我正在尝试在类似父类的组件<Block1>
中加载不同的React组件。
我想要实现的是,当我按下&#34; next&#34; 按钮<Button1>
时,<Component2>
必须在<Block1>
内加载并且&#34; next&#34; 按钮应更改为&#34;之前的&#34; ,但点击&#34;之前&#34 ; <Button2>
必须加载<Component1>
。
我不想使用<Block2>
。如您所见,我在这里写了很多冗余代码。有没有办法只在按钮点击时更改<Block1>
内的组件?
var Block1 = React.createClass({
render: function(){
return(
<div className="block">
<Component1/>
<Button1/>
</div>
)
}
});
var Component1 = React.createClass({
render: function(){
return(
<p className = "component1">This is Component1</p>
)
}
});
var Button1 = React.createClass({
next: function(){
ReactDOM.render(<Block2/>, document.getElementById("container"));
},
render: function(){
return(
<button className = "button1" onClick = {this.next}>Next</button>
)
}
});
var Block2 = React.createClass({
render: function(){
return(
<div className="block">
<Component2/>
<Button2/>
</div>
)
}
});
var Component2 = React.createClass({
render: function(){
return(
<p className = "component2">This is Component2</p>
)
}
});
var Button2 = React.createClass({
previous: function(){
ReactDOM.render(<Block1/>, document.getElementById("container"));
},
render: function(){
return(
<button className = "button1" onClick = {this.previous}>previous</button>
)
}
});
ReactDOM.render(<Block1/>, document.getElementById("container"));
答案 0 :(得分:2)
您绝对不想在组件结构中的任何其他位置使用ReactDOM.render
。
看起来你正在创建一个&#34;向导&#34;有几个不同的步骤。
我编辑了你的小提琴:https://jsfiddle.net/guq81pa9/1/
顶级组件会跟踪哪个&#39;步骤&#39;你继续,并处理来回切换:
var Block = React.createClass({
getInitialState: function(){
return {
step: 1
}
},
goto: function(step){
this.setState({
step: step || 1 // default to step 1
})
},
render: function(){
var renderStep = <div className="block component1">
<Component1/>
<Button onClick={this.goto.bind(this,2)}>Next</Button>
</div>
if (this.state.step === 2) {
renderStep = <div className="block component2">
<Component2/>
<Button onClick={this.goto.bind(this,1)}>Previous</Button>
</div>
}
return renderStep
}
});
答案 1 :(得分:1)
是否有办法仅在按钮点击时更改
<Block1>
内的组件?
是。
解决这个问题的一种方法是让主要顶级组件<Block1>
或者称之为<MainBlock>
,是一个有状态组件,它维护状态并驱动决定渲染内容的逻辑。其他组件可能只是根据<MainBlock>
设置的状态标志呈现的无状态表示组件。
基本上,<MainBlock>
有一个状态标志,比方说isShowingNext
,它用于确定哪个部分(“下一个”或“前一个”)被渲染,并且该标志由被调用的动作设置从按钮。
就按钮本身而言,它们附有onClick侦听器,无论何时单击,都会调用<MainBlock>
中的动作并<MainBlock>
更新状态标志并重新呈现正确的组件。
由于按钮几乎相同,我们可以将它们组合成单个按钮组件,例如<ToggleButton>
,它将根据传递的标志有条件地呈现(“上一个”或“下一个”)(参见< strong>第一种方法)。
根据您的使用情况,如果按钮(及其渲染逻辑)不相似,您可以使用其中两个,例如<ButtonPrev>
和<ButtonNext>
,其中一个或另一个由<MainBlock>
呈现,具体取决于州旗(请参阅第二种方法)。
var MainBlock = React.createClass({
// initially we are showing the "previous" page
getInitialState() {
return {
isShowingNext: false
};
},
// action that updates the state flag to determine what gets rendered
handleUpdateIsShowingNext: function(isShowingNext) {
this.setState({
isShowingNext: isShowingNext
});
},
// render function that displays the proper template based on the state flag
render: function(){
var isShowingNext = this.state.isShowingNext;
return (
<div className="block">
{isShowingNext ? <ComponentNext/> : <ComponentPrev/>}
<ToggleButton isShowingNext={isShowingNext}
onUpdateIsShowingNext={this.handleUpdateIsShowingNext}
/>
</div>
);
}
});
// button for that toggles between "previous" or "next" page depending on the logic
var ToggleButton = React.createClass({
toggle: function(){
this.props.onUpdateIsShowingNext(!this.props.isShowingNext); // toggle the "isShowingNext" flag
},
render: function(){
var isShowingNext = this.props.isShowingNext;
if (isShowingNext) {
return <button className="button-prev" onClick={this.toggle}>Prev</button>;
} else {
return <button className="button-next" onClick={this.toggle}>Next</button>;
}
}
});
// representational component for the "previous" page
var ComponentPrev = React.createClass({
render: function(){
return <p className = "component-prev">This is ComponentPrev</p>;
}
});
// representational component for the "next" page
var ComponentNext = React.createClass({
render: function(){
return <p className = "component-next">This is ComponentNext</p>;
}
});
ReactDOM.render(<MainBlock/>, document.getElementById("container"));
var MainBlock = React.createClass({
// initially we are showing the "previous" page
getInitialState() {
return {
isShowingNext: false
};
},
// returns the template for the "previous" page
getTemplateForPrev: function() {
return (
<div className="block">
<ComponentPrev/>
<ButtonPrev onUpdateIsShowingNext={this.handleUpdateIsShowingNext}/>
</div>
);
},
// returns the template for the "next" page
getTemplateForNext: function() {
return (
<div className="block">
<ComponentNext/>
<ButtonNext onUpdateIsShowingNext={this.handleUpdateIsShowingNext}/>
</div>
);
},
// action that updates the state flag to determine what gets rendered
handleUpdateIsShowingNext: function(isShowingNext) {
this.setState({
isShowingNext: isShowingNext
});
},
// render function that displays the proper template based on the state flag
render: function(){
return this.state.isShowingNext ? this.getTemplateForNext() : this.getTemplateForPrev();
}
});
// representational component for the "previous" page
var ComponentPrev = React.createClass({
render: function(){
return <p className = "component-prev">This is ComponentPrev</p>;
}
});
// button for the "previous" page
var ButtonPrev = React.createClass({
next: function(){
this.props.onUpdateIsShowingNext(true); // clicking "previous" makes isShowingNext be true
},
render: function(){
return <button className="button-prev" onClick={this.next}>Next</button>;
}
});
// representational component for the "next" page
var ComponentNext = React.createClass({
render: function(){
return <p className = "component-next">This is ComponentNext</p>;
}
});
// button for the "next" page
var ButtonNext = React.createClass({
previous: function(){
this.props.onUpdateIsShowingNext(false); // clicking "previous" makes isShowingNext be false
},
render: function(){
return <button className="button-next" onClick={this.previous}>previous</button>;
}
});
ReactDOM.render(<MainBlock/>, document.getElementById("container"));