Create Vote-Follow/Trail Script With Stem.js JavaScript Library (Steem.js #4)

Repository

https://github.com/steemit/steem-js

What Will I Learn?

In this tutorial you will learn how to create and use script that will follow all votes from wanted user.

• How to get data from head block in Steem blockchain.
• How to follow votes from wanted user(s).

Requirements

State the requirements the user needs in order to follow this tutorial.

• Linux or Windows terminal
• Node.js: sudo apt-get install nodejs for linux
  https://nodejs.org/en/download/ for windows
• Node.js package manager npm: sudo apt-get install npm for linux
  For windows it's already included in Nodejs installer.
• Steem.js: npm install steem --save

Difficulty

• Basic

Create Vote-Follow / Trail Script With Steem.js

In this tutorial I will be using Windows 10 and Atom.io text editor.

First let's create file vote-follow.js and open in in your favorite text editor.

Add first line of code: var steem = require('steem'); This will 'connect' variable steem to Steem.js.

Than add steemj.js function streamTransactions . This will get data from head (current) block.

        steem.api.streamTransactions('head', function(err, result) {
          let txType = result.operations[0][0]
          let txData = result.operations[0][1]
          let includesVotes = checkBlockForVote(txType,txData)
          if (includesVotes) {
            console.log('POST FOUND: ', txData)
          }
        });

This part for code will check data from block. If voter is fbslo it will run function "upvote".

function checkBlockForVote(txType,txData) {
          //check if voter is fbslo. If voter = fbslo, your account will vote same post.
          if( txData.voter == 'fbslo') {
            console.log('POST: ', txData)
            upvote(txData)
          }
        }

Now we need to set function "upvote". It will contain steem.broadcast.vote from steem.js. Parts of code are explained in comments (//comment)

function upvote(txData){
          console.log('Upvoting...',  )
          //You account name
          var voter = 'your-account';
          //Your account private posting key
          var wif = 'private-posting-key';
          var author = txData.author
          var permlink = txData.permlink
          //Change weight 100% vote = 10000; if you use txData.weight it will upvote with same voting weight as "followed" voter.
          var weight = txData.weight
          //Broadcast vote to blockchain
          steem.broadcast.vote(wif,voter,author,permlink,weight,console.log)

        }

Full Code

//get steem.js -> npm install steem --save
var steem = require('steem');

//get transactions from head block
        steem.api.streamTransactions('head', function(err, result) {
          let txType = result.operations[0][0]
          let txData = result.operations[0][1]
          let includesVotes = checkBlockForVote(txType,txData)
          if (includesVotes) {
            console.log('POST FOUND: ', txData)
          }
        });
        function checkBlockForVote(txType,txData) {
          //check if voter is fbslo. If voter = fbslo, your account will vote same post.
          if( txData.voter == 'fbslo') {
            console.log('POST: ', txData)
            upvote(txData)
          }
        }
        function upvote(txData){
          console.log('Upvoting...',  )
          //You account name
          var voter = 'your-account';
          //Your account private posting key
          var wif = 'private-posting-key';
          var author = txData.author
          var permlink = txData.permlink
          //Change weight 100% vote = 10000; if you use txData.weight it will upvote with same voting weight as "followed" voter.
          var weight = txData.weight
          //Broadcast vote to blockchain
          steem.broadcast.vote(wif,voter,author,permlink,weight,console.log)
 }

Video:

Curriculum

• Vote from Steem.js
• Transfer from Steem.js
• Post from Steem.js
• Auto-Transfer Script With Steem.js

Proof of Work Done

https://github.com/fbslo/voting-bots/blob/master/voting-trail.js