Use Comp Name to drive position expression

[Dan Ebberts]

Something like this should work:

nameSplit = thisComp.name.split(“_”);
compNum = parseInt(nameSplit[nameSplit.length-1],10);
value – [0,compNum*100]

Dan

[Criis Daw]

thanks for that..

will try it now..

back in a minute when i mess it up ..

cheers

[Criis Daw]

Hi

dont supose you could help me a little more could you .

I copy the expression into the postion property and I understand how the y postion is calculated.

for example comp number 17 in a comp 52 pixels high ends up with a Y value of -2530.

why is that ..?

If I understood how this number is attained I could make it so I get the number I want which is, (comp number-1)*52 . the height od the comp

thanks

[Criis Daw]

ahhh

its ok .

I figured out why it was not what I expected. the expression is applied to the value of the layer .. which I had already set…I works fine if I reset it to zero.

Still If you have 5 minutes to explain a little i would be very thankful.

cheers

Chris

[Dan Ebberts]

The part that converts the comp name to a number? It’s all core JavaScript. The split() function to split the comp name into an array of strings, using “_” as the delimiter. The comp number will be in the last element of the array, which you access with nameSplit[nameSplit.length-1]. Then you use parseInt() to convert the string version of the number to a decimal number.

Dan

[Criis Daw]

thanks..

i understand i a little better.

thanks for your help with this