How to send several arguments to an solidity function using an array or a dictionary?

Question

Sorry in advance for my english I am French :)

I try to create a simple ethereum wallet. The idea is to allow the user to create a contract and to interact with it. I am using meteor, web3 and an testRPC node.

Basically for the interactions with the contract, for each contract I print on the browser the list of its functions . The user has just to click on the function he wants, then a pop up is printed to retrieve the arguments of the functions. Then I use web3 to send the request to a testRPC node and use a callback to print the result for the user.

The problem is that basically I don't obviously know in advance what is the function and the arg. So I index each of my html file with a special number and in combination with the dataBase, I retrieve the address of the contract, and all the informations about the function (using the ABI). Then I create three variables :

1. a variable contract
2. a variable functionPrototype = abi of my function
3. a dictionary args = {nameArg1 : arg1, nameArg2 : arg2 etc...} which contains my arguments.

Then I have the contract, the name of the function and the args.

If the original Solidity function is :

• function whatever(type nameArg1, type nameArg2) public{}

I would like to use the following web3 function to send my request:

• contract[functionPrototype.name](args, {from: account, gas: 350000}, function(err, result){})

But this request doesn't work . The following request, when I write all the args, works :

• contract[functionPrototype.name](arg1, arg2, {from: account, gas: 350000}, function(err, result){})

So the people can say : why you don't use the second request?

Because there are an infinite number of functions and I can't write all the arguments for each function. I need to automate all the process, so basically retrieve the arg and the name of the functions and using as input a dictionary or an array.

I have tried to use the function apply, with an array but it doesn't work either. I have all the time a WebSocket is closed due to suspension.

So do you know how I can send my arguments using a dictionary or an array to a solidity function?

Merci beaucoup!!!

And good luck for your jobs

Answer 1

What was your code for the apply function? It should be

contract[funcName].apply(contract, paramsArray)

If your framework support ES2015 you can use spread in function calls

contract[funcName](...paramsArray)