Disable CheckBox should not be select by select all chkbox

Grid code

columns: grid.Columns(                        
grid.Column(format: @ <input type="checkbox" @(item.Conf_Is_Approved == true ? " disabled='disabled'" : null) value="@item.Conf_ID" name="ids" /> , header: "{checkall}"),
))
<script>    

$(document).ready(function () 
{             
//2nd click event for header checkbox for select /deselect all     
$(document).on("click", "#cbSelectAll", function () {         
var ischecked = this.checked;         //alert(ischecked);  // jQuery 1.7+  
 $('#checkableGrid').find("input:checkbox").each(function () {             
this.checked = ischecked;         
});     });   });
     

$("#checkableGrid th").each(function () 

{            

 if ($.trim($(this).text().toString().toLowerCase()) === "{checkall}")

 {                

 $(this).text('');          

$("", { type: "checkbox", id: "cbSelectAll", value: "" }).appendTo($(this)); 

$(this).append("  All");             

}         

});         //3rd click event for checkbox of each row         

$("input[name='ids']").click(function () {             //alert('hi');   

var totalRows = $("#checkableGrid td :checkbox").length;            

 var checked = $("#checkableGrid td :checkbox:checked").length;    

  if (checked == totalRows) {                 

$("#checkableGrid").find("input:checkbox").each(function () {   

 this.checked = true;                

 });                             

}             

else {                 

$("#cbSelectAll").removeAttr("checked");            

 }        

 });     

script>