Node.js puppeteer - 从复杂的 txt 文件中获取内容 [英] Node.js puppeteer - Fetching content from a complex txt file
问题描述
如何在 puppeteer 中下载、访问和处理复杂的 txt 文件?
How can I download, access and process a complex txt file in puppeteer?
我可以访问一个 xml 文件(Node.js puppeteer - 下载/访问 xml 文件并处理内容) 像这样:
I can access a xml file (Node.js puppeteer - Downloading/Accessing a xml file and process the content) like this:
await page.goto(myPage, {waitUntil: 'load'});
const newPage = await page.evaluate(() => {
var columns = document.getElementsByTagName("VALUEA");
var values = {"values":[]};
for(let f in columns){
values.values.push(columns[f].innerText);
}
return JSON.stringify(values);
});
console.log(JSON.parse(newPage))
它返回我想要的值.但是如果我想访问一个看起来像这样的txt文件......并且为了测试想要获取所有'VALUEA'我得到:
Which returns me the desired values. But if I want to access a txt file looking like this ... and for testing want to fetch all 'VALUEA' I get:
{"values":[null,null,null]}
这是我正在查看的 TXT 文件:
That's the TXT file I'm looking at:
<XYZ-DOCUMENT>117.txt : 20180824
<XYZ-HEADER>117.hdr.sgml : 20180824
<VALUE00>20180824153107
VALUE01: 117
VALUE02: ABC
COMPANY:
COMPANY DATA:
VALUE03: Some Company
VALUE04: 777
BUSINESS ADDRESS:
VALUE05: Some street
VALUE06: Some city
</XYZ-HEADER>
<DOCUMENT>
<VALUE07>ABC
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?>
<Submission xmlns="http://www.xyz.it/abc/" xmlns:com="http://www.xyz.it/abc/common">
<headerData>
<VALUE08>ABC</VALUE08>
<xxxInfo>
<xxx>
<credentials>
<VALUE09>777</VALUE09>
<VALUE10>XXXXXXXX</VALUE10>
</credentials>
</xxx>
<VALUE11>06-30-2018</VALUE11>
</xxxInfo>
</headerData>
<bodyData>
<coverPage>
<VALUE12>06-30-2018</VALUE12>
<VALUE13>1</VALUE13>
<amendmentInfo>
<VALUE14>STRAWBERRIES</VALUE14>
</amendmentInfo>
<xxxManager>
<VALUE15>Corp</VALUE15>
<address>
<VALUE16:street1>MOUNTAIN STREET</VALUE16:street1>
<VALUE17:city>NEW YORK</VALUE17:city>
</address>
</xxxManager>
<provideInfoForInstruction5>N</provideInfoForInstruction5>
</coverPage>
</bodyData>
</Submission>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>INFORMATION TABLE
<SEQUENCE>2
<FILENAME>xml_xyz.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?>
<informationTable xmlns="http://www.xyz.it/abc/informationtable" xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance">
<infoTable>
<VALUEA>Company A</VALUEA>
<VALUEB>INC</VALUEB>
<shParent>
<VALUEC>123</VALUEC>
<VALUED>AB</VALUED>
</shParent>
</infoTable>
<infoTable>
<VALUEA>Company B</VALUEA>
<VALUEB>LTD</VALUEB>
<shParent>
<VALUEC>567</VALUEC>
<VALUED>ST</VALUED>
</shParent>
</infoTable>
...
</informationTable>
</XML>
</TEXT>
</DOCUMENT>
</XYZ-DOCUMENT>
最后我想获得所有 VALUE(主要是 VALUEA、VALUEB、VALUEC、VALUEC)!怎么办?
At the end I want to get all VALUE (primarly the VALUEA, VALUEB, VALUEC, VALUEC)! How to do so?
推荐答案
您可以使用以下解决方案从 VALUEA
, VALUEB
, 获取文本内容VALUEC
和 VALUED
:
You can use the following solution to get the text content from VALUEA
, VALUEB
, VALUEC
, and VALUED
:
const example = await page.evaluate( () =>
{
const page = document.createElement( 'html' );
const page_content = document.body.textContent;
page.innerHTML = page_content;
return {
'VALUEA' : Array.from( page.getElementsByTagName( 'VALUEA' ), e => e.textContent ),
'VALUEB' : Array.from( page.getElementsByTagName( 'VALUEB' ), e => e.textContent ),
'VALUEC' : Array.from( page.getElementsByTagName( 'VALUEC' ), e => e.textContent ),
'VALUED' : Array.from( page.getElementsByTagName( 'VALUED' ), e => e.textContent )
};
});
console.log( example.VALUEA[0] ); // Company A
console.log( example.VALUEA[1] ); // Company B
console.log( example.VALUEB[0] ); // INC
console.log( example.VALUEB[1] ); // LTD
console.log( example.VALUEC[0] ); // 123
console.log( example.VALUEC[1] ); // 567
console.log( example.VALUED[0] ); // AB
console.log( example.VALUED[1] ); // ST
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