I have done small code to keep multi-selection between pagination and also during refresh.
$("#searchPhonoList").flexigrid($.extend({}, flexigridAttrs, {
url: './rest/phono/search',
preProcess: formatSearchPhonoResults,
onSuccess: successSearchPhono,
onSubmit: submit,
method: 'GET',
dataType: 'json',
colModel : [
{display: 'titre', name: 'titre_brut', width : 240, sortable : true, align: 'left'},
{display: 'version', name: 'version_brut', width : 60, sortable : true, align: 'left'}
],
height: "auto",
sortname: "score",
sortorder: "desc",
showTableToggleBtn: false,
showToggleBtn: false,
singleSelect: false,
onToggleCol: false,
usepager: true,
title: "Liste des candidats",
resizable: true,
rp:20,
useRp: true
}));
var searchPhonoListSelection = new Array();
$('#searchPhonoList').click(function(event){
$(' tbody tr', this).each( function(){
var id = $(this).attr('id').substr(3);
if ( searchPhonoListSelection.indexOf(id) != -1 ) {
searchPhonoListSelection.splice(searchPhonoListSelection.indexOf(id), 1);
}
});
$('.trSelected', this).each( function(){
var id = $(this).attr('id').substr(3);
if ( searchPhonoListSelection.indexOf(id) == -1 ) {
searchPhonoListSelection.push(id);
}
});
});
function successSearchPhono() {
$("#searchPhonoList tbody tr").each( function() {
var id = $(this).attr('id').substr(3);
if ( searchPhonoListSelection.indexOf(id) != -1 ) {
$(this).addClass("trSelected");
}
});
}