#4 - BUIDL a Swap UI on Solana

Authors: @SaiyanBs, @ironaddicteddog​
[Updated at 2022.3.31]
See the example repo here​
See the demo DApp here​
TL; DR
Use Next.js + React.js + @solana/web3.js
Raydium AMM swap
Jupiter SDK swap
Introduction
What is Solana
Solana is a fast, low cost, decentralized blockchain with thousands of projects spanning DeFi, NFTs, Web3 and more.
What is Raydium
Raydium is an Automated Market Maker (AMM) and liquidity provider built on the Solana blockchain.
What is Jupiter
Jupiter is the key swap aggregator for Solana, offering the best route discovery between any token pair.
Overview
What does web3.js do?
web3.js library
Solana tx
Solana ix
How to find the program interface?
Structure
├── 📂 pages
│   │
│   ├── 📂 api
│   │
│   ├── 📄 _app.tsx
│   │
│   ├── 📄 index.tsx
│   │
│   ├── 📄 jupiter.tsx
│   │
│   └── 📄 raydium.tsx
│
└── 📂 views
│   │
│   ├── 📂 commons
│   │
│   ├── 📂 jupiter
│   │
│   └── 📂 raydium
│
├── 📂 utils
│
├── 📂 styles
│
├── 📂 chakra
│   │
│   └── 📄 style.js
│
├── 📂 public
│
│── 📄 next.config.js
│
└── ...
​
Setup
First, let's start a brand new next.js project:
$ npx [email protected] solmeet-4-swap-ui --typescript
Remove package-lock.json since we will use yarn through this entire tutorial:
$ rm package-lock.json
Install Dependencies
Next, let's install all the dependencies. This includes:
Solana wallet adapter
Solana web3.js
Solana SPL token
Serum
Sass
Jupiter SDK
Next.js config plugins
Chakra (UI lib)
Lodash
Let's update package.json directly:
{
  "name": "solmeet-4-swap-ui",
  "private": true,
  "scripts": {
    "dev": "next dev",
    "build": "next build",
    "start": "next start",
    "lint": "next lint"
  },
  "dependencies": {
    "@chakra-ui/icons": "^1.1.1",
    "@chakra-ui/react": "^1.7.4",
    "@emotion/react": "^11",
    "@emotion/styled": "^11",
    "@jup-ag/react-hook": "^1.0.0-beta.2",
    "@project-serum/borsh": "^0.2.3",
    "@project-serum/serum": "^0.13.61",
    "@solana/spl-token-registry": "^0.2.1733",
    "@solana/wallet-adapter-base": "^0.9.2",
    "@solana/wallet-adapter-react": "^0.15.2",
    "@solana/wallet-adapter-react-ui": "^0.9.4",
    "@solana/wallet-adapter-wallets": "^0.14.2",
    "@solana/web3.js": "^1.32.0",
    "framer-motion": "^5",
    "lodash-es": "^4.17.21",
    "next": "12.0.8",
    "next-compose-plugins": "^2.2.1",
    "next-transpile-modules": "^9.0.0",
    "react": "17.0.2",
    "react-dom": "17.0.2",
    "sass": "^1.49.0"
  },
  "devDependencies": {
    "@types/lodash-es": "^4.17.5",
    "@types/node": "17.0.10",
    "@types/react": "17.0.38",
    "eslint": "8.7.0",
    "eslint-config-next": "12.0.8",
    "typescript": "4.5.5"
  },
  "resolutions": {
    "@solana/buffer-layout": "^3.0.0"
  }
}
Then run the installation:
$ yarn
...
Note: make sure the version of buffer-layout is locked at ^3.0.0
Scaffold
Populates folders and files for later update:
$ mkdir utils && touch utils/{ids.ts,layouts.ts,liquidity.ts,pools.ts,safe-math.ts,swap.ts,tokenList.ts,tokens.ts,web3.ts}
$ mkdir views && mkdir views/{commons,jupiter,raydium}
$ touch views/commons/{Navigator.tsx,WalletProvider.tsx,SplTokenList.tsx,Notify.tsx} && touch views/jupiter/{FeeInfo.tsx,JupiterForm.tsx,JupiterProvider.tsx} && touch views/raydium/{index.tsx,SlippageSetting.tsx,SwapOperateContainer.tsx,TokenList.tsx,TokenSelect.tsx,TitleRow.tsx}
$ touch styles/{swap.module.sass,color.module.sass,navigator.module.sass,jupiter.module.sass}
$ touch pages/{index.tsx,jupiter.tsx,raydium.tsx}
$ mkdir chakra && touch chakra/style.js
Add Common Components
There are 4 common components:
Navigator
Notify
SplTokenList
WalletProvider
Navigator
Add the following code in ./views/commons/Navigator.tsx:
import { FunctionComponent } from "react";
import Link from "next/link";
import {
  WalletModalProvider,
  WalletDisconnectButton,
  WalletMultiButton
} from "@solana/wallet-adapter-react-ui";
import { useWallet } from "@solana/wallet-adapter-react";
import style from "../../styles/navigator.module.sass";
​
const Navigator: FunctionComponent = () => {
  const wallet = useWallet();
  return (
    <div className={style.sidebar}>
      <div className={style.routesBlock}>
        <Link href="/" passHref>
          <a href="https://ibb.co/yP2vCNL">
            <img
              src="https://i.ibb.co/g9Yq8rs/logo-v4-horizontal-transparent.png"
              alt="logo-v4-horizontal-transparent"
              className={style.dappioLogo}
            />
          </a>
        </Link>
        <Link href="/jupiter">
          <a className={style.route}>Jupiter</a>
        </Link>
        <Link href="/raydium">
          <a className={style.route}>Raydium</a>
        </Link>
      </div>
      <WalletModalProvider>
        {wallet.connected ? <WalletDisconnectButton /> : <WalletMultiButton />}
      </WalletModalProvider>
    </div>
  );
};
​
export default Navigator;
Notify
Add the following code in ./views/commons/Notify.tsx:
import { FunctionComponent } from "react";
import {
  Alert,
  AlertIcon,
  AlertTitle,
  AlertDescription,
  AlertStatus
} from "@chakra-ui/react";
import style from "../../styles/swap.module.sass";
​
export interface INotify {
  status: AlertStatus;
  title: string;
  description: string;
  link?: string;
}
interface NotifyProps {
  message: {
    status: AlertStatus;
    title: string;
    description: string;
    link?: string;
  };
}
​
const Notify: FunctionComponent<NotifyProps> = props => {
  return (
    <Alert status={props.message.status} className={style.notifyContainer}>
      <div className={style.notifyTitleRow}>
        <AlertIcon boxSize="2rem" />
        <AlertTitle className={style.title}>{props.message.title}</AlertTitle>
      </div>
      <AlertDescription className={style.notifyDescription}>
        {props.message.description}
      </AlertDescription>
      {props.message.link ? (
        <a
          href={props.message.link}
          style={{ color: "#fbae21", textDecoration: "underline" }}
        >
          Check Explorer
        </a>
      ) : (
        ""
      )}
    </Alert>
  );
};
​
export default Notify;
SplTokenList
Add the following code in ./views/commons/SplTokenList.tsx:
import { FunctionComponent } from "react";
import style from "../../styles/swap.module.sass";
import { TOKENS } from "../../utils/tokens";
import { ISplToken } from "../../utils/web3";
​
interface ISplTokenProps {
  splTokenData: ISplToken[];
}
​
interface SplTokenDisplayData {
  symbol: string;
  mint: string;
  pubkey: string;
  amount: number;
}
​
const SplTokenList: FunctionComponent<ISplTokenProps> = (
  props
): JSX.Element => {
  let tokenList: SplTokenDisplayData[] = [];
  if (props.splTokenData.length === 0) {
    return <></>;
  }
​
  for (const [_, value] of Object.entries(TOKENS)) {
    let spl: ISplToken | undefined = props.splTokenData.find(
      (t: ISplToken) => t.parsedInfo.mint === value.mintAddress
    );
    if (spl) {
      let token = {} as SplTokenDisplayData;
      token["symbol"] = value.symbol;
      token["mint"] = spl?.parsedInfo.mint;
      token["pubkey"] = spl?.pubkey;
      token["amount"] = spl?.amount;
      tokenList.push(token);
    }
  }
​
  let tokens = tokenList.map((item: SplTokenDisplayData) => {
    return (
      <div key={item.mint} className={style.splTokenItem}>
        <div>
          <span style={{ marginRight: "1rem", fontWeight: "600" }}>
            {item.symbol}
          </span>
          <span>- {item.amount}</span>
        </div>
        <div style={{ opacity: ".25" }}>
          <div>Mint: {item.mint}</div>
          <div>Pubkey: {item.pubkey}</div>
        </div>
      </div>
    );
  });
​
  return (
    <div className={style.splTokenContainer}>
      <div className={style.splTokenListTitle}>Your Tokens</div>
      {tokens}
    </div>
  );
};
​
export default SplTokenList;
WalletProvider
Add the following code in ./views/commons/WalletProvider.tsx:
import React, { FunctionComponent, useMemo } from "react";
import {
  ConnectionProvider,
  WalletProvider
} from "@solana/wallet-adapter-react";
import { WalletAdapterNetwork } from "@solana/wallet-adapter-base";
import {
  LedgerWalletAdapter,
  PhantomWalletAdapter,
  SlopeWalletAdapter,
  SolflareWalletAdapter,
  SolletExtensionWalletAdapter,
  SolletWalletAdapter,
  TorusWalletAdapter
} from "@solana/wallet-adapter-wallets";
import { clusterApiUrl } from "@solana/web3.js";
​
// Default styles that can be overridden by your app
require("@solana/wallet-adapter-react-ui/styles.css");
​
export const Wallet: FunctionComponent = props => {
  // // The network can be set to 'devnet', 'testnet', or 'mainnet-beta'.
  const network = WalletAdapterNetwork.Mainnet;
​
  // // You can also provide a custom RPC endpoint.
  const endpoint = "https://rpc-mainnet-fork.dappio.xyz";
​
  // @solana/wallet-adapter-wallets includes all the adapters but supports tree shaking and lazy loading --
  // Only the wallets you configure here will be compiled into your application, and only the dependencies
  // of wallets that your users connect to will be loaded.
  const wallets = useMemo(
    () => [
      new PhantomWalletAdapter(),
      new SlopeWalletAdapter(),
      new SolflareWalletAdapter(),
      new TorusWalletAdapter(),
      new LedgerWalletAdapter(),
      new SolletWalletAdapter({ network }),
      new SolletExtensionWalletAdapter({ network })
    ],
    [network]
  );
​
  return (
    <ConnectionProvider endpoint={endpoint}>
      <WalletProvider wallets={wallets} autoConnect>
        {props.children}
      </WalletProvider>
    </ConnectionProvider>
  );
};
Add Pages for Raydium and Jupiter
Add the following code in ./pages/raydium.tsx:
import { FunctionComponent } from "react";
​
const RaydiumPage: FunctionComponent = () => {
  return <div>This is Raydium Page</div>;
};
​
export default RaydiumPage;
Add the following code in ./pages/jupiter.tsx:
import { FunctionComponent } from "react";
​
const JupiterPage: FunctionComponent = () => {
  return <div>This is Jupiter Page</div>;
};
​
export default JupiterPage;
Update Styles
Theere are 3 style sheets to be updated:
globals.css
navigator.module.sass
color.module.sass
globals.css
Add the following code in ./styles/globals.css:
html,
body {
  font-size: 10px;
  background-color: rgb(19, 27, 51);
  color: #eee
}
​
.wallet-adapter-modal-list-more {
  color: #eee
}
.wallet-adapter-button-trigger {
  background-color: #fbae21 !important;
  color: black !important
}
navigator.module.sass
Add the following code in ./styles/navigator.module.sass:
@import './color.module.sass'
​
.dappioLogo
  flex: 2
  text-align: center
  width: 12rem
  margin-right: 10rem
  cursor: pointer
.sidebar
  display: flex
  align-items: center
  font-size: 2rem
  height: 7rem
  border-bottom: 1px solid rgb(29, 40, 76)
  background-color: $main_blue
  padding: 0 4rem
  justify-content: space-between
  letter-spacing: .1rem
  font-weight: 500
.routesBlock
  display: flex
  align-items: center
  justify-content: space-around
  color: $white
  font-size: 1.5rem
.route
  margin-right: 5rem
color.module.sass
Add the following code in ./styles/color.module.sass:
$white: #eee
$main_blue: rgb(19, 27, 51)
$swap_card_bgc: #131a35
$coin_select_block_bgc: #000829
$placeholder_grey: #f1f1f2
$swap_btn_border_color: #5ac4be
$token_list_bgc: #1c274f
$slippage_setting_warning_red: #f5222d
Update app
Replace pages/_app.tsx with following code:
import "../styles/globals.css";
import type { AppProps } from "next/app";
import { Wallet } from "../views/commons/WalletProvider";
import Navigator from "../views/commons/Navigator";
​
function SwapUI({ Component, pageProps }: AppProps) {
  return (
    <>
      <Wallet>
        <Navigator />
        <Component {...pageProps} />
      </Wallet>
    </>
  );
}
​
export default SwapUI;
Start the dev server. For now you should see jupiter and raydium page with only plain text and one wallet connecting button:
$ yarn dev
Part 1: Build a Swap on Raydium
What we need to implement Raydium swap?
1.Token list
2.Slippage setting
3.Price out
4.Amm pools info
5.Interact with on-chain program
Add Raydium Utils
Let's update each component one by one:
​ids.ts​
​layouts.ts​
​liquidity.ts​
​pools.ts​
​safe-math.ts​
​swap.ts​
​tokenList.ts​
​tokens.ts​
​web3.ts​
Add Components
We will update the following components:
SlippageSetting
SwapOperateContainer
TitleRow
TokenList
TokenSelect
index
TitleRow.tsx
Add the following code in ./views/raydium/TitleRow.tsx:
import style from "../../styles/swap.module.sass";
import {
  Tooltip,
  Popover,
  PopoverTrigger,
  PopoverContent,
  PopoverBody,
  PopoverArrow
} from "@chakra-ui/react";
import { SettingsIcon, InfoOutlineIcon } from "@chakra-ui/icons";
import { useState, useEffect, FunctionComponent } from "react";
import { TokenData, ITokenInfo } from ".";
​
interface ITitleProps {
  toggleSlippageSetting: Function;
  fromData: TokenData;
  toData: TokenData;
  updateSwapOutAmount: Function;
}
​
interface IAddressInfoProps {
  type: string;
}
​
const TitleRow: FunctionComponent<ITitleProps> = (props): JSX.Element => {
  const [second, setSecond] = useState<number>(0);
  const [percentage, setPercentage] = useState<number>(0);
​
  useEffect(() => {
    let id = setInterval(() => {
      setSecond(second + 1);
      setPercentage((second * 100) / 60);
      if (second === 60) {
        setSecond(0);
        props.updateSwapOutAmount();
      }
    }, 1000);
    return () => clearInterval(id);
  });
​
  const AddressInfo: FunctionComponent<IAddressInfoProps> = (
    addressProps
  ): JSX.Element => {
    let fromToData = {} as ITokenInfo;
    if (addressProps.type === "From") {
      fromToData = props.fromData.tokenInfo;
    } else {
      fromToData = props.toData.tokenInfo;
    }
​
    return (
      <>
        <span className={style.symbol}>{fromToData?.symbol}</span>
        <span className={style.address}>
          <span>{fromToData?.mintAddress.substring(0, 14)}</span>
          <span>{fromToData?.mintAddress ? "..." : ""}</span>
          {fromToData?.mintAddress.substr(-14)}
        </span>
      </>
    );
  };
​
  return (
    <div className={style.titleContainer}>
      <div className={style.title}>Swap</div>
      <div className={style.iconContainer}>
        <Tooltip
          hasArrow
          label={`Displayed data will auto-refresh after ${
            60 - second
          } seconds. Click this circle to update manually.`}
          color="white"
          bg="brand.100"
          padding="3"
        >
          <svg
            viewBox="0 0 36 36"
            className={`${style.percentageCircle} ${style.icon}`}
          >
            <path
              className={style.circleBg}
              d="M18 2.0845
              a 15.9155 15.9155 0 0 1 0 31.831
              a 15.9155 15.9155 0 0 1 0 -31.831"
            />
            <path
              d="M18 2.0845
              a 15.9155 15.9155 0 0 1 0 31.831
              a 15.9155 15.9155 0 0 1 0 -31.831"
              fill="none"
              stroke="rgb(20, 120, 227)"
              strokeWidth="3"
              // @ts-ignore
              strokeDasharray={[percentage, 100]}
            />
          </svg>
        </Tooltip>
        <Popover trigger="hover">
          <PopoverTrigger>
            <div className={style.icon}>
              <InfoOutlineIcon w={18} h={18} />
            </div>
          </PopoverTrigger>
          <PopoverContent
            color="white"
            bg="brand.100"
            border="none"
            w="auto"
            className={style.popover}
          >
            <PopoverArrow bg="brand.100" className={style.popover} />
            <PopoverBody>
              <div className={style.selectTokenAddressTitle}>
                Program Addresses (DO NOT DEPOSIT)
              </div>
              <div className={style.selectTokenAddress}>
                {props.fromData.tokenInfo?.symbol ? (
                  <AddressInfo type="From" />
                ) : (
                  ""
                )}
              </div>
              <div className={style.selectTokenAddress}>
                {props.toData.tokenInfo?.symbol ? (
                  <AddressInfo type="To" />
                ) : (
                  ""
                )}
              </div>
            </PopoverBody>
          </PopoverContent>
        </Popover>
        <div
          className={style.icon}
          onClick={() => props.toggleSlippageSetting()}
        >
          <SettingsIcon w={18} h={18} />
        </div>
      </div>
    </div>
  );
};
​
export default TitleRow;
TokenList.tsx
Add the following code in ./views/raydium/TokenList.tsx:
import { FunctionComponent, useEffect, useRef, useState } from "react";
import { CloseIcon } from "@chakra-ui/icons";
import SPLTokenRegistrySource from "../../utils/tokenList";
import { TOKENS } from "../../utils/tokens";
import { ITokenInfo } from ".";
import style from "../../styles/swap.module.sass";
​
interface TokenListProps {
  showTokenList: boolean;
  toggleTokenList: (event?: React.MouseEvent<HTMLDivElement>) => void;
  getTokenInfo: Function;
}
​
const TokenList: FunctionComponent<TokenListProps> = props => {
  const [initialList, setList] = useState<ITokenInfo[]>([]);
  const [searchedList, setSearchList] = useState<ITokenInfo[]>([]);
  const searchRef = useRef<any>();
​
  useEffect(() => {
    SPLTokenRegistrySource().then((res: any) => {
      let list: ITokenInfo[] = [];
      res.map((item: any) => {
        let token = {} as ITokenInfo;
        if (
          TOKENS[item.symbol] &&
          !list.find(
            (t: ITokenInfo) => t.mintAddress === TOKENS[item.symbol].mintAddress
          )
        ) {
          token = TOKENS[item.symbol];
          token["logoURI"] = item.logoURI;
          list.push(token);
        }
      });
      setList(() => list);
      props.getTokenInfo(
        list.find((item: ITokenInfo) => item.symbol === "SOL")
      );
    });
  }, []);
​
  useEffect(() => {
    setSearchList(() => initialList);
  }, [initialList]);
​
  const setTokenInfo = (item: ITokenInfo) => {
    props.getTokenInfo(item);
    props.toggleTokenList();
  };
​
  useEffect(() => {
    if (!props.showTokenList) {
      setSearchList(initialList);
      searchRef.current.value = "";
    }
  }, [props.showTokenList]);
​
  const listItems = (data: ITokenInfo[]) => {
    return data.map((item: ITokenInfo) => {
      return (
        <div
          className={style.tokenRow}
          key={item.mintAddress}
          onClick={() => setTokenInfo(item)}
        >
          <img src={item.logoURI} alt="" className={style.tokenLogo} />
          <div>{item.symbol}</div>
        </div>
      );
    });
  };
​
  const searchToken = (e: any) => {
    let key = e.target.value.toUpperCase();
    let newList: ITokenInfo[] = [];
    initialList.map((item: ITokenInfo) => {
      if (item.symbol.includes(key)) {
        newList.push(item);
      }
    });
    setSearchList(() => newList);
  };
​
  let tokeListComponentStyle;
  if (!props.showTokenList) {
    tokeListComponentStyle = {
      display: "none"
    };
  } else {
    tokeListComponentStyle = {
      display: "block"
    };
  }
​
  return (
    <div className={style.tokeListComponent} style={tokeListComponentStyle}>
      <div className={style.tokeListContainer}>
        <div className={style.header}>
          <div>Select a token</div>
          <div className={style.closeIcon} onClick={props.toggleTokenList}>
            <CloseIcon w={5} h={5} />
          </div>
        </div>
        <div className={style.inputBlock}>
          <input
            type="text"
            placeholder="Search name or mint address"
            ref={searchRef}
            className={style.searchTokenInput}
            onChange={searchToken}
          />
          <div className={style.tokenListTitleRow}>
            <div>Token name</div>
          </div>
        </div>
        <div className={style.list}>{listItems(searchedList)}</div>
        <div className={style.tokenListSetting}>View Token List</div>
      </div>
    </div>
  );
};
​
export default TokenList;
SlippageSetting.tsx
Add the following code in ./views/raydium/SlippageSetting.tsx:
import { useState, useEffect, FunctionComponent } from "react";
import { CloseIcon } from "@chakra-ui/icons";
import style from "../../styles/swap.module.sass";
​
interface SlippageSettingProps {
  showSlippageSetting: boolean;
  toggleSlippageSetting: Function;
  getSlippageValue: Function;
  slippageValue: number;
}
​
const SlippageSetting: FunctionComponent<SlippageSettingProps> = props => {
  const rate = [0.1, 0.5, 1];
  const [warningText, setWarningText] = useState("");
​
  const setSlippageBtn = (item: number) => {
    props.getSlippageValue(item);
  };
​
  useEffect(() => {
    Options();
​
    if (props.slippageValue < 0) {
      setWarningText("Please enter a valid slippage percentage");
    } else if (props.slippageValue < 1) {
      setWarningText("Your transaction may fail");
    } else {
      setWarningText("");
    }
  }, [props.slippageValue]);
​
  const Options = (): JSX.Element => {
    return (
      <>
        {rate.map(item => {
          return (
            <button
              className={`${style.optionBtn} ${
                item === props.slippageValue
                  ? style.selectedSlippageRateBtn
                  : ""
              }`}
              key={item}
              onClick={() => setSlippageBtn(item)}
            >
              {item}%
            </button>
          );
        })}
      </>
    );
  };
​
  const updateInputRate = (e: React.FormEvent<HTMLInputElement>) => {
    props.getSlippageValue(e.currentTarget.value);
  };
​
  const close = () => {
    if (props.slippageValue < 0) {
      return;
    }
    props.toggleSlippageSetting();
  };
​
  if (!props.showSlippageSetting) {
    return null;
  }
​
  return (
    <div className={style.slippageSettingComponent}>
      <div className={style.slippageSettingContainer}>
        <div className={style.header}>
          <div>Setting</div>
          <div className={style.closeIcon} onClick={close}>
            <CloseIcon w={5} h={5} />
          </div>
        </div>
        <div className={style.settingSelectBlock}>
          <div className={style.title}>Slippage tolerance</div>
          <div className={style.optionsBlock}>
            <Options />
            <button className={`${style.optionBtn} ${style.inputBtn}`}>
              <input
                type="number"
                placeholder="0%"
                className={style.input}
                value={props.slippageValue}
                onChange={updateInputRate}
              />
              %
            </button>
          </div>
          <div className={style.warning}>{warningText}</div>
        </div>
      </div>
    </div>
  );
};
​
export default SlippageSetting;
TokenSelect.tsx
Add the following code in ./views/raydium/TokenSelect.tsx:
import { FunctionComponent, useEffect, useState } from "react";
import { ArrowDownIcon } from "@chakra-ui/icons";
import { useWallet } from "@solana/wallet-adapter-react";
import { TokenData } from "./index";
import { ISplToken } from "../../utils/web3";
import style from "../../styles/swap.module.sass";
​
interface TokenSelectProps {
  type: string;
  toggleTokenList: Function;
  tokenData: TokenData;
  updateAmount: Function;
  wallet: Object;
  splTokenData: ISplToken[];
}
​
export interface IUpdateAmountData {
  type: string;
  amount: number;
}
​
interface SelectTokenProps {
  propsData: {
    tokenData: TokenData;
  };
}
​
const TokenSelect: FunctionComponent<TokenSelectProps> = props => {
  let wallet = useWallet();
  const [tokenBalance, setTokenBalance] = useState<number | null>(null);
​
  const updateAmount = (e: any) => {
    e.preventDefault();
​
    const amountData: IUpdateAmountData = {
      amount: e.target.value,
      type: props.type
    };
    props.updateAmount(amountData);
  };
​
  const selectToken = () => {
    props.toggleTokenList(props.type);
  };
​
  useEffect(() => {
    const getTokenBalance = () => {
      let data: ISplToken | undefined = props.splTokenData.find(
        (t: ISplToken) =>
          t.parsedInfo.mint === props.tokenData.tokenInfo?.mintAddress
      );
​
      if (data) {
        //@ts-ignore
        setTokenBalance(data.amount);
      }
    };
    getTokenBalance();
  }, [props.splTokenData]);
​
  const SelectTokenBtn: FunctionComponent<
    SelectTokenProps
  > = selectTokenProps => {
    if (selectTokenProps.propsData.tokenData.tokenInfo?.symbol) {
      return (
        <>
          <img
            src={selectTokenProps.propsData.tokenData.tokenInfo?.logoURI}
            alt="logo"
            className={style.img}
          />
          <div className={style.coinNameBlock}>
            <span className={style.coinName}>
              {selectTokenProps.propsData.tokenData.tokenInfo?.symbol}
            </span>
            <ArrowDownIcon w={5} h={5} />
          </div>
        </>
      );
    }
    return (
      <>
        <span>Select a token</span>
        <ArrowDownIcon w={5} h={5} />
      </>
    );
  };
​
  return (
    <div className={style.coinSelect}>
      <div className={style.noteText}>
        <div>
          {props.type === "To" ? `${props.type} (Estimate)` : props.type}
        </div>
        <div>
          {wallet.connected && tokenBalance
            ? `Balance: ${tokenBalance.toFixed(4)}`
            : ""}
        </div>
      </div>
      <div className={style.coinAmountRow}>
        {props.type !== "From" ? (
          <div className={style.input}>
            {props.tokenData.amount ? props.tokenData.amount : "-"}
          </div>
        ) : (
          <input
            type="number"
            className={style.input}
            placeholder="0.00"
            onChange={updateAmount}
            disabled={props.type !== "From"}
          />
        )}
​
        <div className={style.selectTokenBtn} onClick={selectToken}>
          <SelectTokenBtn propsData={props} />
        </div>
      </div>
    </div>
  );
};
​
export default TokenSelect;
SwapOperateContainer.tsx
Add the following code in ./views/raydium/SwapOperateContainer.tsx:
import { FunctionComponent } from "react";
import { ArrowUpDownIcon, QuestionOutlineIcon } from "@chakra-ui/icons";
import { Tooltip } from "@chakra-ui/react";
import { useWallet } from "@solana/wallet-adapter-react";
import {
  WalletModalProvider,
  WalletMultiButton
} from "@solana/wallet-adapter-react-ui";
import { TokenData } from ".";
import TokenSelect from "./TokenSelect";
import { ISplToken } from "../../utils/web3";
import style from "../../styles/swap.module.sass";
​
interface SwapOperateContainerProps {
  toggleTokenList: Function;
  fromData: TokenData;
  toData: TokenData;
  updateAmount: Function;
  switchFromAndTo: (event?: React.MouseEvent<HTMLDivElement>) => void;
  slippageValue: number;
  sendSwapTransaction: (event?: React.MouseEvent<HTMLButtonElement>) => void;
  splTokenData: ISplToken[];
}
​
interface SwapDetailProps {
  title: string;
  tooltipContent: string;
  value: string;
}
​
const SwapOperateContainer: FunctionComponent<
  SwapOperateContainerProps
> = props => {
  let wallet = useWallet();
  const SwapBtn = (swapProps: any) => {
    if (wallet.connected) {
      if (
        !swapProps.props.fromData.tokenInfo?.symbol ||
        !swapProps.props.toData.tokenInfo?.symbol
      ) {
        return (
          <button
            className={`${style.operateBtn} ${style.disabledBtn}`}
            disabled
          >
            Select a token
          </button>
        );
      }
      if (
        swapProps.props.fromData.tokenInfo?.symbol &&
        swapProps.props.toData.tokenInfo?.symbol
      ) {
        if (
          !swapProps.props.fromData.amount ||
          !swapProps.props.toData.amount
        ) {
          return (
            <button
              className={`${style.operateBtn} ${style.disabledBtn}`}
              disabled
            >
              Enter an amount
            </button>
          );
        }
      }
​
      return (
        <button
          className={style.operateBtn}
          onClick={props.sendSwapTransaction}
        >
          Swap
        </button>
      );
    } else {
      return (
        <div className={style.selectWallet}>
          <WalletModalProvider>
            <WalletMultiButton />
          </WalletModalProvider>
        </div>
      );
    }
  };
​
  const SwapDetailPreview: FunctionComponent<SwapDetailProps> = props => {
    return (
      <div className={style.slippageRow}>
        <div className={style.slippageTooltipBlock}>
          <div>{props.title}</div>
          <Tooltip
            hasArrow
            label={props.tooltipContent}
            color="white"
            bg="brand.100"
            padding="3"
          >
            <QuestionOutlineIcon
              w={5}
              h={5}
              className={`${style.icon} ${style.icon}`}
            />
          </Tooltip>
        </div>
        <div>{props.value}</div>
      </div>
    );
  };
​
  const SwapDetailPreviewList = (): JSX.Element => {
    return (
      <>
        <SwapDetailPreview
          title="Swapping Through"
          tooltipContent="This venue gave the best price for your trade"
          value={`${props.fromData.tokenInfo.symbol} > ${props.toData.tokenInfo.symbol}`}
        />
      </>
    );
  };
​
  return (
    <div className={style.swapCard}>
      <div className={style.cardBody}>
        <TokenSelect
          type="From"
          toggleTokenList={props.toggleTokenList}
          tokenData={props.fromData}
          updateAmount={props.updateAmount}
          wallet={wallet}
          splTokenData={props.splTokenData}
        />
        <div
          className={`${style.switchIcon} ${style.icon}`}
          onClick={props.switchFromAndTo}
        >
          <ArrowUpDownIcon w={5} h={5} />
        </div>
        <TokenSelect
          type="To"
          toggleTokenList={props.toggleTokenList}
          tokenData={props.toData}
          updateAmount={props.updateAmount}
          wallet={wallet}
          splTokenData={props.splTokenData}
        />
        <div className={style.slippageRow}>
          <div className={style.slippageTooltipBlock}>
            <div>Slippage Tolerance </div>
            <Tooltip
              hasArrow
              label="The maximum difference between your estimated price and execution price."
              color="white"
              bg="brand.100"
              padding="3"
            >
              <QuestionOutlineIcon
                w={5}
                h={5}
                className={`${style.icon} ${style.icon}`}
              />
            </Tooltip>
          </div>
          <div>{props.slippageValue}%</div>
        </div>
        {props.fromData.amount! > 0 &&
        props.fromData.tokenInfo.symbol &&
        props.toData.amount! > 0 &&
        props.toData.tokenInfo.symbol ? (
          <SwapDetailPreviewList />
        ) : (
          ""
        )}
        <SwapBtn props={props} />
      </div>
    </div>
  );
};
​
export default SwapOperateContainer;
index
Add the following code in ./views/raydium/index.tsx:
import { useState, useEffect, FunctionComponent } from "react";
import TokenList from "./TokenList";
import TitleRow from "./TitleRow";
import SlippageSetting from "./SlippageSetting";
import SwapOperateContainer from "./SwapOperateContainer";
import { Connection } from "@solana/web3.js";
import { Spinner } from "@chakra-ui/react";
import { useWallet, WalletContextState } from "@solana/wallet-adapter-react";
import { getPoolByTokenMintAddresses } from "../../utils/pools";
import { swap, getSwapOutAmount, setupPools } from "../../utils/swap";
import { getSPLTokenData } from "../../utils/web3";
import Notify from "../commons/Notify";
import { INotify } from "../commons/Notify";
import SplTokenList from "../commons/SplTokenList";
import { ISplToken } from "../../utils/web3";
import { IUpdateAmountData } from "./TokenSelect";
import style from "../../styles/swap.module.sass";
​
export interface ITokenInfo {
  symbol: string;
  mintAddress: string;
  logoURI: string;
}
export interface TokenData {
  amount: number | null;
  tokenInfo: ITokenInfo;
}
​
const SwapPage: FunctionComponent = () => {
  const [showTokenList, setShowTokenList] = useState(false);
  const [showSlippageSetting, setShowSlippageSetting] = useState(false);
  const [selectType, setSelectType] = useState<string>("From");
  const [fromData, setFromData] = useState<TokenData>({} as TokenData);
  const [toData, setToData] = useState<TokenData>({} as TokenData);
  const [slippageValue, setSlippageValue] = useState(1);
  const [splTokenData, setSplTokenData] = useState<ISplToken[]>([]);
  const [liquidityPools, setLiquidityPools] = useState<any>("");
  const [isLoading, setIsLoading] = useState<boolean>(false);
  const [notify, setNotify] = useState<INotify>({
    status: "info",
    title: "",
    description: "",
    link: ""
  });
  const [showNotify, toggleNotify] = useState<Boolean>(false);
​
  let wallet: WalletContextState = useWallet();
  const connection = new Connection("https://rpc-mainnet-fork.dappio.xyz", {
    wsEndpoint: "wss://rpc-mainnet-fork.dappio.xyz/ws",
    commitment: "processed"
  });
​
  useEffect(() => {
    setIsLoading(true);
    setupPools(connection).then(data => {
      setLiquidityPools(data);
      setIsLoading(false);
    });
    return () => {
      setLiquidityPools("");
    };
  }, []);
​
  useEffect(() => {
    if (wallet.connected) {
      getSPLTokenData(wallet, connection).then((tokenList: ISplToken[]) => {
        if (tokenList) {
          setSplTokenData(() => tokenList.filter(t => t !== undefined));
        }
      });
    }
  }, [wallet.connected]);
​
  const updateAmount = (e: IUpdateAmountData) => {
    if (e.type === "From") {
      setFromData((old: TokenData) => ({
        ...old,
        amount: e.amount
      }));
​
      if (!e.amount) {
        setToData((old: TokenData) => ({
          ...old,
          amount: 0
        }));
      }
    }
  };
​
  const updateSwapOutAmount = () => {
    if (
      fromData.amount! > 0 &&
      fromData.tokenInfo?.symbol &&
      toData.tokenInfo?.symbol
    ) {
      let poolInfo = getPoolByTokenMintAddresses(
        fromData.tokenInfo.mintAddress,
        toData.tokenInfo.mintAddress
      );
      if (!poolInfo) {
        setNotify((old: INotify) => ({
          ...old,
          status: "error",
          title: "AMM error",
          description: "Current token pair pool not found"
        }));
        toggleNotify(true);
        return;
      }
​
      let parsedPoolsData = liquidityPools;
      let parsedPoolInfo = parsedPoolsData[poolInfo?.lp.mintAddress];
​
      // //@ts-ignore
      const { amountOutWithSlippage } = getSwapOutAmount(
        parsedPoolInfo,
        fromData.tokenInfo.mintAddress,
        toData.tokenInfo.mintAddress,
        fromData.amount!.toString(),
        slippageValue
      );
​
      setToData((old: TokenData) => ({
        ...old,
        amount: parseFloat(amountOutWithSlippage.fixed())
      }));
    }
  };
#4 - BUIDL a Swap UI on Solana

TL; DR

Introduction

Overview

What does web3.js do?

How to find the program interface?

Structure

Setup

Install Dependencies

Scaffold

Add Common Components

`Navigator`

`Notify`

`SplTokenList`

`WalletProvider`

Add Pages for `Raydium` and `Jupiter`

Update Styles

`globals.css`

`navigator.module.sass`

`color.module.sass`

Update `app`

Part 1: Build a Swap on Raydium

What we need to implement Raydium swap?

Add Raydium Utils

Add Components

`TitleRow.tsx`

`TokenList.tsx`

`SlippageSetting.tsx`

`TokenSelect.tsx`

`SwapOperateContainer.tsx`

`index`
