Problem:
我将立法者集合放入表中,字段标题是按钮,并附加了单击事件,通过单击的字段按钮对集合进行排序。
render() {
const legislatorList = this.populateList() // creates an Array of Legislator components
return (
<div className="legislators">
<h2>Legislators</h2>
<table className="table table-bordered">
<thead>
<tr>
<th><button type="button" onClick={ () => this.handleChange("first_name")} >First</button></th>
<th><button type="button" onClick={ () => this.handleChange("last_name")} >Last</button></th>
<th><button type="button" onClick={ () => this.handleChange("state")} >State</button></th>
<th><button type="button" onClick={ () => this.handleChange("party")} >Party</button></th>
</tr>
</thead>
<tbody>
{ legislatorList }
</tbody>
</table>
</div>
);
单击事件将 this.state.legislators 重新分配给 a sort 函数的输出。
handleChange( value ) {
this.setState( { legislators: this.sort_by( value) })
}
但即使 state.legislators 的更新状态已正确排序,该表仍保持不变。
我认为我的问题是立法者的子立法者组件没有更新其状态。所以我的问题是如何更新子组件的状态?
Before Any Sorting:
![enter image description here](https://i.stack.imgur.com/GXoOS.png)
After Sorting by First Name:
![enter image description here](https://i.stack.imgur.com/hm7kX.png)
立法者的其他职能:
sort_by(sort_by) {
const sorted = this.state.legislators.sort(function(a, b) {
a_val = a[sort_by]
b_val = b[sort_by]
if (a_val < b_val) {
return -1;
}
if (a_val > b_val) {
return 1;
}
return 0;
});
return sorted
}
renderLegislator(legislator) {
return <Legislator legislator={ legislator}/>
}
populateList() {
return this.state.legislators.map((legislator) =>
this.renderLegislator(legislator)
)}
}
这是立法者部分:
class Legislator extends React.Component {
constructor(props) {
super();
this.state = {
legislator: props.legislator,
fields: ["first_name", "last_name", "state", "party"]
}
}
render() {
const legislatorRow = this.state.fields.map((field) =>
<LegislatorField value={ this.state.legislator[field] } />
)
return (
<tr key={this.state.legislator.id}>
{ legislatorRow }
</tr>
);
}
}