ReactJS：当子组件调用父组件时，“ this.props”不是一个函数
我已经编写了这段代码，目前正在处理onClick事件中的错误。我有两个事件，子元素上的onClick事件和顶级父元素上的onChange事件。
预期的行为应该是更改当前在Container组件中保存的activeAccount变量。为此，我在AccountRow组件上添加了一个onClick处理程序，然后应调用顶级父级的onChange函数。
但是，线
'this.props.onChange(this.props.account)',在
handleClick: function(e) { this.props.onChange(this.props.account);
},
旨在使用参数“ this.props.account”调用父函数，
给我这个错误：
Uncaught TypeError: this.props.onChange is not a function.我最初以为这是一个范围问题，但是我添加了
{...this.props}在父容器组件内的每个子项和嵌套子项上。因此，所有道具都应向下传播到AccountRow组件。但是，问题仍然存在。
var ACCOUNTS = [ {name: 'cash on hand'},
{name: 'savings account'},
{name: 'shared account'},
{name: 'my second wallet'}
];
var TRANSACTIONS = [
{date: '', name: 'Bananas', amount: 6, category: 'Groceries', account: 'cash on hand'},
{date: '', name: 'Apples', amount: 2.50, category: 'Groceries', account: 'cash on hand'},
{date: '', name: 'Cash withdrawal', amount: 250, account: 'savings account'}
];
var AccountRow = React.createClass({
handleClick: function(e) {
this.props.onChange(this.props.account);
},
render: function () {
return (
<li onClick = {this.handleClick}> {this.props.account}</li>
)}
});
var AccountList = React.createClass({
render: function () {
var rows = [];
this.props.accounts.map(function(each_account) {
rows.push(
<AccountRow
account = {each_account.name}
key = {each_account.name}
{...this.props}
/>);
})
return (
<ul>
{rows}
</ul>
)
}
});
var NavBar = React.createClass({
render: function () {
return (
<div id = 'account-tabs'>
<h2> Accounts </h2>
<AccountList
accounts = {this.props.accounts}
{...this.props}
/>
</div>
)
}
});
var TransactionRow = React.createClass({
render: function (){
var trans = this.props.transaction;
return (
<tr>
<td>{trans.date}</td>
<td>{trans.name}</td>
<td>{trans.amount}</td>
<td>{trans.account}</td>
<td><a href = ''>edit</a></td>
</tr>
)
}
});
var TransactionList = React.createClass ({
render: function () {
var activeaccount = this.props.activeAccount;
var rows = [];
this.props.transactions.map(function(each_transaction) {
if (each_transaction.account == activeaccount) {
/* Very strange behaviour
if (each_transaction account == this.props.activeAccount)
DOES NOT WORK, I do not know why this is the case
*/
rows.push(<TransactionRow transaction = {each_transaction} key = {each_transaction.name} />);
}
else {
/*console.log(each_transaction.account);*/
}
})
return (
<tbody>
{rows}
</tbody>
)
}
});
var TransactionsTable = React.createClass({
render: function() {
return (
<div id = 'recent-transactions'>
<h2>Recent Transactions for {this.props.activeAccount}</h2>
<table>
<tr>
<th>date</th>
<th>name</th>
<th>amount</th>
<th>account</th>
<th>edit </th>
</tr>
<TransactionList
transactions = {this.props.transactions}
activeAccount = {this.props.activeAccount}
/>
</table>
</div>
)
}
});
var TransactionForm = React.createClass({
render: function() {
return (
<div>
<h2>Add Transaction </h2>
<p>Transaction name</p>
<input type = 'text' />
<p>Price</p>
<input type = 'number'/>
<p>Category (optional) </p>
<input type = 'text' />
</div>
)
}
});
var ButtonMenu = React.createClass ({
render: function () {
return (
<div>
<button>Add Transaction</button>
</div>
)
}
});
var Container = React.createClass({
getInitialState: function (){
return {
activeAccount: ACCOUNTS[0].name
};
},
setActiveAccount: function(dat) {
this.setState({
activeAccount: dat
});
},
render: function () {
return (
<div id = 'wrapper'>
<NavBar
accounts = {ACCOUNTS}
activeAccount = {this.state.activeAccount}
onChange = {this.setActiveAccount}
{...this.props}
/>
<TransactionsTable
transactions = {TRANSACTIONS}
activeAccount = {this.state.activeAccount}
/>
<TransactionForm />
<ButtonMenu />
</div>
);
}
});
React.render(<Container />, document.body);
感谢您的时间。
回答：
这个问题是造成map功能，你应该通过在this对thisArg调用时map：
this.props.accounts.map(function(each_account) { rows.push(
<AccountRow
account = {each_account.name}
key = {each_account.name}
{...this.props}
/>);
}, this);
但是，这将导致AccountRow具有诸如accounts和的冗余变量activeAccount。我认为您应该考虑仅转移onChange功能：
<AccountRow account = {each_account.name}
key = {each_account.name}
onChange = {this.props.onChange}
/>
以上是 ReactJS：当子组件调用父组件时，“ this.props”不是一个函数 的全部内容， 来源链接： utcz.com/qa/397403.html
