How do I set an un-selectable default description

问题:

I have a drop down where the user selects a language:

<select>
    <option>English</option>
    <option>Spanish</option>
</select>

1. I want the default option that is initially displayed to say "Select a language" instead of "English" (my first option, displayed by default).
2. I don't want the user to be able to select "Select a language".

回答1:

If none of the options in the select have a selected attribute, the first option will be the one selected.

In order to select a default option that is not the first, add a selected attribute to that option:

<option selected="selected">Select a language</option>

You can read the HTML 4.01 spec regarding defaults in select element.

I suggest reading a good HTML book if you need to learn HTML basics like this - I recommend Head First HTML.

回答2:

Building on Oded's answer, you could also set the default option but not make it a selectable option if it's just dummy text. For example you could do:

<option selected="selected" disabled="disabled">Select a language</option>

This would show "Select a language" before the user clicks the select box but the user wouldn't be able to select it because of the disabled attribute.

回答3:

.selectmenu{
  
	-webkit-appearance: none;  /*Removes default chrome and safari style*/
	-moz-appearance: none; /* Removes Default Firefox style*/
	background: #0088cc ;
	width: 200px; /*Width of select dropdown to give space for arrow image*/
	text-indent: 0.01px; /* Removes default arrow from firefox*/
	text-overflow: "";  /*Removes default arrow from firefox*/ /*My custom style for fonts*/
	color: #FFF;
	border-radius: 2px;
	padding: 5px;
    border:0 !important;
	box-shadow: inset 0 0 5px rgba(000,000,000, 0.5);
}
.hideoption { display:none; visibility:hidden; height:0; font-size:0; }

Try this html

<select class="selectmenu">
<option selected disabled class="hideoption">Select language</option>
<option>Option 1</option>
<option>Option 2</option>
<option>Option 3</option>
<option>Option 4</option>
<option>Option 5</option>
</select>

回答4:

Just make option#1 Select Language:

Live Demo

回答5:

<option value="" selected disabled hidden>Default Text</option>

Leaving the disabled flag in prevents them from not selecting an option and the hidden flag will remove it from the list. In my case I was using it with an enum list as well and the concept holds the same

<select asp-for="Property" asp-items="Html.GetEnumSelectList<PropertyEnum>()">
                        <option value="" selected disabled hidden>Select Property Enum</option>
                        <option value=""></option>
                    </select>

回答6:

Put your prompt in the 1st option and disable it:

<selection>
    <option disabled selected>”Select a language”</option>
    <option>English</option>
    <option>Spanish</option>
</selection>

The first option will automatically be the selected default (what you see first when you look at the drop-down) but adding the selected attribute is more clear and actually needed when the first field is a disabled field.

The disabled attribute will make the option be un-selectable/grayed out.

---

Other answers suggest setting disabled=“disabled” but that’s only necessary if you need to parse as XHTML, which is basically a more strict version of HTML. disabled on it’s on is enough for standard HTML.

---

If you want to make the selection “required” (without accepting the “Select a language” option as an accepted answer):

Add the required attribute to selection and set the first option’s value to the empty string ””.

<selection required>
    <option disabled value=“”>Select a language</option>
    <option>English</option>
    <option>Spanish</option>
</selection>