Ho un elenco a discesa come questo:

<select id="box1">
<option value="98">dog</option>
<option value="7122">cat</option>
<option value="142">bird</option>
</select>

Come posso ottenere il testo effettivo dell'opzione anziché il valore utilizzando JavaScript? Posso ottenere il valore con qualcosa come:

<select id="box1" onChange="myNewFunction(this.selectedIndex);" >

Ma piuttosto che 7122voglio cat.

Prova le opzioni

function myNewFunction(sel) {
  alert(sel.options[sel.selectedIndex].text);
}

<select id="box1" onChange="myNewFunction(this);">
  <option value="98">dog</option>
  <option value="7122">cat</option>
  <option value="142">bird</option>
</select>

JavaScript normale

var sel = document.getElementById("box1");
var text= sel.options[sel.selectedIndex].text;

jQuery:

$("#box1 option:selected").text();

Tutte queste funzioni e cose casuali, penso che sia meglio usarle e farlo in questo modo:

this.options[this.selectedIndex].text

HTML:

<select id="box1" onChange="myNewFunction(this);">

JavaScript:

function myNewFunction(element) {
    var text = element.options[element.selectedIndex].text;
    // ...
}

DEMO: http://jsfiddle.net/6dkun/1/

Uso -

$.trim($("select").children("option:selected").text())   //cat

Ecco il violino - http://jsfiddle.net/eEGr3/

Avrai bisogno di ottenere l'hTML interno dell'opzione e non il suo valore.

Usa this.innerHTMLinvece di this.selectedIndex.

Modifica: dovrai prima ottenere l'elemento option e quindi utilizzare innerHTML.

Usa this.textinvece di this.selectedIndex.

 <select class="cS" onChange="fSel2(this.value);">
     <option value="0">S?lectionner</option>
     <option value="1">Un</option>
     <option value="2" selected>Deux</option>
     <option value="3">Trois</option>
 </select>

 <select id="iS1" onChange="fSel(options[this.selectedIndex].value);">
     <option value="0">S?lectionner</option>
     <option value="1">Un</option>
     <option value="2" selected>Deux</option>
     <option value="3">Trois</option>
 </select><br>

 <select id="iS2" onChange="fSel3(options[this.selectedIndex].text);">
     <option value="0">S?lectionner</option>
     <option value="1">Un</option>
     <option value="2" selected>Deux</option>
     <option value="3">Trois</option>
 </select>

 <select id="iS3" onChange="fSel3(options[this.selectedIndex].textContent);">
     <option value="0">S?lectionner</option>
     <option value="1">Un</option>
     <option value="2" selected>Deux</option>
     <option value="3">Trois</option>
 </select>

 <select id="iS4" onChange="fSel3(options[this.selectedIndex].label);">
     <option value="0">S?lectionner</option>
     <option value="1">Un</option>
     <option value="2" selected>Deux</option>
     <option value="3">Trois</option>
 </select>

 <select id="iS4" onChange="fSel3(options[this.selectedIndex].innerHTML);">
     <option value="0">S?lectionner</option>
     <option value="1">Un</option>
     <option value="2" selected>Deux</option>
     <option value="3">Trois</option>
 </select>

 <script type="text/javascript"> "use strict";
   const s=document.querySelector(".cS");

 // options[this.selectedIndex].value
 let fSel = (sIdx) => console.log(sIdx,
     s.options[sIdx].text, s.options[sIdx].textContent, s.options[sIdx].label);

 let fSel2= (sIdx) => { // this.value
     console.log(sIdx, s.options[sIdx].text,
         s.options[sIdx].textContent, s.options[sIdx].label);
 }

 // options[this.selectedIndex].text
 // options[this.selectedIndex].textContent
 // options[this.selectedIndex].label
 // options[this.selectedIndex].innerHTML
 let fSel3= (sIdx) => {
     console.log(sIdx);
 }
 </script> // fSel

Ma :

 <script type="text/javascript"> "use strict";
    const x=document.querySelector(".cS"),
          o=x.options, i=x.selectedIndex;
    console.log(o[i].value,
                o[i].text , o[i].textContent , o[i].label , o[i].innerHTML);
 </script> // .cS"

E anche questo:

 <select id="iSel" size="3">
     <option value="one">Un</option>
     <option value="two">Deux</option>
     <option value="three">Trois</option>
 </select>


 <script type="text/javascript"> "use strict";
    const i=document.getElementById("iSel");
    for(let k=0;k<i.length;k++) {
        if(k == i.selectedIndex) console.log("Selected ".repeat(3));
        console.log(`${Object.entries(i.options)[k][1].value}`+
                    ` => ` +
                    `${Object.entries(i.options)[k][1].innerHTML}`);
        console.log(Object.values(i.options)[k].value ,
                    " => ",
                    Object.values(i.options)[k].innerHTML);
        console.log("=".repeat(25));
    }
 </script>

Ci sono due soluzioni, per quanto ne so.

entrambi hanno solo bisogno di usare javascript vaniglia

1 selezionatoOpzioni

dimostrazione dal vivo

const log = console.log;
const areaSelect = document.querySelector(`[id="area"]`);

areaSelect.addEventListener(`change`, (e) => {
  // log(`e.target`, e.target);
  const select = e.target;
  const value = select.value;
  const desc = select.selectedOptions[0].text;
  log(`option desc`, desc);
});

<div class="select-box clearfix">
  <label for="area">Area</label>
  <select id="area">
    <option value="101">A1</option>
    <option value="102">B2</option>
    <option value="103">C3</option>
  </select>
</div>

2 opzioni

dimostrazione dal vivo

const log = console.log;
const areaSelect = document.querySelector(`[id="area"]`);

areaSelect.addEventListener(`change`, (e) => {
  // log(`e.target`, e.target);
  const select = e.target;
  const value = select.value;
  const desc = select.options[select.selectedIndex].text;
  log(`option desc`, desc);
});

<div class="select-box clearfix">
  <label for="area">Area</label>
  <select id="area">
    <option value="101">A1</option>
    <option value="102">B2</option>
    <option value="103">C3</option>
  </select>
</div>

Prova quanto segue:

myNewFunction = function(id, index) {
    var selection = document.getElementById(id);
    alert(selection.options[index].innerHTML);
};

Vedi qui jsfiddle esempio