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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <h1>Switchin' It Up</h1>
    
    <select id="js-select-endpoint">
      <option value="users">Users</option>
      <option value="posts">Posts</option>
    </select>

    <select id="js-select-id">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
      <option value="4">4</option>
      <option value="5">5</option>
      <option value="6">6</option>
      <option value="7">7</option>
      <option value="8">8</option>
    </select>
    
    <br>
    <pre id="js-response-box">
      
    </pre>
    <br>
            
          
!

CSS

            
              table {
  padding: 14px;
}
            
          
!

JS

            
              'use strict';

// Helper Method
const ENDPOINT = 'users',
    ROOT     = 'https://jsonplaceholder.typicode.com';

const makeRequest = function makeRequest(path, item) {
return new Promise(function(resolve, reject) {
  // Assumes jQuery
  path ? (path = '/' + path) : path = '/';
  item ? (item = '/' + item) : item = '/';
  const url = ROOT + path + item;
  
  $.getJSON(url)
    .done(function (data) {
      resolve(data);
    })
    .fail(function () {
      reject();
    })
});
};
  
// Code goes here
const select    = document.getElementById('js-select-endpoint'),
    id_select = document.getElementById('js-select-id'),
    response_box = document.getElementById('js-response-box');

// STREAM of button clicks on ENDPOINT selection
const endpoint_stream = 
  Rx.Observable.fromEvent(select, 'click').
    map(event  => event.target).
    map(target => (target.options[target.selectedIndex].text.toLowerCase()));


const id_stream = 
  Rx.Observable.fromEvent(id_select, 'click').
    map(event  => event.target).
    map(target => (target.options[target.selectedIndex].text.toLowerCase()));
    
const request_stream  = 
  // To wait until BOTH fields get updated, use zip:
  //   endpoint_stream.zip(id_stream) 
  endpoint_stream.combineLatest(id_stream).
    // Emits ARRAY: First element is from endpoint_stream, second is from id_stream
    map(data => makeRequest(data[0], data[1]))
    // Only hit server for DIFFERENT requests
    .distinctUntilChanged()
    // Take only the last selections made every second
    .debounce(1000)
    // Listen to the most RECENT selection
    .switch()
    .subscribe(response => {
      response_box.innerHTML = JSON.stringify(response, null, 2);
    })
            
          
!
999px

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