Mike MacDonagh's Blog

Somewhere in the overlap between software development, process improvement and psychology

Manipulating web content in Excel, or, My Excel can haz ajax?

Yes. Well, kinda. Not really. Er… maybe. Hey look, it works!

There’s not much better than Microsoft Excel for mucking about with big grids of stuff really easily. I’ve often used Excel to “screen scrape” or at least “DOM scrape” web content for various reasons. One of the most common is to get stuff from a web app that doesn’t provide a “download to csv” option or a decent API. Another reason is to grab stuff from an RSS feed to mix in to whatever my spreadsheet is doing, or just to use it as a REST client. So I offer you the following generic solution, I’ll base this one around the RSS example…

Wikipedia, the absolute source of all knowledge and truth, says that for something to be AJAX “the use of JavaScript and XML is not actually required, nor do the requests need to be asynchronous”. Despite this  “AJAX” is generally considered to be an initialism and acronym for “Asynchronous JavaScript and XML”. Taking both of these into consideration I must conclude that AJAX means whatever we want it to mean. For me it’s when I’m using an XMLHttpRequest object in one way or another to yank some xml/html/whatever from a web server.

In Excel I’m not using javascript asynchronously but I am using xml and even a XMLHttpRequest object via com interop so for me that qualifies as doing ajax in Excel.

How to do it:

1. Avoid late binding of com objects and help yourself out by adding a reference (code editor: Tools -> References…) from the Excel app to a library that will provide a XMLHttpRequest object. Happily, “Microsoft XML, v6.0” provides such a beastie for us.

2. Write some Ajaxy code to use the object like this:

Private Sub MMD_DoSomeAjaxyStuff()

'declare some useful vars
Dim req As XMLHTTP
Dim doc As DOMDocument
Dim url As String

'Some things to process the XML
Dim entries As IXMLDOMNodeList
Dim entry As IXMLDOmNode

'The RSS to get, naturally
uri = "https://mikemacd.wordpress.com/feed/"

'make a new XMLHttpRequest object
Set req = new XMLHTTP

'Load the xml
req.Open "GET", uri, , "", ""
While req.ReadyState <> 4
  DoEvents 'yeah I know...

'Read the XML
Set doc = New DOMDocument
doc.loadXML req.responseText

'Do something with the RSS
Set entries = doc.getElementsByTagName("item")
For i = 0 To entries.Length - 1
    'Do something with the RSS like stick it in a cell
    Set entry = entries.Item(i)
    Cells(i + 1, 1).Value = entry.childNodes(1).Text
Next i

End Sub

3. w00t 😀


One response to “Manipulating web content in Excel, or, My Excel can haz ajax?

  1. Ama December 22, 2012 at 3:29 pm

    Really informative article post.Thanks Again. i Like This Article

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