javascript - 显示对象数组中的所有值时出现问题

Question

我正在研究使用云代码在 Parse.com 中集成 Stripe 支付，并在我的 Android 应用程序中使用 Back4App。我正在用 JavaScript 编写云代码，但在显示结帐购物车中的所有查询结果时遇到一些问题。

现在，我只是尝试检索每个 cartItem 并打印出其项目名称。但最终，当用户单击“购买”时，我尝试更新数据库中的每个商品数量。

例如:

• 用户 1 拥有购物车商品:商品 A，数量 2，售价 10 美元，商品 B，数量 2，售价 8 美元。

• 用户 2 拥有购物车商品:商品 A，数量 2，价格 10 美元。

• 在 parse.com 数据库中，显示商品 A 的订单总数为 4，商品 B 的订单总数为 2。

我已经在 parse.com 中创建了数据库，并为我的应用程序编写了 Java 代码，但我无法理解如何编写云代码并循环访问每个购物车项目。

如果代码有问题，我很抱歉。我几乎是在自学如何编程，而 javascript 对我来说是全新的。如果您能指出我正确的方向，我相信我会解决剩下的问题。谢谢。

现在，在 user1 的购物车中，我有 cartItems[牛排、 curry ]。但是当我运行云代码时，它只显示 curry 而不显示牛排。我希望它显示购物车中的所有商品

我的设置方式是 CartActivity.java 中的一个按钮将数据发送到 paymentActivity.java。在 paymentActivity.java 内部是我处理云代码的地方。

CartActivity.java

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;

import java.util.ArrayList;

public class CartActivity extends AppCompatActivity {

    ArrayList<String> myCartItems;
    ArrayList<String> myCartItemQuantity;
    ArrayList<String> myCartItemPrice;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_cart);

        displayCart();

    }

    private void displayCart() {
        // recieving data from MainActivity.class
        myCartItems = getIntent().getExtras().getStringArrayList("cartItems");
         myCartItemQuantity = getIntent().getExtras().getStringArrayList("itemQuantities");
        myCartItemPrice = getIntent().getExtras().getStringArrayList("itemPrices");

        Log.i("myCart ", "items: " + String.valueOf(myCartItems) + "\n" +
                "itemPrices: " + String.valueOf(myCartItemPrice) + "\n" +
                "itemQuantity: " + String.valueOf(myCartItemQuantity));

        LinearLayout linearLayoutVert = findViewById(R.id.linearLayout);
        for (int i = 0; i < myCartItems.size(); i++) {
            LinearLayout linearLayoutHor = new LinearLayout(getApplicationContext());
            linearLayoutHor.setOrientation(LinearLayout.HORIZONTAL);
            linearLayoutVert.addView(linearLayoutHor);

            TextView itemQuantity = new TextView(getApplicationContext());
            TextView item = new TextView(getApplicationContext());
            TextView itemPrice = new TextView(getApplicationContext());

            linearLayoutHor.addView(itemQuantity);
            linearLayoutHor.addView(item);
            linearLayoutHor.addView(itemPrice);

            itemQuantity.setText(myCartItemQuantity.get(i));
            item.setText(myCartItems.get(i));
            itemPrice.setText(myCartItemPrice.get(i));

            //ImageView Setup
            ImageView imageView = new ImageView(this);
            imageView.setImageResource(R.drawable.ic_trash);
            linearLayoutHor.addView(imageView);

        }
    }



public void toPaymentGateway(View view) {
        Intent paymentIntent = new Intent(getApplicationContext(), paymentActivity.class);
        paymentIntent.putExtra("cartItems", myCartItems);
        paymentIntent.putExtra("cartItemPrice", myCartItemPrice);
        paymentIntent.putExtra("cartItemQuantity", myCartItemQuantity);
        startActivity(paymentIntent);
    }

}

paymentActivity.java

package com.example.a1994m.doorstepsdelivery;

import android.app.ProgressDialog;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.parse.FunctionCallback;
import com.parse.Parse;
import com.parse.ParseCloud;
import com.parse.ParseException;
import com.parse.ParseUser;
import com.stripe.android.Stripe;
import com.stripe.android.TokenCallback;
import com.stripe.android.model.Card;
import com.stripe.android.model.Token;

import java.util.ArrayList;
import java.util.HashMap;

import static com.example.a1994m.doorstepsdelivery.TestStripe.BACK4PAPP_API;
import static com.example.a1994m.doorstepsdelivery.TestStripe.CLIENT_KEY;

public class paymentActivity extends AppCompatActivity {

    ArrayList<String> myCartItems;
    ArrayList<String> myCartItemQuantity;
    ArrayList<String> myCartItemPrice ;
    ParseUser currentUser = ParseUser.getCurrentUser();

    public static final String PUBLISHABLE_KEY = "_________";
    public static final String APPLICATION_ID = "____________";
    public static final String CLIENT_KEY = "_____________";
    public static final String BACK4PAPP_API = "https://parseapi.back4app.com/";
    private Card card;
    private ProgressDialog progress;
    private Button purchase;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_payment);

        // Connect to Your Back4app Account
        Parse.initialize(new Parse.Configuration.Builder(this)
                .applicationId(APPLICATION_ID)
                .clientKey(CLIENT_KEY)
                .server(BACK4PAPP_API).build());
        Parse.setLogLevel(Parse.LOG_LEVEL_VERBOSE);

//         Create a demo test credit Card
//         You can pass the payment form data to create a Real Credit card
//         But you need to implement youself.

        card = new Card(
                "344776435490016", //card number
                05, //expMonth
                2021,//expYear
                "216"//cvc
        );
        progress = new ProgressDialog(this);
        purchase = (Button) findViewById(R.id.purchase);
        purchase.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
//                buy();
                charge();
                Log.i("redirecting...", "BUTTON HAS BEEN CLICKED");
            }
        });

        // recieving data from CartActivity.class
         myCartItems = getIntent().getExtras().getStringArrayList("cartItems");
         myCartItemQuantity = getIntent().getExtras().getStringArrayList("cartItemQuantity");
         myCartItemPrice = getIntent().getExtras().getStringArrayList("cartItemPrice");

        Log.i("PaymentGateItems ", "items: " + String.valueOf(myCartItems) + "\n" +
                "itemPrices: " + String.valueOf(myCartItemPrice) + "\n" +
                "itemQuantity: " + String.valueOf(myCartItemQuantity));
    }

//    public void placeOrder(View view){
//
//        Intent stripeIntent = new Intent(getApplicationContext(), TestStripe.class);
//        startActivity(stripeIntent);
//    }

//    private void buy(){
//        boolean validation = card.validateCard();
//        if(validation){
//            startProgress("Validating Credit Card");
//            new Stripe(this).createToken(
//                    card,
//                    PUBLISHABLE_KEY,
//                    new TokenCallback() {
//                        @Override
//                        public void onError(Exception error) {
//                            Log.d("Stripe",error.toString());
//                        }
//
//                        @Override
//                        public void onSuccess(Token token) {
//                            finishProgress();
//                            charge(token);
//                        }
//                    });
//        } else if (!card.validateNumber()) {
//            Log.d("Stripe","The card number that you entered is invalid");
//        } else if (!card.validateExpiryDate()) {
//            Log.d("Stripe","The expiration date that you entered is invalid");
//        } else if (!card.validateCVC()) {
//            Log.d("Stripe","The CVC code that you entered is invalid");
//        } else {
//            Log.d("Stripe","The card details that you entered are invalid");
//        }
//    }

//    private void charge(Token cardToken){
//        HashMap<String, Object> params = new HashMap<String, Object>();
//
//        Log.i("items: ", String.valueOf(myCartItems));
//
//        params.put("quantity", myCartItemQuantity);
//        params.put("price", myCartItemPrice);
//        params.put("ItemName", myCartItems);
////        params.put("ItemName", "Pancake");
//        params.put("cardToken", cardToken.getId());
//        params.put("name",currentUser.getUsername());
////        params.put("name","Dominic Wong");
//        params.put("email",currentUser.getEmail());
////        params.put("email","dominwong4@gmail.com");
//        params.put("address","HIHI"); // needs input from billing address on card
//        params.put("zip","99999"); // needs input from billing address on card
//        params.put("city_state","CA"); // needs input from billing addresss on card
//        startProgress("Purchasing Item");
//        ParseCloud.callFunctionInBackground("purchaseItem", params, new FunctionCallback<Object>() {
//            public void done(Object response, ParseException e) {
//                finishProgress();
//                if (e == null) {
//                    Log.d("Cloud Response", "There were no exceptions! " + response.toString());
//                    Toast.makeText(getApplicationContext(),
//                            "Item Purchased Successfully ",
//                            Toast.LENGTH_LONG).show();
//                } else {
//                    Log.d("Cloud Response", "Exception: " + e);
//                    Toast.makeText(getApplicationContext(),
//                            e.getMessage().toString(),
//                            Toast.LENGTH_LONG).show();
//                }
//            }
//        });
//    }

    private void charge(){
        HashMap<String, Object> params = new HashMap<String, Object>();

        Log.i("items: ", String.valueOf(myCartItems));

        params.put("quantity", myCartItemQuantity);
        params.put("price", myCartItemPrice);
        params.put("ItemName", myCartItems);
//        params.put("ItemName", "Pancake");
//        params.put("cardToken", cardToken.getId());
        params.put("name",currentUser.getUsername());
//        params.put("name","Dominic Wong");
        params.put("email",currentUser.getEmail());
//        params.put("email","dominwong4@gmail.com");
        params.put("address","HIHI"); // needs input from billing address on card
        params.put("zip","99999"); // needs input from billing address on card
        params.put("city_state","CA"); // needs input from billing addresss on card
        startProgress("Purchasing Item");
        ParseCloud.callFunctionInBackground("purchaseItem", params, new FunctionCallback<Object>() {
            public void done(Object response, ParseException e) {
                finishProgress();
                if (e == null) {
                    Log.d("Cloud Response", "There were no exceptions! " + response.toString());
                    Toast.makeText(getApplicationContext(),
                            "Item Purchased Successfully ",
                            Toast.LENGTH_LONG).show();
                } else {
                    Log.d("Cloud Response", "Exception: " + e);
                    Toast.makeText(getApplicationContext(),
                            e.getMessage().toString(),
                            Toast.LENGTH_LONG).show();
                }
            }
        });
    }

    private void startProgress(String title){
        progress.setTitle(title);
        progress.setMessage("Please Wait");
        progress.show();
    }

    private void finishProgress(){
        progress.dismiss();
    }
}

云代码:

var Stripe = require("stripe")("sk_test_rU8GCiz0tkNB02ZbcsXP3b2a");
Parse.Cloud.define("purchaseItem", function (request, response) {
    var item, order;
    var total = 0;

    var CartItems = request.params.ItemName;
    var CartPrice = request.params.price;
    var CartItemQuantity = request.params.quantity;

    var cartQuery = new Parse.Query('Item');

    for(var i=0; i<CartItems.length; i++){

        cartQuery.equalTo('ItemName', CartItems[i]);

        cartQuery.find()
            .then(function (results) {
                for (var result of results) {
                    response.success("got the items " + 
                    result.get("ItemName"));
                }
            })
            .catch(function (error) {
                response.error("could not get the items " + error);
            });
    }
});

Answer 1

您应该只调用 response.success 一次。后续调用将被忽略。你可以尝试这样的事情。

cartQuery.find()
        .then(function (results) {
            var items = [];
            for (var result of results) {
                items.push(result.get("ItemName"));

            }
            response.success(JSON.stringify(items));
        })
        .catch(function (error) {
            response.error("could not get the items " + error);
        });

这将以数组形式响应项目。例如[“牛排”，“ curry ”]然后您应该在客户端处理这个问题。例如使用 JSONArray