Dynamically calling a function on a contract

Question

I'm trying to call different functions of a contract with a single function that has the function name passed to it as an argument.

var Web3 = require('web3');
const web3 = new Web3(new Web3.providers.HttpProvider('https://mainnet.infura.io'));
var myContract = new web3.eth.Contract(JSON.parse(data.abi), data.address);

var method = data.method // 'getWord'
myContract.methods.getWord().call().then(function(value) {
        console.log(value)
    }, function(error) {
        console.log(error)
    });

Above I have created a variable called method and its value has been set to getWord on the line below I am calling getWord()

What I'm trying to do is call whatever function is named in data.method like this...

    myContract.methods.[data.method].call().then(function(value) {
        console.log(value)
    }, function(error) {
        console.log(error)
    });

but of course it breaks and id prefer to not use eval() like this

    var myContract = new web3.eth.Contract(JSON.parse(data.abi), data.address);
    eval('myContract.methods.'+data.method+'().call()')  
    .then(function(value) {
        console.log(value)
    }, function(error) {
        console.log(error)
    });

Is there another way?

user19510 · Accepted Answer · 2017-10-23T16:07:59.980

2

It should just be:

myContract.methods[data.method]().call()

(You had an extra dot in there.)

edited Oct 23 '17 at 16:07

answered Oct 23 '17 at 04:13

user19510

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I tried without the dot and got TypeError: myContract.methods[data.method].call(...).then is not a function – Bill Oct 23 '17 at 05:22
Sorry, see my edit. I forgot to actually call the function. :-) – user19510 Oct 23 '17 at 16:08

Dynamically calling a function on a contract

1 Answers1