{"id":2761,"date":"2020-06-30T23:49:02","date_gmt":"2020-06-30T11:49:02","guid":{"rendered":"http:\/\/www.talkcrypto.org\/blog\/?p=2761"},"modified":"2020-07-14T13:03:32","modified_gmt":"2020-07-14T01:03:32","slug":"solidity-events","status":"publish","type":"post","link":"https:\/\/www.talkcrypto.org\/blog\/2020\/06\/30\/solidity-events\/","title":{"rendered":"Solidity events"},"content":{"rendered":"\n

In Solidity, firing or emitting events is a handy tool that you can employ not only to log messages for simple debugging but more importantly Dapps or anything connected to the Ethereum JSON-RPC API can listen to these events and act accordingly. Events can also be indexed so that the event history is searchable later as well. <\/p>\n\n\n\n

Here is a very simple example of creating an event.<\/p>\n\n\n\n

pragma solidity ^0.6.0;
 contract EmitEvent {
     event log();
     function triggerLog() public {
         emit log();
     }
 }<\/pre>\n\n\n\n
You first have to declare the event and then give it a name along with the parameters you want to pass around. The above example does not have any parameters. The example below has one parameter.<\/p>\n\n\n\n
pragma solidity ^0.6.0;
 contract EmitEvent {
     event log(string _logmessage);
     function triggerLog() public {
         emit log(\"hi\");
     }
 }<\/pre>\n\n\n\n
The event gets displayed in the logs of the transactions in remix. <\/p>\n\n\n\n
\"\"

<\/figcaption><\/figure>\n\n\n\n
Watch the video below for a walkthrough.<\/p>\n\n\n\n
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