Calculate trasnaction fee for approve function?

Moralis General
#1

how can i calculate the trasnaction fee for the approve function ?

                contractInstance.methods.approve(to, transaction.price.toString()).send({from: this.walletAddress})

i know that its made like that

        let gasPrice = await web3.eth.getGasPrice();
        let gasLimit = await web3.eth.estimateGas(transactionObject);
        return gasPrice * gasLimit;

but where is the trasnacitonObject here ?

#2

See the docs on how to use estimateGas with a contract function.