在$ .each中循环和计数JSON数组中的对象

Question

尝试填充$ .each循环中的文本字段，我可以从JSAON数组中获取单独的对象，但是首先要获取所有对象的计数并在$ .each中创建循环是具有挑战性的：请参见JSFiddle第253行。 / p>

console.log向invoice容器显示JSON，但只需要为循环计数。我可以从第260行的过滤器中获得计数，但是.each不能与for循环一起使用。

https://jsfiddle.net/jeffbarclay/2r3unLsc/

$('.add-invoice').on('click', function () {
    $("#invoice_div").css("display", "block");
    $.ajax({
        url: '/echo/json/',
        type: 'POST',
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',
        data: { json: JSON.stringify(myjson) },
        success: function (data) {

            var result = [];
            $.each(data, function (i, e) {
                var matchingItems = $.grep(result, function (item) {
                    return item.customer === e.customer && item.cust_id === e.cust_id;
                });

                if (matchingItems.length === 0) {
                    result.push(e);
                }
            });

            populateSelectBoxes($('#invoice_div #ddinvoice'), result);

            function populateSelectBoxes($select, result) {
                var invoices = [];

                $.each(result, function () {
                    invoices.push('<li data-value="' + this.cust_id + '">' + this.customer + ' : ' + this.invoice + '</li>');
                });
                $select.append(invoices.join(''));
            }

            function populateTableRow(data, selectedProductAutonum) {
                var invoices;
                //var cp = 0;
                //var customerProducts;
                $.each(data, function (i, e) {
                    if (this.cust_id == selectedProductAutonum) {
                        invoices = this;
                        custProducts = data.filter(({ cust_id }) => cust_id === selectedProductAutonum);
                        //alert(JSON.stringify(invoices));
                        //console.log("custProducts.length:  = "+ custProducts.length + "\n" + "custProducts string: "+ JSON.stringify(custProducts));
                        //console.log("cust_id is: " + this.cust_id);
                        //console.log("invoices = " + JSON.stringify(invoices));

                        $.each(invoices, function (i, ee) {
                            console.log(ee);
                            console.log("new invoice loop: " + JSON.stringify(invoices));

                            $(".item-row:last").after(
                                '<tr class="item-row"><td class="item-name"><div class="delete-wpr"><textarea form ="testinsert" name="item_name[cp]">Item Name</textarea><a class="delete" href="javascript:;" title="Remove row">X</a><a class="add-product" href="javascript:;" title="Add Product">A</a></div></td><td class="description"><textarea form ="testinsert" name="item_desc[cp]">Description</textarea></td><td><textarea class="cost" form ="testinsert" name="item_cost[cp]">$0</textarea></td><td><textarea class="qty" form ="testinsert" name="item_qty[cp]">0</textarea></td><td><span class="price" form ="testinsert" name="item_price[cp]">$0</span></td></tr>');
                            if ($(".delete").length > 0) $(".delete").show();
                            bind();

                            $('#address-title').val(invoices.customer);
                            $('#address-one').val(invoices.address);
                            $('#invoice_num').val(invoices.invoice);
                            $('#paid').val(invoices.paid);
                            $('#owed').val(invoices.sales);
                            $('#auto_num').val(invoices.autonum);
                            $('[name="item_name[cp]"]').val(invoices.product);
                            $('[name="item_desc[cp]"]').val(invoices.description);
                            $('[name="item_cost[cp]"]').val(invoices.cost);
                            $('[name="item_qty[cp]"]').val(invoices.quantity);
                            $('[name="item_price[cp]"]').val(invoices.price);
                        });
                    }
                });

                //alert(invoices.invoice + '\n'+ invoices.customer + '\n'+ invoices.name + '\n'+invoices.product + '\n'+ invoices.description + '\n'+ invoices.cost + '\n'+ invoices.quantity + '\n'+ invoices.price);