我有一个像这样的 json 对象:

let data = {
            UI: {
                "baseType":"App",
                "children":[
                    {
                        "baseType":"TextField",
                        "props":{

                        }
                    }
                ]
            }
        };

我想把它渲染成:

<App>
 <TextField>
 </TextField>

所以，我需要从 json 对象中获取动态渲染的组件。同样，我写了一个方法:

getFromJson(obj) {
    // let Type = obj.baseType;

    let children = obj.children
        ? obj.children.map((obj) => {
                return this.getFromJson(obj,obj.baseType);
            })
        : '';
    // <></
    switch (obj.baseType) {
        case "App":

            return (
                <App key={key} {...obj.props}>
                    {children}
                </App>
            );
        case "TextField":
            //      {children}
            //  </TextField>);
            return (<TextField key={key} {...obj.props}>
                    {children}
                </TextField>
            );
        default:
            return <h1>Returning default case.</h1>;
    }

    // return <div>Hello</div>
}

我正在调用上面的方法:

render() {

        let renderedUI = "";
        if (this.props.json.UI) {
            renderedUI = this.getFromJson(this.props.json.UI, "UI");
        }

        return renderedUI;
    }

输出只是 App 组件，也就是说，子组件不会被渲染。 children 虽然有值(value):{$$typeof: Symbol(react.element), key: "TextField", ref: null, props: {…}, type: ƒ, …}.

我做错了什么？

编辑:我的整个组件是:

import React from "react";
import TextField from "./TextField";
import App from "./App";

export default class RenderFromJson extends React.Component {
    constructor() {
        super();
        this.getFromJson = this.getFromJson.bind(this);
    }

    componentWillMount() {}

    getFromJson(obj,key) {
        // let Type = obj.baseType;

        let children = obj.children
            ? obj.children.map((obj) => {
                    return this.getFromJson(obj,obj.baseType);
                })
            : '';
        // <></
        switch (obj.baseType) {
            case "App":

                return (
                    <App key={key} {...obj.props}>
                        {children}
                    </App>
                );
            case "TextField":
                //      {children}
                //  </TextField>);
                return (<TextField key={key} {...obj.props}>
                        {children}
                    </TextField>
                );
            default:
                return <h1>Returning default case.</h1>;
        }

        // return <div>Hello</div>
    }

    render() {

        let renderedUI = "";
        if (this.props.json.UI) {
            renderedUI = this.getFromJson(this.props.json.UI, "UI");
        }

        return renderedUI;
    }
}

文本字段:

import React from "react";

export default class TextField extends React.Component {
    constructor() {
        super();
    }


    render() {
        console.log("returning from textfield");
        return <h1>Hi from textfield</h1>;
    }
}

App.js

import React from "react";
import axios from "axios";

import RenderFromJson from "./RenderFromJson";

export default class App extends React.Component {
    constructor() {
        super();
    }

    componentWillMount() {}

    render() {

        return <h2>In App</h2>;
    }
}

最佳答案

终于在一小时后我发现了问题，你的 App 组件将在 props 对象中获取 children 数组，你必须将 child 附加到里面你的 App 组件

export default class App extends React.Component {
    constructor() {
        super();
    }

    render() {
        return <div>
            <h1>In App</h1>
            {this.props.children /* this what solve the issue */} 
        </div>
    }
}

关于javascript - 从 json 数据动态渲染 React 组件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48402815/