Show Multiple Fields Based On Dropdown

I'm trying to show / hide fields based on the drop down menu specifying 'other', however only the first element shows, how do I make all fields with li id = 'osother' appear when s

Solution 1:

You must use ID only once in a document, so you have to change #osother to .osother. And also fields should be hidden when the value of dropdown is changed from osother.

JSFiddle is here.

HTML

<ul>
<li>
    <p>Operating System:
        <Select Class="selectmenu" id="whatever" name="OS" onchange="markDirty();" required>
            <option value="">-- Select an Option --</option>
            <option value="Win">Windows</option>
            <option value="ios">iOS</option>
            <option value="otheros">Other</option>
        </select>
    </p>
</li>
<li class="osother">Please Specify:
    <label id="oslabel">
        <input name="Other OS" type="text" placeholder="Other OS" size="50" />
    </label>
</li>
<li class="osother">Version:
    <label id="version">
        <input name="OSV" type="text" placeholder="OS Version" size="50" />
    </label>
</li>
</ul>

JS

$(document).ready(function () {
$("select").change(function () {
    $("select option:selected").each(function () {
        if ($(this).attr("value") == "otheros") {
            $(".osother").show();
        } else {
            $(".osother").hide();
        }
    });
}).change();
});

CSS

.osother {
    display:none;
}

Solution 2:

You have a few errors here:

1. You need to encapsulate your li within ul

2. id needs to be unique- as it is assumed to be, the selector will only return on (the first) element, you should use e.g. a class instead, allowing you to select multiple elements within the same grouping

3. In your HTML you have capitalised Class and Select, these should be lowercase

Demo Fiddle

HTML

<ul>
    <li>
        <p>Operating System:
            <select class="selectmenu" id="whatever" name="OS" onchange="markDirty();" required='required'></select>
        </p>
    </li>
    <li class="osother">Please Specify:
        <label id="oslabel">
            <input name="Other OS" type="text" placeholder="Other OS" size="50" />
        </label>
    </li>
    <li class="osother">Version:
        <label id="version">
            <input name="OSV" type="text" placeholder="OS Version" size="50" />
        </label>
    </li>
</ul>

JS

$(document).ready(function () {
    $("select").change(function () {
        $("select option:selected").each(function () {
            if ($(this).attr("value") == "otheros") {
                $(".osother").show();
            }
        });
    }).change();
});