3.7 FormsThe <form> ElementThe <input> ElementText FieldsInput Type Checkbox The <label> ElementThe <select> ElementThe <textarea> ElementRadio ButtonsThe Submit Button The value AttributeThe size AttributeThe maxlength AttributeThe placeholder Attribute
An HTML form is used to collect user input. The user input can then be sent to a server for processing.
The <form> Element
The HTML <form> element defines a form that is used o collect user input. An HTML form contains form elements. Form elements are different types of input elements, like text fields, checkboxes, radio buttons, submit buttons and more.
The <input> Element
The <input> element is the most important form element, The <input> element is displayed in several ways, depending on the type attribute.
<input type ="text"> defines a single-line input field for text input.
Note: The form itself is not visible. Also note that the default width of an input field is 20 characters.
Input Type Checkbox
<input type="checkbox"> defines a checkbox. Checkboxes let a user select Zero or More options of a limited number of choices.
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 is focused 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.
The<option> elements define 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 <textarea> Element
The<textarea> element defines a multi-line input field( a text area). The rows attribute specifies the visible number of lines in a text area. The cols attribute specifies the visible width of a text area.
<input type ="radio"> defines a radio button. Radio buttons let a user select ONE of a limited number of choices.
The Submit Button
<input type ="submit"> defines a button for submitting the form data to a form-handler. The form-handler is typically a page on the server with a script for processing input data.
The value Attribute
The input value attribute specifies an initial value for an input field:
The size Attribute
The input size attribute specifies the visible width, in characters, of an input field. The default value for size is 20.
Note: The size attribute works with the following input types: text, search, tel, URL, email, and password.
The maxlength Attribute
The input maxlength attribute specifies the maximum numbers of characters allowed in an input field.
The placeholder Attribute
The input placeholder attribute specifies short a hint that describes the expected value of an input field(a sample value or a short description of the expected format). The short hint is displayed in the input field before the user enters a value. The placeholder attribute works with the following input types: text, search, URL, tel, email, and password.
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