<form id="filterForm">
    Filter by Last Name: <input type="text"name="filter">
    <button type="submit">Filter</button>
</form>
<div id="grid"></div>

require([
    "dojo/dom","dojo/on","dojo/store/Memory","dgrid/OnDemandGrid"
],function(dom,on,Memory,OnDemandGrid) {
    varform = dom.byId("filterForm"),store = newMemory({ data: [
            { id: 1,firstName: "Bryan",lastName: "Forbes"},{ id: 2,firstName: "Kenneth",lastName: "Franqueiro"},{ id: 3,firstName: "Colin",lastName: "Snover"},{ id: 4,firstName: "Kris",lastName: "Zyp"}
        ] }),grid = newOnDemandGrid({
            columns: {
                "firstName":"First Name","lastName":"Last Name"
            },sort:"lastName",store: store
        },"grid");
     
    on(form,"submit",function(event) {
        varvalue = form.elements.filter.value;
 
        // Filter lastName,matching against the input text
        grid.set("query",{ lastName: value });
 
        // Since we're using a form,prevent normal submission
        event.preventDefault();
    });
});
1
grid.set("query",{ lastName: newRegExp(value,"i") });