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How to check Checkbox with Jquery
for(var i = 0, len = data.UserDetail.RoleNames.length; i < len; ++i) {
    var rolevalue = data.UserDetail.RoleNames[i];
    //alert(rolevalue)

    $('input[value = rolevalue]').attr('checked', true); // I am getting a exception in this line !! :(
}

<input type="checkbox" name="role" value="Admin1" />Admin1<br />
<input type="checkbox" name="role" value="Admin2" />Admin2<br />
<input type="checkbox" name="role" value="Admin3" />Admin3<br />

<input type="checkbox" name="role" value="Admin4" />Admin4<br />