Javascript 我应该如何实现将状态保存到本地存储?
代码:Javascript 我应该如何实现将状态保存到本地存储?,javascript,reactjs,Javascript,Reactjs,代码: var React = require('react'); var Recipe = require('./Recipe.jsx'); var AddRecipe = require('./AddRecipe.jsx'); var EditRecipe = require('./EditRecipe.jsx'); var RecipeBox = React.createClass({ getInitialState: function () { return
var React = require('react');
var Recipe = require('./Recipe.jsx');
var AddRecipe = require('./AddRecipe.jsx');
var EditRecipe = require('./EditRecipe.jsx');
var RecipeBox = React.createClass({
getInitialState: function () {
return {
recipesArray: [],
adding: false,
editing: false,
currentIndex: 0
};
},
handleClick: function () {
this.setState({
adding: true
});
},
handleEditClick: function(index) {
this.setState({
editing: true,
currentIndex: index
});
},
handleDeleteClick: function(index) {
var newRecipesArray = this.state.recipesArray;
newRecipesArray.splice(index-1,1);
this.setState({
recipesArray: newRecipesArray
});
},
handleClose: function() {
this.setState({
adding: false,
editing: false
});
},
handleAdd: function(newRecipe) {
this.setState({
recipesArray: this.state.recipesArray.concat(newRecipe)
});
},
handleEdit: function(newRecipe, index) {
var newRecipesArray = this.state.recipesArray;
newRecipesArray[index-1] = newRecipe;
this.setState({
recipesArray: newRecipesArray
});
},
render: function() {
var i = 0;
var that = this;
var recipes = this.state.recipesArray.map(function(item) {
i++
return (
<div key={"div"+i} className="table">
<Recipe key={i} name={item.name} ingredients={item.ingredients} />
<button key ={"edit"+i} onClick={() => { that.handleEditClick(i)}} className="btn edit btn-primary">Edit</button>
<button key ={"delete"+i} onClick={() => { that.handleDeleteClick(i)}} className="btn delete btn-danger">Delete</button>
</div>
);
});
return (
<div>
<h1>React.js Recipe Box</h1>
<button className="btn btn-primary" onClick={this.handleClick}>Add Recipe</button>
<table>
<tbody>
<tr>
<th>RECIPES</th>
</tr>
</tbody>
</table>
{recipes}
{ this.state.adding ? <AddRecipe handleClose={this.handleClose} handleAdd={this.handleAdd} /> : null }
{ this.state.editing ? <EditRecipe currentIndex = {this.state.currentIndex} handleClose={this.handleClose} handleEdit={this.handleEdit}/> : null }
</div>
);
},
});
module.exports = RecipeBox;
var React=require('React');
var Recipe=require('./Recipe.jsx');
var AddRecipe=require('./AddRecipe.jsx');
var EditRecipe=require('./EditRecipe.jsx');
var RecipeBox=React.createClass({
getInitialState:函数(){
返回{
阵列:[],
加:错,
编辑:错,
当前索引:0
};
},
handleClick:函数(){
这是我的国家({
加:对
});
},
HandleEdit单击:函数(索引){
这是我的国家({
编辑:对,,
当前索引:索引
});
},
handleDeleteClick:函数(索引){
var newRecipesArray=this.state.recipesArray;
NewRecipes阵列拼接(索引-1,1);
这是我的国家({
recipesArray:newRecipesArray
});
},
handleClose:function(){
这是我的国家({
加:错,
编辑:假
});
},
handleAdd:函数(新配方){
这是我的国家({
recipesArray:this.state.recipesArray.concat(newRecipe)
});
},
handleEdit:函数(新配方、索引){
var newRecipesArray=this.state.recipesArray;
NewRecipes数组[index-1]=newRecipe;
这是我的国家({
recipesArray:newRecipesArray
});
},
render:function(){
var i=0;
var=这个;
var recipes=this.state.recipesArray.map(函数(项){
我++
返回(
{that.handleEditClick(i)}className=“btn edit btn primary”>编辑
{that.handleDeleteClick(i)}className=“btn delete btn danger”>删除
);
});
返回(
React.js配方盒
添加配方
食谱
{配方}
{this.state.adding?:null}
{this.state.editing?:null}
);
},
});
module.exports=RecipeBox;
问题:
var React = require('react');
var Recipe = require('./Recipe.jsx');
var AddRecipe = require('./AddRecipe.jsx');
var EditRecipe = require('./EditRecipe.jsx');
var RecipeBox = React.createClass({
getInitialState: function () {
return {
recipesArray: [],
adding: false,
editing: false,
currentIndex: 0
};
},
handleClick: function () {
this.setState({
adding: true
});
},
handleEditClick: function(index) {
this.setState({
editing: true,
currentIndex: index
});
},
handleDeleteClick: function(index) {
var newRecipesArray = this.state.recipesArray;
newRecipesArray.splice(index-1,1);
this.setState({
recipesArray: newRecipesArray
});
},
handleClose: function() {
this.setState({
adding: false,
editing: false
});
},
handleAdd: function(newRecipe) {
this.setState({
recipesArray: this.state.recipesArray.concat(newRecipe)
});
},
handleEdit: function(newRecipe, index) {
var newRecipesArray = this.state.recipesArray;
newRecipesArray[index-1] = newRecipe;
this.setState({
recipesArray: newRecipesArray
});
},
render: function() {
var i = 0;
var that = this;
var recipes = this.state.recipesArray.map(function(item) {
i++
return (
<div key={"div"+i} className="table">
<Recipe key={i} name={item.name} ingredients={item.ingredients} />
<button key ={"edit"+i} onClick={() => { that.handleEditClick(i)}} className="btn edit btn-primary">Edit</button>
<button key ={"delete"+i} onClick={() => { that.handleDeleteClick(i)}} className="btn delete btn-danger">Delete</button>
</div>
);
});
return (
<div>
<h1>React.js Recipe Box</h1>
<button className="btn btn-primary" onClick={this.handleClick}>Add Recipe</button>
<table>
<tbody>
<tr>
<th>RECIPES</th>
</tr>
</tbody>
</table>
{recipes}
{ this.state.adding ? <AddRecipe handleClose={this.handleClose} handleAdd={this.handleAdd} /> : null }
{ this.state.editing ? <EditRecipe currentIndex = {this.state.currentIndex} handleClose={this.handleClose} handleEdit={this.handleEdit}/> : null }
</div>
);
},
});
module.exports = RecipeBox;
我应该如何实现将状态保存到本地存储?
最优雅的实现是什么
目前正在学习React并希望编写干净优雅的代码。我想看一看使本地存储更容易的插件(不是特定于浏览器的)。例如:
上面的页面包含了开始时所需的所有信息。如果这个不行,我会继续搜索。外面有很多。也可能有使用React的更新版本。当我学习/做Angular时,jQuery插件为我工作。每当启动状态更新时,它都会触发
componentDidUpdate的生命周期方法。可以挂接到该方法中以保存组件的状态
componentDidUpdate() {
window.localStorage.setItem('state', JSON.stringify(this.state));
}
根据您的用例,您应该能够将其加载到componentDidMount
上
componentDidMount() {
// there is a chance the item does not exist
// or the json fails to parse
try {
const state = window.localStorage.getItem('state');
this.setState({ ...JSON.parse(state) });
} catch (e) {}
}
我要警告你,你可能想要一个更像“成熟”解决方案的解决方案。这一个在几个方面都很脆弱。为什么要投否决票?如有必要,我愿意编辑我的问题。请解释一下,他们投了反对票,因为你真的没有说你想说什么。您输入了代码,但没有输入您尝试的本地存储或任何问题。一般来说,你会被否决。@webdad3是有意义的。虽然这段代码可能会回答这个问题,但提供关于如何和/或为什么解决这个问题的额外上下文将提高答案的长期价值。