Getting amount of checkboxes checked by name

Question

I'm trying to find out how many checkboxes have been checked but am having some trouble..

My checkboxes are all named delete[].

var count = ($('#form_store_setup input[name=delete]:checked').length);

...and this doesn't work at all:

var count = ($('#form_store_setup input[name=delete[]]:checked').length);

Rutland

just wrap delete[] in double quotes in your second example like var count = ($('#form_store_setup input[name="delete[]"]:checked').length); – Kelcie

Answer 1

Simply wrap delete[] in double quotes in your second example like this:

var count = ($('#form_store_setup input[name="delete[]"]:checked').length);

Kelcie

Answer 2

You need to escape the square brackets. Try this:

var count = $('#form_store_setup input[name=delete\\[\\]]:checked').length;

Or put the attribute value in quotes:

var count = $('#form_store_setup input[name="delete[]"]:checked').length;

Laurenelaurens

or var count = ($('#form_store_setup input[name="delete[]"]:checked').length); ? – Kelcie

Answer 3

Assuming you do not have any other named items, that begin with delete, you can use the "starts with" matching:

var count = ($('#form_store_setup input[name^=delete]:checked').length);

Gwenore

what if a checkbox has a name for example delete_this :/ – Kelcie

Just a suggestion, it does depend on what else is on the page... Bit puzzled why they have delete[] in the first place :) Updated answer to qualify usage only if no other delete... elements present. – Gwenore

@TrueBlueAussie it's used in PHP to send a group of element values as an array. – Laurenelaurens

@Rory McCrossan: Ah, MVC does similar, but you get the index value as well in the brackets. – Gwenore

Answer 4

This should do the trick. Try adding single quotes around your input name. Also you can call .size() instead of .length for the same effect.

var count = ($('#form_store_setup input[name='delete[]']:checked').length);

See this document for reference regarding the size() function (http://api.jquery.com/size/)

Frig

Single quotes inside single quotes... busted! :) – Gwenore