js select option code example

Example 1: javascript get selected option

var e = document.getElementById("selectElementID");
var value=e.selectElement.options[e.selectedIndex].value;// get selected option value
var text=e.options[e.selectedIndex].text;//get the selected option text

Example 2: javascript get all select options

var options = document.getElementById('mySelectID').options;
for (let i = 0; i < options.length; i++) { 
  console.log(options[i].value);//log the value
}

Example 3: make select option selected javascript

document.getElementById('personlist').getElementsByTagName('option')[11].selected = 'selected'

Example 4: js select option in form

<form name="AddAndEdit">
   <select name="list" id="personlist">
      <option value="P1">Person1</option>
      <option value="P2">Person2</option>
      <option value="P3">Person3</option>
   </select>
</form>

Example 5: options in html

<form id="form">
            <label for=""></label>
            <br>
            <input type="" id="">
            <br>
            <label for=""></label>
            <br>
            <input list="browsers" name="Thenicknamey" id="Thenickname">
            <datalist id="browsers">
                <option value=""></option>
                <option value=""></option>
                <option value=""></option>
            </datalist>
            <br>
            <label for=""></label>
            <br>
            <input type="" id="">
            <br>
            <input type="" id="">
        </form>

Example 6: javascript option

/* assuming we have the following HTML
<select id="s">
    <option>First</option>
    <option>Second</option>
    <option>Third</option>
</select>
*/ 

var s = document.getElementById('s');
var options = [ 'zero', 'one', 'two' ];

options.forEach(function(element, key) {
  if (element == 'zero') {
    s[s.options.length] = new Option(element, s.options.length, false, false);
  }                
  if (element == 'one') {
    s[s.options.length] = new Option(element, s.options.length, true, false); // Will add the "selected" attribute    
  }
  if (element == 'two') {
    s[s.options.length] = new Option(element, s.options.length, false, true); // Just will be selected in "view"
  }
});

/* Result
<select id="s">
  <option value="0">zero</option>
  <option value="1" selected="">one</option>
  <option value="2">two</option> // User will see this as 'selected'
</select>
*/