Windows 7上的Excel 2013 XPath
/ Javascript
/ jQuery
超出了范围。
我正在尝试迭代页面中的select div
元素,即具有特定data-level
属性的元素。
我当前的方法是similar to this,但我无法找到基于属性选择元素的非手动方式。我最接近的是:
With CreateObject("WINHTTP.WinHTTPRequest.5.1")
.Open "GET", url, False
.Send
pHTML.body.innerHTML = .ResponseText
End With
Set eCollection = pHTML.getElementsByClassName("chapter").getElementsByTagName("div")
For i = 0 To eCollection.Length
If eCollection(i).getAttribute("data-level") >= 0 Then ' Throw cake
Next i
这个解决方案,虽然我确信它是可行的(如果不优雅),如果只是因为当我开始寻找中的特定元素和元素序列时,循环最终会变得多么大似乎是次优的这些元素。
所以我正在寻找一种方法来做这样的事情:
For Each pElement In pHTML.getElementsByClassName("chapter").getElementsByTagName("div").getElementsByAttribute("data-level")
' Throw cake at the element
Next
我知道没有方法getElementsByAttribute
,因此问题
这里有一些我无视的方法,还是我被锁定到手动迭代?
或者,如果我交换当前的方法来创建IE实例,álathis answer,我是否可以使用querySelectorAll
来最终得到类似于我上面概述的结果的东西?
答案 0 :(得分:4)
对于任何其他人来说,外壳,可以说,看起来像这样:
Sub ScrapeWithHTMLObj(url As String, domClassName As String, domTag As String, domAttribute As String, domAttributeValue As String)
' Dependencies:
' * Microsoft HTML Object Library
' Declare vars
Dim pHTML As HTMLDocument
Dim pElements As Object, pElement As Object
Set pHTML = New HTMLDocument
' Basic URL healthcheck
Do While (url = "" Or (Left(url, 7) <> "http://" And Left(url, 8) <> "https://"))
MsgBox ("Invalid URL!")
url = InputBox("Enter new URL: (0 to terminate)")
If url = "0" Then Exit Sub
Loop
' Fetch page at URL
With CreateObject("WINHTTP.WinHTTPRequest.5.1")
.Open "GET", url, False
.Send
pHTML.body.innerHTML = .ResponseText
End With
' Declare page elements
Set pElements = pHTML.getElementsByClassName(domClassName)
Set pElement = pElements(0).getElementsByTagName(domTag)
' Extract only elements with wanted attribute
pEleArray = getElementsByAttribute(pElement, domAttribute, domAttributeValue)
For Each e In pEleArray
' Do stuff to elements
Debug.Print e.getAttribute(domAttribute)
Next
End Sub
如果你走这条路,你还需要这样的东西:
Function getElementsByAttribute(pObj As Object, domAttribute As String, domAttributeValue As String) As Object()
Dim oTemp() As Object
ReDim oTemp(1 To 1)
For i = 0 To pObj.Length - 1
'Debug.Print pObj(i).getAttribute(domAttribute)
If pObj(i).getAttribute(domAttribute) = domAttributeValue Then
Set oTemp(UBound(oTemp)) = pObj(i)
ReDim Preserve oTemp(1 To UBound(oTemp) + 1)
End If
Next i
ReDim Preserve oTemp(1 To UBound(oTemp) - 1)
getElementsByAttribute = oTemp
End Function
根据HTML树的不同,您显然需要更改子网中归零的元素。对于我在测试中使用的网站,这种结构完美无缺。
用法示例:
Call ScrapeWithHTMLObj("https://somesite", "chapter-index", "div", "data-level", "1")
它将进入名为chapter-index
的第一个类,选择包含div
标记的所有元素,最后提取包含值为data-level
的属性1
的所有元素。< / p>