On 27 Oct 2016 6:51 AM, "Bernd Vogelgesang" <bernd.vogelges...@gmx.de>
wrote:
>
> Arghh, sorry for the noise!
>
> When hovering over the data-driven input button not so hectically, I
discovered the explanation that it expects a 0 or 1.
> So
> case when
> 'mypath'|| @atlas_pagename ||'_1.jpeg' IS NULL
> THEN
> 0
> END
>
> did the trick!

This is odd... A null picture expression should be rendered empty, not as
the red cross. The red cross is intended only as an obnoxious, obvious
indicator that a picture path was set but couldn't be found.

The expression above would only result in 0 if @atlas_pagename is null.

Nyall

>
> Just amazing!!!
>
> Thanx
> Bernd
>
> Am 26.10.2016, 22:19 Uhr, schrieb DelazJ <del...@gmail.com>:
>
>> Hi,
>> what about using the data-defined option near the "Exclude items from
export" in the items properties --> Rendering (with a case when expression)?
>>
http://docs.qgis.org/2.14/en/docs/user_manual/print_composer/composer_items/composer_items_options.html#rendering-mode
>>
>> HTH,
>> Harrissou
>>
>> 2016-10-26 22:10 GMT+02:00 Bernd Vogelgesang <bernd.vogelges...@gmx.de>:
>>>
>>> Hi,
>>> I set up a neat atlas for displaying a row of 50 sample plots. On a
second page, I want to show 2 pictures taken of these plots automatically
with an expression including the path || @atlas_pagenumber || '_1.jpeg' or
'_2.jpeg' to display up to two photos named e.g. 1_1.jpeg, 1_2.jpeg.
>>>
>>> This works really great! The problem is, that for some plots, we do not
and have any picture or only one. In composer, these missing images are
marked with a big red cross.
>>> Unfortunately, these red crosses are also exported, which looks quite
shitty.
>>>
>>> Is there any clever way of forcing QGIS not to export these place
holders but just not to print anything at this place?
>>>
>>> The only (boring) idea I came up with till now, was to create empty
white images and name them accordingly to avoid the red crosses.
>>>
>>> Thanx
>>> Bernd
>>>
>>> --
>>> Bernd Vogelgesang
>>> Siedlerstra├če 2
>>> 91083 Baiersdorf/Igelsdorf
>>> Tel: 09133-825374
>>> _______________________________________________
>>> Qgis-user mailing list
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>>
>>
>
>
>
> --
> Bernd Vogelgesang
> Siedlerstra├če 2
> 91083 Baiersdorf/Igelsdorf
> Tel: 09133-825374
>
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