qgisqgis-3
I used QGIS 2.18 and now I use QGIS 3.0 under Windows 10 in Spanish versions.
In the field editor in version 2.18 each field had his button "Text edition" but in version 3.0 that button doesn't appear. In the next images you can see what I mean, the first is from version 2.18 and the second is from version 3.0.
Can someone help me? Have they moved that option to another window?
I am also interested in this solution, if any available.
Below is a way to use Text diagram which may or may not gives you what you are looking for. It is a multiple-colored texts, but does not offer much flexibility.
Anyway, just for your thoughts.
Fun fact: NULL is not None
With this in mind it's easy to fix the code
@qgsfunction(args=-1, group='Custom')
def mean_col(cols, feature, parent):
vals = [feature[i] for i in cols if feature[i] != NULL]
return sum(vals)/float(len(vals))
Additional advice: never write to layers in expressions. Expressions are often executed in threads and in different contexts and using layer.changeAttributeValue() and similar functions may result in undefined behavior (read: crash).
Another interesting experiment for educational purpose.
Instead of providing column names to the function, you can also provide values.
@qgsfunction(args='auto', group='Custom')
def mean_value(vals, feature, parent):
vals = [val for val in vals if val != NULL]
return sum(vals)/float(len(vals))
And then call it with
mean_value("kk1", "kk2", "kk3", "kk4")
The interesting result is: it will return NULL as soon as at least one column is NULL.
How comes? QGIS assumes the result for an expression function is NULL as soon as at least one parameter is NULL for performance reasons. It's possible to control this behavior, but unfortunately the @qgsfunction decorator does not support this to date (QGIS 3.2).
To workaround this behavior we can either provide a full-blown QgsExpressionFunction implementation which is out of scope for this answer.
Or just take a little detour and use an array instead.
@qgsfunction(args='auto', group='Custom')
def mean_value(vals, feature, parent):
vals = [val for val in vals if val != NULL]
return sum(vals)/float(len(vals))
and then call it with
mean_value(array("kk1", "kk2", "kk3", "kk4"))
Best Answer
Settings about 'Edit Widget' in QGIS 2.x was moved to 'Attributes Form' tab in QGIS 3.x.
To perform widget settings of a field, you get 'Attributes Form' tab, select a field, select a widget type and edit settings.