On Jan 18, 4:36 am, Clark Kogan <[email protected]> wrote:
> Hello,
> I was using the following code in an inline jscript function:
>
> tid = story.getTiddler(tidname);
> tidtitle = tid.title;
>
> If I put in a tidname that does not exist, story.getTiddler will still
> return an object.
It should set tid to null if the tiddler doesn't exist.
> However, when I ask for the title (in line 2), it
> gives an error that tid is null. I was wondering how I can
> programatically determine whether I am getting a nonempty tiddler
> before I run line 2.
To test whether a tiddler has been returned before performing the 2nd
line you can use an if statement. Your code would become
var tid = story.getTiddler(tidname);
if(tid) {
tidtitle = tid.title;
}
Alternatively, you can use the tiddlerExists method before retrieving
the tiddler. This can be used by passing it the tiddler name as a
parameter and it with return true or false depending on whether it
exists. E.g.
if(store.tiddlerExists(tidname)) {
var tid = store.getTiddler(tidname);
var tidtitle = tid.title;
}
Hope that helps,
Colm
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