How do I create a dynamic drop down list with react-bootstrap

bind dynamic drop using arrow function.

class BindDropDown extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      values: [
        { name: 'One', id: 1 },
        { name: 'Two', id: 2 },
        { name: 'Three', id: 3 },
        { name: 'four', id: 4 }
      ]
    };
  }
  render() {
    let optionTemplate = this.state.values.map(v => (
      <option value={v.id}>{v.name}</option>
    ));

    return (
      <label>
        Pick your favorite Number:
        <select value={this.state.value} onChange={this.handleChange}>
          {optionTemplate}
        </select>
      </label>
    );
  }
}

ReactDOM.render(
  <BindDropDown />,
  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">
    <!-- This element's contents will be replaced with your component. -->
</div>

// on component load, load this list of values
// or we can get this details from api call also    
const animalsList = [
{
    id: 1,
    value: 'Tiger'
}, {
    id: 2,
    value: 'Lion'
}, {
    id: 3,
    value: 'Dog'
}, {
    id: 4,
    value: 'Cat'
}
];

// generage select dropdown option list dynamically
function Options({ options }) {
    return (
        options.map(option => 
                    <option key={option.id} value={option.value}>                                   
                    {option.value}
                    </option>)
                   );
}

<select
name="animal"
className="form-control">
<Options options={animalsList} />
</select>

Basically all you need to do, is to map array. This will return a list of <option> elements, which you can place inside form to render.

array.map((element, index) => <option key={index}>{element}</option>)

Complete function component, that renders <option>s from array saved in component's state. Multiple property let's you CTRL-click many elements to select. Remove it, if you want dropdown menu.

import React, { useState } from "react";

const ExampleComponent = () => {
    const [options, setOptions] = useState(["option 1", "option 2", "option 3"]);

    return (
        <form>
            <select multiple>
            { options.map((element, index) => <option key={index}>{element}</option>) }
            </select>
            <button>Add</button>
        </form>
    );
}

component with multiple select

Working example: https://codesandbox.io/s/blue-moon-rt6k6?file=/src/App.js

You can create dynamic select options by map()

Example code

return (
    <select className="form-control"
            value={this.state.value}
            onChange={event => this.setState({selectedMsgTemplate: event.target.value})}>
        {
            templates.map(msgTemplate => {
                return (
                    <option key={msgTemplate.id} value={msgTemplate.text}>
                        Select one...
                    </option>
                )
            })
        }
    </select>
)
  </label>
);

I was able to do this using Typeahead. It looks bit lengthy for a simple scenario but I'm posting this as it will be helpful for someone.

First I have created a component so that it is reusable.

interface DynamicSelectProps {
    readonly id: string
    readonly options: any[]
    readonly defaultValue: string | null
    readonly disabled: boolean
    onSelectItem(item: any): any
    children?:React.ReactNode
}

export default function DynamicSelect({id, options, defaultValue, onSelectItem, disabled}: DynamicSelectProps) {

    const [selection, setSelection] = useState<any[]>([]);

    return <>
        <Typeahead
            labelKey={option => `${option.key}`}
            id={id}
            onChange={selected => {
                setSelection(selected)
                onSelectItem(selected)
            }}
            options={options}
            defaultInputValue={defaultValue || ""}
            placeholder="Search"
            selected={selection}
            disabled={disabled}
        />
    </>
}

Callback function

function onSelection(selection: any) {
    console.log(selection)
    //handle selection
}

Usage

<div className="form-group">
    <DynamicSelect
        options={array.map(item => <option key={item} value={item}>{item}</option>)}
        id="search-typeahead"
        defaultValue={<default-value>}
        disabled={false}
        onSelectItem={onSelection}>
    </DynamicSelect>
</div>