Java tutorial
/* * Copyright 2008 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ package com.google.gwt.dom.client; import com.google.gwt.core.client.JavaScriptObject; import com.google.gwt.safehtml.shared.SafeUri; import com.google.gwt.safehtml.shared.annotations.IsSafeUri; /** * The FORM element encompasses behavior similar to a collection and an element. * It provides direct access to the contained form controls as well as the * attributes of the form element. * * @see <a href= * "http://www.w3.org/TR/1999/REC-html401-19991224/interact/forms.html#edef-FORM"> * W3C HTML Specification</a> */ @TagName(FormElement.TAG) public class FormElement extends Element { public static final String TAG = "form"; /** * Assert that the given {@link Element} is compatible with this class and * automatically typecast it. */ public static FormElement as(Element elem) { assert is(elem); return (FormElement) elem; } /** * Determine whether the given {@link Element} can be cast to this class. A * <code>null</code> node will cause this method to return * <code>false</code>. */ public static boolean is(Element elem) { return elem != null && elem.hasTagName(TAG); } /** * Determines whether the given {@link JavaScriptObject} can be cast to this * class. A <code>null</code> object will cause this method to return * <code>false</code>. */ public static boolean is(JavaScriptObject o) { if (Element.is(o)) { return is(Element.as(o)); } return false; } /** * Determine whether the given {@link Node} can be cast to this class. A * <code>null</code> node will cause this method to return * <code>false</code>. */ public static boolean is(Node node) { if (Element.is(node)) { return is((Element) node); } return false; } protected FormElement() { } /** * List of character sets supported by the server. * * @see <a href= * "http://www.w3.org/TR/1999/REC-html401-19991224/interact/forms.html#adef-accept-charset"> * W3C HTML Specification</a> */ public final String getAcceptCharset() { return getPropertyString("acceptCharset"); } /** * Server-side form handler. * * @see <a href= * "http://www.w3.org/TR/1999/REC-html401-19991224/interact/forms.html#adef-action"> * W3C HTML Specification</a> */ public final String getAction() { return getPropertyString("action"); } /** * Returns a collection of all form control elements in the form. */ public final NodeCollection<Element> getElements() { throw new FixmeUnsupportedOperationException(); } /** * The content type of the submitted form, generally * "application/x-www-form-urlencoded". * * Note: The onsubmit even handler is not guaranteed to be triggered when * invoking this method. The behavior is inconsistent for historical reasons * and authors should not rely on a particular one. * * @see <a href= * "http://www.w3.org/TR/1999/REC-html401-19991224/interact/forms.html#adef-enctype"> * W3C HTML Specification</a> */ public final String getEnctype() { return getPropertyString("enctype"); } /** * HTTP method [IETF RFC 2616] used to submit form. * * @see <a href= * "http://www.w3.org/TR/1999/REC-html401-19991224/interact/forms.html#adef-method"> * W3C HTML Specification</a> */ public final String getMethod() { return getPropertyString("method"); } /** * Names the form. */ public final String getName() { return getPropertyString("name"); } /** * Frame to render the resource in. * * @see <a href= * "http://www.w3.org/TR/1999/REC-html401-19991224/present/frames.html#adef-target"> * W3C HTML Specification</a> */ public final String getTarget() { return getPropertyString("target"); } public final void reset() { callMethod("reset"); } /** * List of character sets supported by the server. * * @see <a href= * "http://www.w3.org/TR/1999/REC-html401-19991224/interact/forms.html#adef-accept-charset"> * W3C HTML Specification</a> */ public final void setAcceptCharset(String acceptCharset) { setPropertyString("acceptCharset", acceptCharset); } /** * Server-side form handler. * * @see <a href= * "http://www.w3.org/TR/1999/REC-html401-19991224/interact/forms.html#adef-action"> * W3C HTML Specification</a> */ public final void setAction(SafeUri action) { setAction(action.asString()); } /** * Server-side form handler. * * @see <a href= * "http://www.w3.org/TR/1999/REC-html401-19991224/interact/forms.html#adef-action"> * W3C HTML Specification</a> */ public final void setAction(@IsSafeUri String action) { setPropertyString("action", action); } /** * The content type of the submitted form, generally * "application/x-www-form-urlencoded". * * Note: The onsubmit even handler is not guaranteed to be triggered when * invoking this method. The behavior is inconsistent for historical reasons * and authors should not rely on a particular one. * * @see <a href= * "http://www.w3.org/TR/1999/REC-html401-19991224/interact/forms.html#adef-enctype"> * W3C HTML Specification</a> */ public final void setEnctype(String enctype) { setPropertyString("enctype", enctype); } /** * HTTP method [IETF RFC 2616] used to submit form. * * @see <a href= * "http://www.w3.org/TR/1999/REC-html401-19991224/interact/forms.html#adef-method"> * W3C HTML Specification</a> */ public final void setMethod(String method) { setPropertyString("method", method); } /** * Names the form. */ public final void setName(String name) { setPropertyString("name", name); } /** * Frame to render the resource in. * * @see <a href= * "http://www.w3.org/TR/1999/REC-html401-19991224/present/frames.html#adef-target"> * W3C HTML Specification</a> */ public final void setTarget(String target) { setPropertyString("target", target); } /** * Submits the form. It performs the same action as a submit button. */ public final void submit() { callMethod("submit"); } }