# Slider bar to control \_alpha etc
**URL:** https://forum.kirupa.com/t/slider-bar-to-control--alpha-etc/11728
**Category:** Uncategorized
**Created:** [January 21, 2003, 4:29pm UTC](https://forum.kirupa.com/t/slider-bar-to-control--alpha-etc/11728 "2003-01-21T16:29:20Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@funkyjones](https://forum.kirupa.com/u/funkyjones)
#### Post date: [January 21, 2003, 4:29pm UTC](https://forum.kirupa.com/t/slider-bar-to-control--alpha-etc/11728/1 "2003-01-21T16:29:20Z")
Hi!
Im trying to do a slider bar that can controlls a MC \_alpha value.
I have done a bar that is 100 pixles and the button is in the middle of the bar. And can go +50 x and -50 x.
Please help me out with this one! What code shall i put on the slider?
/mvh ZeusVL
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### Author:  [@system](https://forum.kirupa.com/u/system)
#### Post date: [January 21, 2003, 5:09pm UTC](https://forum.kirupa.com/t/slider-bar-to-control--alpha-etc/11728/2 "2003-01-21T17:09:48Z")
the easiest way to do it is to start the sliderbar at 0 (within the whole ‘slider’ clip) and have it go to 100 since that is your range (alpha between 0 - 100) The problem here is that you might want to flip the way the slider operates, ie one direction is 0 and the other is 100 as opposed to vise versa. To fix that, just set the \_alpha to be based on 100 - the slider position.
Your going based on x (sideways slider) so youd have code like (using startdrag for simplicities sake)
// button in sliderbar
on(press){
startDrag(this,false,0,100,0,0);
}
on(release, releaseOutside){
stopDrag();
}
// sliderbar clip containing slider bar button
onClipEvent(enterFrame){
\_root.whateverClip.\_alpha = 100-\_x;
}
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### Author:  [@system](https://forum.kirupa.com/u/system)
#### Post date: [January 21, 2003, 6:10pm UTC](https://forum.kirupa.com/t/slider-bar-to-control--alpha-etc/11728/3 "2003-01-21T18:10:52Z")
Hey!
Thanks man! It helpt alot!
Thank you!