OpenHarmony语言基础类库【@ohos.xml (xml解析与生成)】
将XML文本转换为JavaScript对象、以及XML文件生成和解析的一系列接口。
说明:
本模块首批接口从APIversion 8开始支持。后续版本的新增接口,采用上角标单独标记接口的起始版本。
导入模块
import xml from '@ohos.xml';
XmlSerializer
XmlSerializer接口用于生成XML文件。
constructor
constructor(buffer: ArrayBuffer | DataView, encoding?: string)
XmlSerializer的构造函数。
系统能力:SystemCapability.Utils.Lang
参数:
参数名 |
类型 |
必填 |
说明 |
---|---|---|---|
buffer |
ArrayBuffer |
DataView |
是 |
encoding |
string |
否 |
编码格式 , 默认'utf-8'(目前仅支持'utf-8')。 |
鸿蒙开发指导文档:gi
tee.com/li-shizhen-skin/harmony-os/blob/master/README.md点击或者复制转到。
示例:
let arrayBuffer = new ArrayBuffer(2048);let thatSer = new xml.XmlSerializer(arrayBuffer, "utf-8");
thatSer.setDeclaration();let result = '< ?xml version="1.0" encoding="utf-8"? >';let view = new Uint8Array(arrayBuffer);let view1 = "";for (let i = 0; i < result.length; ++i) {
view1 = view1 + String.fromCodePoint(view[i]);
}console.log(view1) // < ?xml version="1.0" encoding="utf-8"? >
setAttributes
setAttributes(name: string, value: string): void
设置Attributes方法。
系统能力:SystemCapability.Utils.Lang
参数:
参数名 |
类型 |
必填 |
说明 |
---|---|---|---|
name |
string |
是 |
属性的key值。 |
value |
string |
是 |
属性的value值。 |
示例:
const MY_MAX = 2048;let arrayBuffer = new ArrayBuffer(MY_MAX);let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.startElement("note");
thatSer.setAttributes("importance1", "high1");
thatSer.endElement();let result = '< note importance1="high1"/ >';let view = new Uint8Array(arrayBuffer);let view1 = "";for (let i = 0; i < result.length; ++i) {
view1 = view1 + String.fromCodePoint(view[i]);
}console.log(view1) // < note importance1="high1"/ >
addEmptyElement
addEmptyElement(name: string): void
写入一个空元素。
系统能力:SystemCapability.Utils.Lang
参数:
参数名 |
类型 |
必填 |
说明 |
---|---|---|---|
name |
string |
是 |
该空元素的元素名。 |
示例:
const MY_MAX = 2048;let arrayBuffer = new ArrayBuffer(MY_MAX);let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.addEmptyElement("d");let result = '< d/ >';let view = new Uint8Array(arrayBuffer);let view1 = "";for (let i = 0; i < result.length; ++i) {
view1 = view1 + String.fromCodePoint(view[i]);
}console.log(view1) // < d/ >
setDeclaration
setDeclaration(): void
编写带有编码的文件声明。
系统能力:SystemCapability.Utils.Lang
示例:
const MY_MAX = 2048;let arrayBuffer = new ArrayBuffer(MY_MAX);let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDeclaration();
thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
thatSer.startElement("note");
thatSer.endElement();let result = '< ?xml version="1.0" encoding="utf-8"? >rn< h:note xmlns:h="http://www.w3.org/TR/html4/"/ >';let view = new Uint8Array(arrayBuffer);let view1 = "";for (let i = 0; i < result.length; ++i) {
view1 = view1 + String.fromCodePoint(view[i]);
}console.log(view1)// < ?xml version="1.0" encoding="utf-8"? >
// < h:note xmlns:h="http://www.w3.org/TR/html4/"/ >
startElement
startElement(name: string): void
根据给定名称写入元素开始标记。
系统能力:SystemCapability.Utils.Lang
参数:
参数名 |
类型 |
必填 |
说明 |
---|---|---|---|
name |
string |
是 |
当前元素的元素名。 |
示例:
const MY_MAX = 2048;let arrayBuffer = new ArrayBuffer(MY_MAX);let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDeclaration();
thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
thatSer.startElement("note");
thatSer.endElement();let result = '< ?xml version="1.0" encoding="utf-8"? >rn< h:note xmlns:h="http://www.w3.org/TR/html4/"/ >';let view = new Uint8Array(arrayBuffer);let view1 = "";for (let i = 0; i < result.length; ++i) {
view1 = view1 + String.fromCodePoint(view[i]);
}console.log(JSON.stringify(view1)) // < ?xml version="1.0" encoding="utf-8"? >rn< h:note xmlns:h="http://www.w3.org/TR/html4/"/ >
endElement
endElement(): void
写入元素结束标记。
系统能力:SystemCapability.Utils.Lang
示例:
const MY_MAX = 2048;let arrayBuffer = new ArrayBuffer(MY_MAX);let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDeclaration();
thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
thatSer.startElement("note");
thatSer.endElement();let result = '< ?xml version="1.0" encoding="utf-8"? >rn< h:note xmlns:h="http://www.w3.org/TR/html4/"/ >';let view = new Uint8Array(arrayBuffer);let view1 = "";for (let i = 0; i < result.length; ++i) {
view1 = view1 + String.fromCodePoint(view[i]);
}console.log(JSON.stringify(view1)) // < ?xml version="1.0" encoding="utf-8"? >rn< h:note xmlns:h="http://www.w3.org/TR/html4/"/ >
setNamespace
setNamespace(prefix: string, namespace: string): void
写入当前元素标记的命名空间。
系统能力:SystemCapability.Utils.Lang
参数:
参数名 |
类型 |
必填 |
说明 |
---|---|---|---|
prefix |
string |
是 |
当前元素及其子元素的前缀。 |
namespace |
string |
是 |
当前元素及其子元素的命名空间。 |
示例:
const MY_MAX = 2048;let arrayBuffer = new ArrayBuffer(MY_MAX);let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDeclaration();
thatSer.setNamespace("h", "http://www.w3.org/TR/html4/");
thatSer.startElement("note");
thatSer.endElement();let result = '< ?xml version="1.0" encoding="utf-8"? >rn< h:note xmlns:h="http://www.w3.org/TR/html4/"/ >';let view = new Uint8Array(arrayBuffer);let view1 = "";for (let i = 0; i < result.length; ++i) {
view1 = view1 + String.fromCodePoint(view[i]);
}console.log(JSON.stringify(view1)) // < ?xml version="1.0" encoding="utf-8"? >rn< h:note xmlns:h="http://www.w3.org/TR/html4/"/ >
setComment
setComment(text: string): void
写入comment属性。
系统能力:SystemCapability.Utils.Lang
参数:
参数名 |
类型 |
必填 |
说明 |
---|---|---|---|
text |
string |
是 |
当前元素的注释内容。 |
示例:
const MY_MAX = 2048;let arrayBuffer = new ArrayBuffer(MY_MAX);let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setComment("Hello, World!");let result = '< !--Hello, World!-- >';let view = new Uint8Array(arrayBuffer);let view1 = "";for (let i = 0; i < result.length; ++i) {
view1 = view1 + String.fromCodePoint(view[i]);
}console.log(view1) // < !--Hello, World!-- >
setCDATA
setCDATA(text: string): void
写入CDATA属性。
系统能力:SystemCapability.Utils.Lang
参数:
参数名 |
类型 |
必填 |
说明 |
---|---|---|---|
text |
string |
是 |
CDATA属性的内容。 |
示例:
const MY_MAX = 2048;let arrayBuffer = new ArrayBuffer(MY_MAX);let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setCDATA('root SYSTEM')let result = '< ![CDATA[root SYSTEM]] >';let view = new Uint8Array(arrayBuffer);let view1 = "";for (let i = 0; i < result.length; ++i) {
view1 = view1 + String.fromCodePoint(view[i]);
}console.log(view1) // < ![CDATA[root SYSTEM]] >
[](https://gitee.com/openharmony/docs/blob/OpenHarmony-3.2-Release/zh-cn/application-dev/reference/apis/js-apis-xml.md#settext)setText
setText(text: string): void
设置Text方法。
系统能力:SystemCapability.Utils.Lang
参数:
参数名 |
类型 |
必填 |
说明 |
---|---|---|---|
text |
string |
是 |
text属性的内容。 |
示例:
const MY_MAX = 2048;let arrayBuffer = new ArrayBuffer(MY_MAX);let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.startElement("note");
thatSer.setAttributes("importance", "high");
thatSer.setText("Happy1");
thatSer.endElement();let result = '< note importance="high" >Happy1< /note >';let view = new Uint8Array(arrayBuffer);let view1 = "";for (let i = 0; i < result.length; ++i) {
view1 = view1 + String.fromCodePoint(view[i]);
}console.log(view1) // < note importance="high" >Happy1< /note >
setDocType
setDocType(text: string): void
写入DocType属性。
系统能力:SystemCapability.Utils.Lang
参数:
参数名 |
类型 |
必填 |
说明 |
---|---|---|---|
text |
string |
是 |
DocType属性的内容。 |
示例:
const MY_MAX = 2048;let arrayBuffer = new ArrayBuffer(MY_MAX);let thatSer = new xml.XmlSerializer(arrayBuffer);
thatSer.setDocType('root SYSTEM "http://www.test.org/test.dtd"');let result = '< !DOCTYPE root SYSTEM "http://www.test.org/test.dtd" >';let view = new Uint8Array(arrayBuffer);let view1 = "";for (let i = 0; i < result.length; ++i) {
view1 = view1 + String.fromCodePoint(view[i]);
}console.log(view1) // < !DOCTYPE root SYSTEM "http://www.test.org/test.dtd" >
XmlPullParser
XmlPullParser接口用于解析现有的XML文件。
constructor
constructor(buffer: ArrayBuffer | DataView, encoding?: string)
构造并返回一个XmlPullParser对象。
系统能力:SystemCapability.Utils.Lang
参数:
参数名 |
类型 |
必填 |
说明 |
---|---|---|---|
buffer |
ArrayBuffer |
DataView |
是 |
encoding |
string |
否 |
编码格式 , 默认'utf-8'(目前仅支持'utf-8')。 |
示例:
let strXml =
'< ?xml version="1.0" encoding="utf-8"? >' +
'< !DOCTYPE note [n< !ENTITY foo "baa" >] >' +
'< note importance="high" logged="true" >' +
' < ![CDATA[rnfuncrion matchwo(a,6)rn{rnreturn 1;rn}rn]] >' +
' < !--Hello, World!-- >' +
' < company >John & Hans< /company >' +
' < title >Happy< /title >' +
' < title >Happy< /title >' +
' < lens >Work< /lens >' +
' < lens >Play< /lens >' +
' < ?go there? >' +
' < a >< b/ >< /a >' +
' < h:table xmlns:h="http://www.w3.org/TR/html4/" >' +
' < h:tr >' +
' < h:td >Apples< /h:td >' +
' < h:td >Bananas< /h:td >' +
' < /h:tr >' +
' < /h:table >' +
'< /note >';let textEncoder = new util.TextEncoder();let arrbuffer = textEncoder.encodeInto(strXml);let that = new xml.XmlPullParser(arrbuffer.buffer, 'UTF-8');let str1 = '';function func1(name, value){
str1 += name+value;
return true;
}let options = {supportDoctype:true, ignoreNameSpace:true, tagValueCallbackFunction:func1}
that.parse(options);console.log(str1)// note [< !ENTITY foo "baa" >]note funcrion matchwo(a,6){return 1;} Hello, World! companyJohn amp;amp; Hanscompany titleHappytitle titleHappytitle lensWorklens lensPlaylens go there abba h:table h:tr h:tdApplesh:td h:tdBananash:td h:tr h:tablenote
parse
parse(option: ParseOptions): void
该接口用于解析xml。
系统能力:SystemCapability.Utils.Lang
参数:
参数名 |
类型 |
必填 |
说明 |
---|---|---|---|
option |
[ParseOptions] |
是 |
用户控制以及获取解析信息的选项。 |
示例:
let strXml =
'< ?xml version="1.0" encoding="utf-8"? >' +
'< note importance="high" logged="true" >' +
' < title >Happy< /title >' +
' < todo >Work< /todo >' +
' < todo >Play< /todo >' +
'< /note >';let textEncoder = new util.TextEncoder();let arrbuffer = textEncoder.encodeInto(strXml);let that = new xml.XmlPullParser(arrbuffer.buffer);let arrTag = {};let str = "";let i = 0;function func(key, value){
arrTag[i] = 'key:'+key+' value:'+ value.getDepth();
str += arrTag[i];
i++;
return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);console.log(str);// 输出:
// key:0 value:0key:2 value:1key:10 value:1key:2 value:2key:4 value:2key:3 value:2key:10 value:1key:2 value:2key:4 value:2key:3 value:2key:10 value:1key:2 value:2key:4 value:2key:3 value:2key:3 value:1key:1 value:0
// 解析:
// key代表了当前事件类型,value为当前解析的深度。你可以根据EVENTTYPE来知道具体的解析事件。例如本示例结果key: value代表含义为:
// 0(START_DOCUMENT):0(起始深度为0), 2(START_TAG):1(解析到开始标签node, 对应深度为1), 10(WHITESPACE):1(解析到空白标签空格, 对应深度为1), 2(START_TAG):2(解析到开始标签title, 对应深度为2), ...
ParseOptions
xml解析选项。
系统能力:以下各项对应的系统能力均为SystemCapability.Utils.Lang
名称 |
类型 |
必填 |
说明 |
---|---|---|---|
supportDoctype |
boolean |
否 |
是否忽略Doctype , 默认false。 |
ignoreNameSpace |
boolean |
否 |
是否忽略NameSpace,默认false。 |
tagValueCallbackFunction |
(name: string, value: string) => boolean |
否 |
获取tagValue回调函数 , 默认null。 |
attributeValueCallbackFunction |
(name: string, value: string) => boolean |
否 |
获取attributeValue回调函数 , 默认null。 |
tokenValueCallbackFunction |
(eventType: [EventType], value: [ParseInfo]) => boolean |
否 |
获取tokenValue回调函数, 默认null。 |
ParseInfo
当前xml解析信息。
getColumnNumber
getColumnNumber(): number
获取当前列号,从1开始。
系统能力:SystemCapability.Utils.Lang
返回值:
示例:
let strXml =
'< ?xml version="1.0" encoding="utf-8"? >' +
'< note importance="high" logged="true" >' +
' < title >Happy< /title >' +
' < todo >Work< /todo >' +
' < todo >Play< /todo >' +
'< /note >';let textEncoder = new util.TextEncoder();let arrbuffer = textEncoder.encodeInto(strXml);let that = new xml.XmlPullParser(arrbuffer.buffer);let arrTag = {};let str = "";let i = 0;function func(key, value){
arrTag[i] = 'key:'+key+' value:'+ value.getColumnNumber();
str += arrTag[i];
i++;
return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);console.log(str);// 输出:
// key:0 value:1key:2 value:77key:10 value:81key:2 value:88key:4 value:93key:3 value:101key:10 value:105key:2 value:111key:4 value:115key:3 value:122key:10 value:126key:2 value:132key:4 value:136key:3 value:143key:3 value:150key:1 value:299
getDepth
getDepth(): number
获取元素的当前深度。
系统能力:SystemCapability.Utils.Lang
返回值:
示例:
let strXml =
'< ?xml version="1.0" encoding="utf-8"? >' +
'< note importance="high" logged="true" >' +
' < title >Happy< /title >' +
' < todo >Work< /todo >' +
' < todo >Play< /todo >' +
'< /note >';let textEncoder = new util.TextEncoder();let arrbuffer = textEncoder.encodeInto(strXml);let that = new xml.XmlPullParser(arrbuffer.buffer);let arrTag = {};let str = "";let i = 0;function func(key, value){
arrTag[i] = 'key:'+key+' value:'+ value.getDepth();
str += arrTag[i];
i++;
return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);console.log(str);// 输出:
// key:0 value:0key:2 value:1key:10 value:1key:2 value:2key:4 value:2key:3 value:2key:10 value:1key:2 value:2key:4 value:2key:3 value:2key:10 value:1key:2 value:2key:4 value:2key:3 value:2key:3 value:1key:1 value:0
// 解析:
// key代表了当前事件类型,value为当前解析的深度。你可以根据EVENTTYPE来知道具体的解析事件。例如本示例结果key: value代表含义为:
// 0(START_DOCUMENT):0(起始深度为0), 2(START_TAG):1(解析到开始标签node, 对应深度为1), 10(WHITESPACE):1(解析到空白标签空格, 对应深度为1), 2(START_TAG):2(解析到开始标签title, 对应深度为2), ...
getLineNumber
getLineNumber(): number
获取当前行号,从1开始。
系统能力:SystemCapability.Utils.Lang
返回值:
示例:
let strXml =
'< ?xml version="1.0" encoding="utf-8"? >' +
'< note importance="high" logged="true" >' +
' < title >Happy< /title >' +
' < todo >Work< /todo >' +
' < todo >Play< /todo >' +
'< /note >';let textEncoder = new util.TextEncoder();let arrbuffer = textEncoder.encodeInto(strXml);let that = new xml.XmlPullParser(arrbuffer.buffer);let arrTag = {};let str = "";let i = 0;function func(key, value){
arrTag[i] = 'key:'+key+' value:'+ value.getLineNumber();
str += arrTag[i];
i++;
return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);console.log(str);// 输出:
// key:0 value:1key:2 value:1key:10 value:1key:2 value:1key:4 value:1key:3 value:1key:10 value:1key:2 value:1key:4 value:1key:3 value:1key:10 value:1key:2 value:1key:4 value:1key:3 value:1key:3 value:1key:1 value:1
getName
getName(): string
获取当前元素名称。
系统能力:SystemCapability.Utils.Lang
返回值:
示例:
let strXml =
'< ?xml version="1.0" encoding="utf-8"? >' +
'< note importance="high" logged="true" >' +
' < title >Happy< /title >' +
' < todo >Work< /todo >' +
' < todo >Play< /todo >' +
'< /note >';let textEncoder = new util.TextEncoder();let arrbuffer = textEncoder.encodeInto(strXml);let that = new xml.XmlPullParser(arrbuffer.buffer);let arrTag = {};let str = "";let i = 0;function func(key, value){
arrTag[i] = 'key:'+key+' value:'+ value.getName();
str += arrTag[i];
i++;
return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);console.log(str);// 输出:
// key:0 value:key:2 value:notekey:10 value:key:2 value:titlekey:4 value:key:3 value:titlekey:10 value:key:2 value:todokey:4 value:key:3 value:todokey:10 value:key:2 value:todokey:4 value:key:3 value:todokey:3 value:notekey:1 value:
getNamespace
getNamespace(): string
获取当前元素的命名空间。
系统能力:SystemCapability.Utils.Lang
返回值:
示例:
let strXml =
'< ?xml version="1.0" encoding="utf-8"? >' +
'< note importance="high" logged="true" >' +
' < title >Happy< /title >' +
' < todo >Work< /todo >' +
' < todo >Play< /todo >' +
'< /note >';let textEncoder = new util.TextEncoder();let arrbuffer = textEncoder.encodeInto(strXml);let that = new xml.XmlPullParser(arrbuffer.buffer);let arrTag = {};let str = "";let i = 0;function func(key, value){
arrTag[i] = 'key:'+key+' value:'+ value.getNamespace();
str += arrTag[i];
i++;
return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);console.log(str);// 输出:
// key:0 value:key:2 value:key:10 value:key:2 value:key:4 value:key:3 value:key:10 value:key:2 value:key:4 value:key:3 value:key:10 value:key:2 value:key:4 value:key:3 value:key:3 value:key:1 value:
getPrefix
getPrefix(): string
获取当前元素前缀。
系统能力:SystemCapability.Utils.Lang
返回值:
示例:
let strXml =
'< ?xml version="1.0" encoding="utf-8"? >' +
'< note importance="high" logged="true" >' +
' < title >Happy< /title >' +
' < todo >Work< /todo >' +
' < todo >Play< /todo >' +
'< /note >';let textEncoder = new util.TextEncoder();let arrbuffer = textEncoder.encodeInto(strXml);let that = new xml.XmlPullParser(arrbuffer.buffer);let arrTag = {};let str = "";let i = 0;function func(key, value){
arrTag[i] = 'key:'+key+' value:'+ value.getPrefix();
str += arrTag[i];
i++;
return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);console.log(str);// 输出:
// key:0 value:key:2 value:key:10 value:key:2 value:key:4 value:key:3 value:key:10 value:key:2 value:key:4 value:key:3 value:key:10 value:key:2 value:key:4 value:key:3 value:key:3 value:key:1 value:
getText
getText(): string
获取当前事件的文本内容。
系统能力:SystemCapability.Utils.Lang
返回值:
示例:
let strXml =
'< ?xml version="1.0" encoding="utf-8"? >' +
'< note importance="high" logged="true" >' +
' < title >Happy< /title >' +
' < todo >Work< /todo >' +
' < todo >Play< /todo >' +
'< /note >';let textEncoder = new util.TextEncoder();let arrbuffer = textEncoder.encodeInto(strXml);let that = new xml.XmlPullParser(arrbuffer.buffer);let arrTag = {};let str = "";let i = 0;function func(key, value){
arrTag[i] = 'key:'+key+' value:'+ value.getText();
str += arrTag[i];
i++;
return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);console.log(str);// 输出:
// key:0 value:key:2 value:key:10 value: key:2 value:key:4 value:Happykey:3 value:key:10 value: key:2 value:key:4 value:Workkey:3 value:key:10 value: key:2 value:key:4 value:Playkey:3 value:key:3 value:key:1 value:
isEmptyElementTag
isEmptyElementTag(): boolean
判断当前元素是否为空元素。
系统能力:SystemCapability.Utils.Lang
返回值:
示例:
let strXml =
'< ?xml version="1.0" encoding="utf-8"? >' +
'< note importance="high" logged="true" >' +
' < title >Happy< /title >' +
' < todo >Work< /todo >' +
' < todo >Play< /todo >' +
'< /note >';let textEncoder = new util.TextEncoder();let arrbuffer = textEncoder.encodeInto(strXml);let that = new xml.XmlPullParser(arrbuffer.buffer);let arrTag = {};let str = "";let i = 0;function func(key, value){
arrTag[i] = 'key:'+key+' value:'+ value.isEmptyElementTag();
str += arrTag[i];
i++;
return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);console.log(str);// 输出:
// key:0 value:falsekey:2 value:falsekey:10 value:falsekey:2 value:falsekey:4 value:falsekey:3 value:falsekey:10 value:falsekey:2 value:falsekey:4 value:falsekey:3 value:falsekey:10 value:falsekey:2 value:falsekey:4 value:falsekey:3 value:falsekey:3 value:falsekey:1 value:false
isWhitespace
isWhitespace(): boolean
判断当前文本事件是否仅包含空格字符。
系统能力:SystemCapability.Utils.Lang
返回值:
示例:
let strXml =
'< ?xml version="1.0" encoding="utf-8"? >' +
'< note importance="high" logged="true" >' +
' < title >Happy< /title >' +
' < todo >Work< /todo >' +
' < todo >Play< /todo >' +
'< /note >';let textEncoder = new util.TextEncoder();let arrbuffer = textEncoder.encodeInto(strXml);let that = new xml.XmlPullParser(arrbuffer.buffer);let arrTag = {};let str = "";let i = 0;function func(key, value){
arrTag[i] = 'key:'+key+' value:'+ value.isWhitespace();
str += arrTag[i];
i++;
return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);console.log(str);// 输出:
// key:0 value:truekey:2 value:falsekey:10 value:truekey:2 value:truekey:4 value:falsekey:3 value:truekey:10 value:truekey:2 value:truekey:4 value:falsekey:3 value:truekey:10 value:truekey:2 value:truekey:4 value:falsekey:3 value:truekey:3 value:truekey:1 value:true
getAttributeCount
getAttributeCount(): number
获取当前开始标记的属性数。
系统能力:SystemCapability.Utils.Lang
返回值:
示例:
let strXml =
'< ?xml version="1.0" encoding="utf-8"? >' +
'< note importance="high" logged="true" >' +
' < title >Happy< /title >' +
' < todo >Work< /todo >' +
' < todo >Play< /todo >' +
'< /note >';let textEncoder = new util.TextEncoder();let arrbuffer = textEncoder.encodeInto(strXml);let that = new xml.XmlPullParser(arrbuffer.buffer);let arrTag = {};let str = "";let i = 0;function func(key, value){
arrTag[i] = 'key:'+key+' value:'+ value.getAttributeCount();
str += arrTag[i];
i++;
return true; // Determines whether to continually parse, which is used to continue or terminate parsing.
}
let options = {supportDoctype:true, ignoreNameSpace:true, tokenValueCallbackFunction:func}
that.parse(options);console.log(str);// 输出:
// key:0 value:0key:2 value:2key:10 value:0key:2 value:0key:4 value:0key:3 value:0key:10 value:0key:2 value:0key:4 value:0key:3 value:0key:10 value:0key:2 value:0key:4 value:0key:3 value:0key:3 value:0key:1 value:0
EventType
事件枚举。
系统能力:以下各项对应的系统能力均为SystemCapability.Utils.Lang
名称 |
值 |
说明 |
---|---|---|
START_DOCUMENT |
0 |
启动文件事件。 |
END_DOCUMENT |
1 |
结束文件事件。 |
START_TAG |
2 |
启动标签事件。 |
END_TAG |
3 |
结束标签事件。 |
TEXT |
4 |
文本事件。 |
CDSECT |
5 |
CDATA事件。 |
COMMENT |
6 |
XML注释事件。 |
DOCDECL |
7 |
XML文档类型声明事件。 |
INSTRUCTION |
8 |
XML处理指令声明事件。 |
ENTITY_REFERENCE |
9 |
实体引用事件。 |
WHITESPACE |
10 |
空白事件。 |
审核编辑 黄宇
- 接口
- XML
- API
- 鸿蒙
- OpenHarmony
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