Sample code for Aras Innovator to open a classification dialog before opening a new item of that classification.

labs_newitemwithclass_execute.js

const itemType = options.itemType;

// Open up a classification dialog
var param = {
    aras: aras,
    isEditMode: true,
    itemTypeName: itemType.name,
    class_structure: itemType.class_structure,
    dialogType: 'classification',
    selectLeafOnly: true,
    isRootClassSelectForbidden: true,
    resizable: true,
    content: 'ClassStructureDialog.html'
};

ArasModules.MaximazableDialog.show('iframe', param).promise.then(function(value) {
    value = value || "";

    // Create a new Item
    let node = aras.newItem(itemType.name);
    if (node) {
        // Set the chosen classification
        aras.setItemProperty(node, "classification", value);
        aras.itemsCache.addItem(node);
        // Then open a window to display that new item
        aras.uiShowItemEx(node, 'new');
    }
});