{{APIRef("HTML DOM")}}
Inheritance Hierarchy:
{{domxref("Node")}} <== {{domxref("Element")}}<== {{domxref("HTMLElement")}} <== {{domxref("HTMLFormElement")}},
{{domxref("EventTarget")}} <== {{domxref("HTMLFormElement")}}
The HTMLFormElement interface provides methods to create and modify {{HTMLElement("form")}} elements.
document.forms - returns an array of HTMLFormElement objects referencing all forms on the page.
document.forms[index] - returns an HTMLFormElement object referencing the form at the specified index.
document.forms['id'] - returns an HTMLFormElement object referencing the form with the specified id.
document.forms['name'] - returns an HTMLFormElement object referencing the form with the specified id.
Properties
| elements {{readonlyinline}} | {{domxref("HTMLFormControlsCollection")}}: Returns all form controls belonging to this form element. |
| length {{readonlyinline}} | long: Returns the number of controls in the form. |
| name | string: Returns / Sets the value of the form's {{ htmlattrxref("name", "form") }} HTML attribute, containing the name of the form. |
| method | string: Returns / Sets the value of the form's {{ htmlattrxref("method", "form") }} HTML attribute, indicating the HTTP method used to submit the form. Only specified values can be set. |
| target | string: Returns / Sets the value of the form's {{ htmlattrxref("target", "form") }} HTML attribute, indicating where to display the results received from submitting the form. |
| action | string: Returns / Sets the value of the form's {{ htmlattrxref("action", "form") }} HTML attribute, containing the URI of a program that processes the information submitted by the form. |
string: Returns / Sets the value of the form's {{ htmlattrxref("enctype", "form") }} HTML attribute, indicating the type of content that is used to transmit the form to the server. Only specified values can be set. The two methods are synonyms. |
|
| acceptCharset | string: Returns / Sets the value of the form's {{ htmlattrxref("accept-charset", "form") }} HTML attribute, representing the character encoding that the server accepts. |
| autocomplete | string: Returns / Sets the value of the form's {{ htmlattrxref("autocomplete", "form") }} HTML attribute, indicating whether the controls in this form can have their values automatically populated by the browser. |
| noValidate | boolean: Returns / Sets the value of the form's {{ htmlattrxref("novalidate", "form") }} HTML attribute, indicating whether the form should not be validated. |
Methods
| submit() | Submits the form to the server. |
| reset() | Resets the form to its initial state. |
| checkValidity() | boolean: Returns true if the element's child controls are subject to constraint validation and satisfy those contraints; returns false if some controls do not satisfy their constraints. Fires an event named {{event("invalid")}} at any control that does not satisfy its constraints; such controls are considered invalid if the event is not canceled. It is up to the programmer to decide how to respond to false. |
| HTMLFormElement.reportValidity() | boolean: Returns true if the element's child controls satisfy their validation constraints. When false is returned, cancelable invalid events are fired for each invalid child and validation problems are reported to the user. |
| requestAutocomplete() | Triggers a native browser interface to assist the user in completing the fields which have an autofill field name value that is not off or on. The form will receive an event once the user has finished with the interface, the event will either be {{event("autocomplete")}} when the fields have been filled or {{event("autocompleteerror")}} when there was a problem. |
See also:
Examples
Create a new form element, modify its attributes and submit it:
var f = document.createElement("form");// Create a form
document.body.appendChild(f); // Add it to the document body
f.action = "/cgi-bin/some.cgi"; // Add action and method attributes
f.method = "POST"
f.submit(); // Call the form's submit method
Extract information from a form element and set some of its attributes:
<form name="formA" id="formA" action="/cgi-bin/test" method="POST">
<p>Click "Info" for form details; "Set" to change settings.</p>
<p>
<input type="button" value="info" onclick="getFormInfo();">
<input type="button" value="set" onclick="setFormInfo(this.form);">
<input type="reset" value="reset"><br>
<textarea id="tex" style="height:15em; width:20em"></textarea>
</p>
</form>
<script type="text/javascript">
function getFormInfo(){
var info;
var f = document.forms["formA"]; //Get a reference to the form via id.
info = "elements: " + f.elements + "\n"
+ "length: " + f.length + "\n"
+ "name: " + f.name + "\n"
+ "charset: " + f.acceptCharset+ "\n"
+ "action: " + f.action + "\n"
+ "enctype: " + f.enctype + "\n"
+ "encoding: " + f.encoding + "\n"
+ "method: " + f.method + "\n"
+ "target: " + f.target;
document.forms["formA"].elements['tex'].value = info;
}
function setFormInfo(f){ //Argument is a reference to the form.
f.method = "GET";
f.action = "/cgi-bin/evil_executable.cgi";
f.name = "totally_new";
}
</script>
Submit a form in a popup window:
<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>MDN Example</title>
<script type="text/javascript">
function popupSend (oFormElement) {
if (oFormElement.method && oFormElement.method.toLowerCase() !== "get") {
alert("This script supports the GET method only.");
return;
}
var oField, sFieldType, nFile, sSearch = "";
for (var nItem = 0; nItem < oFormElement.elements.length; nItem++) {
oField = oFormElement.elements[nItem];
if (!oField.hasAttribute("name")) { continue; }
sFieldType = oField.nodeName.toUpperCase() === "INPUT" ? oField.getAttribute("type").toUpperCase() : "TEXT";
if (sFieldType === "FILE") {
for (nFile = 0; nFile < oField.files.length; sSearch += "&" + escape(oField.name) + "=" + escape(oField.files[nFile++].name));
} else if ((sFieldType !== "RADIO" && sFieldType !== "CHECKBOX") || oField.checked) {
sSearch += "&" + escape(oField.name) + "=" + escape(oField.value);
}
}
open(oFormElement.action.replace(/(?:\?.*)?$/, sSearch.replace(/^&/, "?")), "submit-" + (oFormElement.name || Math.floor(Math.random() * 1e6)), "resizable=yes,scrollbars=yes,status=yes");
}
</script>
</head>
<body>
<form name="yourForm" action="test.php" method="get" onsubmit="popupSend(this); return false;">
<p>First name: <input type="text" name="firstname" /><br />
Last name: <input type="text" name="lastname" /><br />
Password: <input type="password" name="pwd" /><br />
<input type="radio" name="sex" value="male" /> Male <input type="radio" name="sex" value="female" /> Female</p>
<p><input type="checkbox" name="vehicle" value="Bike" />I have a bike<br />
<input type="checkbox" name="vehicle" value="Car" />I have a car</p>
<p><input type="submit" value="Submit" /></p>
</form>
</body>
</html>
Submitting forms and uploading files using XMLHttpRequest
If you want to know how to serialize and submit a form using the XMLHttpRequest API, please read this paragraph.
Specifications
| Specification | Status | Comment |
|---|---|---|
| {{SpecName('HTML WHATWG', "forms.html#the-form-element", "HTMLFormElement")}} | {{Spec2('HTML WHATWG')}} |
The following method has been added: |
| {{SpecName('HTML5 W3C', "forms.html#the-form-element", "HTMLFormElement")}} | {{Spec2('HTML5 W3C')}} | The elements properties returns an {{domxref("HTMLFormControlsCollection")}} instead of a raw {{domxref("HTMLCollection")}}. This is mainly a technical change. The following method has been added: checkValidity(). The following properties have been added: autocomplete, noValidate, and encoding. |
| {{SpecName('DOM2 HTML', 'html.html#ID-40002357', 'HTMLFormElement')}} | {{Spec2('DOM2 HTML')}} | No change from {{SpecName("DOM1")}}. |
| {{SpecName('DOM1', 'level-one-html.html#ID-40002357', 'HTMLFormElement')}} | {{Spec2('DOM1')}} | Initial definition. |
Browser compatibility
{{CompatibilityTable}}
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | {{CompatVersionUnknown}} | {{CompatGeckoDesktop(1.0)}} | {{CompatVersionUnknown}} | {{CompatVersionUnknown}} | {{CompatVersionUnknown}} |
| Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | {{CompatVersionUnknown}} | {{CompatGeckoMobile(1.0)}} | {{CompatVersionUnknown}} | {{CompatVersionUnknown}} | {{CompatVersionUnknown}} |
See also
- The HTML element implementing this interface: {{ HTMLElement("form") }}.