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HTML4 Reference

HTML <input /> tag

Definition

The <input /> tag is a self closing tag that is used along with its type attribute to define an area of the form for user input. The type of the input element can be a button, checkbox, file, hidden, image, password, radio, reset, submit or text.

Example


<form action="htmlintermediate/simpleform.html" method="get">
  <p>Name:<input type="text" name="name" /></p>
  <p>Which pie do you prefer?:</p>
  <p><input type="radio" name="pie" checked="checked" value="chicken" /> Chicken</p>
  <p><input type="radio" name="pie" value="fish" />; Fish</p>
  <p><input type="radio" name="pie" value="shepherds" /> Shepherds</p>
  <p>Submit your information:</p>
  <p><input type="submit" value="Submit" /></p>
</form>

Required Attributes

NONE

Optional Attributes

accept - limited browser support - use the server to validate file uploads.

align - this attribute is deprecated, use CSS instead.

alt - attribute specifies an alternate text for the image (provides information if the image cannot be loaded).

Only used when the type attribute value is image.


<input type="image"
       src="http://htmldoctor.info/images/chickenpiesmall.jpg"
       alt="Chicken Pie" />

checked - specifies a preselected state for a checkbox or radio button when the page loads.

Only used when the type attribute value is checkbox or radio.


<!-- Checkbox button example -->
<input type="checkbox" name="pie" value="Chicken" id="chicken" checked="checked" />
<input type="checkbox" name="pie" value="Fish" id="fish" />

<!-- Radio button example -->
<input type="radio" name="pie" value="Chicken" id="chicken" />
<input type="radio" name="pie" value="Fish" id="fish" checked="checked" />

disabled - specifies an input element to be disabled until a certain condition occurs.

Works with all type attribute values except password.


<input type="text" name="name" disabled="disabled" />

maxlength - specifies an input elements maximum character length.

Only used when the type attribute value is text or password.


<input type="text" name="name" maxlength="50" />

name - specifies a name for the input element.

Allows the server or some JavaScript to identify the data.


<input type="text" name="someName" />

readonly - specifies that an input field is protected and not modifiable.

.

Works with all type attribute values except password.


<input type="text" readonly="readonly" />

src - specifies attribute specifies the URL of the image (the actual location where the image is stored).

Only used when the type attribute value is image.


<input type="image"
       src="http://htmldoctor.info/images/chickenpiesmall.jpg"
       alt="Chicken Pie" />

type - specifies the type of input element.


<input type="button" value="Click" />
<input type="checkbox" name="pie" value="Chicken" id="chicken" />
<input type="hidden" value="someValue" />
<input type="image"
       src="http://htmldoctor.info/images/chickenpiesmall.jpg"
       alt="Chicken Pie" 
       value="Chicken" />
<input type="radio" name="pie" value="Chicken" id="chicken" />
<input type="reset" value="Reset" />
<input type="password" value="someValue" />
<input type="submit" value="Submit" />
<input type="text" value="someValue" />

value - specifies a default value dependant on input type.

Works with all type attribute values except file.


<!-- defines the text viewable on the button -->
<input type="button" value="Click" />
<input type="reset" value="Reset" />
<input type="submit" value="Submit" />

<!-- defines the default value of a text field -->
<input type="password" value="someValue" />
<input type="hidden" value="someValue" />
<input type="text" value="someValue" />

<!-- defines the value related to the input field -->
<!-- ** the value will be passed to the server on form submission ** -->
<!-- ** the value attribute is mandatory for checkbox and radio input types ** -->
<input type="checkbox" name="pie" value="Chicken" id="chicken" />
<input type="radio" name="pie" value="Chicken" id="chicken" />
<input type="image"
       src="http://htmldoctor.info/images/chickenpiesmall.jpg"
       alt="Chicken Pie" 
       value="Chicken" />

Common Attributes

accesskey - specifies a keyboard shortcut to an element.


<input accesskey="aKey" />

class - specifies a classname for the element allowing you to apply the style of the predefined class to the content.


<input class="classname" />

id - specifies a unique id for the element allowing you to apply the style of the predefined id to the content.


<input id="idname" />

style - specifies an inline style for the element allowing you to apply the style to the content.


<input style="color:red;text-align:left" />

tabindex - specifies the tab order of the element.


<input tabindex="2" />

title - specifies extra information about the content.


<input title="information about the content" />

Language Attributes

dir - specifies the directional flow of the content.


<!-- The text will flow from left to right -->
<input dir="ltr" />

<!-- The text will flow from right to left -->
<input dir="rtl" />

lang - specifies a language code for the content of the element.


<input lang="en" />

xml:lang - specifies a language code for the content of the element in XHTML documents.


<input xml:lang="fr" />

Document Event Attributes

NONE

Form Event Attributes

onblur - The JavaScript code to be run when an element loses focus.


<!-- Executes the go() function -->
<input onblur="go()" />

onchange - The JavaScript code to be run when an element changes.


<!-- Executes the go() function -->
<input onchange="go()" />

onfocus - The JavaScript code to be run when an element gains focus.


<!-- Executes the go() function -->
<input onfocus="go()" />

onselect - The JavaScript code to be run when an element is selected.


<!-- Executes the go() function -->
<input onselect="go()" />

Image Event Attributes

NONE

Keyboard Event Attributes

onkeydown - The JavaScript code to be run when an element is in focus and keyboard key is pressed down and released.


<!-- Executes the go() function -->
<input onkeydown="go()" />

onkeypress - The JavaScript code to be run when an element is in focus and keyboard key is pressed down and released.


<!-- Executes the go() function -->
<input onkeydown="go()" />

onkeyup - The JavaScript code to be run when an element is in focus and keyboard key is released.


<!-- Executes the go() function -->
<input onkeydown="go()" />

Mouse Event Attributes

onclick - The JavaScript code to be run when a mouse is clicked on the element.


<!-- Executes the go() function -->
<input onclick="go()" />

ondblclick - The JavaScript code to be run when a mouse is double clicked on the element.


<!-- Executes the go() function -->
<input ondblclick="go()" />

onmousedown - The JavaScript code to be run when the mouse button is pressed down while the cursor is over the element.


<!-- Executes the go() function -->
<input onmousedown="go()" />

onmousemove - The JavaScript code to be run when the mouse button is moved.


<input onmousemove="go()" />

onmouseout - The JavaScript code to be run when the mouse cursor moves off an element.


<!-- Executes the go() function -->
<input onmouseout="go()" />

onmouseover - The JavaScript code to be run when the mouse cursor moves over an element.


<!-- Executes the go() function -->
<input onmouseover="go()" />

onmouseup - The JavaScript code to be run when the mouse button is released while the cursor is over the element.


<!-- Executes the go() function -->
<input onmouseup="go()" />
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HTML Elements

The complete set of HTML elements also known as HTML tags from the latest HTML 4.01 Specification.

Click the links for more information on individual tags and their attributes.

<!--...-->

<!DOCTYPE>

<a>

<abbr>

<acronym>

<address>

<applet>

<area />

<b>

<base />

<basefont />

<bdo>

<big>

<blockquote>

<body>

<br />

<button>

<caption>

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<cite>

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<col />

<colgroup>

<dd>

<del>

<dfn>

<dir>

<div>

<dl>

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<fieldset>

<font>

<form>

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<frameset>

<h1> - <h6>

<head>

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<html>

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<img />

<input />

<ins>

<isindex />

<kbd>

<label>

<legend>

<li>

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<map>

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<noframes>

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<object>

<ol>

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<s>

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<table>

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<textarea>

<tfoot>

<th>

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<title>

<tr>

<tt>

<u>

<ul>

<var>