$]]

Rahul's answer is best fit for your question. Anyway, if you have a group of checkboxes to be checked and not all the checkbox in your form, you can go for it.

Put a classname for all the checkboxes you want to check, say for example, a classname <code>test_check</code> and now you can check if any of the checkbox is checked belonging to the group by:

<pre><code>$("#formID .test_check:checked").length &gt; 0
</code></pre>

If it returns <code>true</code>, assume that one or more checkboxes are checked having the classname <code>test_check</code> and none checked if returns <code>false</code>. 

Hope it helps someone. Thanks :)-

blocks|key|2000401|text|这是我用来检查复选框列表中是否有任何复选框已更改的内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2000402|$('input[type="checkbox"]').change(function(){+

++++++++var+itemName+=+$('select+option:selected').text();++

+++++++++//Do+something.

});+++++|code-block|syntax|javascript|2000403|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is what I used for checking if any checkboxes in a list of checkboxes had changed:

<pre><code>$('input[type="checkbox"]').change(function(){ 

 var itemName = $('select option:selected').text(); 

 //Do something.

}); 
</code></pre>

blocks|key|1786653|text|在不使用'length‘的情况下，你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1786654|if+($('input[type=checkbox]').is(":checked"))+{
++++++//any+one+is+checked
}
else+{
//none+is+checked
}|code-block|syntax|javascript|1786655|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Without using 'length' you can do it like this:

<pre><code>if ($('input[type=checkbox]').is(":checked")) {
 //any one is checked
}
else {
//none is checked
}
</code></pre>

blocks|key|2000529|text|这是解决这个问题的最好方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2000530|++if($("#checkbox").is(":checked")){

++//+Do+something+here+/////

++};|code-block|syntax|javascript|2000531|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is the best way to solve this problem.
<pre><code> if($(&quot;#checkbox&quot;).is(&quot;:checked&quot;)){

 // Do something here /////

 };
</code></pre>

I know how to see if an individual checkbox is selected or not.

But Im having trouble with the following - given a form id I need to see if any of the checkboxes are selected (i.e 1 or more), and I need to see if none are selected. Basically I need two separate functions that answer these two questions. Help would be appreciated. Thanks!

Actually, I would just need a function to tell me if none are selected. Knowing this would answer the other question.

jQuery see if any or no checkboxes are selected

我知道如何查看是否选中了单个复选框。但我在以下方面遇到了问题-给定一个表单id，我需要查看是否选中了任何复选框(即1个或更多)，并且我需要查看是否没有选中。基本上，我需要两个单独的函数来回答这两个问题。如果能帮上忙，我们将不胜感激。谢谢!实际上，我只需要一个函数来告诉我是否没有被选中。知道这一点将会回答另一个问题。

问jQuery查看是否选中了任何复选框
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