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Chromium html＜textarea＞c++接口定义

news 2026/4/7 23:03:02

<textarea>：文本区域元素

<textarea> HTML 元素是一个多行纯文本编辑控件，适用于允许用户输入大量自由格式文本的场景。

例子：

<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>test</title> 
</head>
<body><textarea rows="100" cols="300">
我是一个textarea文本框。
</textarea></body>
</html>

1、<textarea>在html_tag_names.json5中定义：

    {name: "textarea",interfaceName: "HTMLTextAreaElement",interfaceHeaderDir: "third_party/blink/renderer/core/html/forms",}

2、<textarea> 在third_party\blink\renderer\core\html\forms\html_text_area_element.idl中定义：

// https://html.spec.whatwg.org/C/#the-textarea-element
[Exposed=Window,HTMLConstructor
] interface HTMLTextAreaElement : HTMLElement {[CEReactions, ImplementedAs=IDLExposedAutofillValue] attribute DOMString autocomplete;[CEReactions] attribute unsigned long cols;[CEReactions, Reflect] attribute DOMString dirName;[CEReactions, Reflect] attribute boolean disabled;[ImplementedAs=formOwner] readonly attribute HTMLFormElement? form;[CEReactions, RaisesException=Setter] attribute long maxLength;[CEReactions, RaisesException=Setter] attribute long minLength;[CEReactions, Reflect] attribute DOMString name;[CEReactions, Reflect] attribute DOMString placeholder;[CEReactions, Reflect] attribute boolean readOnly;[CEReactions, Reflect] attribute boolean required;[CEReactions] attribute unsigned long rows;[CEReactions, Reflect] attribute DOMString wrap;readonly attribute DOMString type;[CEReactions] attribute DOMString defaultValue;[CEReactions, ImplementedAs=valueForBinding] attribute [LegacyNullToEmptyString] DOMString value;readonly attribute unsigned long textLength;readonly attribute boolean willValidate;readonly attribute ValidityState validity;readonly attribute DOMString validationMessage;boolean checkValidity();boolean reportValidity();void setCustomValidity(DOMString error);readonly attribute NodeList labels;void select();attribute unsigned long selectionStart;attribute unsigned long selectionEnd;attribute DOMString selectionDirection;[RaisesException] void setRangeText(DOMString replacement);[RaisesException] void setRangeText(DOMString replacement,unsigned long start,unsigned long end,optional SelectionMode selectionMode = "preserve");[ImplementedAs=setSelectionRangeForBinding]void setSelectionRange(unsigned long start,unsigned long end,optional DOMString direction);
};

3、html_text_area_element.idl接口blink实现：

third_party\blink\renderer\core\html\forms\html_text_area_element.h

third_party\blink\renderer\core\html\forms\html_text_area_element.cc

class CORE_EXPORT HTMLTextAreaElement final : public TextControlElement {DEFINE_WRAPPERTYPEINFO();public:explicit HTMLTextAreaElement(Document&);unsigned cols() const { return cols_; }unsigned rows() const { return rows_; }bool ShouldWrapText() const { return wrap_ != kNoWrap; }String Value() const override;void SetValue(const String&,TextFieldEventBehavior = TextFieldEventBehavior::kDispatchNoEvent,TextControlSetValueSelection =TextControlSetValueSelection::kSetSelectionToEnd,WebAutofillState = WebAutofillState::kNotFilled) override;String valueForBinding() const { return Value(); }void setValueForBinding(const String&);String defaultValue() const;void setDefaultValue(const String&);int textLength() const { return Value().length(); }// Sets the suggested value and puts the element into// WebAutofillState::kPreviewed state if |value| is non-empty, or// WebAutofillState::kNotFilled otherwise.// A null value indicates that the suggested value should be hidden.void SetSuggestedValue(const String& value) override;// For ValidityStateString validationMessage() const override;bool ValueMissing() const override;bool TooLong() const override;bool TooShort() const override;bool IsValidValue(const String&) const;void setCols(unsigned);void setRows(unsigned);String DefaultToolTip() const override;..........................................
};

4、html_text_area_element.idl接口v8实现：

out\Debug\gen\third_party\blink\renderer\bindings\core\v8\v8_html_text_area_element.h

out\Debug\gen\third_party\blink\renderer\bindings\core\v8\v8_html_text_area_element.cc

v8::Local<v8::Signature> signature = v8::Signature::New(isolate, interface_function_template);
{static const IDLMemberInstaller::AttributeConfig kAttributeTable[] = {
{"autocomplete", AutocompleteAttributeGetCallback, AutocompleteAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"cols", ColsAttributeGetCallback, ColsAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"dirName", DirNameAttributeGetCallback, DirNameAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"disabled", DisabledAttributeGetCallback, DisabledAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"form", FormAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"maxLength", MaxLengthAttributeGetCallback, MaxLengthAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"minLength", MinLengthAttributeGetCallback, MinLengthAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"name", NameAttributeGetCallback, NameAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"placeholder", PlaceholderAttributeGetCallback, PlaceholderAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"readOnly", ReadOnlyAttributeGetCallback, ReadOnlyAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"required", RequiredAttributeGetCallback, RequiredAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"rows", RowsAttributeGetCallback, RowsAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"wrap", WrapAttributeGetCallback, WrapAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"type", TypeAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"defaultValue", DefaultValueAttributeGetCallback, DefaultValueAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"value", ValueAttributeGetCallback, ValueAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"textLength", TextLengthAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"willValidate", WillValidateAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"validity", ValidityAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"validationMessage", ValidationMessageAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"labels", LabelsAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"selectionStart", SelectionStartAttributeGetCallback, SelectionStartAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"selectionEnd", SelectionEndAttributeGetCallback, SelectionEndAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
{"selectionDirection", SelectionDirectionAttributeGetCallback, SelectionDirectionAttributeSetCallback, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
};
IDLMemberInstaller::InstallAttributes(isolate, world, instance_template, prototype_template, interface_template, signature, kAttributeTable);
}

Chromium html＜textarea＞c++接口定义

<textarea>：文本区域元素 <textarea> HTML 元素是一个多行纯文本编辑控件，适用于允许用户输入大量自由格式文本的场景。例子： <!DOCTYPE html> <html> <head> <meta charset"utf-8"> &l…...

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