HTML Form Elements

HTML Form Elements

 

This chapter describes all the different HTML form elements.

 

The <input> Element

One of the most used form element is the <input> element.

The <input> element can be displayed in several ways, depending on the type attribute.

 

<!DOCTYPE html>

<html>

<body>

 

<h2>The input Element</h2>

 

<form action=”/action_page.php”>

  <label for=”fname”>First name:</label><br>

  <input type=”text” id=”fname” name=”fname”><br><br>

  <input type=”submit” value=”Submit”>

</form>

 

</body>

</html>

The input Element




If the type attribute is omitted, the input field gets the default type: “text”.

The <select> Element

The <select> element defines a drop-down list:

<!DOCTYPE html>

<html>

<body>

 

<h2>Pre-selected Option</h2>

 

<p>You can preselect an option with the selected attribute:</p>

 

<form action=”/action_page.php”>

  <label for=”cars”>Choose a car:</label>

  <select id=”cars” name=”cars”>

  <option value=”volvo”>Volvo</option>
  <option value=”saab”>Saab</option>
  <option value=”fiat”>Fiat</option>
  <option value=”audi”>Audi</option>
</select>

  <input type=”submit”>

</form>

 

</body>

</html>

Pre-selected Option

You can preselect an option with the selected attribute:

  

The <option> elements defines an option that can be selected.

By default, the first item in the drop-down list is selected.

To define a pre-selected option, add the selected attribute to the option:

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

<!DOCTYPE html>

<html>

<body>

 

<h2>Pre-selected Option</h2>

 

<p>You can preselect an option with the selected attribute:</p>

 

<form action=”/action_page.php”>

  <label for=”cars”>Choose a car:</label>

  <select id=”cars” name=”cars”>

    <option value=”volvo”>Volvo</option>

    <option value=”saab”>Saab</option>

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

    <option value=”audi”>Audi</option>

  </select>

  <input type=”submit”>

</form>

 

</body>

</html>

Pre-selected Option

You can preselect an option with the selected attribute:

  

Visible Values:

Use the size attribute to specify the number of visible values:

<!DOCTYPE html>

<html>

<body>

 

<h2>Visible Option Values</h2>

 

<p>Use the size attribute to specify the number of visible values.</p>

 

<form action=”/action_page.php”>

  <label for=”cars”>Choose a car:</label>

 <select name=”cars” size=”3″>

  <option value=”volvo”>Volvo</option>
  <option value=”saab”>Saab</option>
  <option value=”fiat”>Fiat</option>
  <option value=”audi”>Audi</option>

</select><br><br>

  <input type=”submit”>

</form>

 

</body>

</html>

Visible Option Values

Use the size attribute to specify the number of visible values.

 

Allow Multiple Selections:

Use the multiple attribute to allow the user to select more than one value:

<!DOCTYPE html>

<html>

<body>

 

<h2>Allow Multiple Seletcions</h2>

 

<p>Use the multiple attribute to allow the user to select more than one value.</p>

 

<form action=”/action_page.php”>

  <label for=”cars”>Choose a car:</label>

  <select id=”cars” name=”cars” size=”4″ multiple>

    <option value=”volvo”>Volvo</option>

    <option value=”saab”>Saab</option>

    <option value=”fiat”>Fiat</option>

    <option value=”audi”>Audi</option>

  </select><br><br>

  <input type=”submit”>

</form>

 

<p>Hold down the Ctrl (windows) / Command (Mac) button to select multiple options.</p>

 

</body>

</html><!DOCTYPE html>

<html>

<body>

 

 

Allow Multiple Seletcions

Use the multiple attribute to allow the user to select more than one value.

 

Hold down the Ctrl (windows) / Command (Mac) button to select multiple options.

The <textarea> Element

The <textarea> element defines a multi-line input field (a text area):

<!DOCTYPE html>

<html>

<body>

 

<h2>Textarea</h2>

<p>The textarea element defines a multi-line input field.</p>

 

<form action=”/action_page.php”>

  <textarea name=”message” rows=”10″ cols=”30″>The cat was playing in the garden.</textarea>

  <br><br>

  <input type=”submit”>

</form>

 

</body>

</html>

Textarea

The textarea element defines a multi-line input field.

 

The rows attribute specifies the visible number of lines in a text area.

The cols attribute specifies the visible width of a text area.

This is how the HTML code above will be displayed in a browser:

 

The <button> Element

The <button> element defines a clickable button:

<button type=”button” onclick=”alert(‘Hello World!’)”>Click Me!</button>

<!DOCTYPE html>

<html>

<body>

 

<h2>The button Element</h2>

 

<button type=”button” onclick=”alert(‘Hello World!’)”>Click Me!</button>

 

</body>

</html>

The button Element

Note: Always specify the type attribute for the button element. Different browsers may use different default types for the button element.

The <fieldset> and <legend> Elements

The <fieldset> element is used to group related data in a form.

The <legend> element defines a caption for the <fieldset> element.

<!DOCTYPE html>

<html>

<body>

 

<h2>Grouping Form Data with Fieldset</h2>

 

<p>The fieldset element is used to group related data in a form, and the legend element defines a caption for the fieldset element.</p>

 

 <form action=”/action_page.php”>

  <fieldset>
    <legend>Personalia:</legend>
    <label for=”fname”>First name:</label><br>
    <input type=”text” id=”fname” name=”fname” value=”John”><br>
    <label for=”lname”>Last name:</label><br>
    <input type=”text” id=”lname” name=”lname” value=”Doe”><br><br>
    <input type=”submit” value=”Submit”>
  </fieldset>
</form>

</form>

 

</body>

</html>

 

Grouping Form Data with Fieldset

The fieldset element is used to group related data in a form, and the legend element defines a caption for the fieldset element.

Personalia:




This is how the HTML code above will be displayed in a browser:

Personalia:First name:

Last name:


The <datalist> Element

The <datalist> element specifies a list of pre-defined options for an <input> element.

Users will see a drop-down list of the pre-defined options as they input data.

The list attribute of the <input> element, must refer to the id attribute of the <datalist> element.

<!DOCTYPE html>

<html>

<body>

 

<h2>The datalist Element</h2>

 

<p>The datalist element specifies a list of pre-defined options for an input element.</p>

 

<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>

 

<p><b>Note:</b> The datalist tag is not supported in Safari prior version 12.1.</p>

 

</body>

</html>

The datalist Element

The datalist element specifies a list of pre-defined options for an input element.

 

Note: The datalist tag is not supported in Safari prior version 12.1.

The <output> Element

The <output> element represents the result of a calculation (like one performed by a script).

Perform a calculation and show the result in an <output> element:

<!DOCTYPE html>

<html>

<body>

 

<h2>The output Element</h2>

<p>The output element represents the result of a calculation.</p>

 

<form action=”/action_page.php”

oninput=”x.value=parseInt(a.value)+parseInt(b.value)”>

  0

  <input type=”range” id=”a” name=”a” value=”50″>

  100 +

  <input type=”number” id=”b” name=”b” value=”50″>

  =

  <output name=”x” for=”a b”></output>

  <br><br>

  <input type=”submit”>

</form>

 

<p><strong>Note:</strong> The output element is not supported in Edge prior version 13.</p>

 

</body>

</html>

The output Element

The output element represents the result of a calculation.

 100 +  = 

Note: The output element is not supported in Edge prior version 13.