window.onload = function() {
var grid_element = document.getElementsByClassName(‘product-grid-view’);
for (var i = 0; i < grid_element.length; ++i) {
var element = grid_element[i];
element.classList.add('product-list-view');
}
var grid_element = document.getElementsByClassName('product-list-view');
for (var i = 0; i < grid_element.length; ++i) {
var element = grid_element[i];
element.classList.remove('product-grid-view');
}
}