Forms can be used to send data across the web and are often used as contact forms to convert information inputted by a user into an email, such as the one used on this website.
On their own, forms are useless. They need to be hooked up to a program that will process the data inputted by the user. These take all manner of guises and are outside of the remit of this website. If you use an internet service provider to host your HTML, they will be able to help you with this and will probably have clear and simple instructions on how, for example, to make a form-to-email form work.
The tags used in the actual HTML of forms are form, input, text Area, select and option. form defines the form and within this tag, there is one required action attribute which tells the form where its contents will be sent to when it is submitted.
The optional method attribute tells the form how the data in it is going to be sent and it can have the value get (which is default) or post. This is commonly used, and often set to post which hides the information (get latches the information onto the URL).
So a form element will look something like this:
<form action="processingscript.php" method="post">
</form>
The input tag is the daddy of the form world. It can take ten forms, outlined below:
<input type="text" /> is a standard textbox. This can also have avalue attribute, which sets the text in the textbox.
<input type="password" /> is the same as the textbox, but will displayasterisks instead of the actual characters that the user types.
<input type="checkbox" /> is a checkbox, which can be toggled on andoff by the user. This can also have a checked attribute, which would beused in the format <input type="checkbox" checked="checked" />.
<input type="radio" /> is similar to a checkbox, but the user can onlyselect one radio button in a group. This can also have a checkedattribute, used in the same way as the checkbox.
<input type="file" /> is an area that shows the files on your computer,like you see when you open or save a document in most programs.
<input type="submit" /> is a button that when selected will submit theform. You can control the text that appears on the submit button (as youcan with button and reset types - see below) with the value attribute, forexample <input type="submit" value="Ooo. Look. Text on abutton. Wow" />.
<input type="image" /> is an image that when selected will submit theform. This also requires a src attribute, like the img tag.
<input type="button" /> is a button that will not do anything withoutextra code added.
<input type="reset" /> is a button that when selected will reset theform fields.
<input type="hidden" /> is a field that will not be displayed and is usedto pass information such as the page name that the user is on or the emailaddress that the form should be posted to.Note that the input tag closes itself with a '/>' at the end.
A textarea is, basically, a large text box. It requires a rows and cols
attribute and is used like this:
<textarea rows="5" cols="20"> A big load of text here</textarea>The select tag works with the option tag to make drop-down selectboxes.
They work like this:
<select><option value="first option">Option 1</option><option value="second option">Option 2</option><option value="third option">Option 3</option></select>
When the form is submitted, the value of the selected option will be sent. Similar to the checked attribute of check boxes and radio buttons, an option tag can also have a selected attribute, which would be used in the format
<option value="mouse" selected="selected">Rodent</option>.
All of the tags mentioned above will look very nice presented on the page, but if you hook up your form to a form-handling program, they will all be ignored. This is because the form fields need names. So to all of the fields, the attribute name needs to be added,
for example
<input type="text" name="talkingsponge" />
A form might look like the one below. (Note: this form will not work unless here is a 'contactus.php' file, which is stated in the action attribute of the form tag, to handle the submitted date)
<html>
<head>
<title>My first web page</title>
</head>
<body>
<form action="contactus.php" method="post">
<p>Name:</p>
<p><input type="text" name="name" value="Your name" /></p>
<p>Comments: </p><p><textarea name="comments" rows="5"
cols="20">Your comments</textarea></p>
<p>Are you:</p>
<p><input type="radio" name="areyou" value="male" /> Male</p>
<p><input type="radio" name="areyou" value="female" /> Female</p>
<p><input type="submit" /></p>
<p><input type="reset" /></p>
</form>
</body>
</html>
There is a whole other level of complexity you can delve into in the HTML Advanced Guide if you are so inclined.
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