Aprile get products information from category page

(function() {
    function updateSlideContent(sourceSlide, index) {
        var productLink = sourceSlide.querySelector('a');
        var productImage = sourceSlide.querySelector('.image img');
        var productTitle = sourceSlide.querySelector('.description');
        var productOldPrice = sourceSlide.querySelector('.oldprice');
        var productPrice = sourceSlide.querySelector('.saleprice');

        if (!productLink) {
            console.log('index - ', index);
            console.log('productLink not exit');
        }
        if (!productImage) {
            console.log('index - ', index);
            console.log('productImage not exit');
        }
        if(!productTitle) {
            console.log('index - ', index);
            console.log('productTitle not exit');
        }
        if(!productOldPrice) {
            console.log('index - ', index);
            console.log('productOldPrice not exit');
        }
        if (!productPrice) {
            console.log('index - ', index);
            console.log('productPrice not exit');
        }
        var productData = {
            productLink: productLink.href,
            productImage: window.location.origin + '/' + productImage.getAttribute('src'),
            productTitle: productTitle.textContent,
            productOldPrice: productOldPrice.textContent,
            productPrice: productPrice.textContent
        };
        products.push(productData);
    }

    var products = [];
    var pageProducts = document.querySelectorAll('.item');
    for(var i = 0; i < pageProducts.length; i++) {
        updateSlideContent(pageProducts[i], i);
    }
    products.forEach(element => {
        console.log(JSON.stringify(element));
    });

})();