# triggerSmartContract

Trigger a contract function and return TransactionWrapper, which contains the unsigned Transaction. See more about [Trigger Smart Contract](../../Interact%20with%20contract#triggersmartcontract);

## Usage

``` javascript
const transactionWrap = await tronWeb.transactionBuilder.triggerSmartContract(contractAddress,functions, options,parameter,issuerAddress);
```

## Parameters
| Argument        | Description                                                              | Type      |
| --------------- | ------------------------------------------------------------------------ | --------- |
| contractAddress | The smart contract address.                                              | String |
| function        | Function call, must not leave a blank space                              | String    |
| options         | Options when call smart contract function. | [`TriggerSmartContractOptions`](../../Interact%20with%20contract#triggersmartcontractoptions)      |
| parameter       | The parameter passed to 'function'                                       | `Array<{ type: string; value: unknown }>`     |
|ownerAddress     | Address in hex which calls the `function` | String |

## Returns
A wrapper which contains unsigned transaction object.
```typescript
interface TransactionWrapper {
    result: {
        result: boolean;
    };
    /**
     * The transaction object created by calling contract function.
     */
    transaction: Transaction;
}
```

## Example

``` javascript
var parameter = [{type:'address',value:'TV3nb5HYFe2xBEmyb3ETe93UGkjAhWyzrs'},{type:'uint256',value:100}];
var options = {
        feeLimit: 100000000,
        callValue: 0,
        tokenValue: 10,
        tokenId: 1000001,
        txLocal: true
    };
const transaction = await tronWeb.transactionBuilder.triggerSmartContract("419e62be7f4f103c36507cb2a753418791b1cdc182", "transfer(address,uint256)", options, parameter, "417946F66D0FC67924DA0AC9936183AB3B07C81126");
>{
    "result": {
        "result": true
    },
    "transaction": {
        "visible": false,
        "txID": "482b1a3b61894f75ea25bd10b14335a4db86c7e2c642ae07abc5a8ae45fb0027",
        "raw_data": {
            "contract": [
                {
                    "parameter": {
                        "value": {
                            "data": "a9059cbb000000000000000000000000d148171f1ceeeb40d668c47d70e7e94e679775590000000000000000000000000000000000000000000000000000000000000064",
                            "token_id": 1000001,
                            "owner_address": "417946f66d0fc67924da0ac9936183ab3b07c81126",
                            "call_token_value": 10,
                            "contract_address": "419e62be7f4f103c36507cb2a753418791b1cdc182"
                        },
                        "type_url": "type.googleapis.com/protocol.TriggerSmartContract"
                    },
                    "type": "TriggerSmartContract"
                }
            ],
            "ref_block_bytes": "3a27",
            "ref_block_hash": "83ca272ba6030b83",
            "expiration": 1581935001000,
            "fee_limit": 100000000,
            "timestamp": 1581934943649
        },
        "raw_data_hex": "0a023a27220883ca272ba6030b8340a8fbb195852e5ab401081f12af010a31747970652e676f6f676c65617069732e636f6d2f70726f746f636f6c2e54726967676572536d617274436f6e7472616374127a0a15417946f66d0fc67924da0ac9936183ab3b07c811261215419e62be7f4f103c36507cb2a753418791b1cdc1822244a9059cbb000000000000000000000000d148171f1ceeeb40d668c47d70e7e94e679775590000000000000000000000000000000000000000000000000000000000000064280a30c1843d70a1bbae95852e900180c2d72f"
    }
}
```