1 /* 2 * Copyright (c) 2010 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "config.h" 32 #include "core/html/HTMLOutputElement.h" 33 34 #include "bindings/core/v8/ExceptionStatePlaceholder.h" 35 #include "core/HTMLNames.h" 36 37 namespace blink { 38 39 inline HTMLOutputElement::HTMLOutputElement(Document& document, HTMLFormElement* form) 40 : HTMLFormControlElement(HTMLNames::outputTag, document, form) 41 , m_isDefaultValueMode(true) 42 , m_defaultValue("") 43 , m_tokens(DOMSettableTokenList::create()) 44 { 45 } 46 47 PassRefPtrWillBeRawPtr<HTMLOutputElement> HTMLOutputElement::create(Document& document, HTMLFormElement* form) 48 { 49 return adoptRefWillBeNoop(new HTMLOutputElement(document, form)); 50 } 51 52 const AtomicString& HTMLOutputElement::formControlType() const 53 { 54 DEFINE_STATIC_LOCAL(const AtomicString, output, ("output", AtomicString::ConstructFromLiteral)); 55 return output; 56 } 57 58 bool HTMLOutputElement::supportsFocus() const 59 { 60 return HTMLElement::supportsFocus(); 61 } 62 63 void HTMLOutputElement::parseAttribute(const QualifiedName& name, const AtomicString& value) 64 { 65 if (name == HTMLNames::forAttr) 66 setFor(value); 67 else 68 HTMLFormControlElement::parseAttribute(name, value); 69 } 70 71 DOMSettableTokenList* HTMLOutputElement::htmlFor() const 72 { 73 return m_tokens.get(); 74 } 75 76 void HTMLOutputElement::setFor(const AtomicString& value) 77 { 78 m_tokens->setValue(value); 79 } 80 81 void HTMLOutputElement::childrenChanged(const ChildrenChange& change) 82 { 83 HTMLFormControlElement::childrenChanged(change); 84 85 if (m_isDefaultValueMode) 86 m_defaultValue = textContent(); 87 } 88 89 void HTMLOutputElement::resetImpl() 90 { 91 // The reset algorithm for output elements is to set the element's 92 // value mode flag to "default" and then to set the element's textContent 93 // attribute to the default value. 94 if (m_defaultValue == value()) 95 return; 96 setTextContent(m_defaultValue); 97 m_isDefaultValueMode = true; 98 } 99 100 String HTMLOutputElement::value() const 101 { 102 return textContent(); 103 } 104 105 void HTMLOutputElement::setValue(const String& value) 106 { 107 // The value mode flag set to "value" when the value attribute is set. 108 m_isDefaultValueMode = false; 109 if (value == this->value()) 110 return; 111 setTextContent(value); 112 } 113 114 String HTMLOutputElement::defaultValue() const 115 { 116 return m_defaultValue; 117 } 118 119 void HTMLOutputElement::setDefaultValue(const String& value) 120 { 121 if (m_defaultValue == value) 122 return; 123 m_defaultValue = value; 124 // The spec requires the value attribute set to the default value 125 // when the element's value mode flag to "default". 126 if (m_isDefaultValueMode) 127 setTextContent(value); 128 } 129 130 131 void HTMLOutputElement::trace(Visitor* visitor) 132 { 133 visitor->trace(m_tokens); 134 HTMLFormControlElement::trace(visitor); 135 } 136 137 } // namespace 138