SchemaOrgParser.js

// originaly from https://kb.apify.com/tips-and-tricks/scraping-data-from-websites-using-schemaorg-microdata
function schemaOrgParser() {    
    var extractValue = function(elem) {
        return $(elem).attr("content") || $(elem).text()
               || $(elem).attr("src") || $(elem).attr("href") || null;
    };
    var addProperty = function(item,propName,value) {
        if( typeof(value)==='string' )
            value = value.trim();
        if( Array.isArray(item[propName]) )
            item[propName].push(value);
        else if( typeof(item[propName])!=='undefined' )
            item[propName] = [item[propName], value];
        else
            item[propName] = value;
    }
    var extractItem = function(elem) {
        var item = { _type: $(elem).attr("itemtype") };
        var count = 0;
        // iterate itemprops not nested in another itemscope    
        $(elem).find("[itemprop]").filter(function() {
            return $(this).parentsUntil(elem, '[itemscope]').length === 0;
        }).each( function() {
            addProperty(
                item,
                $(this).attr("itemprop"),
                $(this).is("[itemscope]") ? extractItem(this) : extractValue(this));
            count++;
        });
        // special case - output at least something
        if( count===0 )
            addProperty(item, "_value", extractValue(elem));
        return item;
    };
    var extractAllItems = function() {
        var items = [];
        // find top-level itemscope elements
        $("[itemscope]").filter(function() {
            return $(this).parentsUntil("body", '[itemscope]').length === 0;
        }).each( function() {
            items.push( extractItem(this) );
        });
        return items;
    };    
    return extractAllItems();
}