I have DApp with a Smart Contract which is holding some offers (id, price, owner etc.). I want to show that offers in my DApp-Frontend.
First I am calling the Smart Contract and fetching all offers into an array with JavaScript:
// Load offers
for (var i = 1; i <= offerCount; i++) {
const offer = await contract.methods.offers(i).call()
this.setState({
offers: [...this.state.offers, offer]
})
}
Then I want to show the content of that array in a table:
<table className="table">
<thead>
<tr>
<th scope="col">#</th>
<th scope="col">Price</th>
<th scope="col">Owner</th>
<th scope="col"></th>
</tr>
</thead>
<tbody>
{
this.props.offers.map((offer, key) => {
return (
<tr key={key}>
<th scope="row">{offer.id.toString()}</th>
<td>{this.state.offers}</td>
</tr>
)
})
}
</tbody>
</table>
I am getting the error TypeError: Cannot read property 'map' of undefined
I don't know how to show the data properly on the table.
Library: React
OS: XUbuntu
Browser: Chrome
TypeError: Cannot read property 'map' of undefined
This error is because this.props.offers is undefined.
You have to use this.state.offers, I think.
{
this.state.offers.map((offer, key) => {
return (
<tr key={key}>
<th scope="row">{offer.id.toString()}</th>
<td>{this.state.offers}</td>
</tr>
)
})
}
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