How to check if element is not exist in VBA

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Hi All.

I am trying to scrapping data from website.

In some case if the data have been delete the website is change.

So I Use

appIE.document.getElementsByClassName("alert-block")

But I don't know how to identify if the class

("alert-block")

exits or not.

I have read the artical here

[^][^]

And they say that the

If MyObject Is Nothing Then  ' <--- This check always returns False

What I have tried:

If appIE.document.getElementsByClassName("alert-block") Is Nothing Then

'Do something1.
else
'do something2 here.
endif

Posted 16-Apr-18 23:31pm

hmanhha

Updated 16-Apr-18 23:54pm

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Jochen Arndt · Answer 1 · 2018-04-16T23:55:00

Solution 1

getElementsByClassName returns a collection. If no element can be found a collection with no items is returned. But it is still a collection object so that checking for Nothing will always fail. Instead check if the collection is empty or not by using the Count property:

VB

Set element = appIE.document.getElementsByClassName("alert-block")
If element.Count > 0
' Element exists and is not empty
Endif

Posted 16-Apr-18 23:55pm

Jochen Arndt

Comments

hmanhha 17-Apr-18 21:32pm

If user have do something then the data have been delete the IE will have the class "alert-block" and if user did not delete IE will not have this class.

So cannot use getElementByClassName("alert-block")

Jochen Arndt 18-Apr-18 3:03am

I did not get what you want to tell me here.
My code tells you if the element exists (or not in the Else case). So where is the problem?

hmanhha 18-Apr-18 16:25pm

I mean here is that. Normally web site have element with classname ("alert-block")
but obnomal it dont have and your code will have error. and how can I detect this obnomal situation when getelementbyClassName and getElementbyID.

Jochen Arndt 18-Apr-18 17:40pm

What error?