使用Excel VBA从网站上抓取文字 [英] Scrape text from a website using Excel VBA

问题描述

我发现了这个

I found this article explaining how to scrape certain tags from a website using Excel VBA.

下面的代码从找到的第一个<p>标记获取内容:

The code below gets the content from the first <p> tag that it finds:

Sub get_title_header()
Dim wb As Object
Dim doc As Object
Dim sURL As String
Dim lastrow As Long
lastrow = Sheet1.Cells(Rows.Count, "A").End(xlUp).Row

For i = 2 To lastrow
    Set wb = CreateObject("internetExplorer.Application")
    sURL = Cells(i, 1)

    wb.navigate sURL
    wb.Visible = True

    While wb.Busy
        DoEvents
    Wend

    'HTML document
    Set doc = wb.document

    Cells(i, 2) = doc.title

    On Error GoTo err_clear
    Cells(i, 3) = doc.GetElementsByTagName("p")(0).innerText
    err_clear:
    If Err <> 0 Then
        Err.Clear
        Resume Next
    End If
    wb.Quit
    Range(Cells(i, 1), Cells(i, 3)).Columns.AutoFit
Next i

End Sub

我想让抓取工具获取网页上<p>标记内的所有内容.因此，我猜想缺少某种foreach功能.

I'd like to make the scraper get all the content that is within a <p> tag on a webpage. So I guess a foreach functionality of some kind is missing.

如何从多个<p>标签中收集内容?

How can the content from multiple <p> tags be collected?

更新 工作代码！

Sub get_title_header()
Dim wb As Object
Dim doc As Object
Dim sURL As String
Dim lastrow As Long
Dim i As Integer
lastrow = Sheet1.Cells(Rows.Count, "A").End(xlUp).Row

For i = 2 To lastrow
    Set wb = CreateObject("internetExplorer.Application")
    sURL = Cells(i, 1)

    wb.navigate sURL
    wb.Visible = True

    While wb.Busy
        DoEvents
    Wend

    'HTML document
    Set doc = wb.document

    Cells(i, 2) = doc.Title

    On Error GoTo err_clear

    Dim el As Object
    For Each el In doc.GetElementsByTagName("p")

        counter = counter + 1
        Cells(i, counter + 2).Value = Cells(counter + 1).Value & el.innerText

    Next el
    counter = 0

    err_clear:
    If Err <> 0 Then
        Err.Clear
        Resume Next
    End If
    wb.Quit
    Range(Cells(i, 1), Cells(i, 10)).Columns.AutoFit
Next i

End Sub

推荐答案

您快到了！ doc.GetElementsByTagName("p")返回HTMLParagraphElement对象的集合，您使用doc.GetElementsByTagName("p")(0)访问了它们的第一个条目.正如您所暗示的那样，For Each循环可让您依次访问每个循环:

You're almost there! doc.GetElementsByTagName("p") returns a collection of HTMLParagraphElement objects of which you accessed the first entry using doc.GetElementsByTagName("p")(0). As you allude to, a For Each loop would let you access each in turn:

Sub get_title_header()
Dim wb As Object
Dim doc As Object
Dim sURL As String
Dim lastrow As Long
Dim i As Integer
lastrow = Sheet1.Cells(Rows.Count, "A").End(xlUp).Row

For i = 2 To lastrow
Set wb = CreateObject("internetExplorer.Application")
sURL = Cells(i, 1)

wb.navigate sURL
wb.Visible = True

While wb.Busy
    DoEvents
Wend

'HTML document
Set doc = wb.document

Cells(i, 2) = doc.Title

On Error GoTo err_clear

Dim el As Object
For Each el In doc.GetElementsByTagName("p")
    Cells(i, 3).Value = Cells(i, 3).Value & ", " & el.innerText
Next el

err_clear:
If Err <> 0 Then
Err.Clear
Resume Next
End If
wb.Quit
Range(Cells(i, 1), Cells(i, 3)).Columns.AutoFit
Next i

End Sub

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