Show object's value text depending on select option

Question

so I have this issue I am trying to solve, with React.

Let's say I have an object like so:

"options": {
    "open": {
        "text": "Open (Risky)",
        "description": "Filler text for open"
    },

    "wpa": {
       "text": "WPAWPA2PSK (TKIP / AES)",
       "description": "Filler text for wpa"
    },

    "wpa2": {
       "text": "WPA2-PSK (AES) (Recommended)",
       "description": "Filler text for wpa2"
   }
}

And I have it setup that the object's value's "text" is used to populate option values in a select dropdown, like so:

const securityModeOptions = Object.values(securityMode.select.options);

{securityModeOptions.map((mode, index) =>
    <option key={index} value={mode.text}>
        {mode.text}
    </option>
)}

What I would like to do is that whichever option value is selected, it's corresponding "description" is displayed in a div next to it, and the div changes based on whichever option is selected.

Thanks!

Answer 1

You can manage a state of the selected key , then grab the relevant entry from the options object via the key .

Something like this:

 const options = { open: { text: "Open (Risky)", description: "Filler text for open" }, wpa: { text: "WPAWPA2PSK (TKIP / AES)", description: "Filler text for wpa" }, wpa2: { text: "WPA2-PSK (AES) (Recommended)", description: "Filler text for wpa2" } }; class App extends React.Component { state = { selectedOptionKey: "" }; onChange = ({ target }) => { this.setState({ selectedOptionKey: target.value }); }; render() { const { selectedOptionKey } = this.state; const description = options[selectedOptionKey] && options[selectedOptionKey].description; return ( <div> <select onChange={this.onChange}> <option>Choose</option> {Object.entries(options).map(([key, value]) => ( <option value={key}>{value.text}</option> ))} </select> <div>{description}</div> </div> ); } } const rootElement = document.getElementById("root"); ReactDOM.render(<App />, rootElement); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script> <div id="root"/> 

Answer 2

You could keep the key of the selected option in state and show the description of this selected option.

Example

 const options = { open: { text: "Open (Risky)", description: "Filler text for open" }, wpa: { text: "WPAWPA2PSK (TKIP / AES)", description: "Filler text for wpa" }, wpa2: { text: "WPA2-PSK (AES) (Recommended)", description: "Filler text for wpa2" } }; class App extends React.Component { state = { options, selected: Object.keys(options)[0] }; onChange = event => { this.setState({ selected: event.target.value }); }; render() { const { options, selected } = this.state; return ( <div> <select onChange={this.onChange}> {Object.keys(options).map(key => ( <option key={key} value={key}> {options[key].text} </option> ))} </select> <span>{options[selected].description}</span> </div> ); } } ReactDOM.render(<App />, document.getElementById("root")); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script> <div id="root"></div>