[not a bug] IsDefined and deleting object

Hi,

If you want to check if a point named "A" exists, you may do the following:

1) Create a point A

2) Create B=Object["A"]

3) Create a variable test = IsDefined[B]

4) Delete A

Cheers,

Mathieu

Thanks it's work, but I think the IsDefined function could be improved.

I tested your code, it worked, but if I try to directly write exist = IsDefined[Object["A"]] there is some bug (I assume that's why you tell me to do t=Object["A"] and then to do existe = IsDefined[t]) :

- The code work without problem (it update when I delete or recreate the point A), but if I save the file and reopen it, the exist variable is set to false, even if the point A is still here, also deleting and recreating the point doesn't update the exist variable.

(I can provide a file of the bug if you can't reproduce it)

That's expected, command is IsDefined[A] not doesExist[A]

What are you trying to do exactly? (I guess you will need to use JavaScript Scripting)

I have a button that test if point are correctly placed. But before that, I want to be sure that the user created all points.

Hi,

As workaround until IsExist[] is realised:

Copy the code below to Global-JavaScript in your application.

Then Save

Then Reopen

Now exist a new Object with name "ExistPointNames"

Instead IsExist[A] you can ask IndexOf["A", ExistPointNames]>0

The code to copy in Global-JavaScript:

(select any object, rightClick, properties, Script, GlobalJavaScript, delete exist script, copy the following)

function ggbOnInit() {

AddDelRen()

ggbApplet.registerAddListener("AddDelRen")

ggbApplet.registerRemoveListener("AddDelRen")

ggbApplet.registerRenameListener("AddDelRen")

}

function AddDelRen(){

swEPN=false

Pnam= []

ip=0

for (i = 0; i < ggbApplet.getObjectNumber(); i++) {

if (""+ggbApplet.getObjectName(i) == "ExistPointNames") {swEPN= true}

if (""+ggbApplet.getObjectType(ggbApplet.getObjectName(i)) == "point") {

Pnam[ip]=""+ggbApplet.getObjectName(i)

ip=ip+1

}

}

if(! swEPN){ggbApplet.evalCommand('ExistPointNames={}')}

PnamS=""+Pnam

PnamStr='{"'+PnamS.replace(/,/g,'","')+'"}'

ggbApplet.evalCommand('SetValue[ExistPointNames, Sort['+PnamStr+']]')

}

Raymond

https://ggbm.at/1714585