when I try to download a table with grouping by fields, it does not appear correctly in the pdf, can anyone help me?
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Are you referring to the null values appearing in the output. If so then you can use an accessor on the column definitions to convert the null value into an empty string so it renders correctly.
To start with we define an accessor function outside of Tabulator:
var nullFixingAccessor = function(value){
return value === null ? "" : value; //return value or empty string if it is null
}
Then in each column definition for a column that might contain a null we set it on the accessorDownload property:
{title:"Act", field:"act", accessorDownload:nullFixingAccessor},
This will then convert the null values to an empty string when the pdf is downloaded
Related
I want to set a specific value in a table to default format "General".
To implement this I follow the spec:
Blank and null values in Excel add-ins
When you specify a blank value for a property (i.e., two quotation
marks with no space in-between ''), it will be interpreted as an
instruction to clear or reset the property. For example:
...
If you specify a blank value for the
numberFormat property, the number format is reset to General.
...
My code is:
const formats = [["0", "0"], ["", "0.00"], ["0.00", "0.00"]];
const range = sheet.getRange("D3:E5");
range.numberFormat = formats;
The usage of empty quote lead to an error message from the excel.js API :
message: "The argument is invalid or missing or has an incorrect format."
To query empty fields I have seen this answer:
Postgresql, select empty fields
(unfortunately I don't have enough reputation points to answer #wildplasser on that post, so here we go)
Wildplasser's answer:
SELECT mystr, mystr1
FROM mytable
WHERE COALESCE(mystr, '') = ''
OR COALESCE(mystr1, '') = ''
;
I am not sure I get the COALESCE method, but it also works for me this way (specific for my string data type):
SELECT mystr, mystr1
FROM mytable
WHERE mystr = '' ;
My questions are:
Does COALESCE work for any data type?
Is there any better way to query empty strings? i.e., column_value = ' '
First you need to understand the difference between NULL and "empty".
NULL is the absence of a value. Any (or at least almost any) data type can be NULL. When you have a column of type integer, and you don't want to put a value in that field, you put NULL.
"Empty" is a string/text concept. It's a string with an empty value, i.e. ''. A text field with an empty string contains a value: the empty string. It is not the same as containing NULL, i.e. no value. Other data types e.g. integer, boolean, json, whatever, can't have an empty string.
Now to COALESCE. That function works on any data type, and basically it returns the first not-NULL result of its arguments. So COALESCE(NULL, TRUE) returns TRUE because the first argument is NULL; COALESCE(FALSE, TRUE) returns FALSE because the first argument is not NULL; and COALESCE(NULL, NULL) returns NULL because there are no not-NULL arguments.
So, COALESCE(field, '') returns the value of field if it's not NULL, and otherwise returns an empty string. When used in COALESCE(field, '') = '' when trying to find any rows where field is "empty", this is basically saying "if field is NULL then use an empty string in its place, then see if it equals an empty string". This is because NULL and an empty string are not equivalent, and "you" are trying to find any rows where fields are NULL or empty.
In your version of the query, where you just do field = '', that will ONLY return results where field is actually an empty string, not where field is NULL. Which behaviour you desire is up to you.
With COALESCE you will get NULL values too in the first query.
1- In Postgresql, you can't mix datatype example here, but you can use the function to_char to mix values
2- I don't understand your question
I think based on the definition of coalesce itself as
"The COALESCE() function returns the first non-null value in a list."
means that it work for any data type
I don't really understand the question but i think yes its already the most efficient way to make empty string
Set timeVc=timeVw.Allentries
Set tobeDeleted=timeVw.Getalldocumentsbykey("", true)
Call tobeDeleted.removeall(True)
Just now want to confirm what is the meaning of getalldocumentbykey with empty string
GetAllDocumentsByKey with an empty string as first parameter returns an empty collection.
If you want to get all documents with an empty value in view's first sorted column then change the formula of your first sorted column to
#If(YourFieldName = ""; " "; YourFieldName)
It has a space instead of an empty string now.
Set tobeDeleted=timeVw.Getalldocumentsbykey(" ", true)
returns all those documents then.
There is floating point number field whose name is "new_poscost". The existing value of the field is 0,00 or it can be any decimal value. I want to sum a value with it. But I'm getting a cast error.
In first line of code poscost variable is getting the value of attribute. When it comes to assign sum of values to another entity's attribute, I'm getting "cast is not valid" error.
decimal poscost = postEntity.Attributes.Contains("new_poscost") ?
(decimal)postEntity["new_poscost"] : 0m; // value is assigning to poscost properly.
FlightHotel.Entities[0].Attributes["new_poscost"] = poscost+
(decimal)FlightHotel.Entities[0]["new_poscost"];
Try to use following approach:
double podnost = postEntity.Contains("new_poscost") ? new_poscost.GetAttributeValue<double>("new_poscost") : 0;
If you set up a simple test form with a TextBox bound to a string property of a class and delete the content the value passed back to the property setter is "".
If you do the same thing with a cell in a DataGridView the value passed back to the property setter is Nothing.
Why the difference and is there anything we can apply to the DataGridView to make it behave the same as a TextBox?
if am correct the DataGridViewTextBoxCell by default is Null and the TextBox by Default is String.Empty
you might check the Null vs Empty
Nothing is VB's version of C#'s null or a database's NULL. It means that there is no value, as opposed to "" which means that there is a value, of an empty string.
I'm not entirely sure, but I suspect the difference is because a textbox's Text property is always a string, but a cell's Value property can be any object. You can use the null-coalescing operator to return an empty string when the value is Nothing.
Set(ByVal value As String)
_Surname = If(value, "")
End Set
Alternatively, you can validate the cell post-edit and set it to ""explicitly. see here for an example - instead of messaging the user, you'd just change the value.
DataGridView converts "" into Null during cell parsing.
If you handle CellParsing event and just set ParsingApplied, then no further parsing will be performed and the resulting value will remain "".