[TW5] How do I add/remove tags from a tiddler inside a JavaScript plugin?

[Devin Weaver]

I have a plugin that takes a tiddler which has a known tag and I want to remove that tag from the tiddler.

I found out the hard way that tiddler.fields.tags is frozen so I can not filter or slice it.

Is there a function in the core that will remove / add tags to a tiddler?

[Felix Küppers]

Hi Devin,

you need to create a new tiddler based on the old tiddler and also override the "tags" field, also you need to clone the array to work with it using slice. The $tw.Tiddler() constructor accepts tiddler objects as arguments and "hashmaps" so just do the following (off the top of my head):

var copyOfArray = myOldTiddlerWhichIsFrozen.fields.tags.slice(0)

do your array stuff and then:

var fields = {
  tags: myChangedArray
};

var mod = $tw.Tiddler(myOldTiddlerWhichIsFrozen, fields);

then add this tiddler to the store using $tw.wiki.addTiddler(mod)

-Felix

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[Devin Weaver]

Add then Remove. Cool thanks. I though there was something like that.