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Create a Basic Form
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Even the most basic forms have the same structure This includes opening and closing form tags, input controls, and processing methods The form tags surround the entire form, just as html tags surround the entire HTML document
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<form> content goes here </form>
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Figure 11-1 Online forms have a variety of uses, from sending messages to searching for keywords First, let s discuss input controls, or ways for users to enter data For example, for you to enter your name on a form, there must be a space for you to do so This space is what I m referring to when I use the phrase input control or simply control Figure 11-1 contains some of the following input controls
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Text inputs Check boxes Radio buttons Select menus File selects Buttons (submit buttons, reset buttons, and push buttons) Hidden controls
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You can also use the object tag (discussed in 7) to embed objects within forms These are called object controls
Because the majority of these controls are created with an input tag, the actual description of which control you want to include is made through the type attribute, as in the following example:
<form> <input type="text" /> </form>
The next sections explain the specific types of controls created with the input tag, as well as a few others that aren t created by it
Text Input
Two types of text input are afforded in HTML: single-line text boxes (called text fields) and multiple-line text areas
Single-Line Text Fields
The most basic type of input control is the single-line text field This control is a space, resembling a box, that can contain a single line of text Usually, text fields are preceded by descriptive text telling the user what to enter in the box For example:
<form> Please enter your first name: <input type="text" /><br /> Please enter your last name: <input type="text" /> </form>
As the following illustration shows, text fields are single-line white spaces that appear slightly indented into the page Unless you specify otherwise with the size attribute, text fields are usually 20 characters in length
11: Employing Forms NOTE
The sizes of text fields are specified in characters However, it ultimately depends on the default font size in the viewer s browser This means even though you might specify a text field to be 25 characters in length, it may appear larger or smaller on someone else s system, depending on how that person s browser is set up
Any of the attributes listed in Table 11-1 can be added to this input tag to customize the text field Of those attributes, perhaps the most important one is name To process all the controls in your form, each one must be identified with a name For example, when the form is processed, you could tell it to take whatever the user entered in the control you named FirstName and print that text at the top of an e-mail message
Blank spaces between words in the values of some attributes can cause problems in HTML and other coding methods To avoid such problems when using the name attribute, many developers like to run any phrases together, capitalizing the first letter in each word For example, instead of using Middle Initial as the value of your name attribute, use MiddleInitial Just remember, these values are case-sensitive, which means whenever you reference that control later, you must also capitalize the first letter of each word In addition, be sure to use unique names to avoid confusion when the form is processed <form> Please enter your first name: <input type="text" name="FirstName" /> <br /> Please enter your last name: <input type="text" name="LastName" /> </form>
The other three attributes size, maxlength, and value are optional You can use the size attribute to specify the length of the text field in characters, while the maxlength attribute enables you to limit the number of characters that can be entered in that box For example, if you
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