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Forum to discuss writing script in Architect plugins for SalesLogix & general SalesLogix customization topics (for Windows client only). View the code of conduct for posting guidelines.
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Check URL Exists
Posted: 18 Aug 09 8:41 AM
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Me again, like a bad penny.
I've created a new form within which users can view product details. In most cases there is an accompanying image for the product stored on our web site.
As such, I've created a button that when clicked opens a web browser and displays the image.
Here's the kicker. I would like to disable the button if the image does not exist, is there any way of checking the URL when the form opens, and disabling the button if the image is not there? I was hoping it would be something simple, like using a hidden TBrowser control, but there are not enough properties open to me in this control to see if a URL has been successful or not. Even reading the HTML value after a successful or unsuccessful URL has loaded to this control only gives me "HTML/HTML".
Anyone feeling creative? |
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Re: Check URL Exists
Posted: 18 Aug 09 8:47 AM
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Where are the Images stored? Can you just check on the server side if the Image exists?
Otherwise you may be able to make a call using the xMLHTTP object and then test the Response status (HTML code). If you get a 200, great, otherwise fail.
But... Couldn't you as well try something like "prefetching" the Image and if it exists, enable the button, if it doesn't disable it. And, since you have prefetched it, don't need to open a new browser, could use a Dialog to display it (all with Javascript). |
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Re: Check URL Exists
Posted: 18 Aug 09 9:42 AM
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Thanks for the advice (do you get any work done other than supporting me?  )
Unfortunately the actual server itself is hidden to the majority of the Saleslogix users and the Saleslogix Server, the only way in I have is through the URL.
Your xMLHTTP object idea sounds like it could have legs, I'll look up the object properties on Google and try to figure out how to use it.
Prefetching the image would be ideal if a) I could locally store a web page on every users machine that I could pass parameters to which would then run some java and return a value, or b) I had direct access to the website. I've asked the web guys here to create such a page that would return some values that I could read, but they're up to their eyeballs at the mo and refuse to help.
If anyone has a link to some documentation on xMLHTTP I'd be grateful, otherwise I'll see what I can find myself. |
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Re: Check URL Exists
Posted: 18 Aug 09 10:49 AM
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Thanks for the advice, I've managed to cobble something together. For anyone else wanting to do this...
1) Copy this function and either place it in your form script or in a library that it references (preferable, as you can use it again elsewhere)
Function Web_ValidateURL(strURL)
Dim objHTTP
Set objHTTP = CreateObject("Microsoft.XmlHttp")
objHTTP.open "HEAD", strURL, FALSE
objHTTP.send ""
if objHTTP.Status = "200" then
Web_ValidateURL = True
else
Web_ValidateURL = False
end if
set objHTTP = nothing
End Function
2) In the script for your form, or wherever you want to check a URL...
if Web_ValidateURL("http://www.yourwebaddress/yourjpgfolder/xyz.jpg") = True then
btnImages.Enabled = True
btnImages.Caption = "Images"
else
btnImages.Enabled = False
btnImages.Caption = "No Image"
end if
... you will obviously need to change the code to suit your circumstances but hopefully the above is simple enough to understand.
Nice to give something back for a change 
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