I have copied and pasted from Eric's post - and added in some from Jeremy's post, and a few of my own observations. I am sure this is still not perfect.
I hope this formats properly. Google Group's functionality and reliability, and this posting editor must be one of the weakest links in their formidable arsenal! But then who are we to complain too loudly - free is not really free. 1. If the "tiddler" attribute is present: 1a. Get the text of the tiddler, or the value of the "emptyValue" attribute *if the tiddler attribute value or tiddler text field is empty or missing* <$set name="myvar" tiddler="SomeTiddler" emptyValue="sometext"> 1b. If the "subtiddler" attribute is present, get the text of the subtiddler from the specified tiddler, or the value of the "emptyValue" attribute if the tiddler or subtiddler is blank or missing or the subtiddler text field is blank <$set name="myvar" tiddler="SomeTiddler" subtiddler="SomeSubTiddler" emptyValue="sometext"> 1c. If the "field" attribute is present, get the value of that field, or the value of the "emptyValue" attribute if the tiddler or field is blank or missing <$set name="myvar" tiddler="SomeTiddler" field="somefield" emptyValue="sometext"> 1d. If the "index" attribute is present, get the value of the specified index, or the value of the "emptyValue" attribute if the tiddler or index is blank or missing <$set name="myvar" tiddler="SomeTiddler" index="somefield" emptyValue="sometext"> *1e.* If the "tiddler" attribute is present and blank and the filter is present and blank, then return the emptyValue, or blank if there is no emptyValue <$set name="myvar" tiddler="" filter="[somefilter[]]" emptyValue="sometext"> *1f.* If the "tiddler" attribute is present and blank and the filter is present and not blank, then return the entire filter result, & see below for how select behaves with a filter <$set name="myvar" tiddler="" filter="[somefilter[]]"> *1g.* If the "tiddler" attribute is present and blank and the value attribute is present and blank, then return the emptyValue, or blank if there is no emptyValue <$set name="myvar" tiddler="" value="" emptyValue="sometext"> 1h. If the "tiddler" attribute is present and blank and the value attribute is present and not blank, then return the value <$set name="myvar" tiddler="" value="somevalue"> 2. If the "filter" attribute is present and not blank, it is evaluated and: 2a. If there is a non blank filter result, return the entire filter results using double square brackets quoting around any results that include spaces <$set name="myvar" filter="[somefilter[]]"> 2b. If the "value" attribute is present, the filter's result is ignored and the value of the "value" attribute (even if it is blank) is returned. <$set name="myvar" filter="[somefilter[]]" value="somevalue"> 2c. If there is a blank filter result and the "emptyValue" attribute is present, return the value of the "emptyValue" attribute <$set name="myvar" filter="[somefilter[]]" emptyValue="sometext"> 2d. If the "value" attribute and the "emptyValue" attribute are present, if there is a non blank filter result, return the value (*even if it is empty*), or *if the filter result is empty*, return the emptyValue <$set name="myvar" filter="[somefilter[]]" value="somevalue" emptyValue="sometext"> 2e. If both the "filter" attribute and the "select" attribute are present and the "select" attribute is a valid number "N", return the "Nth" result from the filter <$set name="myvar" filter="[somefilter[]]" select="3"> 2f. If both the "filter" attribute and the "select" attribute are present and the "select" attribute is a blank, return the entire filter results <$set name="myvar" filter="[somefilter[]]" select=""> 2g. If both the "filter" attribute and the "select" attribute are present and there is a non blank filter result and the "select" attribute is not a valid number, a blank is returned even if there is an emptyValue <$set name="myvar" filter="[somefilter[]]" select="1000" emptyValue="this won't be returned"> 2h. If both the "filter" attribute and the "select" attribute are present and there is a blank filter result, if there is an emptyValue it is returned, otherwise a blank is returned. <$set name="myvar" filter="[someBadfilter[]]" select="1000" emptyValue="this will be returned"> 3. If neither the "tiddler" or "filter" attributes are provided, return the value of the "value" attribute, or the value of the "emptyValue" attribute if the "value" attribute is blank or missing <$set name="myvar" value="somevalue" emptyValue="sometext"> Note: This does not exactly describe the behaviour: in Jeremy's 2b. > *If the "value" attribute is present and the filter results are empty, > return the value of the "emptyValue" attribute, if present, otherwise > return a blank result* > Testting shows: If there is a value attribute & no emptyValue attribute, the value is returned irrespective of the filter's result. Thanks Jeremy for laying out the sequence and to Eric for providing the actual examples! Note:- It is sometimes difficult to ascertain if the *filter* attribute as used in the *$set* widget is actually empty. It may be that a filter in a *$list* widget shows a given filter as empty, but that does not necessarily mean the same filter used as a value of the *filter* attribute in the *$set* widget will show empty. That is how this topic started off! See the 2nd post in the discussion to see how it was solved. Cheers! -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/ca23f02c-d5b5-4cbc-ae53-1289fa348db8%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
