HTML Forms

Forms in html

An HTML forms is a section of a document which contains controls such as text fields, password fields, checkboxes, radio buttons, submit button, menus etc.

A form will take input from the site visitor and then will post it to a back-end application such as CGI, ASP Script or PHP script etc. The back-end application will perform required processing on the passed data based on defined business logic inside the application.

An HTML forms facilitates the user to enter data that is to be sent to the server for processing such as name, email address, password, phone number, etc.

The HTML <form> tag is used to create an HTML forms and it has following syntax:

Example:

<form action = “Script URL” method = “GET|POST”>
form elements like input, textarea etc.
</form>

HTML Forms Attributes

Apart from common attributes, following is a list of the most frequently used form attributes:

Sr.NoAttribute         Description
1.actionBackend script ready to process your passed data.
2.methodMethod to be used to upload data. The most frequently used are GET and POST methods.
3.targetSpecify the target window or frame where the result of the script will be displayed. It takes values like _blank, _self, _parent etc.
4.enctypeYou can use the enctype attribute to specify how the browser encodes the data before it sends it to the server. Possible values are :   application/x-www-form-urlencoded: This is the standard method most forms use in simple scenarios.   mutlipart/form-data: This is used when you want to upload binary data in the form of files like image, word file etc.

HTML Forms Controls:

There are different types of form controls that you can use to collect data using HTML form :

1 Text Input Controls
2. Checkboxes Controls
3. Radio Box Controls
4. Select Box Controls
5. File Select boxes
6. Hidden Controls
7. Clickable Buttons
8. Submit and Reset Button


Text Input Controls

There are three types of text input used on forms :

Single-line text input controls : This control is used for items that require only one line of user input, such as search boxes or names. They are created using HTML <input> tag.

Password input controls : This is also a single-line text input but it masks the character as soon as a user enters it. They are also created using HTMl <input> tag.

Multi-line text input controls : This is used when the user is required to give details that may be longer than a single sentence. Multi-line input controls are created using HTML <textarea> tag.


Single-line text input controls:

This control is used for items that require only one line of user input, such as search boxes or names. They are created using HTML <input> tag.

Example:

Here is a basic example of a single-line text input used to take first name and last name :

<!DOCTYPE html>
<html>
   <head>
      <title>Text Input Control</title>
   </head>
   <body>
      <form >
         First name: <input type = “text” name = “first_name” />
         <br>
         Last name: <input type = “text” name = “last_name” />
      </form>
   </body>
</html>

Attributes:

Following is the list of attributes for <input> tag for creating text field.

Sr.NoAttribute         Description
1.typeIndicates the type of input control and for text input control it will be set to text.
2.nameUsed to give a name to the control which is sent to the server to be recognized and get the value.
3.valueThis can be used to provide an initial value inside the control.
4.sizeAllows to specify the width of the text-input control in terms of characters.
5.maxlengthAllows to specify the maximum number of characters a user can enter into the text box.

Password input controls:

This is also a single-line text input but it masks the character as soon as a user enters it. They are also created using HTML <input>tag but type attribute is set to password.

Example:

Here is a basic example of a single-line password input used to take user password :

<!DOCTYPE html>
<html>
   <head>
      <title>Password Input Control</title>
   </head>
   <body>
      <form >
         User ID : <input type = “text” name = “user_id” />
         <br>
         Password: <input type = “password” name = “password” />
      </form>
   </body>
</html>

Attributes:

Following is the list of attributes for <input> tag for creating password field.

Sr.NoAttribute        Description
1.typeIndicates the type of input control and for password input control it will be set to password.
2.nameUsed to give a name to the control which is sent to the server to be recognized and get the value.
3.valueThis can be used to provide an initial value inside the control.
4.sizeAllows to specify the width of the text-input control in terms of characters.
5.maxlengthAllows to specify the maximum number of characters a user can enter into the text box.

Multiple-Line Text Input Controls:

This is used when the user is required to give details that may be longer than a single sentence. Multi-line input controls are created using HTML <textarea> tag.

Example:

            Here is a basic example of a multi-line text input used to take item description :

<!DOCTYPE html>
<html>
   <head>
      <title>Multiple-Line Input Control</title>
   </head>
   <body>
      <form>
         Description : <br />
         <textarea rows = “5” cols = “50” name = “description”>
            Enter description here…
         </textarea>
      </form>
   </body>
</html>

Attributes:

Following is the list of attributes for <textarea> tag.

Sr.NoAttributeDescription
1.nameUsed to give a name to the control which is sent to the server to be recognized and get the value.
2.rowsIndicates the number of rows of text area box.
3.colsIndicates the number of columns of text area box

Checkbox Control:

Checkboxes are used when more than one option is required to be selected. They are also created using HTML <input> tag but type attribute is set to checkbox.

Example:

Here is an example HTML code for a form with two checkboxes :

<!DOCTYPE html>
<html>
   <head>
      <title>Checkbox Control</title>
   </head>
   <body>
      <form>
         <input type = “checkbox” name = “maths” value = “on”> Maths
         <input type = “checkbox” name = “physics” value = “on”> Physics
      </form>
   </body>
</html>

Attributes:

Following is the list of attributes for <checkbox> tag.

Sr.NoAttribute         Description
1.typeIndicates the type of input control and for checkbox input control it will be set to checkbox.
2.nameUsed to give a name to the control which is sent to the server to be recognized and get the value.
3.valueThe value that will be used if the checkbox is selected.
4.checkedSet to checked if you want to select it by default.

Radio Button Control:

Radio buttons are used when out of many options, just one option is required to be selected. They are also created using HTML <input> tag but type attribute is set to radio.

Example:

Here is example HTML code for a form with two radio buttons :

<!DOCTYPE html>
<html>
   <head>
      <title>Radio Box Control</title>
   </head>
   <body>
      <form>
         <input type = “radio” name = “subject” value = “maths”> Maths
         <input type = “radio” name = “subject” value = “physics”> Physics
      </form>
   </body>
</html>

Attributes:

Following is the list of attributes for radio button.

Sr.NoAttribute        Description
1.typeIndicates the type of input control and for checkbox input control it will be set to radio.
2.nameUsed to give a name to the control which is sent to the server to be recognized and get the value.
3.valueThe value that will be used if the radio box is selected.
4.checkedSet to checked if you want to select it by default.

Select Box Control:

A select box, also called drop down box which provides option to list down various options in the form of drop down list, from where a user can select one or more options.

Example:

Here is example HTML code for a form with one drop down box:

<!DOCTYPE html>
<html>
   <head>
      <title>Select Box Control</title>
   </head>
   <body>
      <form>
         <select name = “dropdown”>
            <option value = “Maths” selected>Maths</option>
            <option value = “Physics”>Physics</option>
         </select>
      </form>
   </body>
</html>

Attributes:

Following is the list of important attributes of <select> tag :

Sr.NoAttribute          Description
1.nameUsed to give a name to the control which is sent to the server to be recognized and get the value.
2.sizeThis can be used to present a scrolling list box.
3.multipleIf set to “multiple” then allows a user to select multiple items from the menu.

Following is the list of important attributes of <option> tag :

Sr.NoAttribute        Description
1.valueThe value that will be used if an option in the select box box is selected.
2.selectedSpecifies that this option should be the initially selected value when the page loads.
3.labelAn alternative way of labeling options

File Upload Box:

If you want to allow a user to upload a file to your web site, you will need to use a file upload box, also known as a file select box. This is also created using the <input> element but type attribute is set to file.

Example:

<!DOCTYPE html>
<html>
   <head>
      <title>File Upload Box</title>
   </head>
   <body>
      <form>
         <input type = “file” name = “fileupload” accept = “image/*” />
      </form>
   </body>
</html>

Attributes:

Following is the list of important attributes of file upload box :

Sr.NoAttribute        Description
1.nameUsed to give a name to the control which is sent to the server to be recognized and get the value.
2.acceptSpecifies the types of files that the server accepts.

Button Controls:

There are various ways in HTML to create clickable buttons. You can also create a clickable button using <input>tag by setting its type attribute to button. The type attribute can take the following values:

Sr.NoType       Description
1.submitThis creates a button that automatically submits a form.
2.resetThis creates a button that automatically resets form controls to their initial values.
3.buttonThis creates a button that is used to trigger a client-side script when the user clicks that button.
4.imageThis creates a clickable button but we can use an image as background of the button.

Example:

Here is example HTML code for a form with three types of buttons :

<!DOCTYPE html>
<html>
   <head>
      <title>File Upload Box</title>
   </head>
   <body>
      <form>
         <input type = “submit” name = “submit” value = “Submit” />
         <input type = “reset” name = “reset”  value = “Reset” />
         <input type = “button” name = “ok” value = “OK” />
         <input type = “image” name = “imagebutton” src = “/html/images/logo.png” />
      </form>
   </body>
</html>

Hidden HTML Forms Controls:

Hidden form controls are used to hide data inside the page which later on can be pushed to the server. This control hides inside the code and does not appear on the actual page. For example, following hidden form is being used to keep current page number. When a user will click next page then the value of hidden control will be sent to the web server and there it will decide which page will be displayed next based on the passed current page.

Example:

Here is example HTML code to show the usage of hidden control :

<!DOCTYPE html>
<html>
   <head>
      <title>File Upload Box</title>
   </head>
   <body>
      <form>
         <p>This is page 10</p>
         <input type = “hidden” name = “pagename” value = “10” />
         <input type = “submit” name = “submit” value = “Submit” />
         <input type = “reset” name = “reset”  value = “Reset” />
      </form>
   </body>
</html>

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