Remember (persist) the filter, sort order and current page of jqGrid

My application users asked if it were possible for pages that conta开发者_开发技巧in a jqGrid to remember the filter, sort order and current page of the grid (because when they click a grid item to carry out a task and then go back to it they'd like it to be "as they left it")

Cookies seem to be the way forward, but how to get the page to load these and set them in the grid before it makes its first data request is a little beyond me at this stage.

Does anyone have any experience with this kind of thing with jqGrid? Thanks!

PROBLEM SOLVED

I eventually ended up using cookies in javascript to store the sort column, sort order, page number, grid rows and filter details of the grid (using JSON/Javascript cookies - the prefs object)

Save Preferences - Called from $(window).unload(function(){ ... });

var filters = {
    fromDate: $('#fromDateFilter').val(),
    toDate: $('#toDateFilter').val(),
    customer: $('#customerFilter').val()
};

prefs.data = {
    filter: filters,
    scol: $('#list').jqGrid('getGridParam', 'sortname'),
    sord: $('#list').jqGrid('getGridParam', 'sortorder'),
    page: $('#list').jqGrid('getGridParam', 'page'),
    rows: $('#list').jqGrid('getGridParam', 'rowNum')
};

prefs.save();

Load Preferences - Called from $(document).ready(function(){ ... });

var gridprefs = prefs.load();

$('#fromDateFilter').val(gridprefs.filter.fromDate);
$('#toDateFilter').val(gridprefs.filter.toDate);
$('#customerFilter').val(gridprefs.filter.customer);

$('#list').jqGrid('setGridParam', {
    sortname: gridprefs.scol,
    sortorder: gridprefs.sord,
    page: gridprefs.page,
    rowNum: gridprefs.rows
});

// filterGrid method loads the jqGrid postdata with search criteria and re-requests its data
filterGrid();

jqGrid Reference: http://www.secondpersonplural.ca/jqgriddocs/_2eb0fi5wo.htm

BY POPULAR DEMAND - THE FILTERGRID CODE

    function filterGrid() {
        var fields = "";
        var dateFrom = $('#dateFrom').val();
        var dateTo = $('#dateTo').val();

        if (dateFrom != "") fields += (fields.length == 0 ? "" : ",") + createField("shipmentDate", "ge", dateFrom);
        if (dateTo != "") fields += (fields.length == 0 ? "" : ",") + createField("shipmentDate", "le", dateTo);

        var filters = '"{\"groupOp\":\"AND\",\"rules\":[' + fields + ']}"';

        if (fields.length == 0) {
            $("#list").jqGrid('setGridParam', { search: false, postData: { "filters": ""} }).trigger("reloadGrid");
        } else {
            $("#list").jqGrid('setGridParam', { search: true, postData: { "filters": filters} }).trigger("reloadGrid");
        }

    }

    function createField(name, op, data) {
        var field = '{\"field\":\"' + name + '\",\"op\":\"' + op + '\",\"data\":\"' + data + '\"}';
        return field;
    }

I was working on the same thing but also needed to get and save the column ordering. It's not simple as jqGrid.remapColumns is relative to what ever the current stat of the grid is...

Just in case anyone finds this helpful (and I'd love to know if there is already something to do this that I missed):

(function($){

$.jgrid.extend({

    getColumnOrder : function ()
    {
        var $grid = $(this);

        var colModel = $grid[0].p.colModel;

        var names = [];
        $.each(colModel, function(i,n){
            var name = this.name;
            if (name != "" && name != 'subgrid')
                names[names.length] = name;
        });

        return names;
        //return JSON.stringify(names);
        //$('#dbgout').val(j);

    },


    setColumnOrder : function (new_order)
    {
        var $grid = $(this);

        //var new_order = JSON.parse($('#dbgout').val());
        //new_order = ['a', 'c', 'd', 'b', 'e'];
        //              0    1    2    3    4

        var new_order_index = {};

        $.each(new_order, function(i,n){
            new_order_index[n] = i;
        });

        //new_order = ['a', 'c', 'd', 'b', 'e'];
        //              0    1    2    3    4
        // new_order_index a=>0 c=>1 d=>2 b=>3 e=>4

        var colModel = $grid[0].p.colModel;

        cur = [];
        $.each(colModel, function(i,n){
            var name = this.name;
            if (name != "" && name != 'subgrid')
                cur[cur.length] = name;
        });
        //cur = ['a', 'b', 'c', 'd', 'e'];
        //        0    1    2    3    4

        cur_index = {};
        $.each(cur, function(i,n){
            cur_index[n] = i;
        });


        // remapColumns: The indexes of the permutation array are the current order, the values are the new order.

        // new_order       0=>a 1=>c 2=>d 3=>b 4=>e
        // new_order_index a=>0 c=>1 d=>2 b=>3 e=>4

        // cur             0=>a 1=>b 2=>c 3=>d 4=>e
        // cur_index       a=>0 b=>1 c=>2 d=>3 e=>4

        // permutati       0    2    3    1    4
        //                 a    c    d    b    e
        var perm = [];
        $.each(cur, function(i, name){   // 2=>b

            new_item = new_order[i];     // c goes here
            new_item_index = cur_index[new_item];

            perm[i] = new_item_index;
        });

        if (colModel[0].name == 'subgrid' || colModel[0].name == '')
        {
            perm.splice(0, 0, 0);
            $.each(perm, function(i,n){
                ++perm[i]
            });
            perm[0] = 0;
        }

        $grid.jqGrid("remapColumns", perm, true, false);

    },



});
})(jQuery);

I part of work what you need you can implement with respect of jqGridExport and jqGridImport (see http://www.trirand.com/jqgridwiki/doku.php?id=wiki:import_methods), but it seems to me you want more as exist out of the box in jqGrid. Some additional features you will have to implement yourself.

If the user logs in, you might be able to make AJAX requests back to the server when these parameters change. You could then save the settings, either to database (to make them permanent), to session (to persist them temporarily), or both (for performance reasons).

In any case, with the parameters stored server-side, you could just send them to the page when it is requested.

Hi You can make this easier (no other dependency needed) in Pure Js not a jQuery plugin

var prefs = {

    data: {},

    load: function () {
        var the_cookie = document.cookie.split(';');
        if (the_cookie[0]) {
            this.data = JSON.parse(unescape(the_cookie[0]));
        }
        return this.data;
    },

    save: function (expires, path) {
        var d = expires || new Date(2020, 02, 02);
        var p = path || '/';
        document.cookie = escape( JSON.stringify(this.data) )
                          + ';path=' + p
                          + ';expires=' + d.toUTCString();
    }

}

How to use ?

to_save = { "size": 40, "color": "green", "products":"jeans"};//and any other data/filters you wanna store here

prefs.data = to_save;
prefs.save();//now our json object is saved on the client document cookie


// delete
var date_in_the_past = new Date(2000,02,02);
prefs.save(date_in_the_past);


// read
var what = prefs.load();
// load populates prefs.data and also returns
alert(what.color);
// or ...
alert(prefs.data.color);

PS : All modern browsers support native JSON encoding/decoding (Internet Explorer 8+, Firefox 3.1+, Safari 4+, and Chrome 3+). Basically, JSON.parse(str) read more. PSS : the Object i used there is just optimization and removing the dependency of .toJSONstring ... source

Take a look at these jQuery plugins

USE this don't use the custom funcation above https://github.com/carhartl/jquery-cookie

https://github.com/ScottHamper/Cookies