我在订阅和 React 方面遇到了麻烦，也许我做得不对。
这是问题所在：我想创建一个包含 mongo 集合提供的电影列表的页面，还有一个流派过滤器和一个“加载更多”按钮。
当我只使用加载更多时，我更新发布以跳过现有项目并返回新项目，它运行良好。
当我更改流派过滤器时，我只需使用该过滤器更新我的出版物，也可以正常工作...
但是，如果我同时执行这两个操作，例如：加载更多，然后按类型过滤，结果看起来很糟糕并且似乎保留了旧结果，分页不会重置为默认值。
这是我的代码的简化版本。
服务器端发布：
Meteor.publish('movies.published', function ( sort = null, skip = 0, limit = 20, filters = {} ) {
if ( ! sort || typeof sort !== 'object' ) {
sort = {releaseDate: -1};
}
let params = Object.assign({
webTorrents: {
$exists: true,
$ne: []
},
status: 1,
}, filters);
console.log( '----------------Publishing--------------------');
let cursor = Movies.find(params, {
sort: sort,
skip: skip,
limit: limit
});
// Test publication
// Count is always good
console.log(cursor.fetch().length);
return cursor;
});
客户端组件：
import React from "react";
import TrackerReact from "meteor/ultimatejs:tracker-react";
import Movies from "/imports/api/movies/movies.js";
import Genres from "/imports/api/genres/genres.js";
const itemPerPage = 1; // let's say 1 item to simplify our test
const defaultOrder = 'releaseDate';
export default class Home extends TrackerReact(React.Component) {
constructor(props) {
super(props);
let options = Object.assign(Meteor.settings.public.list.options, {genres: Genres.find()});
this.state = {
subscription: {
movies: Meteor.subscribe('movies.published', {[defaultOrder]: -1}, 0, itemPerPage),
},
filters: {},
sort: defaultOrder,
options: options,
};
}
componentWillUnmount() {
this.state.subscription.movies.stop();
}
filterByGenre(event) {
let filterGenre = {
['genres.slug']: event.target.value !== '' ? event.target.value : {$ne: null}
};
this.updateFilters(filterGenre);
}
updateFilters( values ) {
// Merge filters
let filters = Object.assign(this.state.filters, values);
console.log('updating filters', filters);
// Update subscription with filters values
// here i must reset the pagination
this.state.subscription.movies.stop();
let newSubscription = Object.assign({}, this.state.subscription, {
movies: Meteor.subscribe('movies.published', {[this.state.sort]: -1}, 0, itemPerPage, filters),
});
this.setState({
subscription: newSubscription,
filters: filters,
})
}
loadMore( skip ) {
// Add an item
let newSubscription = Object.assign({}, this.state.subscription, {
movies: Meteor.subscribe('movies.published', {[this.state.sort]: -1}, skip, itemPerPage, this.state.filters),
});
this.setState({
subscription: newSubscription,
});
}
render() {
if ( ! this.state.subscription.movies.ready() ) {
return ( <div>loading...</div> );
}
// Get our items
let movies = Movies.find().fetch();
return (
<div>
<div className="container-fluid">
{/* Filters */}
<form className="form form-inline">
<div className="form-group m-r m-2x">
<select className="form-control" value={this.state.filters['genres.slug'] && this.state.filters['genres.slug']} onChange={this.filterByGenre.bind(this)}>
<option value="">Genres</option>
{this.state.options.genres.map((genre, key) => {
return <option key={key} value={genre.slug}>{genre.name}</option>
})}
</select>
</div>
</form>
<hr />
{/* list */}
<div className="row list">
{movies.map((movie) => {
return (
<div key={movie._id} className="col-xs-2">{movie.title}</div>
)
})}
</div>
{/* Load more */}
<button id="load-more" type="button" className="btn btn-sm btn-info" onClick={this.loadMore.bind(this, movies.length)}>
Load more
</button>
</div>
<div className="col-xs-3 pull-right text-right">{movies.length} movies</div>
<hr />
</div>
)
}
}
这是一个更好的方法吗？谢谢你的帮助 ！