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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/contracts.rst | 48 |
1 files changed, 10 insertions, 38 deletions
diff --git a/docs/contracts.rst b/docs/contracts.rst index a1a44665..3bd6f6a8 100644 --- a/docs/contracts.rst +++ b/docs/contracts.rst @@ -16,51 +16,23 @@ inaccessible. Creating Contracts ****************** -Contracts can be created "from outside" or from Solidity contracts. +Contracts can be created "from outside" via Ethereum transactions or from within Solidity contracts. + +IDEs, such as `Remix <https://remix.ethereum.org/>`_, make the creation process seamless using UI elements. + +Creating contracts programatically on Ethereum is best done via using the JavaScript API `web3.js <https://github.com/etherem/web3.js>`_. +As of today it has a method called `web3.eth.Contract <https://web3js.readthedocs.io/en/1.0/web3-eth-contract.html#new-contract>`_ +to facilitate contract creation. + When a contract is created, its constructor (a function with the same name as the contract) is executed once. - A constructor is optional. Only one constructor is allowed, and this means overloading is not supported. -From ``web3.js``, i.e. the JavaScript -API, this is done as follows:: - - // Need to specify some source including contract name for the data param below - var source = "contract CONTRACT_NAME { function CONTRACT_NAME(uint a, uint b) {} }"; - - // The json abi array generated by the compiler - var abiArray = [ - { - "inputs":[ - {"name":"x","type":"uint256"}, - {"name":"y","type":"uint256"} - ], - "type":"constructor" - }, - { - "constant":true, - "inputs":[], - "name":"x", - "outputs":[{"name":"","type":"bytes32"}], - "type":"function" - } - ]; - - var MyContract_ = web3.eth.contract(source); - MyContract = web3.eth.contract(MyContract_.CONTRACT_NAME.info.abiDefinition); - // deploy new contract - var contractInstance = MyContract.new( - 10, - 11, - {from: myAccount, gas: 1000000} - ); - .. index:: constructor;arguments -Internally, constructor arguments are passed after the code of -the contract itself, but you do not have to care about this -if you use ``web3.js``. +Internally, constructor arguments are passed :ref:`ABI encoded <ABI>` after the code of +the contract itself, but you do not have to care about this if you use ``web3.js``. If a contract wants to create another contract, the source code (and the binary) of the created contract has to be known to the creator. |