jQuery Grid Plugin - jqGrid

Hello,

My button search doesn't work very well. when I enter parameter for selection, It returns me all my grid and it doesn't care about my query?

Do you any idea about this problem. Below it's my program:

jQuery(document).ready(function(){
    var lastsel;
    jQuery("#client").jqGrid({
           url:'/paiement/traitement/server.php?nd='+new Date().getTime(),
        datatype: "json",
           colNames:['Inv No','Date', 'Client', 'Amount','Tax','Total','Notes'],
           colModel:[
               {name:'invid',index:'invid', width:55,sorttype:"int"},
               {name:'invdate',index:'invdate', width:90,editable:true,sorttype:"date",formatter:'date',formatoptions:{newformat: 'd/m/Y'},editrules:{required:true}},
               {name:'name',index:'name', width:100,editable:true,sorttype:"text",editrules:{required:true}},
               {name:'amount',index:'amount', width:80, align:"right",sorttype:"float",editable:true,editrules:{number:true}},
               {name:'tax',index:'tax', width:80, align:"right",sorttype:"float",editable:true,editrules:{number:true}},
               {name:'total',index:'total', width:80,align:"right",sorttype:"float",editable:true,editrules:{number:true}},
               {name:'note',index:'note', width:150, sortable:false,editable:true}
           ],
           rowNum:10,
           rowList:[10,20,30],
           pager: jQuery('#pclient'),
           sortname: 'invid',
           imgpath: '/paiement/jqgrid/themes/coffee/images/',
        viewrecords: true,
        sortorder: "asc",
        caption: "tableau test",      
        onSelectRow: function(invid){
            if(invid && invid!==lastsel){               
                    var ret = jQuery("#client").getRowData(invid);               
                    jQuery('#client').restoreRow(lastsel);                    
                     //jQuery('#client').editRow(invid,true,pickdates,success,'/paiement/traitement/mise_a_jour_bd.php',{'invid':+ret.invid},aftersavefunc,onerrorfunc);
                     jQuery('#client').editRow(invid,true,pickdates,'','/paiement/traitement/mise_a_jour_bd.php',{'invid':+ret.invid},'',onerrorfunc);
                    lastsel=invid;
             }
        },
        editurl: "/paiement/traitement/server.php",
    }).navGrid('#pclient', {refresh:true,add:true,del:true,search:true,edit:true},
            { height:180,width:300}, //edit options
            { height:180, width:300, modal:true, reloadAfterSubmit:true,url:'/paiement/traitement/ajout_bd.php',
                onInitializeForm : function() {
                    jQuery("#invdate").datepicker({
                        dateFormat:"dd/mm/yy",
                        clickInput:true,
                        createButton:true,
                        buttonImage: '/paiement/jqgrid/themes/calendar.gif'
                        //startDate:'2000-01-02'
                    });    // Mark grid's date fields
                }           
            }, // add options
            { height:80,width:300,  reloadAfterSubmit:true, modal:true, url:'/paiement/traitement/suppression_bd.php',
                 beforeSubmit: function() { //réccuperation du code d'identification!
                     var sr = jQuery('#client').getGridParam('selrow');
                    var rowData = jQuery('#client').getRowData(sr);
                    this.delData = {'invid': rowData['invid']};
                    //retarr = {'invid': rowData['invid']};
                    retarr = this.delData;
                    return retarr;
                   }
            }, // delete options
            {} // search options
    );   

});

Thank you for your help!

Aurore