aboutsummaryrefslogtreecommitdiff
path: root/files/ko/web/api/htmlselectelement/selectedoptions/index.html
blob: da8993f4cf40996ee566612634b44d63c11e237a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
---
title: HTMLSelectElement.selectedOptions
slug: Web/API/HTMLSelectElement/selectedOptions
translation_of: Web/API/HTMLSelectElement/selectedOptions
---
<p>{{APIRef("HTML DOM")}}</p>

<p>The <strong>read-only</strong> {{domxref("HTMLSelectElement")}} property <code><strong>selectedOptions</strong></code> contains a list of the {{HTMLElement("option")}} elements contained within the {{HTMLElement("select")}} element that are currently selected. The list of selected options is an {{domxref("HTMLCollection")}} object with one entry per currently selected option.</p>

<p>An option is considered selected if it has an {{domxref("HTMLOptionElement.selected")}} attribute.</p>

<h2 id="Syntax">Syntax</h2>

<pre class="syntaxbox">var <em>selectedCollection</em> = <em>HTMLSelectElement</em>.selectedOptions;</pre>

<h3 id="Value">Value</h3>

<p>An {{domxref("HTMLCollection")}} which lists every currently selected {{domxref("HTMLOptionElement")}} which is either a child of the {{domxref("HTMLSelectElement")}} or of an {{domxref("HTMLOptGroupElement")}} within the <code>&lt;select&gt;</code> element.</p>

<p>In other words, any option contained within the <code>&lt;select&gt;</code> element may be part of the results, but option groups are not included in the list.</p>

<p>If no options are currently selected, the collection is empty and returns a {{domxref("HTMLCollection.length", "length")}} of 0.</p>

<h2 id="Example">Example</h2>

<p>In this example, a {{HTMLElement("select")}} element with a number of options is used to let the user order various food items.</p>

<h3 id="HTML">HTML</h3>

<p>The HTML that creates the selection box and the {{HTMLElement("option")}} elements representing each of the food choices looks like this:</p>

<pre class="brush: html">&lt;label for="foods"&gt;What do you want to eat?&lt;/label&gt;&lt;br&gt;
&lt;select id="foods" name="foods" size="7" multiple&gt;
  &lt;option value="1"&gt;Burrito&lt;/option&gt;
  &lt;option value="2"&gt;Cheeseburger&lt;/option&gt;
  &lt;option value="3"&gt;Double Bacon Burger Supreme&lt;/option&gt;
  &lt;option value="4"&gt;Pepperoni Pizza&lt;/option&gt;
  &lt;option value="5"&gt;Taco&lt;/option&gt;
&lt;/select&gt;
&lt;br&gt;
&lt;button name="order" id="order"&gt;
  Order Now
&lt;/button&gt;
&lt;p id="output"&gt;
&lt;/p&gt;</pre>

<p>The <code>&lt;select&gt;</code> element is set to allow multiple items to be selected, and it is 7 rows tall. Note also the {{HTMLElement("button")}}, whose role it is to trigger fetching the {{domxref("HTMLCollection")}} of selected elements using the <code>selected</code> property.</p>

<h3 id="JavaScript">JavaScript</h3>

<p>The JavaScript code that establishes the event handler for the button, as well as the event handler itself, looks like this:</p>

<pre class="brush: js">let orderButton = document.getElementById("order");
let itemList = document.getElementById("foods");
let outputBox = document.getElementById("output");

orderButton.addEventListener("click", function() {
  let collection = itemList.selectedOptions;
  let output = "";

  for (let i=0; i&lt;collection.length; i++) {
    if (output === "") {
      output = "Your order for the following items has been placed: ";
    }
    output += collection[i].label;

    if (i === (collection.length - 2) &amp;&amp; (collection.length &lt; 3)) {
      output +=  " and ";
    } else if (i &lt; (collection.length - 2)) {
      output += ", ";
    } else if (i === (collection.length - 2)) {
      output += ", and ";
    }
  }

  if (output === "") {
    output = "You didn't order anything!";
  }

  outputBox.innerHTML = output;
}, false);</pre>

<p>This script sets up a {{event("click")}} event listener on the "Order Now" button. When clicked, the event handler fetches the list of selected options using <code>selectedOptions</code>, then iterates over the options in the list. A string is constructed to list the ordered items, with logic to build the list using proper English grammar rules (including a {{interwiki("wikipedia", "serial comma")}}).</p>

<h3 id="Result">Result</h3>

<p>The resulting content looks like this in action:</p>

<p>{{EmbedLiveSample("Example", 600, 250)}}</p>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('HTML WHATWG', "form-elements.html#dom-select-selectedoptions", "HTMLSelectElement.selectedOptions")}}</td>
   <td>{{Spec2('HTML WHATWG')}}</td>
   <td>No change from {{SpecName('HTML5 W3C')}}</td>
  </tr>
  <tr>
   <td>{{SpecName('HTML5 W3C', "forms.html#dom-select-selectedoptions", "HTMLSelectElement.selectedOptions")}}</td>
   <td>{{Spec2('HTML5 W3C')}}</td>
   <td>Initial definition.</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>

<p>{{Compat("api.HTMLSelectElement.selectedOptions")}}</p>

<h2 id="See_Also" name="See_Also">See also</h2>

<ul>
 <li>{{SectionOnPage("/en-US/docs/Learn/HTML/Forms/The_native_form_widgets", "Drop-down content")}}</li>
</ul>