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• error : fired in case an error is returned, if the transaction is rejected or if it fails. The events are useful for informing the user about the status of their transaction. This should be in addition to MetaMask transactions and will be further dis- cussed in the UX section. Similarly, we are also able to call the functions of our smart contracts to create, cancel and end offers or requests. Moreover, after a number of confirmations, we trigger updates of the state of our Redux store since there could be changes to the ownership of the NFTs or the list of offers and requests. 4.2.6 Managing the state of the Application Having explained how the Redux store works and how the calls to the services are made, we will go into detail about managing the state of the components in React and how we trigger Redux actions. In this subsection we will focus on the logic of updating the App.js . It is the entry point of the website and we use the life-cycle methods to trigger and react to changes. Figure 4.4: React life-cycle methods. [58] The first life-cycle method used is componentDidMount which is called after the component is mounted and rendered. Our homepage is static and and we use this life-cycle method to call the getAccountAddressAction . This will retrieve the address of the user as explained in the previous subsec- tion, update the Redux store and subsequently update all the components that are connected to the Redux store, App.js being one of them. The next life-cycle method we make use of is componentDidUpdate which is called after the an update of the state occurs. It enables us to compare the previous props of App.js with the current props and check for any changes. It is critical to check for changes or re-rendering could occur in an infinite loop. 54PDF Image | NFT finance Leveraging Non-Fungible Tokens
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