HTML FORMS.pptx

Learning Outcomes:
Upon completion of this lesson, students should be able to;
 Create forms with basic elements such as text boxes and buttons:
 Create forms using HTML5 elements such as form validation and email address fields.

HTML Forms
 Although forms could simply be used to display information, HTML provides them in order to
supply a way for the user to interact with a Web server.
 The most widely used method to process the data submitted through a form is to send it to server-
side software typically written in a scripting language, although any programming language can
be used.
 Typically, form data is sent to a server (or to an email address) as a sequence of pairs, each pair
being made up of a name and an associated value.
 The method that this data uses to arrive at its destination depends on the data encoding.

HTML Forms
An HTML form is used to collect user input. The user input is most often sent to a server for
processing.
The HTML <form> element is used to create an HTML form for user input:
<form>
.
form elements
.
</form>

HTML Form Elements
The HTML <form> element can contain one or more of the following form elements:
<input>
<label>
<select>
<textarea>
<button>
<fieldset>
<legend>
<datalist>
<output>
<option>
<optgroup>

HTML Input Types
<input type="button">
<input type="checkbox">
<input type="color">
<input type="date">
<input type="datetime-local">
<input type="email">
<input type="file">
<input type="hidden">
<input type="image">
<input type="month">
<input type="number">
<input type="password">
<input type="radio">
<input type="range">
<input type="reset">
<input type="search">
<input type="submit">
<input type="tel">
<input type="text">
<input type="time">
<input type="url">
<input type="week">

The <input> Element
The HTML <input> element is the most used form element.
An <input> element can be displayed in many ways, depending on the type attribute.
A form with input fields for text:
<form>
<label for="fname">First name:</label><br>
<input type="text" id="fname" name="fname"><br>
<label for="lname">Last name:</label><br>
<input type="text" id="lname" name="lname">
</form>

Radio Buttons
The <input type="radio"> defines a radio button.
Radio buttons let a user select ONE of a limited number of choices.
A form with radio buttons:
<form>
<input type="radio" id="male" name="gender" value="male">
<label for="male">Male</label><br>
<input type="radio" id="female" name="gender" value="female">
<label for="female">Female</label><br>
<input type="radio" id="other" name="gender" value="other">
<label for="other">Other</label>
</form>

Checkboxes
The <input type="checkbox"> defines a checkbox.
Checkboxes let a user select ZERO or MORE options of a limited number of choices.
A form with checkboxes:
<form>
<input type="checkbox" id="vehicle1" name="vehicle1" value="Bike">
<label for="vehicle1"> I have a bike</label><br>
<input type="checkbox" id="vehicle2" name="vehicle2" value="Car">
<label for="vehicle2"> I have a car</label><br>
<input type="checkbox" id="vehicle3" name="vehicle3" value="Boat">
<label for="vehicle3"> I have a boat</label>
</form>

The Submit Button
The <input type="checkbox"> defines a checkbox.
Checkboxes let a user select ZERO or MORE options of a limited number of choices.
The <input type="submit"> defines a button for submitting the form data to a form-handler.
The form-handler is typically a file on the server with a script for processing input data.
The form-handler is specified in the form's action attribute
<form action="/action_page.php">
<input type="text" id="fname" name="fname" value="John"><br>
<input type="text" id="lname" name="lname" value="Doe"><br><br>
<input type="submit" value="Submit">
</form>

Input Type Password
<input type="password"> defines a password field:
<form>
<label for="username">Username:</label><br>
<input type="text" id="username" name="username"><br>
<label for="pwd">Password:</label><br>
<input type="password" id="pwd" name="pwd">
</form>

Input Type Reset
<input type="reset"> defines a reset button that will reset all form values to their default values:
<input type="reset">
</form>

Input Type Button
<input type="button"> defines a button:
<input type="button" onclick="alert('Hello World!')" value="Click Me!">

Input Type Color
The <input type="color"> is used for input fields that should contain a color.
Depending on browser support, a color picker can show up in the input field.
<form>
<label for="favcolor">Select your favorite color:</label>
<input type="color" id="favcolor" name="favcolor">
</form>

Input Type Date
The <input type="date"> is used for input fields that should contain a date.
Depending on browser support, a date picker can show up in the input field.
<form>
<label for="birthday">Birthday:</label>
<input type="date" id="birthday" name="birthday">
</form>
You can also use the min and max attributes to add restrictions to dates:
<form>
<label for="datemax">Enter a date before 1980-01-01:</label>
<input type="date" id="datemax" name="datemax" max="1979-12-31"><br><br>
<label for="datemin">Enter a date after 2000-01-01:</label>
<input type="date" id="datemin" name="datemin" min="2000-01-02">
</form>

Input Type Datetime-local
The <input type="datetime-local"> specifies a date and time input field, with no time zone.
<form>
<label for="birthdaytime">Birthday (date and time):</label>
<input type="datetime-local" id="birthdaytime" name="birthdaytime">
</form>

Input Type Email
The <input type="email"> is used for input fields that should contain an e-mail address.
Depending on browser support, the e-mail address can be automatically validated when submitted.
Some smartphones recognize the email type, and add ".com" to the keyboard to match email input.
<form>
<label for="email">Enter your email:</label>
<input type="email" id="email" name="email">
</form>

Input Type File
The <input type="file"> defines a file-select field and a "Browse" button for file uploads.
<form>
<label for="myfile">Select a file:</label>
<input type="file" id="myfile" name="myfile">
</form>

Input Type Month
The <input type="month"> allows the user to select a month and year.
<form>
<label for="bdaymonth">Birthday (month and year):</label>
<input type="month" id="bdaymonth" name="bdaymonth">
</form>

Input Type Search
The <input type="search"> is used for search fields (a search field behaves like a
regular text field).
<form>
<label for="gsearch">Search Google:</label>
<input type="search" id="gsearch" name="gsearch">
</form>

Input Type Tel
The <input type="tel"> is used for input fields that should contain a telephone
number.
<form>
<label for="phone">Enter your phone number:</label>
<input type="tel" id="phone" name="phone" pattern="[0-9]{3}-[0-9]{2}-[0-9]{3}">
</form>

The <label> Element
The <label> tag defines a label for many form elements.
The <label> element is useful for screen-reader users, because the screen-reader will read out loud
the label when the user focus on the input element.
The <label> element also help users who have difficulty clicking on very small regions (such as radio
buttons or checkboxes) - because when the user clicks the text within the <label> element, it
toggles the radio button/checkbox.
The for attribute of the <label> tag should be equal to the id attribute of the <input> element to
bind them together.

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

The <select> Element
Allow Multiple Selections:
Use the multiple attribute to allow the user to select more than one value:
<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>

The <textarea> Element
The <textarea> element defines a multi-line input field (a text area):
<textarea name="message" rows="10" cols="30">
The cat was playing in the garden.
</textarea>
The rows attribute specifies the visible number of lines in a text area.
The cols attribute specifies the visible width of a text area.

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.
<fieldset>
<legend>Personalia:</legend>
</fieldset>
</form>

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

HTML Form Attributes
The Action Attribute
The action attribute defines the action to be performed when the form is submitted.
Usually, the form data is sent to a file on the server when the user clicks on the submit button.
In the example below, the form data is sent to a file called "action_page.php". This file contains a server-side
script that handles the form data:
On submit, send form data to "action_page.php":
</form>
If the action attribute is omitted, the action is set to the current page.

The Target Attribute
The target attribute specifies where to display the response that is received
after submitting the form.
The default value is _self which means that the response will open in the current
window.
Here, the submitted result will open in a new browser tab:
<form action="/action_page.php" target="_blank">

The Method Attribute
The method attribute specifies the HTTP method to be used when submitting the form data.
The form-data can be sent as URL variables (with method="get") or as HTTP post transaction (with
method="post").
The default HTTP method when submitting form data is GET.
This example uses the GET method when submitting the form data:
<form action="/action_page.php" method="get">
This example uses the POST method when submitting the form data:
<form action="/action_page.php" method="post">
Always use POST if the form data contains sensitive or personal information!

The Method Attribute
Appends the form data to the URL, in
name/value pairs
NEVER use GET to send sensitive data!
(the submitted form data is visible in the
URL!)
The length of a URL is limited (2048
characters)
Useful for form submissions where a user
wants to bookmark the result
GET is good for non-secure data, like
query strings in Google
Appends the form data inside the body
of the HTTP request (the submitted
form data is not shown in the URL)
POST has no size limitations, and can
be used to send large amounts of
data.
Form submissions with POST cannot be
bookmarked

The Autocomplete Attribute
The autocomplete attribute specifies whether a form should have autocomplete
on or off.
When autocomplete is on, the browser automatically complete values based on
values that the user has entered before.
A form with autocomplete on:
<form action="/action_page.php" autocomplete="on">

The Novalidate Attribute
The novalidate attribute is a boolean attribute.
When present, it specifies that the form-data (input) should not be validated
when submitted.
A form with a novalidate attribute:
<form action="/action_page.php" novalidate>

The Name Attribute for <input>
Notice that each input field must have a name attribute to be submitted.
If the name attribute is omitted, the value of the input field will not be sent at all.
This example will not submit the value of the "First name" input field:
<input type="text" id="fname" value="John"><br><br>
</form>

HTML FORMS.pptx

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HTML FORMS.pptx