Question

In continue of this topic I want to save expanded nodes in cookie. Is it the best way?

I’m not sure in way of JSON data checking.

Why expandRow doesn’t work?

var gridId = "#table";
var grid = $(gridId);
grid.jqGrid({

...

loadComplete: function() {
var ids = grid.jqGrid('getDataIDs');

var cookie = $.cookie(gridId + '_expanded');
var expanded = false;

if (typeof(cookie) == 'string')
var expanded = JSON.parse(cookie);

for (var i=0;i<ids.length;i++) {
var id=ids[i];
var row_data = $(this).jqGrid('getRowData', id);

if (expanded && id in expanded && expanded[id] == 'true')
$(gridId + ' tr#' + id + ' div.treeclick').trigger("click");
//Why it doesn't work?
//grid.jqGrid('expandRow', row_data);

}
}

...

});

function setCookie() {
            var ids = grid.jqGrid('getDataIDs');

            var expanded = Object();
            var string = '';

            for (var i=0;i<ids.length;i++) {    
                var id=ids[i];
                var rowData = grid.jqGrid('getRowData', id);                

                if (rowData.parent != '' && grid.jqGrid('isVisibleNode', rowData) === true)
                    expanded[rowData.parent] = true
            }

            for (e in expanded) 
                string += '"' + e + '":' + '"' + expanded[e] + '",';

            $.cookie(gridId + '_expanded', '{'+ string.substring(0, string.length - 1) + '}', { expires: 365 });    
}

var orgExpandNode = $.fn.jqGrid.expandNode, orgCollapseNode = $.fn.jqGrid.collapseNode;

        $.jgrid.extend({
            expandNode : function(rc) {
                orgExpandNode.call(this, rc);
                setCookie();            
            },
            collapseNode : function(rc) {
                orgCollapseNode.call(this, rc);
                setCookie();                        
            },
});

P.S. I allways get this stupid alert 🙂

Your post does not have much context to explain the code sections; please explain your scenario more clearly.

Answer 1

I recommend you to use localStorage instead of cookies. I describe the reason in the answer. I made the demo base on the demos from the answer and another one. For the demo I used the test data from one more my recent answer.

Try to expand in the demo some tree nodes and reload the grid with F5. You will see that all expanded rows stay expanded after the reloading.

The code of the demo you will find below:

var $grid = $('#treegridCompanies'),
    saveObjectInLocalStorage = function (storageItemName, object) {
        if (typeof window.localStorage !== 'undefined') {
            window.localStorage.setItem(storageItemName, JSON.stringify(object));
        }
    },
    removeObjectFromLocalStorage = function (storageItemName) {
        if (typeof window.localStorage !== 'undefined') {
            window.localStorage.removeItem(storageItemName);
        }
    },
    getObjectFromLocalStorage = function (storageItemName) {
        if (typeof window.localStorage !== 'undefined') {
            return JSON.parse(window.localStorage.getItem(storageItemName));
        }
    },
    myColumnStateName = function (grid) {
        return window.location.pathname + '#' + grid[0].id;
    },
    idsOfExpandedRows = [],
    updateIdsOfExpandedRows = function (id, isExpanded) {
        var index = $.inArray(id, idsOfExpandedRows);
        if (!isExpanded && index >= 0) {
            idsOfExpandedRows.splice(index, 1); // remove id from the list
        } else if (index < 0) {
            idsOfExpandedRows.push(id);
        }
        saveObjectInLocalStorage(myColumnStateName($grid), idsOfExpandedRows);
    },
    orgExpandRow = $.fn.jqGrid.expandRow,
    orgCollapseRow = $.fn.jqGrid.collapseRow;

idsOfExpandedRows = getObjectFromLocalStorage(myColumnStateName($grid)) || [];

$grid.jqGrid({
    url: 'SPATEN-TreeGrid2.json',
    datatype: 'json',
    ajaxGridOptions: { contentType: "application/json" },
    jsonReader: {
        id: "CompanyId",
        cell: "",
        root: function (obj) { return obj.rows; },
        page: function () { return 1; },
        total: function () { return 1; },
        records: function (obj) { return obj.rows.length; },
        repeatitems: true
    },
    beforeProcessing: function (data) {
        var rows = data.rows, i, l = rows.length, row, index;
        for (i = 0; i < l; i++) {
            row = rows[i];
            index = $.inArray(row[0], idsOfExpandedRows);
            row[5] = index >= 0; // set expanded column
            row[6] = true;       // set loaded column
        }
    },
    colNames:  ['CompanyId', 'Company'],
    colModel: [
        { name: 'CompanyId', index: 'CompanyId', width: 1, hidden: true, key: true },
        { name: 'Company', index: 'Company', width: 500 }
    ],
    height: 'auto',
    pager: '#pager',
    rowNum: 10000,
    sortable: false,
    treeGrid: true,
    treeGridModel: 'adjacency',
    ExpandColumn: 'Company'
});
$grid.jqGrid('navGrid', '#pager', {edit: false, add: false, del: false, search: false});
$grid.jqGrid('navButtonAdd', '#pager', {
    caption: "",
    buttonicon: "ui-icon-closethick",
    title: "Clear saved grid's settings",
    onClickButton: function () {
        removeObjectFromLocalStorage(myColumnStateName($(this)));
        window.location.reload();
    }
});
$.jgrid.extend({
    expandRow: function (rc) {
        //alert('before expandNode: rowid="' + rc._id_ + '", name="' + rc.name + '"');
        updateIdsOfExpandedRows(rc._id_, true);
        return orgExpandRow.call(this, rc);
    },
    collapseRow: function (rc) {
        //alert('before collapseNode: rowid="' + rc._id_ + '", name="' + rc.name + '"');
        updateIdsOfExpandedRows(rc._id_, false);
        return orgCollapseRow.call(this, rc);
    }
});