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Chromium HTML5 新的 Input 类型number对应c++

news 2025/5/9 0:21:41

一、Input 类型: number

number 类型用于应该包含数值的输入域。

您还能够设定对所接受的数字的限定：

<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>test</title> 
</head>
<body><form action="demo-form.php">数量 ( 1 到 5 之间): <input type="number" name="quantity" min="1" max="5"><input type="submit">
</form><p><b>注意:</b>Internet Explorer 9 及更早 IE 版本不支持 type="number" 。</p></body>
</html>

二、c++定义：

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

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

namespace blink {class ExceptionState;class NumberInputType final : public TextFieldInputType {public:explicit NumberInputType(HTMLInputElement& element): TextFieldInputType(Type::kNumber, element) {}bool TypeMismatchFor(const String&) const;private:void CountUsage() override;void SetValue(const String&,bool value_changed,TextFieldEventBehavior,TextControlSetValueSelection) override;double ValueAsDouble() const override;void SetValueAsDouble(double,TextFieldEventBehavior,ExceptionState&) const override;void SetValueAsDecimal(const Decimal&,TextFieldEventBehavior,ExceptionState&) const override;bool TypeMismatch() const override;bool SizeShouldIncludeDecoration(int default_size,int& preferred_size) const override;StepRange CreateStepRange(AnyStepHandling) const override;void HandleKeydownEvent(KeyboardEvent&) override;void HandleBeforeTextInsertedEvent(BeforeTextInsertedEvent&) override;Decimal ParseToNumber(const String&, const Decimal&) const override;String Serialize(const Decimal&) const override;String LocalizeValue(const String&) const override;String VisibleValue() const override;String ConvertFromVisibleValue(const String&) const override;String SanitizeValue(const String&) const override;void WarnIfValueIsInvalid(const String&) const override;bool HasBadInput() const override;String BadInputText() const override;String ValueNotEqualText(const Decimal& value) const override;String RangeOverflowText(const Decimal& maxmum) const override;String RangeUnderflowText(const Decimal& minimum) const override;String RangeInvalidText(const Decimal& minimum,const Decimal& maximum) const override;bool SupportsPlaceholder() const override;void MinOrMaxAttributeChanged() override;void StepAttributeChanged() override;bool SupportsSelectionAPI() const override;
};template <>
struct DowncastTraits<NumberInputType> {static bool AllowFrom(const InputType& type) {return type.IsNumberInputType();}
};}  // namespace blink

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