You'll either need a math library, or upgrade to 5.1.20.
But here's a way for strings that are 50 characters or less:
\define length2(str,len)
<$vars reg="^.{$len$}$">
<$set name="result" filter="[title[$str$]regexp<reg>]" value="""$len$"""
emptyValue="" >
<<result>>
</$set>
</$vars>
\end
\define length(str)
<$list filter="[range[1,50]]" variable="cnt">
<$macrocall $name="length2" str="""$str$""" len=<<cnt>>/>
</$list>
\end
Length: <<length "How long am I">>
You can, of course, extend it to possible longer numbers. But it's not very
efficient (it will check every possible length between 1 and 50 even AFTER
it has found the correct length).
Mark
On Wednesday, June 5, 2019 at 6:16:52 PM UTC-7, TonyM wrote:
>
> Bump,
>
> Is there a way to obtain the length of a string?
>
> It appears to be coming in 5.1.20 but before ?
>
> For example if there was a length operator I could do this
> {{{ [length{!!caption}] }}}
>
> Placing it in the size= parameter of edit-text widget would be great.
>
> Regards
> Tony
>
>
> On Thursday, May 30, 2019 at 10:27:29 AM UTC+10, TonyM wrote:
>>
>> Hi,
>>
>> I am using the edit-text widget to edit fields. I am using tag=input and
>> it is possible to set the size of the field in number of characters. The
>> default is 20 (HTML doco)
>>
>> However I would like this size to be set to the length of the value
>> contained in the field, or ideally only if it is greater than already set.
>>
>> Does anyone know how to do this please?
>>
>> Tony
>>
>
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