Auto size shape layer to text

[Andreas243269994s2e]

Can't find this anywhere on the web so please help me out!
I want to create a shape layer (box behind a text layer) that adjusts to the text layer depending on what text I am writing.
But I only want the shape layer to adjust on the width not the height.

I already have the expression/code for a shape layer to adjust to a text layers with its width and height but not one for width only.
Somebody out there who knows?
Would be grateful!

[Mylenium]

If you have the code already, you can simply dial in a fixed value for the second paramater instead of the .height(). not sure what else you need to know.

Mylenium

[Andreas243269994s2e]

Thanks for your reply Mylenium.
The problem is I don't have the right code. This one adjusts both width and height but I just want it to adjust the width.
I cant just erase some letters inside this code I think.
See picture below:

[Mylenium]

You can literally find hundrerds of alternate examples, but here you go:

mLay(this Comp.layer("Text");

mRect=mLay.sourceRectAtTime();

mPadX=20; //padding width

mPadY=20; //padding height

X=mRect.width+mPadX*2;

Y=mRect.height+mPadY*2; //alternatively fixed value: Y=70;

[X,Y]

Mylenium

[Andreas243269994s2e]

Thanks I will try that. So this does not adjust the height only the width?

[Andreas243269994s2e]

I am not good at code/expressions... 
Should this be on position or size?

[Mylenium]

Size:

mLay=thisComp.layer("Text");

mRect=mLay.sourceRectAtTime();

mPadX=20; //padding width

mPadY=20; //padding height

X=mRect.width+mPadX*2;

Y=mRect.height+mPadY*2; //alternatively fixed value: Y=70;

[X,Y]

Position:

mLay=thisComp.layer("Text");

mPos=mLay.transform.position;

mRect=mLay.sourceRectAtTime();

mPadX=20; //padding width

mPadY=20; //padding height

cHalfX=thisComp.width*0.5;

cHalfY=thisComp.height*0.5;

X=mPos[0]-cHalfX+(mRect.width+mPadX*2)*0.5;

Y=mPos[1]-cHalfY+(mRect.height+mPadY*2)*0.5;

[X,Y]

Mylenium

[Andreas243269994s2e]

Ok thanks Mylenium, I'll try that!

[Andreas243269994s2e]

No sorry, the height of the shape layer still changes when I, as an an example, change a "s" to a "S" in my text layer. Have also tried to change the variables in the size code but its still the same...