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HTML Input Attributes

The HTML value Attribute:

The value attribute is one of the HTML input attributes and used to define the initial value of the input element.

Example:

<form>
Name:
<input type="text" name="firstname" value="David">
</form>
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The HTML readonly Attribute:

The read-only attribute is one of the HTML input attributes and used to define that the text written in the input or text area is read-only. It means the user cannot modify the content already present in the input field.

Example:

<form>
First name:
<input type="text" name="firstname" value ="David" readonly><br><br>
Last name:
<input type="text" name="lastname">
</form>
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The HTML disabled Attribute:

The disabled attribute is one of the HTML input attributes and used to define that the input field is disabled. The input field which is disabled is un-clickable and unusable. The values of the disabled input field will not be sent while submitting the form.

Example:

<form>
First name:
<input type="text" name="firstname" value ="David" disabled><br><br>
Last name:
<input type="text" name="lastname">
</form>
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The HTML size Attribute:

The HTML size attribute is used to specify the size of the input field in terms of characters.
It works with many input fields like text, search, email, password, etc.

Example:

<form>
First name:
<input type="text" name="firstname" value="David" size="30"><br><br>
Last name:
<input type="text" name="lastname">
</form>
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The HTML maxlength Attribute:

The maxlength attribute is used to define the maximum number of characters allowed in the input field. If you use maxlength attribute, the input field will not accept more than the allowed number of characters.

Example:

<form>
First name:
<input type="text" name="firstname" maxlength="20"> <br><br>
Last name:
<input type="text" name="lastname">
</form>
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HTML5 Attributes

HTML5 added the some new attributes for <input>:

The autocomplete Attribute:

The HTML autocomplete attribute is used to specify whether the input field should have autocomplete on or off. When autocomplete attribute is set to on, the browser will automatically complete the input values based on values that the user has entered before. It works with input fields like text, search, URL, email, password, date pickers, range, and color.

Example:

<form action="/sample_page.php" autocomplete="on">
First name: <input type="text" name="fname"><br><br>
Last name: <input type="text" name="lname"><br><br>
E-mail: <input type="email" name="email" autocomplete="off"><br><br>
<input type="submit">
</form>
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The novalidate Attribute:

The novalidate attribute is used to specify that the data of the form should not be validated when submitting the form. It is used with the HTML <form> element.

Example:

<form action="/sample_page.php" novalidate>
E-mail: <input type="email" name="user-mail">
<input type="submit">
</form>
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The autofocus Attribute:

The autofocus attribute is used to specify that the input field should get focus when the page loads.

Example:

<form action="/sample_page.php">
First name: <input type="text" name="fname" autofocus><br><br>
Last name: <input type="text" name="lname"><br><br>
<input type="submit">
</form>
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The form Attribute:

The form attribute is used to specify that the element can contain one or more forms.

Example:

<form action="/sample_page.php" id="form">
First name: <input type="text" name="fname"><br>
<input type="submit" value="Submit">
</form>
Last name: <input type="text" name="lname" form="form">
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The formaction Attribute:

The formaction attribute is used to specify the URL of a file that will process the input control when the form is submitted. It overrides the action attribute of an <form> element and it is used with type=”submit” and type=”image”.

Example:

<form action="/sample_page.php">
First name: <input type="text" name="fname"><br><br>
Last name: <input type="text" name="lname"><br><br>
<input type="submit" value="Submit"><br><br>
<input type="submit" formaction="/sample_page2.php" value="Submit the form to another page">
</form>
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The formenctype Attribute:

The formenctype attribute is used to specify that the data of the form should be encoded when submitting to the server. The formenctype attribute is used only for the forms with the method=”post”. It overrides the enctype attribute of the <form> element. It is used with type=”submit” and type=”image”.

Example:

<form action="/sample_page_binary.asp" method="post">
First name: <input type="text" name="fname"><br><br>
<input type="submit" value="Submit">
<input type="submit" formenctype="multipart/form-data" value="Submit as Multipart/form-data">
</form>
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The formmethod Attribute:

The formmethod attribute specifies the HTTP method (GET or POST) to be used when the form data is submitted to the server. It overrides the method attribute of the <form> element. This attribute is used with type=”submit” and type=”image”.

Example:

<form action="/sample_page.php" method="get">
First name: <input type="text" name="fname"><br><br>
Last name: <input type="text" name="lname"><br><br>
<input type="submit" value="Submit">
<input type="submit" formmethod="post" value="Submit using POST">
</form>
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The formnovalidate Attribute:

The formnovalidate attribute is used to specify that the input field should not be validated while submitting the form. It overrides the novalidate attribute of the <form> element and it is used with the type=”submit”.

Example:

<form action="/sample_page.php">
E-mail: <input type="email" name="email"><br><br>
<input type="submit" value="Submit"><br><br>
<input type="submit" formnovalidate value="Submit without validation">
</form>
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The formtarget Attribute:

The formtarget HTML attribute is used to specify where to display the response that is received after submitting the form.
It overrides the target attribute of the <form> element and it is used with type=”submit” and type=”image”.

Example:

<form action="/sample_page.php">
First name: <input type="text" name="fname"><br><br>
Last name: <input type="text" name="lname"><br><br>
<input type="submit" value="Submit as normal">
<input type="submit" formtarget="_blank" value="Submit to a new window/tab">
</form>
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The height and width Attributes:

The height and width attributes are used to specify the height and width of an <input type=”image”> element.

Example:

<form action="/sample_page.php">
First name: <input type="text" name="fname">
Last name: <input type="text" name="lname"><br>
<input type="image" src="submit.png" alt="Submit" width="50" height="50">
</form>
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The list Attribute:

The list attribute is used to identify a list of pre-defined options for an <input> element.

Example:

<form action="/sample_page.php" method="get">
<input list="technologies" name="technology">
<datalist id="technologies">
<option value="HTML">
<option value="CSS">
<option value="JavaScript">
<option value="jQuery">
<option value="Bootstrap">
</datalist>
<input type="submit">
</form>
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The min and max Attributes:

The min and max attributes are used to define the minimum and maximum values for an <input> element. It works with the number, range, date, datetime-local, month, time and week input types.

Example:

<form>
Enter a date before 1970-01-01:
<input type="date" name="bday" max="1969-12-31"><br><br>
Enter a date after 2002-01-01:
<input type="date" name="bday" min="2002-01-02"><br><br>
<input type="submit">
</form>
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The multiple Attribute:

The multiple attribute is used to define that the user is allowed to enter more than one value in the <input> element.

Example:

<form action="/sample_page.php">
Select files: <input type="file" name="file" multiple><br>
<input type="submit">
</form>
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The pattern Attribute:

The pattern attribute is used to specify the regular expression on which the input element value is checked. It works with the following input types: text, password, search, date, url, email, tel, etc.

Example:

<form action="/sample_page.php">
Password: <input type="text" name="Password" pattern="[A-Za-z]{6}" title="6 letter Password">
<input type="submit">
</form>
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The placeholder Attribute:

The placeholder attribute is used to specify a short hint that describes the expected value of an input field. It is displayed in the input field before the user enters a value. It works with the following input types: text, search, tel, url, password and email.

Example:

<form action="/sample_page.php">
<input type="text" name="fname" placeholder="Enter your First Name"><br><br>
<input type="text" name="lname" placeholder="Enter your Last name"><br><br>
<input type="submit" value="Submit">
</form>
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The required Attribute:

The required attribute is used to specify that the input field must be filled out before submitting the form. It works with the following input types: text, number, radio, checkbox, password, etc.

Example:

<form action="/sample_page.php">
Username: <input type="text" name="usrname" required><br><br>
Password: <input type="password" name="password" required><br>
<input type="submit">
</form>
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The step Attribute:

The step attribute is used to set the legal number of intervals for an <input> element. Steps are the number of steps like 0, 2,4, 6,8, etc. It is used with the max and min attributes to create a legal range of legal values.

Example:

<form action = "/sample_page.php">
<input type = "number" name = "points" step = "4">
<input type = "submit" value = "Submit">
</form>
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