HTML formulær elementer

Dette kapitel beskriver alle HTML-formularelementer.

<input> elementet

Den vigtigste formularkomponent er <input> elementer.

<input> elementet afhænger af forskellige type Egenskaber kan ændres til flere former.

Note:Næste kapitel forklarer alle HTML-indtastningstyper.

<select> elementet (rulnedgang)

<select> Elementet definererRulnedgang:

Example

<select name="cars">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="fiat">Fiat</option>
<option value="audi">Audi</option>
</select>

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<option> Elementet definerer valg, der kan vælges.

Lister viser ofte den første indstilling som valgt.

Du kan definere foruddefinerede valg ved at tilføje selected-attributten.

Example

<option value="fiat" selected>Fiat</option>

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<textarea> elementet

<textarea> Elementet definerer en flerlinjet indtastningsfelt (Tekstfelt）：

Example

<textarea name="message" rows="10" cols="30">
Katten leger i haven.
</textarea>

Try it yourself

The above HTML code is displayed in the browser as:

Katten leger i haven.

<button> element

<button> Element defines clickableButton:

Example

<button type="button" onclick="alert('Hello World!')">Click Me!</button>

Try it yourself

The above HTML code is displayed in the browser as:

HTML5 form elements

HTML5 has added the following form elements:

  • <datalist>
  • <keygen>
  • <output>

Note:By default, browsers do not display unknown elements. New elements will not break your page.

HTML5 <datalist> element

<datalist> Element defines a predefined option list for the <input> element.

The user will see a dropdown list of predefined options when they enter data.

of the <input> element list The property must refer to the <datalist> element's id Properties.

Example

Set predefined values for the <input> element using <datalist>:

<form action="action_page.php">
<input list="browsers">
<datalist id="browsers">
   <option value="Internet Explorer">
   <option value="Firefox">
   <option value="Chrome">
   <option value="Opera">
   <option value="Safari">
</datalist> 
</form>

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