Learn Ethereum

Building a navigation bar

Once we get a smart contract instance, it will be quite easy to get the token name and symbol information and display it on our navigation bar. Here is the code to get symbol:

 const symbol = await contractInstance.methods.symbol().call()

Note that contractInstance.methods.myMethod([param1[, param2[, ...]]]).call(transactionObject, blockNumber, callback]) in web3 is used to return a result from a read-only method. This call() function does not send any transaction in EVM.

The params call transaction object can be an optional input, as shown here:

• from: Caller address
• gasPrice: The call transaction gas price in wei
• gas: The maximum number of gas limits

While using call(), the function doesn't change any state. ...