jqgrid filterToolbar not working

Well i am banging my head against the wall with this one because i have used jqgrid in many apps and similar code is working in every other case but this! Here is the code...

var pfct = $("#pfc_table");
pfct.jqGrid({
        url: 'costs',
        datatype: 'json',
        'postData': JSON.stringify(getConds()),
        mtype: 'POST',
        colNames:['Id','Name','Formula','Conditions'],
        colModel :[
          {name:'id', inde开发者_运维百科x:'id', width:40, search:true},
          {name:'name', index:'name', width:130, search:true},
          {
              name:'formula', index:'formula',width:310, search:true,
              formatter : function(value, options, rData){
                  return value.substring(value.indexOf('=')+1);
              }
          },
          {name:'conditionstr', index:'conditionstr', width:160,search:true}
        ],
        jsonReader: {
            repeatitems:false,
            root: function (r) { return r.data.rows; },
            page: function (r) { return r.data.currpage; },
            total: function (r) { return r.data.totalpages; },
            records: function (r) { return r.data.totalrecords; }
        },
        gridComplete: function() {
        },
        gridview: true,
        height: 'auto',
        autowidth: true,
        pager: '#pfc_pager',
        rowNum:25,
        viewrecords: true,
        loadonce: true,
        ignoreCase: true,
        multiselect: false,
        pagination: true
});
pfct.navGrid('#pfc_pager',{edit:false,add:false,del:false,search:false,refresh:false});
pfct.jqGrid('filterToolbar',{stringResult: true,searchOnEnter: false});

The json data i am sending have a few extra properties that are not defined in the colmodel but this has never been a problem in the past. Local sorting and paging works fine, but filtering does not! For the record this is what the data looks like:

{"data":{"totalpages":1,"currpage":1,"totalrecords":10,"rows":[{"name":"Test","id":18195,"level":0,"currency":"EUR","default":true,"formula":"f_18195()=110","ownerId":1,"categoryName":"Test cat","parentId":0,"rebate":0,"portDues":true,"modified":1310036286000,"conditionstr":"Condition 1, Condition 2"}],"userdata":null},"status":true,"responseError":null}

Your original grid has one problem. You use custom formatter for the 'formula' column:

formatter : function(value, options, rData){
    return value.substring(value.indexOf('=')+1);
}

so the data "f_18195()=110" will be displayed as "100". The way works good in case of datatype: 'json' without loadonce: true, but works wrong in case of loadonce: true. The problem is that the data saved locally for the formula column will be "f_18195()=110" and not "100". So during filtering of the data one have to type "f" or "f_18195()=1" instead of "1" to filter the data:

You can fix the problem if you would use jsonmap as function:

jsonmap: function (obj) {
    var f = obj.formula;
    return f.substring(f.indexOf('=')+1);
}

instead of usage of usage of custom formatter for the 'formula' column. In the case the value "100" will be saved locally and the filtering of data works as expected:

See the corresponding demo here.