JS logic - adding 2 multiselect checkboxes


Just need help with a little JS logic as I'm pretty new to it. I have 2 seperate multiselect dropdown checkbox list user can select from. As of now they can choose no more than 5 from each. How could I set it up where it adds boths drop downs to only allow 5 TOTAL for both.

<select id="dropdown1" multiple="multiple" class="multiselect"> <select id="dropdown2" multiple="multiple" class="multiselect">


$(document).ready(function() { $(".multiselect").multiselect({ header: "Choose up to 5 areas", click: function(event,ui){ if( $(this).multiselect("widget").find("input:checked").length > 5 ){ return false; }}, selectedList:5 });

I'm assuming I would use the id's instead of just the ".multiselect" class then add them. Something like #dropdown1+#dropdown2 > 5 in the if statement. I just simply don't know proper syntax to go about it someone could help me out.

If your not familiar with the jQuery widget I'm using:<a href="http://www.erichynds.com/blog/jquery-ui-multiselect-widget" rel="nofollow">http://www.erichynds.com/blog/jquery-ui-multiselect-widget</a>

per request user689

$(document).ready(function() { $(".multiselect").multiselect({ header: "Choose up to 5 areas", click: function(event,ui){ if($(".multiselect").multiselect("getChecked").map(function(){ return this.value; }).size() > 5){ return false;}}, selectedList:5 });


You can do this.

You will show a message and also unselect the item when the number is more than 5.

<strong>Javascript using Jquery</strong>

$(".multiselect option").click(function(){ if($(".multiselect").children(":checked").length > 5){ if($(this).is(":checked")){ $(this).removeAttr("selected"); alert("You can select only 5 items"); } } } );


The syntax for using a method is:


As an example, to get an array of all clicked checkboxes:

var array_of_checked_values = $(".multiselect").multiselect("getChecked").map(function(){ return this.value; }).get();

In your case, you just want to get the number of checked boxes, i.e the length of the array:

if($(".multiselect").multiselect("getChecked").map(function(){ return this.value; }).size() > 5){ return false;}

The method you are using will access each checkbox on its own, and that would complicate things.


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