[Ethereum] Can’t connect to local rinkeby node from web3.js

go-ethereumtruffleweb3js

I'm developing a Dapp using truffle and I need to connect to a contract that I uploaded on rinkeby using truffle migrate --network rinkeby. Problem is that I'm unable to connect to the rinkeby network from the web3 interface. I run a rinkeby local node using 

geth --rinkeby --rpc --rpcapi db,eth,net,web3,personal --rpcport 8545 --rpcaddr localhost --rpccorsdomain "*" --unlock="0x4A1b47b0b119AFD421ec4E3b5B54D8EF5141b59c"

The front-end code is

if (typeof web3 !== 'undefined'){
        web3 = new Web3(web3.currentProvider);
    }else{
        web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
  }

But the code always slaps me with 

Error: Provider not set or invalid.

How can I resolve this issue and how to create a new contract instance from contract abi?

Best Answer

Dapp using truffle and local server this commend run: 

geth --rinkeby --rpc --rpcapi db,eth,net,web3,personal --rpcport 8545 --rpcaddr "http://localhost:8000" --rpccorsdomain "*" --unlock="0x4A1b47b0b119AFD421ec4E3b5B54D8EF5141b59c"

and try it http://localhost:8000

Rpc domain --rpc --rpccorsdomain "http://localhost:8000" then run project

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