How to count check-boxes using jQuery?

问题

I have tons of checkboxes that are either checked (checked="checked") or unchecked.

I would like to get the number of all checkboxes, unchecked and checked checkboxes.

With check-box I mean <input type="checkbox" />.

How to do it with jQuery? Thanks in advance!

回答1:

You could do:

var numberOfChecked = $('input:checkbox:checked').length;
var totalCheckboxes = $('input:checkbox').length;
var numberNotChecked = totalCheckboxes - numberOfChecked;

EDIT

Or even simple

var numberNotChecked = $('input:checkbox:not(":checked")').length;

回答2:

The following code worked for me.

$('input[name="chkGender[]"]:checked').length;

回答3:

Assume that you have a tr row with multiple checkboxes in it, and you want to count only if the first checkbox is checked.

You can do that by giving a class to the first checkbox

For example class='mycxk' and you can count that using the filter, like this

$('.mycxk').filter(':checked').length

回答4:

There are multiple methods to do that:

Method 1:

alert($('.checkbox_class_here:checked').size());

Method 2:

alert($('input[name=checkbox_name]').attr('checked'));

Method 3:

alert($(":checkbox:checked").length);

回答5:

You can do it by using name attibute, class, id or just universal checkbox; If you want to count only checked number of checkbox.

By the class name :

var countChk = $('checkbox.myclassboxName:checked').length;

By name attribute :

var countByName= $('checkbox[name=myAllcheckBoxName]:checked').length;

Complete code

$('checkbox.className').blur(function() {
    //count only checked checkbox 
    $('checkbox[name=myAllcheckBoxName]:checked').length;
});

来源：https://stackoverflow.com/questions/8011556/how-to-count-check-boxes-using-jquery

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jquery

checkbox

count

checked