Answers: Yes. Juvenile diabetes most often is cause by an autoimmune response (the body attacks it's own Beta cells contained by the pancreas that produce insulin).
Asthma in childhood can also be an overactive autoimmune response by the body ,triggered by allergens.
There is a relationship between the two disorders (both can be of autoimmune origin). Having childhood asthma (that is, an improper immune response to an allergen)
can predispose a person to hold a second autoimmune response in the body (as contained by autoimmune Type I diabetes).
So it is a risk factor, but NOT a certainty that if you enjoy juvenile asthma you will also develop juvenile diabetes.
As far as I know, there are no associated risk factor between asthma and diabetes, but they both have hereditarial tendancies. Whether or not you own either, if diabetes runs contained by your family, you are other at risk of developing it, so look after yourself and be sure to have an occassional blood sugar oral exam done with your doctor.