使用传递给哑组件的方法设置状态

Question

在我的智能组件中，我想使用一些方法来设置智能组件的状态。当用户与哑组件交互时，将触发从智能组件传递下来的方法，从而更改智能组件的状态

在下面的代码中，我希望我的setHighlight将我的state.highlight更改为字符串onClick。clearHighlight具有相同的功能，只是设置了this.state.highlight = null。一旦设置了这个状态，this.state.highlight就被传递给我的PrettyPrintPageSource，以便执行highlightTag中的逻辑。

我的代码目前显示这些错误:

warning.js:44Warning: setState(...): Can only update a mounted or mounting component. This usually means you called setState() on an unmounted component. This is a no-op. Please check the code for the HomePage component.warning @ warning.js:44
warning.js:44Warning: Failed prop type: Required prop `setHighlightTag` was not specified in `TagSummary`.
    in TagSummary (created by HomePage)
    in HomePage (created by Connect(HomePage))
    in Connect(HomePage) (created by RouterContext)
    in div (created by App)
    in MuiThemeProvider (created by App)
    in App (created by RouterContext)
    in RouterContext (created by Router)
    in Router
    in Providerwarning @ warning.js:44
warning.js:44Warning: Failed prop type: Required prop `clearHighlight` was not specified in `TagSummary`.
    in TagSummary (created by HomePage)
    in HomePage (created by Connect(HomePage))
    in Connect(HomePage) (created by RouterContext)
    in div (created by App)
    in MuiThemeProvider (created by App)
    in App (created by RouterContext)
    in RouterContext (created by Router)
    in Router
    in Provider

下面是我的代码:

class HomePage extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            highlight: null
        };
        this.getPageSource = this.getPageSource.bind(this);
        this.updateURLstate = this.updateURLstate.bind(this);
        this.highlightTag = this.highlightTag.bind(this);
        this.clearHighlight = this.clearHighlight(this);
        this.setHighlightTag = this.setHighlightTag(this);
    }
    getPageSource(event) {
        event.preventDefault();
        this.props.actions.getPageSource(this.state.url);
    }
    updateURLstate(event) {
        const url = event.target.value;
        this.setState({
            url
        });
    }
    setHighlightTag(tag) {
        this.setState({
            highlight: tag
        });
    }
    highlightTag(pageSource, tag) {
        if (tag) {
            let re = new RegExp(tag, "g");
            pageSource.replace(re, "<span class='red'>"+ tag +"</span>")
        }
    }
    clearHighlight() {
        this.setState({
            highlight: null
        });
    }
    render() {
        return (
            <div>
                <UrlForm
                    onSearch={ this.getPageSource }
                    onChange={ this.updateURLstate }
                />
                <PrettyPrintPageSource
                    badUrl={ this.props.payload.error }
                    prettyPrintPageSource={ this.props.payload.prettySource }
                    highlighter={ this.highlightTag }
                    tag={ this.state.highlight }
                />
                <TagSummary
                    tags={ this.props.payload.tagData }
                    setHighlightTag={ this.setHighlightTag }
                    clearHighlight={ this.clearHighlight }
                />
            </div>
        );
    }
}

组件:

const TagSummary = ({ tags, setHighlightTag, clearHighlight }) => {
    if (!tags) {
        return <div />;
    }
    return (
        <div>
            {Object.keys(tags).map((tag) => {
                return (
                    <div key={ tag }>
                        <button type="button" onClick={ setHighlightTag.bind(this, tag) }>
                            <pre>&lt;{ tag }&gt;</pre>
                        </button>
                        <p>{ tags[tag] }</p>
                    </div>
                );
            })}
            <button onClick={ clearHighlight }>Clear</button>
        </div>
    );
};

PrettyPrintPageSource哑组件:

const PrettyPrintPageSource = ({ prettyPrintPageSource, badUrl, highlighter, tag }) => {
    if (badUrl) {
        return (
            <div>
                Bad URL!
            </div>
        );
    } else {
        let processedPageSource = highlighter.bind(this, prettyPrintPageSource, tag);
        return (
            <pre>
                { processedPageSource }
            </pre>
        );
    }
};

Answer 1

您忘记绑定clearHighlight和setHighlightTag方法了。修改这些行:

  constructor(){
   ....
   this.clearHighlight = this.clearHighlight.bind(this);
   this.setHighlightTag = this.setHighlightTag.bind(this);
   }