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Limit the number of checkboxes that can be selected

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I have a checkbox with 8 options but I need to restrict the number that can be selected to 4.

Any ideas as to how I do this please?

Many thanks

Barbara

You will have to use javascript. I used the codes below in a previous site. 

// Change 2 to your limit
// Chagne 927 to the ID of the checkbox

jQuery(document).ready(function($) {
var limit = 2;
$('input[name="item_meta[927][]"]'fills).change(function() { var checkbox_num =
$("input[name='item_meta[927][]']:checked").length; if ( checkbox_num > limit )  { this.checked = false; } }); });

Thank you for trying to help Albert. Where would I paste the code? I've tried lots of places but cannot get it to work.

Discussion closed.