How can I preserve the search filters in jqGrid on page reload?

Question

I found many discussions that were close to what I need, and this question is the closest - How can I set postData._search to true in the request in jqGrid?.

As I\'

Answer 1

@Oleg Oleg's answer works like a charm but just for the first time.

For me when I reload the grid, filters and search flag are not set up. With the following code each time I reload the grid it also sends the filters and search flag. I use server side sort and pagination.

I'm using:

jQuery("#myGrid").navGrid("#myPager", {search: true, refresh: true, edit: false, 
    add:false, del:false}, {}, {}, {}, {});

On the grid definition:

beforeRequest: function() {
    // filter to be added on each request
    var filterObj1 = {"field":"myField","op":"eq","data":"myValue"}; 
    var grid = jQuery("#myGrid");
    var postdata = grid.jqGrid('getGridParam', 'postData');             
    if(postdata != undefined && postdata.filters != undefined ) {
        postdata.filters = jQuery.jgrid.parse(postdata.filters);
        //Remove if current field exists
        postdata.filters.rules = jQuery.grep(postdata.filters.rules, function(value) {
            if(value.field != 'myField')
                return value;
        });
        // Add new filters
        postdata.filters.rules.push(filterObj1);
    } else {
        jQuery.extend(postdata, {
            filters:  { 
                "groupOp":"AND",
                "rules":[filterObj1] 
            }
        });
        // more filters in the way: postdata.filters.rules.push(filterObj1);
    }
    postdata.filters = JSON.stringify(postdata.filters);
    postdata._search = true;
    return [true,''];
}