Required library edition:
Required library file: dhtmlxlayout.js

iterator, calls a user-defined function n-times

• handler - user-defined function, passed cell's object as an argument

    dhxLayout.forEachItem(function(item){
        // do action with item, for example
        item.hideHeader();
    });
    // or
    function doWithItem(item) {
        item.hideHeader();
    }
    dhxLayout.forEachItem(doWithItem);