Improve input validation

[btzr-io]

The current inputs on the toolbar component requires some improvements:

• Validation for current page input
• Validation for current zoom level

[mskuybeda]

May I give it a try?

[btzr-io]

@mskuybeda Sure

[mskuybeda]

A small question though, what do you want to validate in Zoom level? And what inputs need to be validated other than preview?

[btzr-io]

@mskuybeda Right now you can't remove all numbers while typing so its annoying ( there is always a number displayed cant be an empty string ) and is hard to use.

Also we should check for min and max values, currenty the min value in zoom is a dynamic value generated inside the render component, and the max value is "100%",

[btzr-io]

Check the currentPage input on the naviagtion component.

[mskuybeda]

So for zoom, do you want to make a minimum as low as 0% for all images? Or enable user to change it to any value?

[btzr-io]

No the min zoom value is calculated on the render component

[mskuybeda]

Ok. Still not really sure what do you want to change to a current state. Right now as I understand it calculates min zoom value depending on the image. Different images have different min value. What would you like to change about it?

Secondly, I have almost finished preview. Would you like it to appear empty on load or to still have now erasable 0

[btzr-io]

Empty is fine, thanks ✌️

[mskuybeda]

Created a pull request for preview line.

[btzr-io]

All text inputs were removed on v2.0.0, so this issue is not longer relevant