check box array selector for jQuery validation

Question

My HTMl:

<input type="checkbox" name="subjects[0]" class="checkbox_array" value="1"  />
<input type="checkbox" name="subjects[1]" class="checkbox_array"  value="1"  />
<input type="checkbox" name="subjects[2]" class="checkbox_array" value="1"  />
<input type="checkbox" name="subjects[3]" class="checkbox_array" value="1"  />
<input type="button" id="ss" />

jquery:

$("#ss").click(function(){
    if($('input[name=subjects\\[\\]]:checked').length<=0)
    {
        alert("No radio checked")
    }
});

its not working for me... using class if($('.checkbox_array:checked').length<=0) it work that easy but how can i do with input name selector

I think you can/should remove the number from inside the array brackets -- name="subjects[]" -- if you're using PHP server-side, it will build an array for you automatically. — Blazemonger
– Blazemonger, Commented Oct 24, 2013 at 13:17
Why do you not want to use the class selector? It's more semantic, and probably quicker. — Rory McCrossan
– Rory McCrossan, Commented Oct 24, 2013 at 13:18
have some many array like this, for code simply used name because if we use class we need to give for all @RoryMcCrossan — Dhamu
– Dhamu, Commented Oct 24, 2013 at 13:24
You could surround them in a container, then the class selector would work for all instances, rather than having to change the 'name starts with' selector for every group. — Rory McCrossan
– Rory McCrossan, Commented Oct 24, 2013 at 13:25
this is a cms project so if any others edits without coding knowledge they will get confuse so i used numbers, so they can know the groups and also they won't miss the name @Blazemonger — Dhamu
– Dhamu, Commented Oct 24, 2013 at 13:26

Dhamu · Accepted Answer · 2013-10-24 13:24:14Z

6

($('input[name*="subjects"]:checked').length<=0)

Will work...

Doc: http://api.jquery.com/attribute-contains-selector/

edited Oct 24, 2013 at 13:24

Dhamu

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answered Oct 24, 2013 at 13:16

Marikkani Chelladurai

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palaѕн · Accepted Answer · 2013-10-24 13:16:27Z

5

You can do this using the Attribute Starts With Selector:

$("#ss").click(function () {
    if ($('input[name^=subjects]:checked').length <= 0) {
        alert("No radio checked")
    }
});

Demo: Fiddle

answered Oct 24, 2013 at 13:16

palaѕн

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