Usage

// Format
tronWeb.transactionBuilder.triggerConstantContract(contractAddress,functions, options,parameter,issuerAddress);

Arguments

Argument	Description	Type
contractAddress	The smart contract address.	hexString
function	Function call, must not leave a blank space	String
options	Optional fields(permission id, feelimit and other parameters)	Object
parameter	The parameter passed to 'function'	Array
issuerAddress	Address that triggers the contract	hexString

Return

Object

Example

const parameter1 = [{ type: 'address', value: 'TV3nb5HYFe2xBEmyb3ETe93UGkjAhWyzrs' }, { type: 'uint256', value: 100 }];
const transaction = await tronWeb.transactionBuilder.triggerConstantContract("419e62be7f4f103c36507cb2a753418791b1cdc182", "transfer(address,uint256)", {}, 
  parameter1, "417946F66D0FC67924DA0AC9936183AB3B07C81126");
>{
    "result": {
        "result": true
    },
    "energy_used": 29631,
    "constant_result": [
        "0000000000000000000000000000000000000000000000000000000000000000"
    ],
    "logs": [
        {
            "address": "9e62be7f4f103c36507cb2a753418791b1cdc182",
            "data": "0000000000000000000000000000000000000000000000000000000000000064",
            "topics": [
                "ddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
                "0000000000000000000000007946f66d0fc67924da0ac9936183ab3b07c81126",
                "000000000000000000000000d148171f1ceeeb40d668c47d70e7e94e67977559"
            ]
        }
    ],
    "transaction": {
        "ret": [
            {}
        ],
        "visible": false,
        "txID": "5c280444c82f3050e4b0c672ab98bae264830d80b09db6c861b31699f6bcaaa8",
        "raw_data": {
            "contract": [
                {
                    "parameter": {
                        "value": {
                            "data": "a9059cbb000000000000000000000000d148171f1ceeeb40d668c47d70e7e94e679775590000000000000000000000000000000000000000000000000000000000000064",
                            "owner_address": "417946f66d0fc67924da0ac9936183ab3b07c81126",
                            "contract_address": "419e62be7f4f103c36507cb2a753418791b1cdc182"
                        },
                        "type_url": "type.googleapis.com/protocol.TriggerSmartContract"
                    },
                    "type": "TriggerSmartContract"
                }
            ],
            "ref_block_bytes": "3d8f",
            "ref_block_hash": "316b196f79afe0dc",
            "expiration": 1649655780000,
            "timestamp": 1649655730243
        },
        "raw_data_hex": "0a023d8f2208316b196f79afe0dc40a0a596b981305aae01081f12a9010a31747970652e676f6f676c65617069732e636f6d2f70726f746f636f6c2e54726967676572536d617274436f6e747261637412740a15417946f66d0fc67924da0ac9936183ab3b07c811261215419e62be7f4f103c36507cb2a753418791b1cdc1822244a9059cbb000000000000000000000000d148171f1ceeeb40d668c47d70e7e94e67977559000000000000000000000000000000000000000000000000000000000000006470c3a093b98130"
    }
}

Note: After GreatVoyage-v4.3.0(Bacon), user can invoke the read-only method as well as the non-read-only method of a contract via wallet/triggerconstantcontract API, and there is a new field energy_limit in the return value, it means the actual energy consumption of this contract invoking. This API can be used to forecast energy usage.