JQuery - Set Attribute value

Question

I have following HTML with two elements having the same name

Answer 1

Use an ID to uniquely identify the checkbox. Your current example is trying to select the checkbox with an id of '#chk0':

$('#chk0').attr("disabled", "disabled");

You'll also need to remove the attribute for disabled to enable the checkbox. Something like:

$('#chk0').removeAttr("disabled");

See the docs for removeAttr

The value XHTML for disabling/enabling an input element is as follows:

Note that it's the absence of the disabled attribute that makes the input element enabled.