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React: Use a local variable in the render() return

24.02.2021 (👁890)

React: Use a local variable in the render() return

This code shows how to use a local variable in a React Componente in the render() / return() function.

After render(), a runtime variable is created;

1)     

    render() {

       

        let breadcrumb_path = "";

 

        return (..

 

 

2)    In the return(..) loop, the variable can then be changed as here in an array.map() function

 

encodeURI(breadcrumb_path = breadcrumb_path + "/" + path)}

 

In Visual Studio: React Component

    //----< render >----

    render() {

        //--------< render(HTML) >--------

        let breadcrumb_path = "";

        return (

            //----< return >----

            <div className="submit-form">

                {

                            //--< IsLoaded >--

                            <div>

                                <div>Folder:&nbsp;

                                 {

(this.state.folder)?.split("/").map(path => (

<>

<a href={this.baseURL + "?f=" + encodeURI(breadcrumb_path = breadcrumb_path + "/" + path)} style={{ margin: '4px' }}>{path}</a>

</>

)

                                        )

                                    }

                                </div>

                            </div>

                            //--</ IsLoaded >--

                }

            </div>

            //----</ return >----

        );

        //--------</ render(HTML) >--------

    }

    //----</ render >----

In the output in the browser

The path of a breadcrumb is extended at run time

 

Mit array.map(path=>( breadcrumb_path = breadcrumb_path + "/" + path))