我正在尝试构建 onChange 搜索功能。在建议列表中，我的状态是这样的:
results: {
page: 1,
results: [
{value: 'popularity.desc', label: 'Popularity Descending'},
{value: 'popularity.asc', label: 'Popularity Ascending'},
{value: 'new value', label: 'new label'},
{value: 'vote_average.desc', label: 'Rating Descending'}
]
}
当用户选择{value: 'new value', label: 'new label'}对象时。
如何将对象移动到状态结果数组的第一个索引？
例如:选择对象后。状态应该是这样的:
results: {
page: 1,
results: [
{value: 'new value', label: 'new label'},
{value: 'popularity.desc', label: 'Popularity Descending'},
{value: 'popularity.asc', label: 'Popularity Ascending'},
{value: 'vote_average.desc', label: 'Rating Descending'}
]
}
我的想法是使用扩展运算符和过滤器，但我不知道如何实现。
选择项目方法:
onSuggestionSelected = (event, {suggestion, suggestionValue }) => {
console.log('Selected', suggestion); // {value: 'new value', label: 'new label'}
if (suggestion.media_type === 'movie') {
this.navigate('/search/movie', suggestionValue, suggestion);
} else if (suggestion.media_type === 'tv') {
this.navigate('/search/tv', suggestionValue, suggestion);
} else {
this.navigate('/search', suggestionValue, suggestion);
}
};
选择后，将导航:
navigate = (pathname, queryValue, resultValue) => {
// ResultValue is that Object that I want to shift first.
this.props.history.push({
pathname,
search: `?query=${queryValue}`,
state: {results: this.state.data}});
};
最佳答案
//filtered the remaining item
let remainValue = result.filter((obj, key) => obj.value != suggestion.value);
//merge here
let newResult = [suggestion, ...remainValue]; //it will contain reordered item
关于javascript - 更新 React 中的状态 : array element nested in Object，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51133430/