The value attribute specifies the initial value for an input field:
The readonly attribute specifies that the input field is read only (cannot be changed):
The readonly attribute does not need a value. It is the same as writing readonly="readonly".
The disabled attribute specifies that the input field is disabled.
A disabled element is un-usable and un-clickable.
Disabled elements will not be submitted.
The disabled attribute does not need a value. It is the same as writing disabled="disabled".
The size attribute specifies the size (in characters) for the input field:
The maxlength attribute specifies the maximum allowed length for the input field:
With a maxlength attribute, the input control will not accept more than the allowed number of characters.
The attribute does not provide any feedback. If you want to alert the user, you must write JavaScript code.
Input restrictions are not foolproof. JavaScript provides many ways to
add illegal input. To safely restrict input, restrictions must be checked by the receiver (the server) as well. |
HTML5 added the following attributes for <input>:
and the following attributes for <form>:
The autocomplete attribute specifies whether a form or input field should have autocomplete on or off.
When autocomplete is on, the browser automatically complete values based on values that the user has entered before.
Tip: It is possible to have autocomplete "on" for the form, and "off" for specific input fields, or vice versa.
The autocomplete attribute works with <form> and the following <input> types: text, search, url, tel, email, password, datepickers, range, and color.
An HTML form with autocomplete on (and off for one input field):
Tip: In some browsers you may need to activate the autocomplete function for this to work.
The novalidate attribute is a <form> attribute
When present, novalidate specifies that form data should not be validated when submitted.
Indicates that the form is not to be validated on submit:
The autofocus attribute is a boolean attribute.
When present, it specifies that an <input> element should automatically get focus when the page loads.
Let the "First name" input field automatically get focus when the page loads:
The form attribute specifies one or more forms an <input> element belongs to.
Tip: To refer to more than one form, use a space-separated list of form ids.
An input field located outside the HTML form (but still a part of the form):
The formaction attribute specifies the URL of a file that will process the input control when the form is submitted.
The formaction attribute overrides the action attribute of the <form> element.
The formaction attribute is used with type="submit" and type="image".
An HTML form with two submit buttons, with different actions:
The formenctype attribute specifies how the form-data should be encoded when submitting it to the server (only for forms with method="post")
The formenctype attribute overrides the enctype attribute of the <form> element.
The formenctype attribute is used with type="submit" and type="image".
Send form-data that is default encoded (the first submit button), and encoded as "multipart/form-data" (the second submit button):
The formmethod attribute defines the HTTP method for sending form-data to the action URL.
The formmethod attribute overrides the method attribute of the <form> element.
The formmethod attribute can be used with type="submit" and type="image".
The second submit button overrides the HTTP method of the form:
The novalidate attribute is a boolean attribute.
When present, it specifies that the <input> element should not be validated when submitted.
The formnovalidate attribute overrides the novalidate attribute of the <form> element.
The formnovalidate attribute can be used with type="submit".
A form with two submit buttons (with and without validation):
The formtarget attribute specifies a name or a keyword that indicates where to display the response that is received after submitting the form.
The formtarget attribute overrides the target attribute of the <form> element.
The formtarget attribute can be used with type="submit" and type="image".
A form with two submit buttons, with different target windows:
The height and width attributes specify the height and width of an <input> element.
The height and width attributes are only used with <input type="image">.
Always specify the size of images. If the browser does not know the size, the page will flicker while images load. |
Define an image as the submit button, with height and width attributes:
The list attribute refers to a <datalist> element that contains pre-defined options for an <input> element.
An <input> element with pre-defined values in a <datalist>:
The min and max attributes specify the minimum and maximum value for an <input> element.
The min and max attributes work with the following input types: number, range, date, datetime, datetime-local, month, time and week.
<input> elements with min and max values:
The multiple attribute is a boolean attribute.
When present, it specifies that the user is allowed to enter more than one value in the <input> element.
The multiple attribute works with the following input types: email, and file.
A file upload field that accepts multiple values:
The pattern attribute specifies a regular expression that the <input> element's value is checked against.
The pattern attribute works with the following input types: text, search, url, tel, email, and password.
Tip: Use the global title attribute to describe the pattern to help the user.
Tip: Learn more about regular expressions in our JavaScript tutorial.
An input field that can contain only three letters (no numbers or special characters):
The placeholder attribute specifies a hint that describes the expected value of an input field (a sample value or a short description of the format).
The 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.
An input field with a placeholder text:
The required attribute is a boolean attribute.
When present, it specifies that an input field must be filled out before submitting the form.
The required attribute works with the following input types: text, search, url, tel, email, password, date pickers, number, checkbox, radio, and file.
A required input field:
The step attribute specifies the legal number intervals for an <input> element.
Example: if step="3", legal numbers could be -3, 0, 3, 6, etc.
Tip: The step attribute can be used together with the max and min attributes to create a range of legal values.
The step attribute works with the following input types: number, range, date, datetime, datetime-local, month, time and week.
An input field with a specified legal number intervals: