Bob, a little more
- If you are doing this to develop a unique ID I have done considerable
work on what I call a tiddler Serial number, so do ask.
- The new tiddler process done the correct way, will also increment a
tiddler title if the current title exists.
- It is possible to do this in a field other than text.
- If you want to increment a number from a filter you can use the range
operator as well.
- You could save into and retrieve such a value from a data tiddler as
well.
Regards
Tony
On Thursday, 10 September 2020 17:07:44 UTC+10, TW Tones wrote:
>
> Bob,
>
> I meant to say I live and work in Randwick.
>
> Place this in a new tiddler and click add 1
>
> <$button>
> <$action-setfield $tiddler="$:/config/incremental" text={{{
> [{$:/config/incremental}add[1]] }}}/>
> Add 1
> </$button>
>
> $:/config/incremental {{$:/config/incremental}}
>
> <$set name=currentN value={{$:/config/incremental}}>
>
> currentN=<<currentN>>
>
> </$set>
> This works, ever to initialise the first value
>
> The set demonstrates how to make it a variable.
>
> I advise on keeping code separate from values.
>
> On Thursday, 10 September 2020 16:54:06 UTC+10, Bob Jansen wrote:
>>
>> am I correct in my thinking that I can consider a tiddler like an object
>> in an OO database having data stored in fields and functions stored as
>> macros in the text field?
>>
>> In my case, if I had a tiddler, say $:/tls/unique-id with a field
>> unique_id having a value of 1. I could then write a macro in that tiddler,
>> say increment_unique_id, to increment the field by 1 and use a $list
>> filter to retrieve the new number from any other tiddler that needs the
>> unique value. To increment, all I need to do is call the macro that
>> increments the number in the tiddler $:/tls/unique-id.
>>
>> Am I on the wrong track here?
>>
>> bobj
>>
>> On Thursday, 10 September 2020 at 16:00:18 UTC+10 Bob Jansen wrote:
>>
>>> Tones,
>>>
>>> Thanks for your reply. I am not averse to learning about filters in fact
>>> as I go along I'm getting much better at them.
>>>
>>> I was just frustrated at the poor documentation of how to do simple
>>> concatenation or arithmetic. The examples assume a higher level of
>>> familiarity with the subject than I currently possess. The issue for me is
>>> how to relate my problem to a filter based solution.
>>>
>>> Hopefully your reply as with others will give me greater insight.
>>>
>>> Bobj
>>>
>>> ---------------
>>>
>>> Dr Bob Jansen
>>>
>>> The Cultural Conversations project
>>>
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>>> History
>>>
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>>>
>>> Ph (Korea): +82 10-4494-0328
>>>
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>>>
>>> Resume: http://au.linkedin.com/in/bobjan
>>>
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>>>
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>>>
>>> http://www.cultconv.com
>>>
>>>
>>> In line with the Australian anti-spam legislation, if you wish to receive
>>> no further email from me, please send me an email with the subject "No Spam"
>>>
>>>
>>> On 10 Sep 2020, at 12:19, TW Tones <[email protected]> wrote:
>>>
>>> Bob,
>>>
>>> 1. Is there a simple concatenation operator, like & or + that can be
>>>> used to concatenate strings? I know that a macro can do it but that seems
>>>> very confusing to a simple mind like me.
>>>
>>>
>>> 1. Concatenation
>>>
>>> There are many ways to concatenate with tiddlywiki, although for good
>>> reasons in may seem not as strait forward as you would expect. In part
>>> because where do you want this concatenated result used?
>>> Please provide a descriptive example of what you are currently try to
>>> achieve.
>>>
>>> With concatenation you will find these methods useful
>>>
>>> - Define a macro in which the concatenation occurs
>>> - You can use $(currentTiddler)$ and parameter $param$ for simple
>>> substitutions
>>> - Wiki fy that macro (with the same name is ok) just before you use
>>> it say in a filter and some parameters
>>> - You can use add-prefix/split/join/splitregext and other string
>>> handling.
>>>
>>> 2. Is there a way of doing simple arithmetic, say increment a variable
>>>> or add some variables together? The manual implies that it is possible in
>>>> a
>>>> filter but I want to do it outside of a filter.
>>>
>>>
>>> 2. Most if not all the mathematics functions in standard tiddlywiki are
>>> "filter operators", so they must be used in filters
>>>
>>> However;
>>>
>>> - Use triple braces to present the result of a calculation in line
>>> as a parameter.
>>> {{{ [your maths filter] }}} but you may need to turn the result into
>>> text <$text text={{{ [your maths filter] }}}/>
>>> - You can use other maths plugins like Evans formula plugin he uses
>>> Mushroom brackets (= maths =), calc widget and others
>>>
>>> In closing if you are reluctant to learn filters in more detail, I
>>> suggest you jump in. Filters are so powerful once you come to understand
>>> them your powers are almost unlimited.
>>>
>>> Regards
>>> TW Tones
>>>
>>> On Thursday, 10 September 2020 11:13:06 UTC+10, Bob Jansen wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> bobj
>>>>
>>>> --
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