[Interest] Extract only src attribute of an image tag into XmlRole with XPath functions

[Gian Maxera]

Thank you for the suggestions.
I resolved passing the full description to a C++ slot on which I used the full power of QRegExp to retrieve what I want.

Thanks,
Gianluca.


> On 3 Jun 2015, at 12:11, Federico Buti <bacarozzo at gmail.com> wrote:
> 
> Oh. I thought it was an issue related to my mail. :)
> 
> I don't know If it is possible to apply some kind of transformations over the XML or if there is a specific way to handle this case. Depending on the way you are you receive the full XML, you can try to call a JS function to polish it via the replace() <http://www.w3schools.com/jsref/jsref_replace.asp> function and then set the polished XML to the "xml" property. That's not certainly the most efficient approach but it could work.
> Just my two cents.
> 
> Cheers,
> 
> ---
> Federico Buti
> 
> On 3 June 2015 at 12:57, Gian Maxera <gmaxera at gmail.com <mailto:gmaxera at gmail.com>> wrote:
> Hello Federico,
> the problem is that the img tag inside the description has been escaped :-(
> So, I cannot access it using a query path :-(
> If you look at the content of description so can see that instead of having:
> <description><img src”…”> … </description>
> I have the image escaped:
> <description><img src=“ … </description>
> 
> So, I think I need something like that:
> 
> XmlRole { name: “img”; query: “fn:somefunction( description/string(), ‘some regexp for extract’)” }
> 
> But no idea what to use, not event if it’s feasible.
> 
> Thanks,
> Gianluca.
> 
> 
>> On 3 Jun 2015, at 11:46, Federico Buti <bacarozzo at gmail.com <mailto:bacarozzo at gmail.com>> wrote:
>> 
>> ​Hi Gianluca,
>> 
>> depending on the full XML you can query for the description tag and than query for the first img tag with "[1]", something like this:
>> 
>> 
>>          XmlListModel {
>>             id: model
>> 
>>             query: "(/path/to/description/img)[1]"
>>             XmlRole { name: "img"; query: "@src/string()" }
>>         }   
>> ​
>> 
>> Here I defined a role for the "src" attribute as a string.
>> Hope that helps.
>> 
>> Cheers,
>> 
>> 
>> ---
>> Federico Buti
>> 
>> On 3 June 2015 at 11:26, Gian Maxera <gmaxera at gmail.com <mailto:gmaxera at gmail.com>> wrote:
>> Hello,
>> I have an rss feed coming from Tumblr blog page.
>> The xml of the feed has into description a lot of html content that I want to remove and keep only the first image I found.
>> For example, this is one of the content into description tag:
>> 
>> <description><img src="http://33.media.tumblr.com/bd4312958b742a21221e87c0a96d52c1/tumblr_np213siZRu1tbs1mwo1_500.gif <http://33.media.tumblr.com/bd4312958b742a21221e87c0a96d52c1/tumblr_np213siZRu1tbs1mwo1_500.gif>"/><br/> <br/><img src="http://33.media.tumblr.com/6f1ca4ab1ef3d2504b2da48f2616df6e/tumblr_np213siZRu1tbs1mwo2_400.gif <http://33.media.tumblr.com/6f1ca4ab1ef3d2504b2da48f2616df6e/tumblr_np213siZRu1tbs1mwo2_400.gif>"/><br/> Paris Marriott Champs Elysees<br/><br/> <img src="http://36.media.tumblr.com/0f4726dd2f19c8d4a042f72786987573/tumblr_np213siZRu1tbs1mwo3_500.jpg <http://36.media.tumblr.com/0f4726dd2f19c8d4a042f72786987573/tumblr_np213siZRu1tbs1mwo3_500.jpg>"/><br/> <br/><h2><b>Marriott Hotels in France Celebrate Earth Hour 2015</b></h2><p>See what happened during Earth Hour celebrations at Marriott hotels in France.</p></description>
>> 
>> What I would like is to have a XPath function that return me only the first image url:
>> http://33.media.tumblr.com/bd4312958b742a21221e87c0a96d52c1/tumblr_np213siZRu1tbs1mwo1_500.gif <http://33.media.tumblr.com/bd4312958b742a21221e87c0a96d52c1/tumblr_np213siZRu1tbs1mwo1_500.gif>
>> 
>> How can I do that ?
>> 
>> Thanks,
>> Gianluca.
>> 
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