Function to filter a dgrid/dstore

filterGrid.js

var filterGrid = function(grid, memory, searchTerm) {
	var setToMemory;
	// if the search is empty, "turn off" filter
	if (searchTerm === "") {
		setToMemory = this.memory;
	} else {
		var mainFilter;
		// go though each column, applying the filter for each:
		for (var key in grid.columns) {
			if (grid.columns.hasOwnProperty(key)) {
				var columnName = grid.columns[key].id;
				var filter = new Filter().match(columnName, new RegExp(searchTerm + "+", "i"));
				if (mainFilter) {
					mainFilter = new Filter().or(mainFilter, filter);
				} else {
					mainFilter = filter;
				}
			}
		}
		setToMemory = memory.filter(mainFilter);
	}

	// set the memory that we've computed above in the if/else
	grid.set("collection", setToMemory);
}