Solana: How to code a statement and send a transaction to an anchor-based program using javascript

Encoding Instructions on Solana with JavaScript

Solana is a fast and secure blockchain platform that enables developers to create decentralized applications (dApps) without requiring extensive programming knowledge. One of the key features of Solana is its ability to execute transactions using a specific instruction, which can be used to send funds or data between accounts.

In this article, we will walk through the process of encoding an instruction and sending it to an Anchor-based program using JavaScript on the Solana blockchain.

Prerequisites

Before you begin, make sure you have the following installed:

• Solana CLI (npm install-g solana-cli)

• Node.js (14 or higher)

• A Solana wallet (e.g., Solana CLI Wallet)

Encoding Instructions

Instructions on Solana can be encoded using a specific instruction, which is defined in the [Solana Instruction Set Language (ISL)] ( In this example, we will use the load instruction to load an anchor program.

Step 1: Install required dependencies

Create a new directory for your project and initialize it using the Solana CLI:

mkdir solana-instruction-example

cd blame-instruction-example

solana init

Next, install the necessary dependencies:

npm install solana-typescript@latest

npm install @solana/web3.js

Step 2: Create a new Solana program

Create a new file called index.ts and add the following code to create a new anchor program:

// index.ts


import { Program } from "@solana/web3.js";

import { instructionId , loadProgram } from " . / instruction " ;


const mainnetProgram = await loadProgram(

  "mainnet"

  "

);


export default async function main() { export default async function main() { export default async function main() { ;

  const program = mainnetProgram;

  const anchorUrl = process.env.ANCHOR_URL;


  try {

    const result = await programInstructionId(main, loadProgram());

    console . log ( result ) ;

  } catch (error) {

    if ( error instanceof InstructionFallbackNotFound ) {

      console.error("AnchorError occurred. Error Code: InstructionFallbackNotFound");

    } else {

      throw error;

    } }

  } }

} }

Step 3: Encode the instruction

Create a new file called instruction.ts and add the following code to encode the instruction:

// instruction.en


import { Instruction, InstructionData } from "@solana/web3.js";

import { programId } from "./program";


export default async function encodeInstruction(program: Program) {

  const instruction = waiting program.loadInstruction(

    instructionId,

    "load"

    "mainnet"

    true

  );

  return instruction . encode ( ) ;

} }

Step 4: Send the transaction

Create a new file called sendTransaction.ts and add the following code to send the transaction:

// sendTransaction.ts


import { Transaction , TransactionInput } from " @solana/web3.js " ;

import { encodeInstruction , loadProgram } from " . / instruction " ;


const mainnetProgram = await loadProgram(

  "mainnet"

  "

);


function sendTransaction() {

  const transaction = new Transaction();

  const input = new TransactionInput();

  input.add(loadProgram().invokeInstructionId("load", programId));

  const encodedTransaction = encodeInstruction(mainNetProgram);

  transaction . add ( encodedTransaction ) ;

  return transaction;

} }


export default async function main() { export default async function main() { export default async function main() { ;

  const tx = await sendTransaction();

  console . log ( tx ) ;

} }

Putting it all together

Create a new file called index.ts and add the following code to compile and run the example:

“`typescript

// index.ts

import { createProgramScript , loadProgram } from ” . / instruction ” ;

import { mainnetProgram } from