Board clear, new id of objects

[Hron]

Hi, im glad your great work. But I have many questions again.
1)How i can clear board (delete all objects what i create).
2)How i can change id of created object.. as example, i have many
objects on board, i need clear them and create new point with my id
from saved XML:
<points>
<point id="jxgBoard1P27" redactorName="1" x="6" y="6.1" xLaw=""
yLaw="" fillColor="#ff0000" strokeColor="#ff0000" size="3" name=""/>
</points>

board.createElement('point',[6,6.1]).id = jxgBoard1P27.. or something
like that?

[yikes agent]

You may use freeBoard(brd),  where brd is the variable for the board.
You can always create an element and assign it to a variable, there you can manipulate it easily.

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[Hron]

thx, yikes. Board is clear now.

I dont like to spam vars when i only need to create object with saved
id, but when i use:
______________
function loadPoint(pointID,pX,pY,pN) {
var p = board.createElement('point',
[parseFloat(pX),parseFloat(pY)],{name:''+pN});
JXG.getReference(board, p.id).id = pointID;
//JXG.getReference(board, pointID) - there is no object, i didnt
change anything.
}
______________

So i just want to know, how can i change id of object and then work
with him on board by using this id?
Coz if i cant - i need to refrash my xml file and its "big code"
moment))

[Hron]

ofc i will do that on clear board, so i havnt errors with new id, new
id is free always. But what JSXGraph id-system can say about my
manipulations?)

[michael]

Hi,

just add id: 'the id you want to use' in the properties object:

board.create('point', [0, 0], {name: 'A', id: 'Aid'};

And you can use create() instead of createElement. They both do the same, but create() is shorter.

@yikes: When it comes to storing construction in a file you might want to keep track of the ids yourself instead of letting jsxgraph do it to ensure dependencies between the objects are preserved.

michael

[Hron]

Your id-system is fine, but i dont want any troubles and started to
use advice of yikes. So easy and practical solve from michel, thanks
too.

[yikes]

Thanx Michael