使用 React JS 制作动画

Question

我的页面上有一些排序过滤器，我想在用户单击其中一个时创建动画。

如果用户想按最低价格排序，我想显示新列表，但带有一些动画。

我尝试用 React JS 来做。

在 componentWillMount 我设置所有汽车的状态：

componentWillMount(){
    const cart = this.props.cart;
    const listID = this.props.params.id;
    const allCars = data.getAllCars();
    let offers = this.state.offers;

    cart.map(car => {
        const aCar = allCars.find(c => {
            return c.id === car.carID;
        });
        offers[aCar.chassis] = car.offer;
        this.setState({offers: offers});
    });


    //We set state with all cars in this list
    const cars = carData.getCarsInCurrentList(listID, allCars);
    this.setState({cars: cars});
}

然后当用户单击其中一个排序过滤器时，我会在此功能上处理它：

handleSortingFilters(name, event){

    event.preventDefault();
    const cars = this.state.cars;
    const sortFilterValue = this.state.sortFiltersInit[name];
    let filteredCars = "";

    if(sortFilterValue){
        //descending order
        filteredCars = cars.sort((a, b) => {
            if(name === "initialRegistration"){
                return Date.parse(b[name]) - Date.parse(a[name]);
            }else{
                return parseFloat(b[name]) - parseFloat(a[name]);
            }
        });
    }else{
        //ascending order
        filteredCars = cars.sort((a, b) => {
            if(name === "initialRegistration") {
                return Date.parse(a[name]) - Date.parse(b[name]);
            }else{
                return parseFloat(a[name]) - parseFloat(b[name]);
            }

        });
    }

    let sortFiltersInit = this.state.sortFiltersInit;
    sortFiltersInit[name] = !this.state.sortFiltersInit[name];

    let allFilters = this.state.allFilters;
    allFilters[name] = name;

    this.setState({cars: filteredCars, sortFiltersInit: sortFiltersInit, allFilters: allFilters});
}

因此，我使用过滤后的汽车列表更新状态。一切都很完美，但是当用户单击其中一个排序过滤器时，我还想在列表中应用一些 css 动画。

任何想法或链接到一些好的教程？

谢谢。

更新

渲染汽车的列表：

<div className="cars">
            <div>
                <ReactCSSTransitionGroup
                transitionName="example"
                transitionAppear={true}
                transitionAppearTimeout={500}
                transitionEnterTimeout={500}
                transitionLeaveTimeout={500}>

                {cars.map((car, i) => {
                    const initialReg = car.initialRegistration.slice(0,3) + car.initialRegistration.slice(6,10);
                    // str.slice(1, 4) extracts the second character through the fourth character (characters indexed 1, 2, and 3)

                    return (
                        <div key={i} className="carBox noPadding">
                            <div className="carBoxContent">

                                <PhotoAndFavorites car={car} language={language} changeStarIcon={this.changeStarIcon} addToFavorites={addToFavorites} userEmail={currentUserEmail} favorites={favorites}/>

                                <div className="carNameAndDesc">
                                    <div><Link to="" style={{textDecoration: 'none'}}>{car.make}</Link></div>
                                    <div>{car.desc}</div>
                                </div>

                                <div className="carPrice">
                                    <div>{car.price}</div>
                                    <div>{car.btw}</div>
                                </div>

                                <div className="extraFeatures" style={{marginBottom: 5, backgroundColor: '#eee'}}>

                                </div>

                                <div className="mainFeatures">
                                    <div><img src="../images/portal/user/status/fuel-icon.png" style={{height: 12}}/> <span>{car.fuel}</span></div>
                                    <div><img src="../images/portal/user/status/road-icon.png" style={{height: 12}}/> <span>{car.mileage}</span></div>
                                    <div><img src="../images/portal/user/status/calendar-icon.png" style={{height: 12}}/> <span>{initialReg}</span></div>
                                </div>

                                <Buttons car={car}
                                         language={language}
                                         changeButton={this.changeButton}
                                         addToCard={addToCard}
                                         removeFromCard={removeFromCard}
                                         cartContent={cartContent}
                                         userEmail={currentUserEmail}
                                         handleChange={handleOffers}
                                         offers={offers}
                                         opacity={this.props.opacity}
                                         />

                            </div>
                        </div>
                    );
                })}
                </ReactCSSTransitionGroup>
            </div>
            <div className="clearfix"/>
        </div>

我还添加了这个 css：

 .example-appear {
  opacity: 0.01;
}

.example-appear.example-appear-active {
  opacity: 1;
  transition: opacity .5s ease-in;
}

Answer 1

你可以使用react-addons-css-transition-group

ReactCSSTransitionGroup 基于ReactTransitionGroup 并且是 在 React 中执行 CSS 过渡和动画的简单方法 组件进入或离开 DOM。它的灵感来自于优秀 ng-animate 库。

这将在您每次更改路线时触发主布局中的转换

css

.example-enter {
  opacity: 0.01;
  transition: opacity .5s ease-in;
}

.example-enter.example-enter-active {
  opacity: 1;
}

.example-leave {
  opacity: 1;
  transition: opacity .5s ease-in;
}

.example-leave.example-leave-active {
  opacity: 0;
}

js

import React from 'react'
import ReactCSSTransitionGroup from 'react-addons-css-transition-group'

render() {
  return(
    <ReactCSSTransitionGroup
      component="ul"
      transitionName="example"
      transitionEnterTimeout={500}
      transitionLeaveTimeout={500}>
      {this.state.cars.map(car => <li key={car.id}>{car.name}</li>)}
    </ReactCSSTransitionGroup>
  )
}

如果您需要随机播放动画，请尝试 react-shuffle - 子组件的动画随机播放

import React, {Component} from 'react';
import Shuffle from 'react-shuffle';

class App extends Component {
  render() {
    return (
      <Shuffle>
        {// Method to render children goes here}
      </Shuffle>
    )
  }
}