How to get number of selected options using jquery?

I have a multiple selection list which have more than 5 options. But i want to restrict the selection of the options to 2 or 3 options. How开发者_运维百科 to do it using jquery? How to get the count of selection options in multiple selection list? I am using jquery validation plugin.

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You can use the :selected selector to select them, then get the .length, like this:

var count = $("#mySelect :selected").length;

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You can get the number of selected items in the multiselect with the following:

$('#selectList :selected').length

Where #selectList is the id of your .

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var n = $("input:checked").length; see this for more detail: http://api.jquery.com/checked-selector/

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For checkboxes I'm using:

$('input[name="InputName"]:checked').size()

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I use select2 for multi select and this worked with me

 $("#selectedItems").val().length;

note that 'selectedItems' is the id of multiselect list