// combobox.js
// External Javascript to extend some HTML like combobox.html allowing for a dynamically created HTML div element "combobox" (ie. dropdown + div contenteditable=true)
// November, 2020
// Called via ...
//      <script type='text/javascript' src='combobox.js' defer></script>
//   ... or dropdown populated example as per ...
//      <script type='text/javascript' src='combobox.js?ddlist=Asia,Africa,Europe,North%20America,South%20America,Australia,Antarctica' defer></script>

class Droptext {
  constructor(combobox) {
    this.ele = document.createElement('div');
    this.ele.id = ('' + combobox).split(';')[0];
    if (('' + combobox).indexOf(';') != -1) {
      this.ele.setAttribute('data-dropinnards',  ('' + combobox).split(';')[1]);
      this.ele.setAttribute('data-optionval',  "<option value=''></option>");
      this.ele.setAttribute('data-focusaway',  "<input style=position:absolute;top:-200px;left:-200px; type=text value=></input>");
      this.ele.setAttribute('contenteditable', true);
      this.ele.innerHTML = ('' + combobox).split(';')[1]; // + "<input style=position:absolute;top:-200px;left:-200px; type=text value=></input>"; 
    }
  }
  present() {
    return this.ele.outerHTML.replace('><select', ' onblur=" var odiv=event.target;  var optval=event.target.getAttribute(' + "'" + 'data-optionval' + "'" + ');  var fway=event.target.getAttribute(' + "'" + 'data-focusaway' + "'" + ');  var umytype=event.target.innerHTML;  var alltogether=event.target.getAttribute(' + "'" + 'data-dropinnards' + "'" + ').split(String.fromCharCode(60) + ' + "'" + '/select' + "'" + ')[0]; if (umytype.trim().length == 0) {   odiv.innerHTML = event.target.getAttribute(' + "'" + 'data-dropinnards' + "'" + '); } else if (alltogether.indexOf(String.fromCharCode(62) + umytype + String.fromCharCode(60)) != -1) {   odiv.innerHTML = alltogether.replace(String.fromCharCode(62) + umytype + String.fromCharCode(60), ' + "' selected'" + ' + String.fromCharCode(62) + umytype + String.fromCharCode(60)) + event.target.getAttribute(' + "'" + 'data-focusaway' + "'" + ');   } else {  alltogether+=optval.replace(String.fromCharCode(39),  String.fromCharCode(39) + umytype).replace(String.fromCharCode(62), String.fromCharCode(62) + umytype);  alltogether+=String.fromCharCode(60) + ' + "'" + '/select' + "'" + ' + String.fromCharCode(62); odiv.innerHTML = fway; odiv.innerHTML = alltogether.replace(String.fromCharCode(62) + umytype + String.fromCharCode(60), ' + "' selected'" + ' + String.fromCharCode(62) + umytype + String.fromCharCode(60)) + event.target.getAttribute(' + "'" + 'data-focusaway' + "'" + '); odiv.setAttribute(' + "'" + 'data-dropinnards' + "'" + ',alltogether); }  " onkeypress=" event.target.setAttribute(' + "'" + 'data-sofar' + "'" + ', event.target.innerHTML); " onkeydown="  if (event.target.innerHTML.indexOf(String.fromCharCode(60)) != -1) { event.target.innerHTML=' + "''" + ';  } "><select');
  }
}

class Contents extends Droptext {
  constructor(combobox, mod) {
    if (('' + combobox) == '') {
      var iinn=0;
      while (document.getElementById('combobox' + iinn)) {
        iinn++;
      }
      combobox = 'combobox' + iinn;
    }
    super((combobox + ';' + mod));
    this.dropinnards = mod;
  }
  show() {
    return this.present() + "<input style=position:absolute;top:-200px;left:-200px; type=text value=></input>"; // + ', it is a ' + this.dropinnards;
  }
}

var ihs = "";
var selconts = location.search.split('ddlist=')[1] ? (ihs + decodeURIComponent(location.search.split('ddlist=')[1].split('&')[0])).split(',') : (ihs + "<select><option value=''></option><option value='Red'>Red</option><option value='Blue'>Blue</option><option value='Yellow'>Yellow</option></select>").split(',');
if (document.head.innerHTML.replace('&ddlist=','?ddlist=').indexOf('?ddlist=') != -1) {
  ihs = decodeURIComponent(document.head.replace('&ddlist=','?ddlist=').innerHTML.split('?ddlist=')[1].split('&')[0].split('"')[0].split("'")[0]); // + ',';
  if (ihs.trim() != '') { selconts = ihs.split(','); }
}
if (selconts[0].indexOf('<select') != 0) {
 var selcont = "<select>";
 for (var jiip=0; jiip<selconts.length; jiip++) {
  if (selconts[jiip].indexOf('<select') != 0) {
    selcont += '<option value="' + selconts[jiip] + '">' + selconts[jiip] + '</option>';
  }
 }
 selcont += "</select>";
 mycombobox = new Contents("", selcont);
} else {
 mycombobox = new Contents("", selconts[0]);
}
var obody = document.body;
if (document.getElementById('demo')) {
  obody = document.getElementById('demo');
} else {
  var ofound = false;
  var obs = document.getElementsByTagName('div');
  for (var iip=0; iip<obs.length; iip++) {
    if (obs[iip].innerHTML == '') { 
     obody = obs[iip]; 
     ofound = true;
    }
  }
  if (!ofound) {
    obody.innerHTML += '<div id=demo></div>';
    obody = document.getElementById('demo');
  }
}
obody.innerHTML += mycombobox.show();